• Re: Traceroute doesn't works but pinging of destination works

    From Moe Trin@110:300/1.98 to All on Tue Oct 26 22:15:25 2010
    On Tue, 26 Oct 2010, in the Usenet newsgroup comp.os.linux.redhat, in article <1288069406.698154@sj-nntpcache-2.cisco.com>, Muruganandam Chandrasekaran wrote:

    I just need to know reason behind this.

    Not enough detail, and what information is there is ambiguous

    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

    --- FIDOGATE 4.4.10
    * Origin: FTN Gate on kofobbs.net (110:300/1.98)
  • From Muruganandam Chandrasekaran@110:300/1.98 to All on Tue Oct 26 07:03:24 2010
    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

    --- FIDOGATE 4.4.10
    * Origin: FTN Gate on kofobbs.net (110:300/1.98)
  • From Scott Lurndal@110:300/1.98 to Muruganandam Chandrasekaran on Tue Oct 26 19:57:08 2010
    Muruganandam Chandrasekaran <murchand@cisco.com> writes:
    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

    --- FIDOGATE 4.4.10
    * Origin: FTN Gate on kofobbs.net (110:300/1.98)