Re: [Xen-users] DomU Bridged vs. Routed Networking?

[Nivedita Singhvi <nsnix@xxxxxxxxxxx>]

Andy Lee wrote:
> Is there a performance difference between bridged and routed DomU 
> networking?
> Seems like most users opt for the bridged approach.  Perhaps it's 
> because it is easier to setup and it is the default setting.  For route, 
> I spent several days to learn that 
> /proc/sys/net/ipv4/conf/eth0/proxy_arp needs to be set to 0.  It is not 
> (Debian Sarge).  It should probably be added to 
> /etc/xen/scripts/network-route.
> I also modified scripts/vif-route (using iptables) to forward only 
> packets belonging to each domU's IP address, thereby preventing domU's 
> from using IP addresses not assigned to them.  With bridge, I'd need to 
> install etables - one extra program to install and learn.
There is one other factor which some people have noticed
and pointed out on this list: the interface is in promiscuous mode
in the bridging scenario, which deteriorates performance.
Your mileage may vary.

thanks,
Nivedita


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