subject:"\[Bug 930962\] Re\: dhcp3\-server reports many bad udp checksums to syslog using virtio NIC"

I'd be ok with adding a /usr/share/lxc/hooks/network-bootpc-checksum
script which does the iptables add, and having the debian template add
that to lxc.hook.pre-start.  However, in that hook script we'd want to
avoid having one rule added per container start.  What's the cleanest
and most robust way to detect if the rule has already been inserted?  We
can do a iptables -t mangle -L and look for

CHECKSUM   udp  --  anywhere anywhere udp
dpt:bootpc CHECKSUM fill

but that feels fragile.  Any better ideas?

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Title:
  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

** Changed in: lxc (Ubuntu)
   Status: New = Confirmed

** Changed in: lxc (Ubuntu)
   Importance: Undecided = High

** Changed in: lxc (Ubuntu)
   Status: Confirmed = Incomplete

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-10-30 Thread Robie Basak

16:13 rbasak hallyn_: about bug 930962. I was suggesting doing the mangle the 
other way 
   inside the container. Not sure if that's possible.
16:13 rbasak hallyn_: if not, then iptables -D can delete a rule by its 
specification, 
   so perhaps iptables -D ... || true; iptables -A ... is a 
(hacky) 
   workaround?


** Changed in: lxc (Ubuntu)
   Status: Incomplete = Confirmed

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

 16:13 rbasak hallyn_: if not, then iptables -D can delete a rule by its 
 specification, 
so perhaps iptables -D ... || true; iptables -A ... is a 
 (hacky) 
workaround?

I think I prefer to keep a file like /run/lxc/features/iptables-checksum
to show that it's been done, or just check the iptables -L output.

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

Changing to low priority as there is a workaround.

** Changed in: lxc (Ubuntu)
   Importance: High = Low

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

I'd be ok with adding a /usr/share/lxc/hooks/network-bootpc-checksum
script which does the iptables add, and having the debian template add
that to lxc.hook.pre-start.  However, in that hook script we'd want to
avoid having one rule added per container start.  What's the cleanest
and most robust way to detect if the rule has already been inserted?  We
can do a iptables -t mangle -L and look for

CHECKSUM   udp  --  anywhere anywhere udp
dpt:bootpc CHECKSUM fill

but that feels fragile.  Any better ideas?

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Title:
  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

** Changed in: lxc (Ubuntu)
   Status: New = Confirmed

** Changed in: lxc (Ubuntu)
   Importance: Undecided = High

** Changed in: lxc (Ubuntu)
   Status: Confirmed = Incomplete

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-10-30 Thread Robie Basak

16:13 rbasak hallyn_: about bug 930962. I was suggesting doing the mangle the 
other way 
   inside the container. Not sure if that's possible.
16:13 rbasak hallyn_: if not, then iptables -D can delete a rule by its 
specification, 
   so perhaps iptables -D ... || true; iptables -A ... is a 
(hacky) 
   workaround?


** Changed in: lxc (Ubuntu)
   Status: Incomplete = Confirmed

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

 16:13 rbasak hallyn_: if not, then iptables -D can delete a rule by its 
 specification, 
so perhaps iptables -D ... || true; iptables -A ... is a 
 (hacky) 
workaround?

I think I prefer to keep a file like /run/lxc/features/iptables-checksum
to show that it's been done, or just check the iptables -L output.

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Title:
  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

Changing to low priority as there is a workaround.

** Changed in: lxc (Ubuntu)
   Importance: High = Low

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-10-24 Thread Robie Basak

This issue also affects the debian LXC template in Ubuntu (lxc
1.0.0~alpha1-0ubuntu11). If I create a Debian jessie container on Ubuntu
Saucy, then the container cannot DHCP.

Workaround: sudo iptables -t mangle -A POSTROUTING -o lxcbr0 -p udp
--dport bootpc -j CHECKSUM --checksum-fill

It looks like the Debian bug is http://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=717217

Is there any way a workaround could be applied to lxc in Ubuntu -
perhaps something specific to the Debian template? I wonder if the
template could arrange for an iptables inside the container to mangle
the incoming DHCP packet or something.

