Re: Second failover failure with conntrackd - INVALID packets

[Yoann Juet <yoann.juet@univ-nantes.fr>]

[-- Attachment #1: Type: text/plain, Size: 2330 bytes --]

Pablo,

Pablo Neira Ayuso wrote:
> Yoann Juet wrote:
>> Pablo Neira Ayuso wrote:
>>>> As you can see, this TCP connection is present:
>>>>
>>>> root@fw1-irt:~# conntrack -L  |grep 34189
>>>> conntrack v0.9.10 (conntrack-tools): 14 flow entries has been shown.
>>>> tcp      6 10581 ESTABLISHED src=172.18.244.10 dst=193.52.101.32
>>>> sport=34189 dport=5222 packets=63 bytes=12039 src=193.52.101.32
>>>> dst=172.18.244.10 sport=5222 dport=34189 packets=58 bytes=22146
>>>> [ASSURED] mark=0 secmark=0 use=1
>>> This is weird, look like some problem in your scripts or the commit is
>>> not working in node fw1-irt. The packet counters of the entry above show
>>> that this is the old entry which is stuck in the cache after the second
>>> failover. This should be deleted when fw1-irt's script issues the commit
>>> (conntrackd -c). Does the log file tells that the commit was successful?
>>>
>> I confirm that "conntrackd -c" is executed on FW1-IRT on the second
>> failover. FYI, my LSB script executes the following instructions (start=
>> new active node ; stop = new passive node):
>>
>> ...
>> case "$1" in
>>         start)
>>                 conntrackd -c -C /etc/conntrackd.conf
>>                 conntrackd -f -C /etc/conntrackd.conf
>>                 conntrackd -R -C /etc/conntrackd.conf
>>                 exit 0
>>                 ;;
>>
>>         stop)
>>                 #conntrackd -t -C /etc/conntrackd.conf
>>                 conntrackd -n -C /etc/conntrackd.conf
>>                 exit 0
>>                 ;;
> 
> Before the second failover, does conntrackd -e in FW1-IRT (now in backup
> mode) show, at least, one entry that talks about the TCP connection that
> is in trouble? I think that it will not show any (but it should show
> one, so I think that I have found the problem ;). Please, confirm this
> and I'll get back to you with a possible solution soon.

You're right, the external cache on FW1 is empty before the second failover.

> 
> BTW, why your script does not invoke the '-t', did you notice any
> problem? That schedules the cleanup of the kernel conntrack table after
> PurgeTimeout seconds when a node enters backup mode.
> 

I was just testing with and without this instruction that was not 
available on conntrackd 0.9.6.

> Thanks for your patience.
> 

Thanks for your assistance !

[-- Attachment #2: yoann_juet.vcf --]
[-- Type: text/x-vcard, Size: 375 bytes --]

begin:vcard
fn:Yoann Juet
n:Juet;Yoann
org;quoted-printable:;DSI Universit=C3=A9 de Nantes
adr;quoted-printable:BP92208;;2, rue de la Houssini=C3=A8re;Nantes;;44322;France
email;internet:yoann.juet@univ-nantes.fr
title;quoted-printable:Ing=C3=A9nieur s=C3=A9curit=C3=A9 & r=C3=A9seau
tel;work:02.51.12.53.93
tel;fax:02.51.12.58.60
x-mozilla-html:FALSE
version:2.1
end:vcard