vserver development mailing list: [vserver] source IP messed up on multihomed guest with 2.6.38.6-vs2.3.0.37-rc15

From: Thomas Weber <l_vserver_at_mail2news.4t2.com>
Date: Fri 20 May 2011 - 01:03:40 BST
Message-ID: <1305849820.538.42.camel@morgoth.abyss.4t2.com>

My config:
debian 6.0.1 64bit

util-vserver: 0.30.216-pre2938

Host with 2 interfaces:
eth0
        address 192.168.105.1
        netmask 255.255.255.0
        broadcast 192.168.105.255
        network 192.168.105.0
        gateway 192.168.105.254

eth1
        address 192.168.1.54
        netmask 255.255.255.0
        network 192.168.1.0
        broadcast 192.168.1.255
        gateway 192.168.1.254

a guest with interfaces in both Networks (bcast,dev,ip,prefix)

# cat interfaces/00/*
192.168.105.255
eth0
192.168.105.21
24

# cat interfaces/99/*
192.168.1.255
eth1
192.168.1.64
24

Kernels are plain kernel.org + vserver patch

with 2.6.37.3-vs2.3.0.37-rc3.2
I can connect hosts on 192.168.1.0/24 just fine (from inside the guest)

with 2.6.38.6-vs2.3.0.37-rc15
this doesn't work anymore.

for ping tcpdump on the host shows me:
01:50:26.971098 IP 192.168.105.21 > 192.168.1.8: ICMP echo request, id 3185, seq 1, length 64
01:50:27.976957 IP 192.168.105.21 > 192.168.1.8: ICMP echo request, id 3185, seq 2, length 64

so it obiously takes the wrong source address (same with tcp or udp).

explicitly specifying 192.168.1.64 as source for ping/nc works.

do i miss something or is this a bug?

Tom
Received on Fri May 20 01:04:16 2011