Re: [Xen-users] Multiple physical interfaces problems

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Andrew McGlashan wrote:

A long and detailed description of the setup, but not what the problem is !

> What am I missing here?
What isn't working ?

I have spotted one fundamental error, which is one I've made in the 
past :-/ And I recall scratching my head for ages until I took a tea 
break, and when I came back the penny dropped.

> Dom0
>
> Destination  Gateway       Genmask       Flags  MSS Window irtt Iface
> 192.168.1.0  0.0.0.0       255.255.255.0 U        0 0         0 eth0
> 192.168.2.0  0.0.0.0       255.255.255.0 U        0 0         0 eth1
> 192.168.3.0  192.168.2.1   255.255.255.0 UG       0 0         0 eth0
> 0.0.0.0      192.168.1.254 0.0.0.0       UG       0 0         0 eth1
I'm guessing that Dom0 can communicate with devices in the 
192.168.1.0/24 and 192.168.2.0/24 networks, but not those on the 
wider internet or 192.168.3.0/24 ?
The routes for the latter are on the wrong interfaces :
The default gateway of 192.168.1.254 is reachable via eth0, not eth1.
The router 192.168.2.1 is reachable via eth1, not eth0.

> DomU
>
> Destination  Gateway       Genmask       Flags  MSS Window irtt Iface
> 192.168.1.0  0.0.0.0       255.255.255.0 U        0 0         0 eth1
> 192.168.2.0  0.0.0.0       255.255.255.0 U        0 0         0 eth0
> 192.168.3.0  192.168.2.1   255.255.255.0 UG       0 0         0 eth1
> 0.0.0.0      192.168.1.254 0.0.0.0       UG       0 0         0 eth0
Ditto except eth0 and eth1 appear to be swapped round.
But this is inconsistent with other information provided :
> vif         = [
>                   'mac=00:16:3E:24:79:D6, bridge=eth0',
>                   'mac=00:16:3E:24:79:D7, bridge=eth1',
>               ]
This suggests that DomU eth0 should be connected to the eth0 host 
bridge, and similarly for eth1.
> DomU
>
> eth0  Link encap:Ethernet  HWaddr 00:16:3e:24:79:d6
>       inet addr:192.168.1.201  Bcast:192.168.1.255  Mask:255.255.255.0
>       inet6 addr: fe80::216:3eff:fe24:79d6/64 Scope:Link
>       UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>
> eth1  Link encap:Ethernet  HWaddr 00:16:3e:24:79:d7
>       inet addr:192.168.2.201  Bcast:192.168.2.255  Mask:255.255.255.0
>       inet6 addr: fe80::216:3eff:fe24:79d7/64 Scope:Link
>       UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
This backs that up.

So both of those are inconsistent with the DomU routing table shown.

--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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