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

[George Ficzeri <georgef@xxxxxxxxxxx>]

Thanks for the reply, Ian.

On 10/21/14, 4:24 AM, Ian Campbell wrote:
> 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?

Both.  I made a mistake earlier in that the 192.168.14.9/24 interface
does not have a gateway.  I understand now that this interface is used
to talk to the handsets.  eth1 (192.168.194.17/27) is where I should be
able to get out to the Internet from.
> 
>> 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?

It was copied from a shutdown preexisting setup.  I changed the .conf
file to boot to an .iso to install the OS.
> 
> [...]
>> 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.

Thanks.  I will check on this and if not tcpdump the interfaces.
> 
> Ian.
> 
> 
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