From: Eric Dumazet <eric.dumazet@gmail.com>
To: "Arkadiusz Miśkiewicz" <a.miskiewicz@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: cache forver in 3.2.0-rc2-00400-g866d43c ?
Date: Wed, 23 Nov 2011 19:22:21 +0100 [thread overview]
Message-ID: <1322072541.2775.1.camel@edumazet-laptop> (raw)
In-Reply-To: <201111231910.37190.a.miskiewicz@gmail.com>
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@t400 ~]# ip ne flush dev eth1; ip r flush table cache
> [root@t400 ~]# ip r show table cache to 87.204.99.133
> [root@t400 ~]# 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@t400 ~]# 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@t400 ~]# 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
next prev parent reply other threads:[~2011-11-23 18:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-23 18:10 cache forver in 3.2.0-rc2-00400-g866d43c ? Arkadiusz Miśkiewicz
2011-11-23 18:22 ` Eric Dumazet [this message]
2011-11-23 18:31 ` Arkadiusz Miśkiewicz
2011-11-23 18:37 ` Eric Dumazet
2011-11-23 19:44 ` Eric Dumazet
2011-11-23 20:35 ` Arkadiusz Miśkiewicz
2011-11-25 17:53 ` Arkadiusz Miśkiewicz
2011-11-26 22:10 ` Eric Dumazet
2011-11-26 22:13 ` [PATCH] inet: Eric Dumazet
2011-11-26 22:16 ` Eric Dumazet
2011-11-27 0:17 ` David Miller
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