[clue-tech] IP routing problems

[David L. Anselmi]

Angelo Bertolli wrote:
> I'm running my own box as a server at home, that I like to log into 
> remotely.  In particular, at one location I am unable to reach it.  Is 
> there any way for me to figure out what the problem is?  Both sides of 
> the connection are the same ISP.  When I do a traceroute, I get:
[...]
> 10  te-8-1-ur01.chillum.dc.bad.comcast.net (68.87.128.209)  16.318 ms  
> 18.804 ms  17.167 ms
> 11  te-9-2-ur01.rockville.md.bad.comcast.net (68.87.128.218)  21.317 ms  
> 17.867 ms  16.167 ms
> 12  * * *
> 13  pcp04370002pcs.nrockv01.md.comcast.net (69.140.216.27)  28.722 ms  

A traceroute through Qwest winds up following this path too.  Probably 
there's a filter dropping traceroute after #13.  Doesn't really tell you 
anything unless you know the hops between 13 and your server.

Various ports I tried aren't open so I'd say your problem is getting to 
the server from anywhere, not just one location.  What's traceroute say 
from a place that works?

Most likely you have a filter (firewall, NAT) blocking you from the 
server--what port do you think is open and where should it be open from?

Dave
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