LVS-NAT or direct routing or...?

[Graeme Fowler]

Hi

On 22/05/2006 15:38, Kristoffer Egefelt wrote:
> If I send a mail from a realserver to my gmail account, it have the source
> address of the loadbalancer.
> I would like it to have the source address of the Virtual Server. (so if I
> reverse lookup the source ip address in the mail I get the Virtual Server
> and not the loadbalancer)

Although the director is offering LVS service for you, this problem has 
nothing whatsoever to do with LVS.

You want a machine (the realserver) behind a masquerading server (the 
director) to appear to have a fixed IP address when making outbound 
connections to the internet.

Easy.

Simply have a SNAT rule on your director's external interface such that 
packets going out from the realserver get mapped to the VIP; assuming 
here that the external interface is eth0:

iptables -t nat -I POSTROUTING -o eth0 \
                 -s $REALSERVER_IP \
                 -d 0/0 \
                 -j SNAT --to-source $VIRTUAL_IP

I've used this many times to do a many-to-one mapping for realservers so 
that when they initiate external connections, they appear to come from 
the same IP.

Graeme