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Posted by Billy Rubin on June 22, 2000 at 13:38:22:

In Reply to: How to Debug CF connectivity problems. posted by m00 on June 22, 2000 at 12:26:27:

> The way to found out what is problem is
> when CF appears to be down, can be done
> this way:
>
> # ping carrionfields.org
> PING carrionfields.org (216.62.186.197): 56 data bytes
> 112 bytes from adsl-216-62-186-197.dsl.hstntx.swbell.net (216.62.186.197): Destination Port Unreachable
>
> This means that the adsl connection from CF
> to the rest of the world (including you) is
> UP. Apparently some kind of packet filtering
> is in use, which rejects forwarding of icmp_echo
> packets (ping), but is humble enough to send back
> a "Port unreachable" notice.
>
> If you on the other hand recieves no answer,
> the ping packets will time out, this means
> there is a NETWORK problem, causing the packets
> never to reach the CF firewall. You can
> locate where on the net this problem is located
> by using traceroute.
>
> traceroute carrionfields.org
> traceroute to carrionfields.org (216.62.186.197), 30 hops max, 40 byte packets
> 1 blah
> 2 blah
> 3 blah
>
> eventually the last hop should appear as
>
> 21 adsl-216-62-186-197.dsl.hstntx.swbell.net (216.62.186.197) 502.821 ms (laggy) 283.390 ms 222.108 ms
>
> You will see that when CF is down, these days
> traceroute will time out at
>
> 20 rback1-fa2-0.hstntx.swbell.net
>
> which is the UPLINK for CF. This means
> that the problem is related to
>
> adsl-216-62-186-197.dsl.hstntx.swbell.net (CF wan endpoint)
>
> not being able to recieve traffic from it's
> uplink. This can be caused a bad router,
> misconfiguration, bad cobber thread, whatever
> the problem is you can conclude that it is
> not a system error on the cf box, but a problem
> that the service provider (swbell) will have
> to fix. A reboot of the router gear might fix
> the problem here and now, but most likely only
> for a short while, a solid solution will
> have to involve swbell.


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