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* bridge + arp
@ 2008-09-19 18:58 Moritz Möller
  2008-09-19 19:35 ` Shaun R.
                   ` (3 more replies)
  0 siblings, 4 replies; 9+ messages in thread
From: Moritz Möller @ 2008-09-19 18:58 UTC (permalink / raw)
  To: xen-devel

Hi,

this is propably bridge related and not really a xen problem, but it
might help someone:

Some of our domUs are not able to arp. Arp -n show (incomplete), and
doing a tcpdump shows, that on the dom0's eth0 the arp request goes out,
the response comes in, but on the vifX.0 interface the arp response is
gone. 

dom0# tcpdump -ni eth0
arp who-has 10.32.2.51 tell 10.32.7.70
arp reply 10.32.2.51 is-at 00:30:48:34:44:6c

dom0# tcpdump -ni br0
arp who-has 10.32.2.51 tell 10.32.7.70
arp reply 10.32.2.51 is-at 00:30:48:34:44:6c

dom0# tcpdump -ni vif3.0
arp who-has 10.32.2.51 tell 10.32.7.70

Does someone know why the dom0 br0 or vif eats the arp response?

Thanks a lot,

Moritz


ip a l
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
2: eth0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen
1000
    link/ether 00:30:48:34:13:dc brd ff:ff:ff:ff:ff:ff
    inet6 fe80::230:48ff:fe34:13dc/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether 00:30:48:34:13:dd brd ff:ff:ff:ff:ff:ff
4: br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue qlen 20000
    link/ether 00:30:48:34:13:dc brd ff:ff:ff:ff:ff:ff
    inet 10.32.2.50/14 brd 10.35.255.255 scope global br0
    inet6 fe80::230:48ff:fe34:13dc/64 scope link
       valid_lft forever preferred_lft forever
5: vif1.0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen
32
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fcff:ffff:feff:ffff/64 scope link
       valid_lft forever preferred_lft forever
6: vif2.0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen
32
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fcff:ffff:feff:ffff/64 scope link
       valid_lft forever preferred_lft forever
7: vif3.0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc pfifo_fast qlen
32
    link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
    inet6 fe80::fcff:ffff:feff:ffff/64 scope link
       valid_lft forever preferred_lft forever


brctl show
bridge name     bridge id               STP enabled     interfaces
br0             8000.0030483413dc       no              eth0
                                                        vif1.0
                                                        vif2.0
                                                        vif3.0

^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2008-09-22 11:44 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2008-09-19 18:58 bridge + arp Moritz Möller
2008-09-19 19:35 ` Shaun R.
2008-09-19 20:26   ` Moritz Möller
2008-09-19 20:27 ` Moritz Möller
2008-09-20  8:10   ` Keir Fraser
2008-09-19 20:37 ` Phil Winterfield (winterfi)
2008-09-19 20:45 ` Moritz Möller
2008-09-20 23:04   ` Moritz Möller
2008-09-22 11:44     ` bridge + arp [SOLVED] Moritz Möller

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