ip address question

user100 · 11-19-2010, 12:49 PM

Hi,

How can I get two ip addresses to communicate with each other which are not in the same 255 range?

Like:

192.168.0.1
and
192.168.1.1

Thanks.

grzesiek · 11-19-2010, 01:39 PM

iptables FORWARD?

0.o · 11-19-2010, 01:44 PM

http://en.wikipedia.org/wiki/Router

okcomputer44 · 11-19-2010, 01:50 PM

Quote:

route add -net 192.168.1.0 netmask 255.255.255.0 dev eth0
adds a route to the network 192.168.1.x via "eth0". The Class C netmask modifier is not really necessary here
because 192.* is a Class C IP address. The word "dev" can be omitted here.

This is from the man route command examples. You need to add new route(s) for your network(s) that your box does not know.

You have to do it on both boxes vica versa. Both boxes have to know the routes to properly communicate to each other.

Have a look this site for more info: http://www.labtestproject.com/linnet/routing.html

I hope this helped for you.

Laz.

markush · 11-19-2010, 03:52 PM

Hello user100,

change the mask to 255.255.128.0. Then both IP-adresses are in the same network (subnet) with the networkadress 192.168.0.0/23.

Markus

jefro · 11-19-2010, 08:41 PM

Well, or more simply 255.255.0.0 as netmask. They would then be on the same subnet and could then directly connect without a router or gateway.

The normal way to have two out of subnet is to use a gateway or router.

One could also put in a secondary IP within the the range on one of the nics.

Juako · 11-20-2010, 12:29 AM

If the two machines are in the same network, jefro or markush solution will work ok. If not, you need a router.

user100 · 11-20-2010, 04:00 AM

Thanks. It may take me a while to go through the info though.