Re: [Xen-users] Strange Networking Issue

[Jonathon Jones <xen@xxxxxxxxxx>]

Yes!  I got it working.

 echo 1 > /proc/sys/net/ipv4/ip_forward

Then to make it stick....

edit /etc/sysctl.conf
change net.ipv4.ip_forward = 1

although I have not reboot the machine to see if that makes it stick for sure since my machine is configured to attempt PXE boot form both nics and takes 10 minutes to reboot the machine.  That is my next project.

Anyways, thanks for all of the help.  I think that the netmask changes may have also been needed.

Jon

Jonathon Jones wrote:

Ok, scratch my last email.  I am tired and being silly.  I named the ifcfg script eth1 but put eth0 in the actual file...hence the network is down message.  Still unpingable though.  Xen just isn't forwarding that traffic along.

I just wonder if a route setup would be better instead of bridge?  But I don't know how to configure it aside form changing the main xen config script.  I also don't know if I would have to manually add an IP to dom0 every time I add one to a domU...

Anyways....

Jon

jez wrote:

On Sat, Mar 10, 2007 at 06:33:28PM -0500, Jonathon Jones wrote:
  

Well, I did as you suggested and changed the netmask for x.x.153.178 to 
255.255.252.0 and rebooted the machine just to give a clean slate.  I'm 
still in the same situation though.  Xen just isn't forwarding the 
packets to the domU for some reason.  I can watch the ping requests come 
in but since the IP is not bound to dom0, it doesn't respond to the 
request and the domU isn't responding to it, nor is it receiving the 
request according to tcpdump.

I just don't understand why xen isn't forwarding the traffic for some 
IP's but it is for others.  The only commonality to the IP's that do 
work are that they are the primary IP bound to eth0 in the domU.  It 
seems to me that if that IP works then any other IP's should work, 
especially if added tot he interface with the same network mask and 
everything so that ip addr show lists them the same way....

*confused and frustrated*

    

You kidding! we're only just getting started here. Actually, I think
things are looking quite good. My next suggestion is as follows:

Xen does not appear to like multiple addresses configured on the same
card, so lets configure one interface for each address. I should of seen this
earlier, but there's a lot of smoke around. Change the Dom1 config 
file to read:

vif=[ '', '', '' ]

I'm not sure if this will work as is, but it should create three
interfaces for Dom1 and add them all to the default bridge. Sorry, it's
not convienient for me to test this with my present setup.  We might
need to add mac="..." and/or bridge="..." statements - but hopefully it
should work as is.

Then in Dom1 configure each interface (eth0, eth1, eth2) with their own
address.

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