Dear all
I have 3 LAN (172.27.113.* and 11.*.*.* and 10.*.*.*)
I want to add (Linux fedora core 3) as a Router between them
How can I do it?
Thanks

That's a fairly simple setup. I've got my FC4 box running as a router between my dialup connection and my LAN and wireless LAN, and that setup is slightly more complex as it involves NAT, but yours should bee fairly straightforward.

Install FC3 on your machine of choice (any particular reason why FC3 and not FC4?). Edit /etc/sysconfig/network and change the line reading

to read

That's all there is to it. You may also want to configure the firewall a bit - the default RedHat firewall configuration out-of-the-box leaves the FORWARD chain (which is the chain used for routed packets) with a policy of ALLOW, which is a bit insecure, so you may want to tie that down a bit, particularly any of these machines has access to the internet - you may for example want to set it so that packets with a state of ESTABLISHED or RELATED are always permitted, and packets from your 3 LAN networks are permitted out to the internet, packets between LAN networks are permitted, but any other packets in from the internet are dropped.

By the way, you do know that 11.0.0.0/8 isn't a privately-assigned IP range? So if you ever wanted to access a website that had an 11.0.0.0 address you wouldn't be able to because you're using the subnet as your local LAN.

i will try it

but i want to tell you my structure


.............................internet
--------------------------------------------------------
|..............................|.................................|
VPN1.......................VPN2..........................VPN3
DHCP.......................DHCP....................... DHCP
172.27.113.1........11.1.1.1.....................10.1.1.1
255.255.0.0..........255.0.0.0..................255.0.0.0
|...........................|................................|
>>>>>>>>>>>router<<<<<<<<<<<<


I want to add router between this LANs
And VPN's server is windows

note: dots is spaces

thanx

Yeah, that should work fine. You'll need three network cards on the router box, and you'll either need to set each DHCP to use the router as the default gateway, or you'll need to put static routes in on each machine on each subnet to send traffic to the other two subnets via the router. Either way it's a bit messy because of your network topology.