how to use DNAT for external ips in single computer setup

I am looking to use some sort of NAT (presumeably DNAT?) to rotate
between a few external ips at my disposal. I got a static IP service
from SBC, and it came with 5 ip's, so I am trying to use them all =)

Does anyone know how this is done using a one machine setup? All the
topologies that I have read about have a NAT box in front of the
application servers themselves. Can the NAT box and the application
server be the same machine?

Thanks in advance.

On 2006-09-07, (E-Mail Removed) <(E-Mail Removed)> wrote:
> I am looking to use some sort of NAT (presumeably DNAT?) to rotate
> between a few external ips at my disposal. I got a static IP service
> from SBC, and it came with 5 ip's, so I am trying to use them all =)

Just configure a bunch of virtual interfaces.

ifconfig first.virtual.ip.here eth0:1 up
ifconfig second.virtual.ip.here eth0:2 up

As long as your router is correctly routing the packets towards your
machine is ok.

Davide

--
The next hot technology from Microsoft will be object-oriented assembly.
-- From a Slashdot.org post

Hello,

Davide Bianchi a écrit :
>
> Just configure a bunch of virtual interfaces.
>
> ifconfig first.virtual.ip.here eth0:1 up
> ifconfig second.virtual.ip.here eth0:2 up

Weird syntax for an ifconfig command.
By the way, ethX:Y are not really virtual interfaces, they're just
obsolete labels for ifconfig to deal with extra IPv4 addresses on an
interface. Use "ip addr" instead of ifconfig and you won't need them any
more.