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List:       linux-kernel
Subject:    udp traceroute dropping packets
From:       Russell Miller <rmiller () duskglow ! com>
Date:       2004-04-16 2:55:13
Message-ID: 200404152155.18724.rmiller () duskglow ! com
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I came across this archived linux-kernel message:

http://www.uwsg.iu.edu/hypermail/linux/net/0007.2/0111.html

I am having the exact same problem as is outlined there, from a post three 
years ago.  Here's a summary:

"I think I've found a bug in UDP/ICMP code in the kernel using 
 traceroute. 
 
To reproduce: Launch traceroute -n to some Linux system nearby 
 really quickly 3 times in the row; localhost won't work, it has to go 
 through network. Quick response is crucial. I used systems w/ in 
 the same physical network and a few routers between (still < 5 ms 
 response). 
 
The effect: On third traceroute (or perhaps second/first, if you're quick 
 enough), ICMP port unreachable will not be sent to the UDP datagram. "

I reproduced this on a redhat 8.0 machine running kernel 2.4.23.  Changing to 
the -I option of traceroute (to use ICMP) works flawlessly.  I'll be glad to 
provide more information if you need it.  Please CC, as I'm not subscribed.

- --Russell
- -- 

Russell Miller - rmiller@duskglow.com - Somewhere near Sioux City, IA.
Youth cannot know age, but age is guilty if it forgets youth
    - Professor Dumbledore
Hi! I'm a .signature virus! Copy me into your ~/.signature, please!
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