[Bug 1937110] Re: dhcp option 121 & 249
** Also affects: busybox (Ubuntu Jammy) Importance: Undecided Status: New ** Changed in: busybox (Ubuntu Jammy) Importance: Undecided => High ** Changed in: busybox (Ubuntu Jammy) Status: New => Confirmed ** Changed in: busybox (Ubuntu Jammy) Milestone: None => ubuntu-22.04.1 ** Tags removed: rls-kk-incoming -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937110 Title: dhcp option 121 & 249 To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1937110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1937110] Re: dhcp option 121 & 249
** Changed in: busybox (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937110 Title: dhcp option 121 & 249 To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1937110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1937110] Re: dhcp option 121 & 249
** Tags added: fr-2416 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937110 Title: dhcp option 121 & 249 To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1937110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1937110] Re: dhcp option 121 & 249
I'll also add that installers for past LTS Ubuntu releases do work in our environment. I opened up the Focal initrd.gz we use for PXE based installs (I think it was from the mini.iso which I guess is now classified as a "Legacy Image", http://archive.ubuntu.com/ubuntu/dists/focal/main/installer- amd64/current/legacy-images/netboot/mini.iso). What I found is that it also is missing /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes HOWEVER it has an older /sbin/dhclient-script that does NOT have the code that ignores "routers" option values when the RFC 3442 option 121 is present in the response. As a result it does configure the default route based on the DHCP "routers" value but ignores the RFC 3442 info. In our environment this means the routing is sub-optimal but networking still largely functions and thus Focal installation "works". The original poster reports trouble with Focal installer I don't know if the difference is because they use a different Focal .iso or because perhaps they strongly require the RFC 3442 routes for networking to function in their environment. My recollection regarding the changes in the newer dhclient-script is that it that ignoring the "routers" option if the client supports and uses the RFC 3442 routes option is the behavior specified in RFC 3442, that the behavior of the old version to sort-of merge the "routers" option and the RFC 3442 option 121 together was non-compliant. Though as it turns out if the "rfc3442-classless-routes" hook file is accidentally missing then that makes the behavior of the newer, more correct dhclient-script version worse. --Matt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937110 Title: dhcp option 121 & 249 To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1937110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1937110] Re: dhcp option 121 & 249
The Ubuntu Jammy installer initrd is missing the /etc/dhcp/dhclient-
exit-hooks.d/rfc3442-classless-routes hook for dhclient. The
/sbin/dhclient-script included in the initrd assumes the hook is present
and if the "rfc3442_classless_static_routes" DHCP is sent by the DHCP
server it ignores the the "routers" DHCP option and defers to the
rfc3442 hook to setup the routing ...except that hook is missing so
ultimately no routing is configured if the rfc3442 option 121
("classless-static-routes" w/ ISC dhcpd) exists in the DHCP response.
This means networking doesn't function and we cannot install Ubuntu.
My colleague tested modifying the initrd by adding the
/etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes file and
reports that works.
--Matt
# from the initrd rescue shell
(initramfs) ls /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes
ls: cannot access /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes: No
such file or directory
# showing that the "routers" option is ignored if rfc3442 info is sent
(initramfs) grep -C1 classless /sbin/dhclient-script
# if we have $new_rfc3442_classless_static_routes then we have to
# ignore $new_routers entirely
if [ ! "$new_rfc3442_classless_static_routes" ]; then
# set if_metric if IF_METRIC is set or there's more than
one router
--
if [ -z "$new_routers" ] || ping -q -c 1 "${new_routers%% *}"; then
# if we have $new_rfc3442_classless_static_routes then we have to
# ignore $new_routers entirely
if [ ! "$new_rfc3442_classless_static_routes" ]; then
if [ -n "$alias_ip_address" ] &&
--
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https://bugs.launchpad.net/bugs/1937110
Title:
dhcp option 121 & 249
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[Bug 1937110] Re: dhcp option 121 & 249
Funny thing is that the rfc 3442 is from 2002. Thats what makes me wonder of the missing support till today... My workarround till today is to unzip the iso -> kernel+initrd, patch the initrd, and use the patched initrd. I would not recommend anyone to do it like that, only if theres no other options.. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937110 Title: dhcp option 121 & 249 To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1937110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1937110] Re: dhcp option 121 & 249
** Tags added: rls-kk-incoming -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937110 Title: dhcp option 121 & 249 To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1937110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1937110] Re: dhcp option 121 & 249
I just wanted to say that we are also hitting the same problem (lack of dhcp option 121/249). So Subiquity connects to the network, but can't get a default route and thus fails. Couple this with the removal of debian-installer support from Ubuntu, and we can no longer install Ubuntu Jammy LTS. This is a showstopper bug for us. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937110 Title: dhcp option 121 & 249 To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1937110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1937110] Re: dhcp option 121 & 249
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: busybox (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937110 Title: dhcp option 121 & 249 To manage notifications about this bug go to: https://bugs.launchpad.net/subiquity/+bug/1937110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
