Re: [Xen-users] Can't ping gateway on new host

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-10-20 at 16:32 -0500, George Ficzeri wrote:
> Greetings,
> 
> I hope this is the correct place to go to ask for help.  I've inherited
> a Xen server that hosts 5 FreePBX servers.  I've installed FreePBX on a
> sixth, but cannot for the life of me get networking working.  I have
> assigned two static addresses to my two interfaces in the guest machine,
> but cannot ping the gateway, and am not seeing arp.

You have two devices and so gateways, do neither of them work or are the
problems only with one?

> Ifconfig from the xen guest (copy,paste doesn't work for me over VNC)
> eth0
> IP: 192.168.14.9/24
> GW:192.168.14.1

Silly question, but since this appears to be the first/only VM on VLAN
115, are you sure that 192.168.14.1 is on the correct VLAN?

Is br115/VLAN115 something you setup fresh for this new VM or is it a
preexisting known good setup?

[...]
> I noticed there's some matching in the mac addresses.  I tried changing
> one (thinking it was conflicting) and it stopped working until I changed
> the mac back.

It is a little unconventional, but the fact that they are on different
VLAN's might save you? (I'm not sure of this, since they do eventually
go over the same trunk).

The fact that things broke when you changed it makes me want to ask if
you have any MAC address filtering going on, either in dom0 or perhaps
in your infrastructure switches.

Assuming none of the above leads to a solution I think the next step
would be to tcpdump each interface along the way (so
tapN->br115->peth1.115->peth1->offbox) and see if you can identify how
far the traffic is getting before it gets squelched.

Ian.


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