network problems?

Rui Paulo rpaulo at
Fri Apr 20 10:18:31 UTC 2007

At Thu, 19 Apr 2007 23:36:38 -0500,
Craig Boston wrote:
> On Fri, Apr 20, 2007 at 08:37:59AM +1000, Peter Jeremy wrote:
> > You could try reducing net.inet.tcp.recvspace or disabling
> > net.inet.tcp.rfc1323 and see if that helps.  (Though RELENG5 should
> > also be affected if this is the problem).
> I don't know if it's related, but I've had problems with packets to/from
> a recent -CURRENT box not being able to traverse a pf (running on
> 6.2-stable) firewall with NAT and state rules.  Some of the packets are
> dropped unless I disable net.inet.tcp.rfc1323 on the system running
> -CURRENT, enough to cause ssh connections to stall and drop before
> login.
> 6.x machines behind the same firewall work just fine.  I can provide
> tcpdump output if someone thinks it will help.

Maybe this helps.

revision 1.291
date: 2006/02/28 23:05:59;  author: andre;  state: Exp;  lines: +20 -19
Rework TCP window scaling (RFC1323) to properly scale the send window
right from the beginning and partly clean up the differences in handling
between SYN_SENT and SYN_RCVD (syncache).

Further changes to this code to come.  This is a first incremental step
to a general overhaul and streamlining of the TCP code.

PR:             kern/15095
PR:             kern/92690 (partly)
Reviewed by:    qingli (and tested with ANVL)
Sponsored by:   TCP/IP Optimization Fundraise 2005

Rui Paulo - rpaulo at

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