Public bug reported:
Binary package hint: traceroute
Hello Ubuntuers,
I am facing a very strange problem in the traceroute package present in
the latest Ubuntu release (Hardy).
Problem description:
Because of lots of systems blocking udp packets, I prefer to use ICMP
traceroute (the "traceroute -I" command). However I am unable to use this
command in Hardy, because instead of printing the hops properly, it prints the
first hop, then prints four lines with stars, fifth line with one star and then
continues properly. This happens only with the ICMP tracing and DNS name
resolution turned on.
Let me give you an example:
ICMP traceroute, DNS resolution turned on:
[EMAIL PROTECTED]:~$ sudo /usr/bin/traceroute -I 10.128.9.101
traceroute to 10.128.9.101 (10.128.9.101), 30 hops max, 40 byte packets
1 10.128.6.1 (10.128.6.1) 20.654 ms 35.966 ms *
2 * * *
3 * * *
4 * * *
5 * * *
6 * 10.128.9.101 (10.128.9.101) 30.744 ms 81.052 ms
ICMP traceroute, DNS resolution turned off ("-n" parameter):
[EMAIL PROTECTED]:~$ sudo /usr/bin/traceroute -n -I 10.128.9.101
traceroute to 10.128.9.101 (10.128.9.101), 30 hops max, 40 byte packets
1 10.128.6.1 16.265 ms 35.758 ms 35.788 ms
2 10.160.0.2 35.835 ms 35.845 ms 35.852 ms
3 10.160.8.5 35.785 ms 35.794 ms 35.802 ms
4 10.128.12.11 35.845 ms 35.853 ms 36.047 ms
5 10.128.9.101 36.059 ms 57.850 ms 57.872 ms
UDP traceroute, name resolution turned on:
[EMAIL PROTECTED]:~$ sudo /usr/bin/traceroute 10.128.9.101
traceroute to 10.128.9.101 (10.128.9.101), 30 hops max, 40 byte packets
1 10.128.6.1 (10.128.6.1) 16.038 ms 32.945 ms 32.958 ms
2 10.160.0.2 (10.160.0.2) 32.999 ms 33.002 ms 33.018 ms
3 10.160.8.5 (10.160.8.5) 32.929 ms 32.932 ms 32.935 ms
4 klient10.ap-pk.zebetin.brno.czf (10.128.12.11) 32.965 ms 32.982 ms
81.841 ms
5 10.128.9.101 (10.128.9.101) 81.855 ms 81.860 ms 81.864 ms
To compare, here is also a Windows ICMP traceroute, which works perfectly:
C:\Users\Radek>tracert -d 10.128.9.101
Tracing route to 10.128.9.101 over a maximum of 30 hops
1 20 ms 17 ms 18 ms 10.128.6.1
2 20 ms 28 ms 18 ms 10.160.0.2
3 29 ms 22 ms 42 ms 10.160.8.5
4 19 ms 26 ms 18 ms 10.128.12.11
5 40 ms 30 ms 38 ms 10.128.9.101
Trace complete.
And also a Mandriva traceroute (from the other side, the 10.160.8.4
router, which is connected using wired ethernet to 10.160.8.5)
[EMAIL PROTECTED] ~]# traceroute -V
Version 1.4a12
[EMAIL PROTECTED] ~]# traceroute 10.128.6.136
traceroute to 10.128.6.136 (10.128.6.136), 30 hops max, 38 byte packets
1 cisco-vlan-008 (10.160.8.1) 2.617 ms 1.692 ms 2.498 ms
2 openvpn (10.160.0.10) 0.981 ms 0.582 ms 0.640 ms
3 10.128.6.136 (10.128.6.136) 78.158 ms 102.499 ms 17.792 ms
Possible issue:
You might think of a lossy network - that is not the case. I am experiencing
this problem on every network connection in the system (tunelled, physical
wired ethernet, physical wireless ethernet), it occurs when tracing the host
over a VPN connection, over an internet connections (multiple different
providers and speeds, starting 1 Mbit, ending 100 Mbit internet connection
line), no matter what I choose, I get this strange behaviour, which already
drives me crazy.
You may say, that the routers in the middle do not send ICMP responses.
That is not the case also. I have snapped the traffic with tcpdump and
attaching it to this bug. You may notice that the hosts _do_ send ICMP
responses.
I think that this is a bug in the traceroute 2.0.X package when using
some DNS servers - it's waiting for a name resolution for too long and
in the meantime it loses the ICMP replies that come over the network.
The version concerned is:
[EMAIL PROTECTED]:~$ traceroute -V
Modern traceroute for Linux, version 2.0.9, Nov 19 2007
Copyright (c) 2006 Dmitry Butskoy, License: GPL
[EMAIL PROTECTED]:~$ dpkg --list | grep traceroute
ii traceroute 2.0.9-3
Traces the route taken by packets over an IP
[EMAIL PROTECTED]:~$ apt-cache show traceroute
Package: traceroute
Priority: optional
Section: net
Installed-Size: 192
Maintainer: Ubuntu Core Developers <[EMAIL PROTECTED]>
Original-Maintainer: Daniel Baumann <[EMAIL PROTECTED]>
Architecture: amd64
Version: 2.0.9-3
Depends: libc6 (>= 2.6.1-1)
Conflicts: traceroute-nanog (<< 6.4.2-1), traceproto (<< 1.1.2beta1-3)
Filename: pool/main/t/traceroute/traceroute_2.0.9-3_amd64.deb
Size: 51776
MD5sum: 32a60cea0662ec745d477310a7e92b64
SHA1: f5d743ed8347bae1e8a2036dd40cad78b2e8e154
SHA256: c996606b09be773c5d333d8eab64e89b9e76a2c3c3ee98602ca66c01280708d0
(...)
Bugs: mailto:[EMAIL PROTECTED]
Origin: Ubuntu
How to reproduce the bug:
Simply run sudo traceroute -I www.google.com
(the letter in the traceroute parameter is a capital i fo ICMP traceroute, not
small L)
** Affects: traceroute (Ubuntu)
Importance: Undecided
Status: New
--
ICMP traceroute does not work properly in Hardy
https://bugs.launchpad.net/bugs/269749
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