[BUGS] mail servers and ip aliasing

[Jerahmy Pocott]

On 13/05/2008, at 12:38 PM, jonathan michaels wrote:

> reading about stuff like ip-aliasing gets a bit confusing at
> time, so many articles so many different way of doing it ..
> grr. the only problem is that i need this box to keep its
> current 'identity' as its doing some small but important stuff.

> are there any things that i should be mindfull of it i alias
> this box with the current mx hosts ip address to this server
> then setup a new sendmail/postfix/exim network mail server on
> teh new box.

So you want this machine to have multiple IP addresses on the one  
interface?

It will take over an IP that is currently being used as the MX?

This should work fine, but you want to be careful of what services  
listen on which address, since most by default listen on all  
interfaces..

Your router/switch needs to associate that interfaces MAC with both  
addresses, but that should happen automatically unless you have a  
complicated topology going there.. I'v had trouble with putting one  
interface on different subnets before...