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Old 04-02-2004, 05:30 AM   #1
anGeR
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Registered: Oct 2003
Distribution: Slackware 13.37
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Question How to connect to a gateway on a different subnet?


Yo ppl,
I've got RH9 and two network cards and I'm connected to two networks
One is private 192.168.1.130 (eth1)
and second is public. 195.222.60.200 (eth0)

I started FTP server and users from both network's can access it.

The problem is that the gateway for the public network is on the different subnet (195.222.55.107) so when I shutdown private interface (eth1) I can's surf the net or anytnig else related to it.
Reason I can surf the net with private network is because the private network is connected to ISA server that have two nic's (of course), private and public and for the public, gateway is 195.222.55.107 (public eth on ISA server is 195.222.60.220 and private is 192.168.1.254).
So when users from private network want to surf they are going to gateway 192.168.1.254 (ISA private interface) and the ISA redirects them to 195.222.55.107 from the public interface which is 195.222.60.220 (I supose you know how ISA works)

So, what I want is to be able to surf from public IP (195.222.60.200/27) and to do that I need to config route to gateway on a different subnet (195.222.55.107/32).
Win2k/XP machines are doing that without problems.

Can you help me to solve this problem?

Thank you very much!
 
Old 04-09-2004, 08:50 AM   #2
ugge
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Registered: Dec 2000
Location: Gothenburg, SWEDEN
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Well your default gateway on RH9 should be the next router on the way toward the Internet. How this could be 195.222.55.107 I can't understand. There should be another gateway to use, one that is actually on the same network (195.222.60.200/27). IP addressing doesn't know the entire path to the destination, but rather the next hop.
You can set up routes static or dynamic telling the router where a specific destination is, but that would only contain information about the next hop to take toward the destination. That is the next router/gateway to use.

If no entry exist for the destination then the default gateway is used as a last resort. That's why the default gateway should be a machine on the same network.
 
  


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