netdev - Re: cache forver in 3.2.0-rc2-00400-g866d43c ?

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Message-ID: <1322072541.2775.1.camel@edumazet-laptop>
Date:	Wed, 23 Nov 2011 19:22:21 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Arkadiusz Miśkiewicz <a.miskiewicz@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: cache forver in 3.2.0-rc2-00400-g866d43c ?

Le mercredi 23 novembre 2011 à 19:10 +0100, Arkadiusz Miśkiewicz a
écrit :
> Hello,
> 
> I'm using  my notebook in two different networks, suspending and resuming from 
> ram between.
> 
> Network A (192.168.1.0/24) has server with IP 87.204.99.133 in the same lan. 
> Now when I suspend, go to totally different network B (different provider, 
> different lan, 192.168.0.0/24) and resume then I'm unable to connect to 
> 87.204.99.133.
> 
> Looks like network stack thinks that 87...133 is still directly reachable on 
> eth1and I'm unable to make it forget that.
> 
> [root@...0 ~]# ip ne flush dev eth1; ip r flush table cache
> [root@...0 ~]# ip r show table cache to 87.204.99.133
> [root@...0 ~]# ping -c 1 87.204.99.133
> PING 87.204.99.133 (87.204.99.133) 56(84) bytes of data.
> From 192.168.0.5: icmp_seq=1 Destination Host Unreachable
> 
> --- 87.204.99.133 ping statistics ---
> 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms
> 
> zsh: exit 1     ping -c 1 87.204.99.133
> [root@...0 ~]# ip r show table cache to 87.204.99.133
> 87.204.99.133 dev eth1  src 192.168.0.5
>     cache <redirected>  ipid 0x2838 rtt 17ms rttvar 12ms cwnd 10
> 87.204.99.133 from 192.168.0.5 dev eth1
>     cache <redirected>  ipid 0x2838 rtt 17ms rttvar 12ms cwnd 10
> [root@...0 ~]# ip ne show to 87.204.99.133
> 87.204.99.133 dev eth1  FAILED
> 
> tcpdump in meantime sees this:
> 19:06:26.907153 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 
> 87.204.99.133 tell 192.168.0.5, length 28
> 19:06:27.908379 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 
> 87.204.99.133 tell 192.168.0.5, length 28
> 19:06:28.907084 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 
> 87.204.99.133 tell 192.168.0.5, length 28
> 19:06:29.907145 IP (tos 0xc0, ttl 64, id 34465, offset 0, flags [none], proto 
> ICMP (1), length 112)
>     192.168.0.5 > 192.168.0.5: ICMP host 87.204.99.133 unreachable, length 92
>         IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), 
> length 84)
>     192.168.0.5 > 87.204.99.133: ICMP echo request, id 17590, seq 1, length 64
> 
> Any ideas?
> 
> Thanks,

Hmm, could you check you have this fix in your tree ?

http://git2.kernel.org/?p=linux/kernel/git/davem/net.git;a=commit;h=9cc20b268a5a14f5e57b8ad405a83513ab0d78dc



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