From owner-freebsd-net@FreeBSD.ORG Sun Apr 4 14:27:35 2004 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0BC8D16A4CE for ; Sun, 4 Apr 2004 14:27:35 -0700 (PDT) Received: from sccrmhc11.comcast.net (sccrmhc11.comcast.net [204.127.202.55]) by mx1.FreeBSD.org (Postfix) with ESMTP id 94BD043D39 for ; Sun, 4 Apr 2004 14:27:34 -0700 (PDT) (envelope-from berhart@erhartgroup.com) Received: from cocaine.erhartgroup.com (c-67-166-0-138.client.comcast.net[67.166.0.138]) by comcast.net (sccrmhc11) with SMTP id <2004040421273301100c8is9e>; Sun, 4 Apr 2004 21:27:33 +0000 Message-Id: <6.0.2.0.2.20040404152043.01c83320@mx1.erhartgroup.com> X-Sender: berhart%erhartgroup.com@mx1.erhartgroup.com (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 6.0.2.0 Date: Sun, 04 Apr 2004 15:27:41 -0600 To: freebsd-net@freebsd.org From: Brandon Erhart Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Subject: FIN_WAIT_[1,2] and LAST_ACK X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Apr 2004 21:27:35 -0000 Hello everyone, I am writing a network application that mirrors a given website (such as a suped-up "wget"). I use a lot of FDs, and was getting connect() errors when I would run out of local_ip:local_port tuples. I lowered the MSL so that TIME_WAIT would timeout very quick (yes, I know, this is "bad", but I'm going for sheer speed here), and it alleviated the problem a bit. However, I have run into a new problem. I am getting a good amount of blocks stuck in FIN_WAIT_1, FIN_WAIT_2 or LAST_ACK that stick around for a long while. I have been unable to find must information on a timeout for these states. I came across a small patch that modified tcp_timer.c in /usr/src/sys/netinet. It changed line #484 (in FreeBSD 4.9-REL) from: if (tp->t_state != TCPS_TIME_WAIT && to if (tp->t_state < FIN_WAIT_2 && I also tried changing that to ".. <= FIN_WAIT_2 .." However, I still end up with quite a few stuck in FIN_WAIT_1, FIN_WAIT_2 or LAST_ACK after the program exits (and whilst the program is running of course). They don't seem to timeout in the same interval that TIME_WAIT does. Any ideas? Did I modify the right piece of code? I was told to post here as you all would more than likely know! I am stumped. Thank you all in advance, Brandon