Re: [Xen-users] Dom0 seeing traffic on br0 but it's not routing

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Nov 22, 2013 at 11:18:01AM -0600, Glenn E. Bailey III wrote:
> Hello,
> 
> I've beaten my head against the wall on trying to get bridging working
> on a new dom0 install. I initially went  with CentOS 6 w/Xen 4.2 but
> figured that the xl toolkit not being fully supported was the issue so
> I went with SLES 11.3 and I'm having the same issue.
> 
> The issue is that appears to be that bridging isn't fully working as
> the DomU can't ping anything *other* than the Dom0. When I do a
> tcpdump on the DomU I can see the correct arp traffic that the Dom0
> should be seeing, but I can't ping the gw on that network, again only
> the Dom0 ip. Also, when I do a tcpdump on the Dom0 I can see the DomU
> sending arp request trying to find the gw I'm trying to ping.
> 
> Some basic config info:
> 
> xen-den:~ # brctl show
> bridge name    bridge id        STP enabled    interfaces
> br0        8000.0025b50002fb    no        eth0
> 

You vif doesn't seem to be on br0? Try brctl addif?

If that works, then you probably need to look at hotplug scripts and
figure out why it doesn't work.

Wei.

> xen-den:~ # ifconfig # only br0 and eth0
> br0       Link encap:Ethernet  HWaddr 00:25:B5:00:02:FB
>           inet addr:10.157.209.8  Bcast:10.157.209.255  Mask:255.255.254.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:30071 errors:0 dropped:321 overruns:0 frame:0
>           TX packets:3250 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:1634697 (1.5 Mb)  TX bytes:18920997 (18.0 Mb)
> 
> eth0      Link encap:Ethernet  HWaddr 00:25:B5:00:02:FB
>           UP BROADCAST RUNNING MULTICAST  MTU:9000  Metric:1
>           RX packets:30050 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:15647 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:2301897 (2.1 Mb)  TX bytes:19801909 (18.8 Mb)
> 
> 
> xen-den:~ # route
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> default         10.157.208.1    0.0.0.0         UG    0      0        0 br0
> 10.157.208.0    *               255.255.254.0   U     0      0        0 br0
> loopback        *               255.0.0.0       U     0      0        0 lo
> 
> xen-den:~ # grep vif /etc/xen/centos.cfg
> vif=["bridge=br0,model=e1000"]
> 
> Any ideas?
> 
> -- 
> I've seen things you people wouldn't believe. Attack ships on fire off
> the shoulder of Orion. I watched C-beams glitter in the dark near the
> Tannhauser gate. All those moments will be lost in time... like tears
> in rain... Time to die.
> 
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