donna garverick wrote:

> www.hp.com is a tough cookie (is that a pun?). if you do a lookup on
> it, you'll see two ip addresses.  i don't know what that will do to
> tracert.  given that i can't tracert to jazz, it makes me wonder if hp
> isn't doing some sort of filtering -- anti-DoS stuff.      - d

tracert will pick the first one returned.

As to blocking/not working, it depends on the firewall and depends on the traceroute, and I confess I don't know how the 3000 does it.

Traceroute works by sending out "a packet" to the target with an incrementing TTL value and looks for responses, generally ICMP unreachable - TTL exceeded on all hops except the last, or an ICMP port unreachable if it made it all the way.

Traditional traceroutes use a UDP packet to a high-numbered port.

Windows traceroute uses an ICMP traceroute packet.

Firewalls may block any of those packets coming or going.

Jeff

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