[TriLUG] traceroute works, ping and tcp services don't get through

[Joseph Mack NA3T]

On Fri, 18 May 2012, Michael Hrivnak wrote:

> As Alexey said, UDP and ICMP are different protocols.  A big
> distinguishing characteristic is that UDP has a concept of ports
> (similar to TCP), but ICMP does not.

so traceroute uses UDP packets, not ICMP. This might explain 
why I haven't been seeing UDP packets in my iptables LOGs 
when I expect them, and why I'm seeing UDP packets between 
high ports (34xxx) that I can't account for.

Thanks for the explanation

Joe

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Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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