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Old 12-06-2006, 10:54 AM   #1
dav_y2k
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Registered: Apr 2005
Distribution: RedHat
Posts: 16

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tracert/traceroute


Hi all,
I have a small lab at home where I have a linux box (Fedora core 5) running iptables everything works accordingly but I noticed the following:

when I do a tracert from a windows machine I get
C:\Documents and Settings\Administrator>tracert www.google.com

Tracing route to www.l.google.com [66.102.7.99]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms 10.10.1.1
2 * * * Request timed out.
3 * * * Request timed out.
4 14 ms 15 ms 15 ms 221.184.12.65
5 16 ms 16 ms 17 ms 125.206.149.241
6 15 ms 14 ms 14 ms 60.37.11.37
7 17 ms 15 ms 15 ms 210.254.188.197
etc...

but on the linux box I get the following:

[root@ADONAI ~]# traceroute www.google.com
traceroute to www.google.com (66.102.7.147), 30 hops max, 40 byte packets
1 * * *
2 * * *
3 * * *
4 * * *
5 * * *
6 * * *


can anyone explain why??

thanks in advance.
 
Old 12-06-2006, 11:25 AM   #2
amitsharma_26
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Registered: Sep 2005
Location: New delhi
Distribution: RHEL 3.0/4.0
Posts: 777

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Because with windows, tracert send icmp echo requests with small ttl values which further goes through your router & get reponse back with icmp type 11 replies But on the other side while you do traceroute from linux, it sends udp packets from source with small ttl values & further the router respond with icmp time exceeded replies (type 11).

So probably your iptables will be blocking udp packets & hence its not working in the latter case.
 
  


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