** Also affects: lxc (Ubuntu)
   Importance: Undecided
   Status: New

** Bug watch added: Debian Bug tracker #717217
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717217

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-10-24 Thread Robie Basak

This issue also affects the debian LXC template in Ubuntu (lxc
1.0.0~alpha1-0ubuntu11). If I create a Debian jessie container on Ubuntu
Saucy, then the container cannot DHCP.

Workaround: sudo iptables -t mangle -A POSTROUTING -o lxcbr0 -p udp
--dport bootpc -j CHECKSUM --checksum-fill

It looks like the Debian bug is http://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=717217

Is there any way a workaround could be applied to lxc in Ubuntu -
perhaps something specific to the Debian template? I wonder if the
template could arrange for an iptables inside the container to mangle
the incoming DHCP packet or something.

** Also affects: lxc (Ubuntu)
   Importance: Undecided
   Status: New

** Bug watch added: Debian Bug tracker #717217
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717217

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-06-01 Thread Bart Heinsius

new package was in precise-proposed this morning, it fixed the problem.

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-06-01 Thread Bart Heinsius

new package was in precise-proposed this morning, it fixed the problem.

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

This bug was fixed in the package dhcp3 - 3.1.3-2ubuntu3.5

---
dhcp3 (3.1.3-2ubuntu3.5) lucid-proposed; urgency=low

  * Include patch from RedHat/Fedora to deal with hardware/xen/virtio offload
of UDP checksums. (LP: #930962)
  * Update apparmor profile to add required the network packet raw rule
for the checksum change.
 -- Stephane Graber stgra...@ubuntu.com   Thu, 23 May 2013 19:58:28 -0400

** Changed in: dhcp3 (Ubuntu Lucid)
   Status: Fix Committed = Fix Released

** Changed in: isc-dhcp (Ubuntu Precise)
   Status: Fix Committed = Fix Released

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

This bug was fixed in the package isc-dhcp - 4.1.ESV-R4-0ubuntu5.8

---
isc-dhcp (4.1.ESV-R4-0ubuntu5.8) precise-proposed; urgency=low

  [ Dave Chiluk ]
  * Allow dhcpd to read /etc/ldap/ldap.conf for isc-dhcp-server-ldap.
(LP: #1057358). Backported from Stéphane Graber's quantal patch.

  [ Stéphane Graber ]
  * Include patch from RedHat/Fedora to deal with hardware/xen/virtio offload
of UDP checksums. (LP: #930962)
  * Update apparmor profile to add required the network packet raw rule
for the checksum change.
 -- Stephane Graber stgra...@ubuntu.com   Thu, 23 May 2013 11:13:07 -0400

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Title:
  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

This bug was fixed in the package dhcp3 - 3.1.3-2ubuntu3.5

---
dhcp3 (3.1.3-2ubuntu3.5) lucid-proposed; urgency=low

  * Include patch from RedHat/Fedora to deal with hardware/xen/virtio offload
of UDP checksums. (LP: #930962)
  * Update apparmor profile to add required the network packet raw rule
for the checksum change.
 -- Stephane Graber stgra...@ubuntu.com   Thu, 23 May 2013 19:58:28 -0400

** Changed in: dhcp3 (Ubuntu Lucid)
   Status: Fix Committed = Fix Released

** Changed in: isc-dhcp (Ubuntu Precise)
   Status: Fix Committed = Fix Released

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

This bug was fixed in the package isc-dhcp - 4.1.ESV-R4-0ubuntu5.8

---
isc-dhcp (4.1.ESV-R4-0ubuntu5.8) precise-proposed; urgency=low

  [ Dave Chiluk ]
  * Allow dhcpd to read /etc/ldap/ldap.conf for isc-dhcp-server-ldap.
(LP: #1057358). Backported from Stéphane Graber's quantal patch.

  [ Stéphane Graber ]
  * Include patch from RedHat/Fedora to deal with hardware/xen/virtio offload
of UDP checksums. (LP: #930962)
  * Update apparmor profile to add required the network packet raw rule
for the checksum change.
 -- Stephane Graber stgra...@ubuntu.com   Thu, 23 May 2013 11:13:07 -0400

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-24 Thread Colin Watson

Works well for me too with a lucid LXC container on saucy.  Thanks!

