Messages in this thread | | | From | Russell Miller <> | Subject | udp traceroute dropping packets | Date | Thu, 15 Apr 2004 21:55:13 -0500 |
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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! -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux)
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