SRX

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  • 1.  (DUP!) ping response

    Posted 10-19-2012 14:54

    hi all

    im ping a router on my network (srx devices),, in response of ping, i m finding (DUP!) infront of only few responses,, not for all... is it a duplicate reply from target???if yes,, what r possible reasons and how to debug into problem??? what else to check etc??? what will be its effects on my network??? and how to get rid of this issue??plz guide



  • 2.  RE: (DUP!) ping response

    Posted 10-19-2012 15:46

    That is indicative of a layer 2 problem. You may have a loop in your network. 



  • 3.  RE: (DUP!) ping response

    Posted 10-21-2012 03:51

    Hello,

    If you are pinging subnet broadcast address, then it is expected.

    Ping utility treats ICMP response with _same_ SEQ _and_ same or _different_ src.ip as duplicates.

    Example:

    - subnet 192.168.101.0/25

    - subnet broadcast ip 192.168.101.127

    - SRX interface ip 192.168.101.1

    - when pinging 192.168.101.127, you receive 3 replies:

    a) 1st from 192.168.101.2

    b) 2nd from 192.168.101.3 with _SAME_ SEQ - this will be marked as DUP!

    c) 3rd from 192.168.101.100 with _SAME_ SEQ - this will be also marked as DUP!

    HTH

    Rgds

    Alex