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-24 Thread Colin Watson

Works well for me too with a lucid LXC container on saucy.  Thanks!

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

Recent kernel changes are now causing this issue to appear in LXC containers 
too where the libvirt mangle rule doesn't help at all.
As a result I'm now preparing SRUs for both lucid and precise so that all 
supported Ubuntu versions know to deal with missing checksums.

** Also affects: isc-dhcp (Ubuntu Precise)
   Importance: Undecided
   Status: New

** Also affects: isc-dhcp (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** Changed in: isc-dhcp (Ubuntu Lucid)
   Status: New = Triaged

** Changed in: isc-dhcp (Ubuntu Precise)
   Status: New = Triaged

** No longer affects: isc-dhcp (Ubuntu Lucid)

** Also affects: dhcp3 (Ubuntu)
   Importance: Undecided
   Status: New

** No longer affects: dhcp3 (Ubuntu Precise)

** No longer affects: dhcp3 (Ubuntu Quantal)

** Also affects: dhcp3 (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** Also affects: isc-dhcp (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** No longer affects: isc-dhcp (Ubuntu Lucid)

** Changed in: dhcp3 (Ubuntu)
   Status: New = Fix Released

** Changed in: dhcp3 (Ubuntu Lucid)
   Status: New = Triaged

** Changed in: dhcp3 (Ubuntu Lucid)
 Assignee: (unassigned) = Stéphane Graber (stgraber)

** Changed in: isc-dhcp (Ubuntu)
 Assignee: Stéphane Graber (stgraber) = (unassigned)

** Changed in: dhcp3 (Ubuntu Lucid)
   Importance: Undecided = High

** Changed in: isc-dhcp (Ubuntu Precise)
   Importance: Undecided = High

** Changed in: isc-dhcp (Ubuntu Precise)
 Assignee: (unassigned) = Stéphane Graber (stgraber)

** Changed in: isc-dhcp (Ubuntu Quantal)
 Assignee: Stéphane Graber (stgraber) = (unassigned)

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

** Changed in: isc-dhcp (Ubuntu Precise)
   Status: Triaged = In Progress

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

** Changed in: dhcp3 (Ubuntu Lucid)
   Status: Triaged = In Progress

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-23 Thread Adam Conrad

Hello Tim, or anyone else affected,

Accepted isc-dhcp into precise-proposed. The package will build now and
be available at http://launchpad.net/ubuntu/+source/isc-
dhcp/4.1.ESV-R4-0ubuntu5.8 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: isc-dhcp (Ubuntu Precise)
   Status: In Progress = Fix Committed

** Tags removed: verification-done

** Tags added: verification-needed

** Changed in: dhcp3 (Ubuntu Lucid)
   Status: In Progress = Fix Committed

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Title:
  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-23 Thread Launchpad Bug Tracker

** Branch linked: lp:ubuntu/lucid-proposed/dhcp3

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

Tested in a precise LXC container running on saucy and confirmed that
this fixes the issue there.

** Tags added: verification-done-precise

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-23 Thread William Grant

Tested in a lucid LXC container on saucy, also fixes the bug.

** Tags removed: verification-needed
** Tags added: verification-done verification-done-lucid

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

Recent kernel changes are now causing this issue to appear in LXC containers 
too where the libvirt mangle rule doesn't help at all.
As a result I'm now preparing SRUs for both lucid and precise so that all 
supported Ubuntu versions know to deal with missing checksums.

