Date: Fri, 11 Aug 2000 20:05:25 +0200 From: Gerhard Sittig <Gerhard.Sittig@gmx.net> To: freebsd-security@freebsd.org Subject: Re: Strange ipnat behaviour Message-ID: <20000811200525.D261@speedy.gsinet> In-Reply-To: <20000809153924.C18771@carroll.net>; from damien@carroll.com on Wed, Aug 09, 2000 at 03:39:24PM -0400 References: <20000809153924.C18771@carroll.net>
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On Wed, Aug 09, 2000 at 15:39 -0400, Damien Tougas wrote:
>
> [ ... ipnat on FreeBSD 3.4-Stable ... ]
>
> The problem that we are seeing is that for some reason unknown
> to us, nat just stops working. The only way to get it to work
> again is to clear the ipnat tables and rules and re-initialize
> them using the following sequence:
>
> /usr/sbin/ipnat -CF
> /usr/sbin/ipnat -f /etc/rc.nat
>
> After that, everything works just fine.
> The config file we use (rc.nat) is very simple:
>
> map de0 10.0.0.0/8 -> 0/32 portmap tcp/udp 1025:65000
> map de0 10.0.0.0/8 -> 0/32
Do you get different ip addresses and then it fails? Your
mapping to 0/32 means "use the interface's address" and won't
work when it's not any longer the address assigned at "ipnat -f"
time. Read "man ipf" and especially watch out for the -y switch.
I had to put something this way into ppp.linkup and ppp.linkdown
to make things work.
> Our first thought was that we might have ran out of ports, but
> we discovered that there were no more than about 3000 sessions
> active at the time.
So the number of ports is not a problem, but is memory? These
3000 sessions have their state to be kept somewhere. Could you
decrease the timeout to handle more connections with the same
amount of RAM?
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