[Users] Re: [Bugs] Intermittent problems with ipsec connection between cisco 515 and Linux.

From: Michael Richardson (mcr_at_sandelman.ottawa.on.ca)
Date: Mon Oct 28 2002 - 15:29:50 CET


>>>>> "m" == m <Fredrik> writes:
    m> We have a tunnel from:
    m> Linux FreeS/WAN 1.98b
    m> Linux version 2.4.9-34custom (root_at_jen) (gcc version 2.96 20000731 (Red
    m> Hat Linux 7.1 2.96-98)) #1 Fri Aug 9 16:55:58 CEST 2002

    m> to

    m> Cisco pix 515

    m> it works perfectly most of the time. But sometimes the other end
    m> (the cisco people) claims that the tunnel is down. If I execute
    m> ipsec auto --down tunnel
    m> ipsec auto --up tunnel

    m> it starts to work again. And sometimes it starts to work again
    m> by itself.

The cisco PIX has some keepalive options. See if they are on, and have the
PIX turn it off.
Do a tcpdump of udp port 500. You'll probably see occasional ISAKMP messages.

It would start again when pluto decides to rekey the ISAKMP SA, which is
every hour by default.

] ON HUMILITY: to err is human. To moo, bovine. | firewalls [
] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[
] mcr_at_sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
] panic("Just another Debian GNU/Linux using, kernel hacking, security guy"); [
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