** Also affects: isc-dhcp (Ubuntu Precise)
   Importance: Undecided
   Status: New

** Also affects: isc-dhcp (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** Changed in: isc-dhcp (Ubuntu Lucid)
   Status: New = Triaged

** Changed in: isc-dhcp (Ubuntu Precise)
   Status: New = Triaged

** No longer affects: isc-dhcp (Ubuntu Lucid)

** Also affects: dhcp3 (Ubuntu)
   Importance: Undecided
   Status: New

** No longer affects: dhcp3 (Ubuntu Precise)

** No longer affects: dhcp3 (Ubuntu Quantal)

** Also affects: dhcp3 (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** Also affects: isc-dhcp (Ubuntu Lucid)
   Importance: Undecided
   Status: New

** No longer affects: isc-dhcp (Ubuntu Lucid)

** Changed in: dhcp3 (Ubuntu)
   Status: New = Fix Released

** Changed in: dhcp3 (Ubuntu Lucid)
   Status: New = Triaged

** Changed in: dhcp3 (Ubuntu Lucid)
 Assignee: (unassigned) = Stéphane Graber (stgraber)

** Changed in: isc-dhcp (Ubuntu)
 Assignee: Stéphane Graber (stgraber) = (unassigned)

** Changed in: dhcp3 (Ubuntu Lucid)
   Importance: Undecided = High

** Changed in: isc-dhcp (Ubuntu Precise)
   Importance: Undecided = High

** Changed in: isc-dhcp (Ubuntu Precise)
 Assignee: (unassigned) = Stéphane Graber (stgraber)

** Changed in: isc-dhcp (Ubuntu Quantal)
 Assignee: Stéphane Graber (stgraber) = (unassigned)

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

** Changed in: isc-dhcp (Ubuntu Precise)
   Status: Triaged = In Progress

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

** Changed in: dhcp3 (Ubuntu Lucid)
   Status: Triaged = In Progress

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-23 Thread Adam Conrad

Hello Tim, or anyone else affected,

Accepted isc-dhcp into precise-proposed. The package will build now and
be available at http://launchpad.net/ubuntu/+source/isc-
dhcp/4.1.ESV-R4-0ubuntu5.8 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: isc-dhcp (Ubuntu Precise)
   Status: In Progress = Fix Committed

** Tags removed: verification-done

** Tags added: verification-needed

** Changed in: dhcp3 (Ubuntu Lucid)
   Status: In Progress = Fix Committed

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-23 Thread Launchpad Bug Tracker

** Branch linked: lp:ubuntu/lucid-proposed/dhcp3

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

Tested in a precise LXC container running on saucy and confirmed that
this fixes the issue there.

** Tags added: verification-done-precise

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-23 Thread William Grant

Tested in a lucid LXC container on saucy, also fixes the bug.

** Tags removed: verification-needed
** Tags added: verification-done verification-done-lucid

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-05-21 Thread Jon Schewe

Any plans to get this fix into 12.04 LTS? Or can I run the new packages
inside LTS?

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-04-22 Thread Launchpad Bug Tracker

This bug was fixed in the package isc-dhcp - 4.2.4-1ubuntu10.2

---
isc-dhcp (4.2.4-1ubuntu10.2) quantal-proposed; urgency=low

  * Fix isc-dhcp-server-ldap not actually containing ldap support.
Thanks to Christian Hoffmann for tracking down the issue. (LP: #1071928)
  * Don't set fqdn.fqdn in dhclient.conf as that seems to confuse some DHCP
servers. An alternative would have been to only set fqdn.fqdn and not
host-name, but that appears to confuse another set of servers.
For now go with just host-name which is the most common and if becomes a
big problem for IPv6 (where fqdn.fqdn is apparently required), then we'll
need to have a separate dhclient6.conf file and change all the calls to
dhclient -6 to use that file instead. (LP: #1088682)
  * Include patch from RedHat/Fedora to deal with hardware/xen/virtio offload
of UDP checksums. (LP: #930962)
 -- Stephane Graber stgra...@ubuntu.com   Fri, 01 Mar 2013 16:07:49 -0500

** Changed in: isc-dhcp (Ubuntu Quantal)
   Status: Fix Committed = Fix Released

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-04-19 Thread Stéphane Graber

** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-04-08 Thread Tim Miller Dyck

Hi Dave, thanks for uploading that.

