Re: [Xen-users] xen domU ID and static routing

[Thomas Halinka <lists@xxxxxxxxx>]

Hi csdemmer,

Am Dienstag, den 05.01.2010, 14:29 +0100 schrieb Info - csdemmer:
> Hi,
> 
> I use a EQ 4 dedicated root server by hetzner with ubuntu jaunty. I
> installed xen 3.3 with debian kernel and brought up 3 domUs.
> Now comes networking...
> Hetzner does not allow bridged networking so I have to use routed mode
> in xen. No Problem so far, but the Problem actually is:
> When I bring up a domU the routing table is created by the xen-script
> vif-routing. The network interface name for this is created
> dynamically, depending on the domU ID.

Im just assigning one ip of the subnet to dom0, that acts as router....

# cat /etc/xen/scripts/network-hetzner
---
        #!/bin/bash
        #
        # This xen-network-scripts fires up the internal and external
        bridges,
        # and finally activates routing in dom0
        #
        #
        # thohal, 14.01.09
        #
        ###### 
        
        #
        # fire up internal bridge for openqrm
        # ...
        # .... some magic secrets in here :-)
        # ...
        # fire up external bridge public access
        # xx.yy.zz.16/27
        # usable ips: xx.yy.zz.161 - xx.yy.zz.190
        
        brctl addbr xen-public
        ifconfig xen-public xx.yy.zz.65 netmask 255.255.255.224 up
        
        
        #
        # finally activate routing and let dom0 act as a router
        #
        #
        
        echo 1 > /proc/sys/net/ipv4/ip_forward
        
make it executable (chmod +x), configure it in /etc/xen/xend-config.sxp
and restart xend...


> 
> Example:
> If the domU ID is 16, the network interfaces name will be vif16.0 in
> the dom0. So I tell shorewall (iptables frontend) that it shall ACCEPT
> traffic from an to vif16.0. The next time I restart my server or just
> the domU, there's a new network interface name, that the shorewall
> firewall does not know...
> 
> As far as I know there's no way to tell a xen domU to get a static ID,
> so the network interface name would be static as well.
> Any Ideas or solutions? 

hth,

thomas

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