Has anyone seen the following problem, is there a fix?
I am setting up an HA system on CentOS were a single eth0 interface will
be trunked to
multiple VLANs by setting up eth0.<vlan-number>, and on top of these I
will use the HA
software to add/removed IP's (eth0.<vlan-number>:<alias>). Everything
works fine until
I need to remove the first alias IP set up on the interface ... removing
this removes
the other entries as well!
I see the same problem whether I use 'ifconfig' or 'ip'. Here is simple
scenario using
'ifconfig' :-
* Add three IP's to VLAN 666 :-
# ifconfig eth0.666:0 AAA.AAA.AAA.164 netmask 255.255.252.0 up
# ifconfig eth0.666:1 AAA.AAA.AAA.163 netmask 255.255.252.0 up
# ifconfig eth0.666:2 AAA.AAA.AAA.162 netmask 255.255.252.0 up
* If I remove eth0.666:1 and/or eth0.666:2, E.G. :-
# ifconfig eth0.666:1 down
then all is well, the other aliases remain as expected.
* HOWEVER, if I remove eth0.666:0 :-
# ifconfig eth0.666:0 down
then eth0.666:1 and eth0.666:2 ARE ALSO REMOVED!
[I do not believe this is the same problem as in the FAQ, "Every time my
machine releases
an IP alias, it loses the whole interface (i.e. eth0)! How do I fix
this?" ...
I have the most recent version of CentOS I can 'yum update' and
adding/removing
aliases defined as eth0:N (no vlan) works perfectly. Apologies if I
need an even more
recent version of net-tools.]
The same thing happens if I start at :1 rather than :0 - removing the
first alias (:1)
removes the others.
I can not fix the problem by adding a 'dummy' IP from another network
range as the first
alias so that I never need to remove the first alias (not that I
actually wanted to do this,
it was just a test). E.G. :-
# ifconfig eth0.666:0 192.168.1.1 netmask 255.255.252.0 up
# ifconfig eth0.666:1 AAA.AAA.AAA.164 netmask 255.255.252.0 up
# ifconfig eth0.666:2 AAA.AAA.AAA.163 netmask 255.255.252.0 up
# ifconfig eth0.666:3 AAA.AAA.AAA.162 netmask 255.255.252.0 up
Taking down eth0.666:1 ALSO removes :2 and :3, leaving behind eth0.666:0
! ... so, the
problem seems to be sensitive to the address ranges used - removing the
first alias for
a range removes the others in that range, but not IP's from other ranges.
At the present time my only solution is to change the IPaddr script to
call another
script when taking down an interface - this script checks to see if I am
removing the
first alias in a VLAN setup, and if I am, re-creates the interface
definitions that are
needed.
If there is a simple fix, yippee; if not, who should I contact to see if
I can get a
fix put in place at some stage (yes, I know this is then not an issue
for the HA group
to solve).
Finally, here is a more complete example for those interested :-
[ Basic system information ]
server# cat /etc/redhat-release
CentOS release 5.5 (Final)
server# uname -a
Linux server 2.6.18-194.17.4.el5 #1 SMP Mon Oct 25 15:51:07 EDT 2010
i686 i686 i386 GNU/Linux
server# yum list | grep net-tools
net-tools.i386 1.60-81.el5
installed
[ Trunked VLAN 666 has been created on eth0. In this case eth0 has an
address in the
range I will be adding aliases to; but I believe I saw the same
problem even if
eth0 did not have an address associated with it at all. ]
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
...
[ All looks well, add 3 IP's to eth0.666 ]
server# ifconfig eth0.666:0 AAA.AAA.AAA.164 netmask 255.255.252.0 up
server# ifconfig eth0.666:1 AAA.AAA.AAA.163 netmask 255.255.252.0 up
server# ifconfig eth0.666:2 AAA.AAA.AAA.162 netmask 255.255.252.0 up
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
eth0.666:0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.164 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0.666:1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.163 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0.666:2 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.162 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
[ All OK. Remove eth0.666:0 ]
server# ifconfig eth0.666:0 down
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
...
[ *** Ugh *** eth0.666:1 and eth0.666:2 where removed along with
eth0.666:0 !!!! ]
[ I promise that I did not just delete them from the listing
:-) ]
[ Add the 3 IP's back to eth0.666 ]
server# ifconfig eth0.666:0 AAA.AAA.AAA.164 netmask 255.255.252.0 up
server# ifconfig eth0.666:1 AAA.AAA.AAA.163 netmask 255.255.252.0 up
server# ifconfig eth0.666:2 AAA.AAA.AAA.162 netmask 255.255.252.0 up
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
eth0.666:0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.164 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0.666:1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.163 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0.666:2 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.162 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
[ Remove eth0.666:1 rather than eth0.666:0 this time ]
server# ifconfig eth0.666:1 down
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
eth0.666:0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.164 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0.666:2 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.162 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
[ Well look at that, eth0.666:0 and eth0.666:2 are still there - that
works ]
[ Remove eth0.666:0 ]
server# ifconfig eth0.666:0 down
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
...
[ *** Ugh *** As before, removing eth0.666:0 has removed other entries,
in this case eth0.666:2 ]
[ Create a 'dummy' address on tne interface to check whether having
something else ]
[ as the first entry
helps ]
server# ifconfig eth0.666:0 192.168.1.1 netmask 255.255.252.0 up
server# ifconfig eth0.666:1 AAA.AAA.AAA.164 netmask 255.255.252.0 up
server# ifconfig eth0.666:2 AAA.AAA.AAA.163 netmask 255.255.252.0 up
server# ifconfig eth0.666:3 AAA.AAA.AAA.162 netmask 255.255.252.0 up
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
eth0.666:0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:192.168.1.1 Bcast:192.168.3.255 Mask:255.255.252.0
...
eth0.666:1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.164 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0.666:2 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.163 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0.666:3 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.162 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
server#
server# ifconfig eth0.666:1 down
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
eth0.666:0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:192.168.1.1 Bcast:192.168.3.255 Mask:255.255.252.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
...
[ *** No help *** The 'dummy' remained, but removing the interface with
the first ]
[ AAA.AAA.AAA.x address removed the rest
:-( ]
[ Finally, just to prove that everything works as expected on eth0:N
interface aliases ...]
server#
server# ifconfig eth0.666:0 down
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
...
server#
server# ifconfig eth0:0 AAA.AAA.AAA.164 netmask 255.255.252.0 up
server# ifconfig eth0:1 AAA.AAA.AAA.163 netmask 255.255.252.0 up
server# ifconfig eth0:2 AAA.AAA.AAA.162 netmask 255.255.252.0 up
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
...
eth0:0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.164 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0:1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.163 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0:2 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.162 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
server#
server# ifconfig eth0:0 down
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
...
eth0:1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.163 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
eth0:2 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.162 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
[ So removing eth0:0 did not remove eth0:1 and eth0:2 - works properly! ]
server# ifconfig eth0:2 down
server#
server# ifconfig
...
eth0 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.63 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
eth0.666 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet6 addr: ...
...
...
eth0:1 Link encap:Ethernet HWaddr xx:xx:xx:xx:xx:xx
inet addr:AAA.AAA.AAA.163 Bcast:bbb.bbb.bbb.255
Mask:255.255.252.0
...
...
server#
server# ifconfig eth0:1 down
server#
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