I have upgraded the DHCP server system to Quantal:

# dpkg -l | grep dhcp
ii  isc-dhcp-client  4.2.4-1ubuntu10.1amd64
ISC DHCP client
ii  isc-dhcp-common  4.2.4-1ubuntu10.1amd64
common files used by all the isc-dhcp* packages
ii  isc-dhcp-server  4.2.4-1ubuntu10.1amd64
ISC DHCP server for automatic IP address assignment

I switched the NIC type to virtio and confirmed the problem still
exists.

I then installed the updated packages from quantal-proposed:

# aptitude install isc-dhcp-server/quantal-proposed isc-dhcp-client
/quantal-proposed isc-dhcp-common/quantal-proposed

Confirming new versions:

# dpkg -l | grep dhcp
ii  isc-dhcp-client  4.2.4-1ubuntu10.2amd64
ISC DHCP client
ii  isc-dhcp-common  4.2.4-1ubuntu10.2amd64
common files used by all the isc-dhcp* packages
ii  isc-dhcp-server  4.2.4-1ubuntu10.2amd64
ISC DHCP server for automatic IP address assignment

The DHCP server log warnings do not appear any longer and DHCP is
working as usual.

So, it looks fixed to me.

Thanks!
Tim Miller Dyck

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-04-06 Thread Markus Heberling

The http://launchpad.net/ubuntu/+source/isc-dhcp/4.2.4-1ubuntu10.2
package fixes this for me on quantal.

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-03-27 Thread Dave Walker

Hello Tim, or anyone else affected,

Accepted isc-dhcp into quantal-proposed. The package will build now and
be available at http://launchpad.net/ubuntu/+source/isc-
dhcp/4.2.4-1ubuntu10.2 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: isc-dhcp (Ubuntu Quantal)
   Status: In Progress = Fix Committed

** Tags added: verification-needed

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-03-01 Thread Stéphane Graber

** Also affects: isc-dhcp (Ubuntu Quantal)
   Importance: Undecided
   Status: New

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-03-01 Thread Stéphane Graber

** Changed in: isc-dhcp (Ubuntu Quantal)
Status: New = In Progress

** Changed in: isc-dhcp (Ubuntu Quantal)
Assignee: (unassigned) = Stéphane Graber (stgraber)

** Description changed:

- Tested with dhcp3-server ver. 3.1.3-2ubuntu3.3 in Ubuntu 10.04.3
- Server, x64.
+ == Rationale ==
+ Machines using virtio (kvm/xen) and running a dhcp server in a VM won't
receive the proper udp checksums which leads to dhcpd dropping the packets.
+ This patch forces the checksum to be calculated in such case.
+
+ == Test case ==
+ 1) Install a dhcp server in a VM using kvm/xen
+ 2) Make sure you don't have iptables re-calculating the checksums for you
+ 3) Check that the requests go through as expected
+
+ == Regression potential ==
+ Raring has had that fix for a while, so does redhat, so it looks pretty safe
to me.
+
+
+ --- original bug report ---
+ Tested with dhcp3-server ver. 3.1.3-2ubuntu3.3 in Ubuntu 10.04.3 Server,
x64.

The DHCP server reports that UDP packets sent to it have bad checksums:

Feb 11 06:57:18 ... dhcpd: 5 bad udp checksums in 5 packets
Feb 11 06:58:22 ... dhcpd: last message repeated 7 times
Feb 11 06:59:17 ... dhcpd: last message repeated 7 times

The DHCP server host is a KVM virtual machine using a virtio-based
virtual NIC.

This problem has been reported for other distros using KVM and virtio:

https://bugs.mageia.org/show_bug.cgi?id=1243

http://www.mail-archive.com/kvm@vger.kernel.org/msg41958.html
- - suggests using iptables to write in a checksum
+ - suggests using iptables to write in a checksum

http://pkgs.fedoraproject.org/gitweb/?p=dhcp.git;a=blob;f=dhcp-4.2.2-xen-checksum.patch;h=038d346d726e131f1ab2579fe015a72b49733a0d;hb=HEAD
- - Fedora patch to dhcp to avoid this
+ - Fedora patch to dhcp to avoid this

The simplest workaround is to change the virtual NIC type from virtio to
Intel e1000 in KVM. Apparently this driver calculates checksums. But
virtio is the default driver type.

