Thread: Packet Loss ?!?
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Old 13-02-2005, 10:30   #27
ian@huth
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Re: Packet Loss ?!?

Quote:
Originally Posted by Horace
So you think hop 8 looks fine ?

204 ms * 168 ms tele-ic-2-so-100-0.inet.ntl.com [62.253.185.74]
It's the last hop that is the important one. A tracert basically sends a ICMP packet to the required site with a TTL=1 (Time To Live) followed by one with TTL=2, increasing by 1 until the destination is reached or the maximum TTL value set is reached. Routers along the route will send back a "TTL expired in transit" message if the TTL field has reached zero by the time it hits that router thus building up the route taken until the final destination has been reached. As many routers give ICMP packets low priority this can show a result similar to hop 8 that you refer to. As the TTL is increased so that it is not zero when it reaches hop 8, that router gives the packet an higher priority meaning all is well after it.
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