Very Computer

We currently have one class C network 194.73.142.0.

How can we use another class C network on the same physical network?

Is it just a case of running another set of DNS records for the new class
C?

Thanks in advance.
--
Daniel Field
Technical Manager
Internet Access Ltd.

Quote:>Is it just a case of running another set of DNS records for the new class
>C?

Just put and extra route/ip address on your router's dowstream
interface.  For details see the answer I gave to the same question
last week (thread mutatated into a far more interesting question about
ICMP_REDIRECTs and IP aliasing).

Alternatively use a 255.255.254.0 netmask.  (I think someone else
explained that approach).

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In my experience there is a bit more to it than just DNS. You will need
to have a default gateway for network A and Network B.

A lot of OSs cannot handle having a Network A address while using a
Network B default address. OK, linux usually will but IRIX won't and
windows sometimes has trouble for example.

So basically you could use a router which can appear as two ip addresses
at once on the same interface. I tried to use proxy arp on the router to
achieve this but it caused so much network gridlock that I scrapped that
method.

Also you must remember that using two default gateways on the same
network will cause A-B and B-A traffic to be duplicated on the ethernet
hence using twice the expected bandwidth.

The solution was to use two routers - one internet router from Network A
to the outside world and the other router needs to have two ethernet
ports (physical) so that the interface doesnt cause a bottleneck. I used
a unix server with two ethernet cards then set the routes accordingly
making the network B interface the default gateway for the other B
machines.  All is well for several weeks of intense use so far.

Good Luck - email me if you have any more queries..

Bye

Phil Lewis

ifconfig eth0:0 194.73.143.1  etc...
route add -host 194.73.143.1 dev eth0:0
route add -net 194.73.143.0 dev eth0:0

For more information see
/usr/src/linux/Documentation/networking/alias.txt.

Have fun!

     Quack!
 _oo  /
/) -)   Greetings,
"-""         Arnoud.

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