Re: Monitor path changes

On 2/26/2011 2:51 PM, Steve VanDevender wrote:
> Frank Bulk writes:
>   >  Except when you can't contact the endpoint and you wonder what hop(s) are
>   >  broken or breaking it.  Was it running along another path before that
>   >  worked...
>   >
>   >  Frank
>
> I can see wanting to monitor your own network for routing failures and
> changes in dynamic routing that might indicate problems, but if you're
> monitoring some endpoint outside your network by doing continual
> traceroutes, apart from satisfying your own curiousity I'm not sure how
> much you could use the information on path changes in networks that
> someone else is managing.  You could find that the path changes all the
> time even while connectivity remains available, or that when
> connectivity is interrupted knowing what the different paths might have
> been isn't of any use.  So maybe you could go pester some other provider
> about the network failure but that might not do anything to speed up the
> resolution.  And you couldn't even depend on traceroute output that much
> since an apparent missing hop in a traceroute doesn't necessarily mean
> that there is a failure of connectivity; maybe some router just didn't
> feel like sending an ICMP TTL exceeded back to you.

And (memories of  my small-pipe days--I remember when 56 Kb was 
HUGE--does everybody doing trace routes scale well?  Maybe IPv7 will 
have an ICMP region in the header.

-- 
Superfluity does not vitiate
California Civil Code quote-#3537

Life should not be a journey to the grave with the intention of arriving 
safely in an attractive and well preserved body, but rather to skid in 
sideways, your body thoroughly used up, totally worn out and 
screaming,"Yah hoo! What a ride!"
    ripped from "GM" Roper


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