Odd tcp dump? was: ssh working with dialup, not through router

From: M. Fioretti (mfioretti_at_mclink.it)
Date: 05/15/04

  • Next message: David L Norris: "Re: Wine, why can't I get it to work" 
    Date: Sat, 15 May 2004 23:51:31 +0200
To: For users of Fedora Core releases <fedora-list@redhat.com>

    Hello,

    still trying to track why ssh doesn't work anymore, see my original
    posting.

    the PC is192.168.1.2 and the ADSL router 192.168.1.1. I have run
    tcpdump on the PC eth0 interface, while the ssh connection
    freezes, and found that, at a certain point:

    1) the PC asks the DNS server (if I understand correctly) about the
    router:

    192.168.1.2.1047 > ammi.mclink.it.domain: 22723+ PTR? 1.1.168.192.in-addr.arpa. (42) (DF)
    ammi.mclink.it.domain > 192.168.1.2.1047: 22723 NXDomain 0/1/0 (119)

    2) after that PC and router start to ask each other their ethernet
    addresses ("arp who-has 192.168.1.2 tell 192.168.1.1" and the related
    arp replies) and viceversa, repeatedly.

    3) when this happens, the pc and the ssh server seem to also go in a
    loop, which eventually times out: several equal lines in the dump,
    like:

    23:27:10.780631 192.168.1.2.1772 > ssh.server.io.ssh: . ack 2096 win 8832 <nop,nop,timestamp 474677 141420442,nop,nop,sack sack 1 {2048:2096} > (DF) [tos 0x10]

    Is 3) caused by 1) and 2)?

    are 1) and 2) normal?

    if they are not normal and causing ssh to freeze, how to fix them?

    TIA,
            Marco F. 

    -- 
Marco Fioretti                 m.fioretti, at the server inwind.it
Red Hat for low memory         http://www.rule-project.org/en/
In a [wired by the Internet] mass media world, there is *less*  of
everything except the top ten books, records, movies, ideas.
                               -- Michael Crichton, "The Lost World"
-- 
fedora-list mailing list
fedora-list@redhat.com
To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
  • Next message: David L Norris: "Re: Wine, why can't I get it to work"

    Relevant Pages