Are ICMP packets important?

[Chuck Hallenbeck]

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More info:

Well, I did a traceroute to yahoo.com and my mystery IP showed up
as the first stop on the way.

Next I did an 'nmap' on that address and found that all its ports
were closed except 23, telnet.

So, ..., naturally I did a telnet to the address, and got a
welcome screen from my ISP warning me about unauthorized access
under major penalties etc. etc. etc.

So my mystery IP is evidently on the other end of my wire from
the cable modem to the ISP, and since I can ping that address and
nothing beyond it, I guess that answers my question. I conclude
from this that my firewall is not at fault after all, and that my
ISP is blocking type 8 icmp packets originating with me, but not
those originating elsewhere, and not type 0 packets either, since
I have to be able to generate those in response to you folks
pinging me.

I guess that's all I can do with this problem for now. Thanks to
all for your help. I have learned a lot trying to puzzle this
out.

Chuck


- -- 
The Moon is Waning Gibbous (59% of Full)
In a world without Fences or Walls no one needs Windows or Gates.
My home page is now at http://www.mhcable.com/~chuckh
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