Re: [Sheflug] Network configs

["Chris J/#6" <nospam [at] nccnet.co.uk>]

> Since NICs, and hubs and all that is favour of the moment, could someone
> tell me if this is possible:
> 
>  5 machines all on hub, plus one machine with two NICs, one to hub, and
> one to a sixth machine.
>  Can I access machine #6 from any machine, or would I have to log into
> machine #5 to get access to machine #6?
> 
> Cheers.
> 
> Baz.

On the machine with two cards, ensure there is a good routing table for both 
networks, then on all the other machines, make sure their routing tables are 
good. :) It's just basic routing ...

For example, say you had this config (assume netmask is 255.255.255.0):

                 +----+
[192.168.1.1]----|    |
                 |  H |
[192.168.1.2]----|    |     eth0           eth1
                 |  U |--[192.168.1.5 & 192.168.2.1]--[192.168.2.2]
[192.168.1.3]----|    |
                 |  B |
[192.168.1.4]----|    |
                 +----+


Each machine is in square brackets :) 

All you need is...
* in 192.168.1.1,2,3 and 4 a route that says "all traffic 
	for 192.168.2.2 to go via 192.168.1.5".
ie,
	route add -host 192.168.2.2 netmask 255.255.255.0 gw 192.168.1.5
or
	route add -net 192.168.2.0 netmask 255.255.255.0 gw 192.168.1.5

* in 192.168.2.2 a route that says all traffic for 192.168.1.0/24 to
	go via 192.168.2.1...ie,

	route add -net 192.168.1.0 netmask 255.255.255.0 gw 192.168.2.1

* in the gateway machine, two routes to manage the routing between each
	network, which Linux usually sets up every time you config the
	the network card, but for completeness:

	route add -net 192.168.1.0 netmask 255.255.255.0 dev eth0
	route add -net 192.168.2.0 netmask 255.255.255.0 dev eth1

Simple routing :)

Chris...


-- 
Chris Johnson            \  "If not for me then, do it for yourself. If not
sixie@nccnet.co.uk        \  for then do it for the world." -- Stevie Nicks
www.nccnet.co.uk/~sixie/   ~---------------------------------------+
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