[Users] 2nd interface loses packets on using veth

[Julian Yap]

Thanks.

HOST: ip a ls

2: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
4: sit0: <NOARP> mtu 1480 qdisc noop
    link/sit 0.0.0.0 brd 0.0.0.0
6: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:18:8b:77:f2:01 brd ff:ff:ff:ff:ff:ff
    inet 192.168.100.247/24 brd 192.168.100.255 scope global eth0
    inet6 fe80::218:8bff:fe77:f201/64 scope link
       valid_lft forever preferred_lft forever
8: eth1: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 00:18:8b:77:f2:02 brd ff:ff:ff:ff:ff:ff
    inet 10.100.225.247/24 brd 10.100.225.255 scope global eth1
    inet6 fe80::218:8bff:fe77:f202/64 scope link
       valid_lft forever preferred_lft forever
1: venet0: <BROADCAST,POINTOPOINT,NOARP> mtu 1500 qdisc noqueue
    link/void
3: veth101.0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
    link/ether 00:16:3e:23:d5:dd brd ff:ff:ff:ff:ff:ff
    inet6 fe80::216:3eff:fe23:d5dd/64 scope link
       valid_lft forever preferred_lft forever
5: veth101.1: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
    link/ether 00:16:3e:7e:a5:2e brd ff:ff:ff:ff:ff:ff
    inet6 fe80::216:3eff:fe7e:a52e/64 scope link
       valid_lft forever preferred_lft forever

HOST: ip r ls

10.100.225.106 dev veth101.1  scope link
192.168.100.106 dev veth101.0  scope link
192.168.100.0/24 dev eth0  proto kernel  scope link  src 192.168.100.247
10.100.225.0/24 dev eth1  proto kernel  scope link  src 10.100.225.247
169.254.0.0/16 dev eth1  scope link
default via 192.168.100.1 dev eth0

VE: ip a ls

1: lo: <LOOPBACK,UP,10000> mtu 16436 qdisc noqueue
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
3: venet0: <BROADCAST,POINTOPOINT,NOARP> mtu 1500 qdisc noqueue
    link/void
5: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
    link/ether 00:16:3e:69:ce:df brd ff:ff:ff:ff:ff:ff
    inet 192.168.100.106/32 scope global eth0
    inet6 fe80::216:3eff:fe69:cedf/64 scope link
       valid_lft forever preferred_lft forever
7: eth1: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
    link/ether 00:16:3e:1d:0d:54 brd ff:ff:ff:ff:ff:ff
    inet 10.100.225.106/32 scope global eth1
    inet6 fe80::216:3eff:fe1d:d54/64 scope link
       valid_lft forever preferred_lft forever

VE: ip r ls

192.168.100.0/24 dev eth0  scope link
10.100.225.0/24 dev eth1  scope link
default dev eth0  scope link

On 3/14/07, Andrey Mirkin <major at openvz.org> wrote:
> Hello,
>
> Please provide ip configuration (ip a ls) and route tables (ip r ls) for host
> system and VE.
>
> Regards,
> Andrey
>
> On Thursday 15 March 2007 06:16 Julian Yap wrote:
> > Kind of related to my previous posting.
> >
> > I've now setup my 2 VE interfaces using veth method.
> >
> > No longer using Source based routing, I've set up my default route to
> > be 192.168.0.1.
> >
> > Pinging on the 192.168.0.x subnet is perfect from the VE.
> >
> > Pinging on my VE's 2nd interface (eth1) works OK in burst but at times
> > just drops packets.
> >
> > Running a tcpdump, I see a log of these messages:
> > 17:10:29.813495 arp who-has machine15 tell 192.168.1.247
> >
> > When it does work OK, it's because it's returned this:
> > 17:14:35.829082 arp who-has machine15 tell 192.168.100.247
> > 17:14:36.828053 arp who-has machine13 tell machine15
> > ...
> > 17:14:36.828082 arp reply machine13 is-at 00:16:3e:7e:a5:2e
> >
> > Any clues why it arp's so much?
> >
> > - Julian
> > _______________________________________________
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>