From owner-freebsd-hackers Wed Apr 25 10:19: 3 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from sdf.lonestar.org (t3-d-static-237.adsl.directlink.net [63.68.131.237]) by hub.freebsd.org (Postfix) with ESMTP id B7AC037B424; Wed, 25 Apr 2001 10:18:56 -0700 (PDT) (envelope-from brune@sdf.lonestar.org) Received: (from brune@localhost) by sdf.lonestar.org (8.11.0/8.11.0) id f3PHHv716968; Wed, 25 Apr 2001 17:17:57 GMT Message-Id: <200104251717.f3PHHv716968@sdf.lonestar.org> Subject: Re: TCP SYN retransmission time To: agoodloe@gradient.cis.upenn.edu (Alwyn Goodloe) Date: Wed, 25 Apr 2001 17:17:57 +0000 (GMT) From: "Corey Brune" Cc: freebsd-questions@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG In-Reply-To: from "Alwyn Goodloe" at Apr 25, 2001 11:06:23 AM MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 75 is the timeout. If the sending host does not receive a ACK before 75 seconds, then the host will receive an error. The retransmit times I believe are 3,11,30,60 seconds apart. I hope this answers your question. Corey Alwyn Goodloe > > I got no response on a previous posting hope I second post will be > luckier. > > -------------------- > > I just need to make sure that I understand the code correctly in the TCP > stack. (We are trying to see how long the system waits before a SYN gets > retransmitted.) > > When a SYN is sent, a keepalive timer is set with using the > TCPTV_KEEPALIVEINTVL = 75hz (??ms - escapes me at the moment). So an ack > must be received in this time frame??? > > This is not the usual dynamic tetransmission timer which might make > sense for SYN packts. > > It seems like a retransmission timer should be set?? That's why I'm > posing the question. > > Alwyn Goodloe > agoodloe@gradient.cis.upenn.edu > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message