Re: [Xen-users] multiple vif's/bridges

[andrew mathes <amathes@xxxxxxxxxxxx>]

all i can think of now is it's a routing issue- here is my route -n on 
dom0:
10.255.0.0      10.254.1.254    255.255.255.0   UG    0      0        0 eth0
10.254.1.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.1.1.0        0.0.0.0         255.255.255.0   U     0      0        0 xen-br1
10.254.0.0      10.254.1.254    255.255.0.0     UG    0      0        0 eth0
0.0.0.0         10.1.1.254      0.0.0.0         UG    0      0        0 xen-br1

and from domU:

Destination     Gateway         Genmask         Flags Metric Ref    Use 
Iface
10.255.0.129    10.254.1.254    255.255.255.255 UGH   0      0        0 eth0
10.255.0.0      10.254.1.254    255.255.255.0   UG    0      0        0 eth0
10.254.1.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
10.1.1.0        0.0.0.0         255.255.255.0   U     0      0        0 eth1
10.254.0.0      10.254.1.254    255.255.0.0     UG    0      0        0 eth0
0.0.0.0         10.1.1.254      0.0.0.0         UG    0      0        0 eth1

so, it looks to me like both things are routing correctly ... but I can't 
get anywhere through the 10.1.1. subnet ... (eth1/xen-br1 (tied to dom0 
eth3 which is 10.1.1.53))
arp -a (dom0):
sudo arp -a
? (10.1.1.243) at 00:11:43:FD:71:8C [ether] on xen-br1
? (10.254.1.254) at <incomplete> on eth0

no arp -a output on domU

ifconfig output looks good, as well as brctl, everything looks bound 
correctly, although i'm still confused why vifX.1 while bound to xen-br1 
doesn't get it's mac address ... seems odd to me
well, that's all the output i can do, and if there's nothing wrong in 
these routes ... i'm stumped, one network card for me i guess =/
On Mon, 2 May 2005, Nivedita Singhvi wrote:

> andrew mathes wrote:
>
> >  hm, tcpdump from external -> eth3 of dom0 looks fine
> >
> >  tcpdump from exteran -> eth1 of domU = no reply
> >
> >  tcpdump from eth3 -> ext = fine
> >
> >  tcpdump from eth3->domU ... the ping says it's ok, but tcpdump shows 
> >  nothing
> >  likewise domU->eth3 ... says it's pinging, but tcpdump shows nothing
> >
> >  so is what's happening here is both sides pinging the bridge, but nothing 
> >  is going through?  i have this in dmesg:
> >  device vif1.0 entered promiscuous mode
> >  xen-br0: port 1(vif1.0) entering learning state
> >  xen-br0: topology change detected, propagating
> >  xen-br0: port 1(vif1.0) entering forwarding state
> >  device vif1.1 entered promiscuous mode
> >  xen-br1: port 2(vif1.1) entering learning state
> >  xen-br1: topology change detected, propagating
> >  xen-br1: port 2(vif1.1) entering forwarding state
> >
> >  so that looks good ...
> >
> >  i'm not supposed to make the domU gateway the same as the domO nic or 
> >  anything am i?
> Sorry to come so late to this thread - but did you
> share your routes (ip route show, or netstat -rn) output,
> also your arp -a, ifconfig -a?
>
> If you have two real interfaces on the same subnet,
> you may need to set arp_filter on.
>
> thanks,
> Nivedita
>
>
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