Thanks,
Tim Miller Dyck

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-01-17 Thread Stéphane Graber

The next isc-dhcp upload will contain the RedHat patch for hardware/xen/virtio 
offloading.
Upstream was contacted through Debian but without any response yet.

** Changed in: isc-dhcp (Ubuntu)
   Status: Confirmed = Fix Committed

** Changed in: isc-dhcp (Ubuntu)
 Assignee: Stefan Bader (stefan-bader-canonical) = Stéphane Graber 
(stgraber)

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-01-17 Thread Launchpad Bug Tracker

This bug was fixed in the package isc-dhcp - 4.2.4-4ubuntu1

---
isc-dhcp (4.2.4-4ubuntu1) raring; urgency=low

  * Merge from Debian, remaining changes:
- Apparmor profiles for dhclient and dhcpd.
- Upstart jobs for isc-dhcp-server, isc-dhcp-server6, isc-dhcp-relay and
  isc-dhcp-relay6. (LP: #944849)
- Separate default file for isc-dhcp-relay6. (LP: #944849)
- Apport hook for isc-dhcp-client and isc-dhcp-server.
- dhclient.conf: Set for IPv6 (dhcp6.*) (LP: #770324)
- If /etc/ltsp/dhcpd.conf exists, use that instead of /etc/dhcp/dhcpd.conf
- Drop isc-dhcp-server/new_auth_behavior question from high to medium
- Create user/group dhcpd (LP: #727837)
- Create /etc/dhcp/ddns-keys/ for DDNS updates (LP: #341817)
- Build with extra hardening and use --enable-paranoia to run dhcpd as user
  (LP: #727837)
- Add IPv6 support to dhclient-script.linux.udeb
- Wait for /etc/resolv.conf to be writable in dhclient-script.linux.
  (LP: #856984)
- Sanitize environment in dhclient-script.linux. (LP: #1045986)
- Don't call 'ip addr flush' as it breaks IPv6 networking. (LP: #1023174)
- debian/apparmor-profile.dhclient: update to add the new paths used by
  NetworkManager for its conf and leases files; standardized under
  /var/lib/NetworkManager.
- Remaining Ubuntu patches:
  + dhclient-fix-backoff
  + dhclient-more-debug (LP: #35265)
  + dhclient-safer-timeout (LP: #838968)
  + dhcpd.conf-subnet-examples (LP: #26661)
  + multi-ip-addr-per-if (LP: #717166)
  + onetry_retry_after_initial_success (LP: #974284)
  + revert-next-server
- Dropped Ubuntu patches:
  + dhclient-onetry-call-clientscript (now in Debian)
  * Fix isc-dhcp-server-ldap not actually containing ldap support.
Thanks to Christian Hoffmann for tracking down the issue. (LP: #1071928)
  * Don't set fqdn.fqdn in dhclient.conf as that seems to confuse some DHCP
servers. An alternative would have been to only set fqdn.fqdn and not
host-name, but that appears to confuse another set of servers.
For now go with just host-name which is the most common and if becomes a
big problem for IPv6 (where fqdn.fqdn is apparently required), then we'll
need to have a separate dhclient6.conf file and change all the calls to
dhclient -6 to use that file instead. (LP: #1088682)
  * Include patch from RedHat/Fedora to deal with hardware/xen/virtio offload
of UDP checksums. (LP: #930962)

isc-dhcp (4.2.4-4) unstable; urgency=medium

  * Run exit hooks when dhclient -1 fails (closes: #486520).
  * Add dhcp6.name-servers and dhcp6.domain-search to the default request
options in dhclient.conf (closes: #693315).
 -- Stephane Graber stgra...@ubuntu.com   Thu, 17 Jan 2013 17:09:14 -0500

** Changed in: isc-dhcp (Ubuntu)
   Status: Fix Committed = Fix Released

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-01-08 Thread Michal Suchanek

On 7 January 2013 23:13, Martijn Lievaart 930...@bugs.launchpad.net wrote:
 According to my cursory reading of relevant RFCs and a quick wireshark
 session, the bug is in KVM virtio. An UDP packet should contain a
 checksum field of 0 for no checksum, or a correct checksum. I see bogus
 values coming in.

