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Need Help With Broadcast Routes

 
 
Will
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      07-28-2006, 06:14 AM
I've gotten decent at reading through the routing table output from the
command line route print command, adding and deleting static routes, etc.
I'm having more problems understanding what look to me like broadcast
routes. As one example of this, I have a network with many separate class
C network segments behind a firewall, constructed of addresses based on
172.16.0.0. I see a route on one key router for these networks that looks
like this:

172.16.255.255 255.255.255.255 172.16.95.1

172.16.95.1 is one of quite a few network interfaces on the router. How
should I be reading the above? It seems to be saying that anytime a
broadcast comes in on any segment attached to the router, that it should
push the broadcast out to the 172.16.95.0 network via the 172.16.95.1
gateway IP.

This is not the behavior I want. I don't want to pass any broadcasts
through the router. What should I do to stop the broadcast on the
segment it originates?

--
Will


 
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Neteng
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      07-28-2006, 01:04 PM
Please sanitize your router config and post it. That route will not
necessarily pass broadcasts, there are other commands that allow that. If
the router is configured to route broadcasts then this route will be used.
If you post the config, we can help.

"Will" <westes-(E-Mail Removed)> wrote in message
news:(E-Mail Removed) ...
> I've gotten decent at reading through the routing table output from the
> command line route print command, adding and deleting static routes, etc.
> I'm having more problems understanding what look to me like broadcast
> routes. As one example of this, I have a network with many separate

class
> C network segments behind a firewall, constructed of addresses based on
> 172.16.0.0. I see a route on one key router for these networks that

looks
> like this:
>
> 172.16.255.255 255.255.255.255 172.16.95.1
>
> 172.16.95.1 is one of quite a few network interfaces on the router. How
> should I be reading the above? It seems to be saying that anytime a
> broadcast comes in on any segment attached to the router, that it should
> push the broadcast out to the 172.16.95.0 network via the 172.16.95.1
> gateway IP.
>
> This is not the behavior I want. I don't want to pass any broadcasts
> through the router. What should I do to stop the broadcast on the
> segment it originates?
>
> --
> Will
>
>



 
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