Re: [LARTC] Will advanced linux routing help me

[Ramin Alidousti <ramin@UU.NET>]

On Wed, Apr 25, 2001 at 09:39:27AM +0200, Arthur van Leeuwen wrote:

> Doei, Arthur. (The tricky part is the link-state monitoring... at the TCP/IP
>                level this is theoretically impossible...)

Yes, indeed. There is no special protocol for this. That's why OSPF and
his younger and older brothers have those HELO packets. That's why TCP
has the optional keepalive segments (although, in case of TCP it's an
end-to-end behaviour).

If you know the IP of the next hop router and if that router has not been
instructed to ignore ICMP requests, ping might help. If you don't know
the IP, pinging to the subnet broadcast will also do.

Ramin

> 
> -- 
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> 
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