 OTOH, wireshark warns that this may be due to offloading, so I may not
 be correct in this analysis.


This is due to virtio implementing 'offloading' by returning random
garbage in the checksum field.

Since the code to calculate the checksumis not present this offloading
cannot be turned off.

Since kernel has interface to inform applications that offloading is
on it is a bug in the application to interpret the bogus checksum.
Presumably the card has already checked it and did not bother passing
it on.

This same feature is available on real e1000 hardware and can be
turned off there.

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Title:
  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-01-08 Thread Martijn Lievaart

 On 7 January 2013 23:13, Martijn Lievaart 930...@bugs.launchpad.net wrote:
 According to my cursory reading of relevant RFCs and a quick wireshark
 session, the bug is in KVM virtio. An UDP packet should contain a
 checksum field of 0 for no checksum, or a correct checksum. I see bogus
 values coming in.

 OTOH, wireshark warns that this may be due to offloading, so I may not
 be correct in this analysis.

 This is due to virtio implementing 'offloading' by returning random
 garbage in the checksum field.

 Since the code to calculate the checksumis not present this offloading
 cannot be turned off.

 Since kernel has interface to inform applications that offloading is
 on it is a bug in the application to interpret the bogus checksum.
 Presumably the card has already checked it and did not bother passing
 it on.

Hi Michal,

I don't quite understand what you are saying here. Are you saying that
because Linux has a kernel interface to check for offloading, any and
all application (that cares about udp checksums) should use this? It
would seem much simpler if the virtio driver zero'd the checksum field,
any application already should be able to handle that. No Linux specific
code needed.

Martijn

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2013-01-08 Thread Michal Suchanek

Hello,

On 8 January 2013 15:01, Martijn Lievaart 930...@bugs.launchpad.net
wrote:

 Hi Michal,

 I don't quite understand what you are saying here. Are you saying that
 because Linux has a kernel interface to check for offloading, any and
 all application (that cares about udp checksums) should use this? It

Yes, reading several discussion about this issue it seems that
application that wants to work correctly on Linux has to do this. This
issue pops up on actual hardware with actual hardware checksum
offloading reportedly.

 would seem much simpler if the virtio driver zero'd the checksum field,
 any application already should be able to handle that. No Linux specific
 code needed.

Except virtio would have to do the work then. Also it does not solve
the issue for other hardware with offloading.

Also does the zero checksum not change the meaning of the message? It
would seem that setting the checksum to zero in driver and application
ignoring the offload status would imply interpretation that the sender
did not include any checksum at all whereas the correct interpretation
would be that the checksum was verified and stripped by network
hardware.

Thanks

Michal

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

This workaround on bridged clients seems to make dhcpd happy

sudo iptables -A POSTROUTING -t mangle -p udp --dport 67 -j CHECKSUM
--checksum-fill

(Luckily I only need it on my Icinga to check dhcp, all clients have
fixed IPs)

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

Note that the analog workaround on the server running dhcpd does not
work. I assume the raw socket used by dhcpd is read before PREROUTING is
hit. That makes this bug ugly, as the workaround must be done on *all*
clients instead of only the server.

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

According to my cursory reading of relevant RFCs and a quick wireshark
session, the bug is in KVM virtio. An UDP packet should contain a
checksum field of 0 for no checksum, or a correct checksum. I see bogus
values coming in.

OTOH, wireshark warns that this may be due to offloading, so I may not
be correct in this analysis.

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  dhcp3-server reports many bad udp checksums to syslog using virtio NIC

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

As mentioned in the first comment, switching to e1000 NIC on the dhcpd
server also fixed the issue.

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2012-10-30 Thread Peter Matulis

This workaround succeeded for me (on my KVM hypervisor):

sudo iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM
--checksum-fill

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2012-08-10 Thread Michal Suchanek

No, I am using some other manually installed workaround, and I am
using bare dnsmasq and dhcp client, not network manager nor libvirt.

