Problem with closing tcp session between cisco and freebsd
tolyar at mx.ru
Tue Mar 16 04:18:34 PST 2004
On Tue, 16 Mar 2004 11:29:45 +0000 (UTC)
"Bjoern A. Zeeb" <bzeeb-lists at lists.zabbadoz.net> wrote:
> > > FreeBSD 4.9-STABLE cvsupped March 3
> > > Cisco IOS 12.2.19a ip only Cisco 5300
> > Do you know when it was working correctly the last time? Do you have
> > another machine (4.9R or lower, or 5.2 or 5.C) to test against? On
> > March 2 the commit of the TCP segment reassembly queue limiter has
> > been done but that does not change TCP processing otherwise in any
> > way. A month ago the TCP-MD5 stuff has been committed. A year ago
> > there have been some NewReno fixes.
> > So no obvious suspect. Before digging deep into the code its better
> > to have some more surrounding information.
> Another question: any packet filters in between ?
Yes i have IPFW1 on this servers (it was the same problem on two servers at one time and one cisco)
But in IPFW i have ACCEPT by default and only this deny rules:
00200 deny ip from any to 127.0.0.0/8
00300 deny ip from 127.0.0.0/8 to any
00400 deny log logamount 100 tcp from any to any 135-139,445,593
00500 deny log logamount 100 udp from any to any 135-139,445
01100 deny tcp from any to any 22 in recv fxp1
01600 reset tcp from any to any 113
I make ipfw flush when i see this situation and keep only
65535 allow ip from any to any
but problem was not resolved and tcp session not ended.
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