Networking problem with host

[Ben]

Xen plays with your networking a lot, and the default way it does things seems 
quite awkward to me if you have more than a single interface. I've found this to 
be quite helpful:

http://wiki.xensource.com/xenwiki/XenNetworkingSuse?highlight=%28XenNetwo...


On Tue, 4 Apr 2006, Mark A Heilpern wrote:

>  Hello,
>  
>  I'm using FC5 and have near zero experience with Xen, and I'm running into a
> problem I can't locate answers for.
>  
>  First... my system without Xen running: I have two ethernet interfaces, eth0 and eth1,
> where eth1 is connected to the internet and eth0 is my private
>  NAT'd network; this system is my firewall. I'm using Firestarter to configure
> things and I'm able to connect FC5 to any location I wish, internal and
>  external, and my internal machines are able to connect to the firewall as well as the
> internet. Both eth0 and eth1 are configured as static IPs, and
>  all machines in my private network are static IPs (
>  
>  
>  Now, my firewall is also running other services and I'm interested in moving these
> services to their own virtual guest machines eventually. First
>  though, I think I should be able to boot into a Xen-enabled kernel and have the same
> level of functionality I currently have without Xen. My kernel
>  boots fine and seems to operate but I'm not able to do much with networking... I
> can't connect to any machine (through eth0 or eth1) from my Xen0
>  kernel, and my private network machines cannot connect to my firewall or through my
> firewall.
>  
>  I see many posts where people have guest O/S networking issues... but in my case I
> haven't even reached the stage of trying to create a guest O/S.
>  
>  Thanks for any tips towards my getting this resolved!
>  
>  
>

[Mark A Heilpern]

Thanks for the response, I definitely appreciate it.

What I'm seeing is from boot to boot into the Xen0 kernel, it seems to be random which
network card gets assigned to eth0 and which to eth1. I haven't rebooted enough since
upgrading to FC5 to know if this is tied to the Xen kernel or just an FC5 thing, but I
never saw it with FC4.

My modprobe.conf contains alias lines for eth0 and 1, binding them to specific drivers
(the cards are not identical), but I guess this isn't being honored.

Has anyone else seen anything like this?

-------------------------
Original Message:
From: Ben <bench(a)silentmedia.com&gt;
To: Mark A Heilpern <mark(a)heilpern.com&gt;
Date: Tuesday, April 4 2006 01:52 PM
Subject: Re: [Fedora-xen] Networking problem with host
Xen plays with your networking a lot, and the default way it does things seems 
quite awkward to me if you have more than a single interface. I've found this to 
be quite helpful:

http://wiki.xensource.com/xenwiki/XenNetworkingSuse?highlight=%28XenNetwo...


On Tue, 4 Apr 2006, Mark A Heilpern wrote:

>  Hello,
>  
>  I'm using FC5 and have near zero experience with Xen, and I'm running into a
> problem I can't locate answers for.
>  
>  First... my system without Xen running: I have two ethernet interfaces, eth0 and eth1,
> where eth1 is connected to the internet and eth0 is my private
>  NAT'd network; this system is my firewall. I'm using Firestarter to configure
> things and I'm able to connect FC5 to any location I wish, internal and
>  external, and my internal machines are able to connect to the firewall as well as the
> internet. Both eth0 and eth1 are configured as static IPs, and
>  all machines in my private network are static IPs (
>  
>  
>  Now, my firewall is also running other services and I'm interested in moving these
> services to their own virtual guest machines eventually. First
>  though, I think I should be able to boot into a Xen-enabled kernel and have the same
> level of functionality I currently have without Xen. My kernel
>  boots fine and seems to operate but I'm not able to do much with networking... I
> can't connect to any machine (through eth0 or eth1) from my Xen0
>  kernel, and my private network machines cannot connect to my firewall or through my
> firewall.
>  
>  I see many posts where people have guest O/S networking issues... but in my case I
> haven't even reached the stage of trying to create a guest O/S.
>  
>  Thanks for any tips towards my getting this resolved!
>  
>  
>

[Robert Story]

On Tue, 4 Apr 2006 22:20:07 -0400 (EDT) Mark wrote:
MAH> What I'm seeing is from boot to boot into the Xen0 kernel, it seems to be
MAH> random which network card gets assigned to eth0 and which to eth1.

Check out 'man iftab'... it can tie interfaces to specific mac addresses..
Don't know how it interacts with xen, though...