Did not get to figuring out what the workaround was yet.

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2012-08-10 Thread Stefan Bader

 Did not get to figuring out what the workaround was yet.

See the comment before your comment. :) Well, probably not that simple when
using the mail interface as ordering differs there. But in the report itself.

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2012-08-09 Thread Michal Suchanek

On 8 August 2012 18:35, Stefan Bader stefan.ba...@canonical.com wrote:
 Finally got some time to look into this. As much as my test reproduction
 of this goes it would be not critical in importance because clients seem
 to get an IP address even with those messages showing up.

That's not what I see here, they do not get an IP address.


 I can see those bad crc messages in (Quantal, Precise and Lucid those
 just been the ones I set up to try). To summarize my understanding here:

 - virtio (and xen netfron) would deliberately leave the checksum incomplete 
 for
packets between interfaces on the same host because the packet will always
   remain in memory. So calculating a checksum is a waste of time.

No, that's how any network card with checksum offloading behaves. It
may skip copying the checksum because it verified it already, and the
virtio device abuses this interface quirk to never produce any
checksum in the first place. On real network interfaces you can turn
that feature off, and then the checksum is always copied. On virtio
'turning off' would amount to producing a checksum which dhclient can
subsequently check.

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

On 09.08.2012 10:21, Michal Suchanek wrote:
 of this goes it would be not critical in importance because clients seem
 to get an IP address even with those messages showing up.
 
 That's not what I see here, they do not get an IP address.

Then what is your exact setup?

 - virtio (and xen netfron) would deliberately leave the checksum incomplete 
 for
packets between interfaces on the same host because the packet will always
   remain in memory. So calculating a checksum is a waste of time.
 
 No, that's how any network card with checksum offloading behaves. It
 may skip copying the checksum because it verified it already, and the
 virtio device abuses this interface quirk to never produce any
 checksum in the first place. On real network interfaces you can turn
 that feature off, and then the checksum is always copied. On virtio
 'turning off' would amount to producing a checksum which dhclient can
 subsequently check.

Yes, it a real card has checksum offloading it would do this in hardware. What I
try to say is that the fact that virtio leaves them incomplete when passed
within the virtual network looks like a deliberate decision there for
performance improvement. And since upstream has added that interface to check
for those incomplete checksums (and specifically mentioning dhcp) makes it clear
that the drivers will not change.

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

2012-08-09 Thread Michal Suchanek

On 9 August 2012 10:49, Stefan Bader stefan.ba...@canonical.com wrote:
 On 09.08.2012 10:21, Michal Suchanek wrote:
 of this goes it would be not critical in importance because clients seem
 to get an IP address even with those messages showing up.

 That's not what I see here, they do not get an IP address.

 Then what is your exact setup?

dnsmasq running on xen dom0 and xen dumUs trying to get IP address
with dhcp client.

I see server mentioned here so maybe on server the checksum error is
not considered fatal.

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

I added Quantal and Precise version of the isc-dhcp packages to
http://people.canonical.com/~smb/lp930962/ for some broader testing. Are
those also fixing the issues where no IP addresses were assigned?

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Re: [Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC

On 09.08.2012 11:17, Michal Suchanek wrote:

 Then what is your exact setup?
 
 dnsmasq running on xen dom0 and xen dumUs trying to get IP address
 with dhcp client.

Ah ok, I was using the isc-dhcp-server on a KVM guest to isc-dhcp-clinet on
another one.

But thought I also had been using the dnsmasq setup created by libvirt for Xen
dom0 to domU. Hm, wait, I may have seen something somewhere in all those links
and reports that mentioned libvirt having a quirk for that. Are you using
dnsmasq on your own or have libvirt in use?

(If libvirt does something it probably is the ipfilter based approach that is
mentioned in a few placec)
 
 I see server mentioned here so maybe on server the checksum error is
 not considered fatal.

The handling should be the same on server or on desktop. But then, maybe network
manager is doing something when it sees the checksum errors. That would not be
happening on server.

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[Bug 930962] Re: dhcp3-server reports many bad udp checksums to syslog using virtio NIC