Never heard tracert/traceroute may use udp ...
Tracert
Determines the path taken to a destination by sending
Internet Control Message Protocol (ICMP) Echo Request
messages to the destination with incrementally
increasing Time to Live (TTL) field values. The path
displayed is the list of near-side router interfaces
of the routers in the path between a source host and a
destination. The near-side interface is the interface
of the router that is closest to the sending host in
the path. Used without parameters, tracert displays
help
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/prodtechn...
The most well-known uses of ICMP are the ping and
traceroute (tracert in Window) commands. The ping
command sends out a special ICMP echo request message
to a destination. If the destination is alive, it will
respond with the ICMP echo replay message. This is a
fundamental tool used in network troubleshooting, as
described in Section 67. Handy Unix Network
Troubleshooting Commands.
Traceroute uses the Timestamp services of ICMP to
perform its task of tracing a route to a destination.
The Timestamp message and Timestamp Reply measure the
round trip time that is taken to go from the source to
the destination. Traceroute lists the path and the
round trip time to each router, taken from the source
to the destination. An example of traceroute is
described in Section 67.
http://www.thelinuxreview.com/howto/intro_to_networking/c7632.htm
Martin
.
--- Fabio De Francesco
I'm having a problem with traceroute. When I run it (e.g. traceroute weblore.com), it pauses for a bit, then prints out a series of hops with absolutely no information. After a bit, it repeats
On Wednesday 30 April 2003 12:52, Michael Satterwhite wrote: this. Here's a sample
output:
linux:/home/michael # traceroute weblore.com traceroute to weblore.com (198.65.246.22), 30 hops max, 40 byte packets 1 * * * 2 * * * 3 * * * 4 * * * 5 * * * 6 * * *
Is there something I'm missing?
Traceroute obtains '*' when some routers along the path to destination are configured to silently drop ICMP request with TTL set to '0'. Tracert uses the UDP protocol to solicitate some response from the same hops, so it's possible that it gets answers while traceroute doesn't. I know there's a patch on the wild to be applied to traceroute that allows you to choose whether you want to use ICMP or UDP protocols (Tracert standard) Regards, Fabio De Francesco.
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