[wellylug] IP addresses / per network card + routing + DNS

David Zanetti dave2 at wetstring.net
Fri Mar 19 16:25:42 NZDT 2004


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On Fri, 19 Mar 2004, Michael Dittmer wrote:

> I need to know if a single 10/100/1000Mbps network card can have multiple IP
> address and then using routing and DNS put this out onto a network using
> another 10/100/1000Mbps network card routed to multiple servers (ie: 1 IP to
> each server) attached to a 10/100/1000Mbps switch.

Multiple IP addresses for a single interface (IP aliasing) is certainly
supported for ethernet - it's usually just an ARP trick (the host responds
to all addresses it is aliased for with it's MAC, the same way it does for
a single address)

It sounds like you want to then forward/rewrite the traffic for that
address to some internal (privately addressed?) servers, in which case the
2.4 kernel (or later) will do this quite nicely.

Load balancing is another matter, but it's possible. 

Note: DNS round-robin is not load balancing, in case you were thinking of
using that to "balance the load". 

- -- 
David Zanetti           |  (__)             
#include <geek/unix.h>  |  ( oo    Mooooooo 
http://hairy.geek.nz/   |  /(_O ./         
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