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Routing 2 Seperate networks both directions.

Posted on 2004-10-07
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Last Modified: 2010-03-18
Mandrake Linux 10.1, Dual NIC

Network 1) 192.168.x.x  Eth0  Bound 192.168.1.249
Network 2) 172.016.x.x  Eth1  Bound 172.016.100.102

I need to route in the following fashion.

1) I need to get various 172.016.x.x IP's to 192.168.1.4
    Example 172.016.014.020 --> 192.168.1.4

2) I need to get 192.168.1.100 to various 172.016.x.x
    Example: 192.168.1.100 --> 172.016.010.020

I am not sure what to even use to route both directions in this fashion. IPtables?  We are trying to keep the 2 networks separate other than implicit routes.  Each of these implicit routes can be completely open.

I have about 8 routes for each direction.
Trying to have this up and running by end of day Friday.  
Any assistance with location of configuration information within Mandrake will help that much more.
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Question by:Foodcoman
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by:blkline
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On your Linux box:

echo 1> /proc/sys/net/ipv4/ip_forward

Now add a route entry to the machines on the 172...  network that points to  192.168.1.249, and vice-versa.

Assuming that you have no firewall in place it should just work.

I think that should do the trick.

BK
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by:Foodcoman
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Thank you, that helps some however, I need an implementation that will allow the linux box to handle this entirely.

This for 2 reasons.

1) Centralized Adminstration
2) Limited access to workstation

P.S.
I have no restrictions on using additional unused IP's for the Linux Box on each network to help with the implementation.
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blkline earned 500 total points
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You need to tell the clients how to reach machines on the other network.  So you have few choices:  

1) configure each client so that they know to use that Linux box as a gateway for a particular network, or
2) configure the router that services each network to use the Linux box as a next hop for the other network, or\
3) configure the Linux box as the default router for each network and go from there to another router for outside both nets.

You didn't give much detail about your network, so I can't give much of an answer other than that.  If you want, draw a small ASCII diagram and provide more detail and we can go from there.

Barry
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