From owner-freebsd-questions Fri Nov 13 07:43:22 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id HAA21550 for freebsd-questions-outgoing; Fri, 13 Nov 1998 07:43:22 -0800 (PST) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from relay.ucb.crimea.ua (relay.ucb.crimea.ua [194.93.177.113]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id HAA21492 for ; Fri, 13 Nov 1998 07:42:07 -0800 (PST) (envelope-from ru@ucb.crimea.ua) Received: (from ru@localhost) by relay.ucb.crimea.ua (8.8.8/8.8.8) id RAA12139; Fri, 13 Nov 1998 17:40:15 +0200 (EET) (envelope-from ru) Date: Fri, 13 Nov 1998 17:40:15 +0200 From: Ruslan Ermilov To: Stephen Derdau Cc: "FreeBSD .org" Subject: Re: NAT , I think :-) , I hope Message-ID: <19981113174015.A4973@ucb.crimea.ua> Mail-Followup-To: Stephen Derdau , "FreeBSD .org" References: <364B673B.2CC1EE5A@ne.mediaone.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.94.15i In-Reply-To: <364B673B.2CC1EE5A@ne.mediaone.net>; from Stephen Derdau on Thu, Nov 12, 1998 at 05:54:51PM -0500 X-Operating-System: FreeBSD 2.2.7-STABLE i386 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, Nov 12, 1998 at 05:54:51PM -0500, Stephen Derdau wrote: > I'm trying to determine a problem which I believe > has something to do with NAT. > > What's happening is connections are being cut off > or dropped sporadically during the day. > > Is there a setting or something in NAT that can > be adjusted...My hunch is that the connections could > be timed out . All 20-30 connections are running > through the same system..... > > Any pointers suggestions appreciated. > I'm searching the net and also FreeBSD.org's search > page. Hoping to find something that will give me a clue ! > :-) > > Thanks !1! According to libalias(3), section A.2: * A.2 Static and Dynamic Links * Aliasing links can either be static or dynamic. Static links persist in- * definitely and represent fixed rules for translating IP packets. Dynamic * links come into existence for a specific TCP connection or UDP transac- * tion or ICMP echo sequence. For the case of TCP, the connection can be * monitored to see when the associated aliasing link should be deleted. * Aliasing links for UDP transactions (and ICMP echo and timestamp re- * quests) work on a simple timeout rule. When no activity is observed on a * dynamic link for a certain amount of time it is automatically deleted. * Timeout rules also apply to TCP connections which do not open or close * properly. Timeout values are defined as follows: #define ICMP_EXPIRE_TIME 60 #define UDP_EXPIRE_TIME 60 #define TCP_EXPIRE_TIME 90 NATd uses default values. Hope this will help you a bit. Best regards, -- Ruslan Ermilov Sysadmin and DBA of the ru@ucb.crimea.ua United Commercial Bank +380.652.247.647 Simferopol, Ukraine http://www.FreeBSD.org The Power To Serve http://www.oracle.com Enabling The Information Age To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message