Cisco 803 wont disconnect (update)

Discussion in 'Cisco' started by Peter, Dec 1, 2003.

  1. Peter

    Peter Guest

    Hi,

    Recently, following a change of ISP, I have had the 803 (ISDN) staying
    online for up to 10 hrs, despite a 200sec timeout.

    This is even with NO ethernet connection, so obviously something
    external is causing it - but presumably whatever it is is causing the
    router to reply with something and that 'something' is what is
    reloading the hangup timer.

    After a lot of help from usenet, I put it a very restricted access
    list:

    access-list 100 permit tcp any any eq www
    access-list 100 permit udp any any eq domain
    access-list 100 permit tcp any any eq domain
    access-list 100 permit tcp any any eq nntp
    access-list 100 permit tcp any any eq smtp
    access-list 100 permit tcp any any eq pop3
    (no deny statements; deny is implicit)

    which worked fine for www and email, but the router would hang up
    during ftp downloads. The following was added:

    access-list 100 permit tcp any any eq ftp
    access-list 100 permit tcp any any eq ftp-data

    which didn't help (the ftp is ws-ftp, *not* using passive mode)

    The following fixed it

    access-list 100 permit tcp any any established

    but now the router again stays online for ages...

    In addition I have

    no ip unreachables

    under both BRI0 and Dialer1 but this never made any difference.

    Can anyone suggest an 'ftp-permit' access list which isn't as wide
    open as the 'established' one?

    I can get around this by running some 'keep alive' program (e.g.
    checking the pop mailbox, or hitting some website, every 150 secs)
    during ftp transfers - not a great solution.

    Suprisingly there appears to be little on the Cisco website dealing
    with what must be a common problem nowadays.



    Peter.
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    Peter, Dec 1, 2003
    #1
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