Discussion:
Traceroute doesn't works but pinging of destination works
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Muruganandam Chandrasekaran
2010-10-26 05:03:24 UTC
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Hi All,

I just need to know reason behind this.

I am able to ping the destination of same network

but i am not able to traceroute a destination. what would be a reason
behind this.

Thanks
Regards
Muruganandam C
Scott Lurndal
2010-10-26 17:57:08 UTC
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Post by Muruganandam Chandrasekaran
Hi All,
I just need to know reason behind this.
I am able to ping the destination of same network
but i am not able to traceroute a destination. what would be a reason
behind this.
Probably because some intermediate routers have been configured to drop
ICMP packets whose TTL expired on ingress.

scott
Moe Trin
2010-10-26 20:15:25 UTC
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On Tue, 26 Oct 2010, in the Usenet newsgroup comp.os.linux.redhat, in article
Post by Muruganandam Chandrasekaran
I just need to know reason behind this.
Not enough detail, and what information is there is ambiguous
Post by Muruganandam Chandrasekaran
I am able to ping the destination of same network
but i am not able to traceroute a destination. what would be a reason
behind this.
Depends. What version of traceroute? What options used? What
firewall rules on both systems? Any routers involved - if so, what
forwarding rules?

Start by reading RFC0792 which you can find using any search engine

0792 Internet Control Message Protocol. J. Postel. September 1981.
(Format: TXT=30404 bytes) (Obsoletes RFC0777) (Updated by RFC0950,
RFC4884) (Also STD0005) (Status: STANDARD)

Then study the rather extensive man page for traceroute

[compton ~]$ whatis traceroute
traceroute (8) - print the route packets take to network host
[compton ~]$

The page for the Van Jacobson version from LBL is about 330 lines or
about 5 1/2 pages complete with a lot of examples. Then fire up a
packet sniffer such as

Accurate Network Monitor EtherDetect Packetyzer
AiroPeek EtherPeek PRTG
Analyzer Ettercap Sniff'em
Anasil GreedyDog Snoop
CommView IPDump2 TracePlus/Ethernet
dSniff LinkFerret WinDump
EtherApe OmniPeek Wireshark

or the UNIX standard grand-daddy of them all

[compton ~]$ whatis tcpdump
tcpdump (8) - dump traffic on a network
[compton ~]$

Old guy

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