From owner-freebsd-questions Thu Aug 20 12:17:46 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA04272 for freebsd-questions-outgoing; Thu, 20 Aug 1998 12:17:46 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from smtpgt2.oscsystems.com (smtpgt.oscsystems.com [206.0.167.10]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id MAA04243 for ; Thu, 20 Aug 1998 12:17:34 -0700 (PDT) (envelope-from Lee.David@oscsystems.com) From: Lee.David@oscsystems.com Received: by smtpgt2.oscsystems.com(Lotus SMTP MTA v4.6.1 (569.2 2-6-1998)) id 85256666.0069E3D1 ; Thu, 20 Aug 1998 15:16:36 -0400 X-Lotus-FromDomain: ORBMD To: Freebsd-questions@FreeBSD.ORG Message-ID: <85256666.0066A145.00@smtpgt2.oscsystems.com> Date: Thu, 20 Aug 1998 15:15:29 -0400 Subject: Multicast Packet size problem Mime-Version: 1.0 Content-type: text/plain; charset=us-ascii Content-Disposition: inline Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Free BSD GURU, I developed an application that does multicasting.....I am trying to send packet sizes ranging from 1000 bytes to 12,500 bytes. My test configuration consist of a receiver on one and a sender both FREE BSD ver 2.2.6. I can successfully send and receive a packet size of 1400 bytes or less, using the system calls sendto and recvfrom. However, I cannot seem to get it to work for packets larger than 1400 bytes. The symptoms of the sender are as follow - after a hundred or more packets the sendto system call returns an error code via the perror call of such "sendto: can not route to host". In addition the receiver never receives any packets at all!! FYI, I also found that if run the test with packet size greater than 1400 bytes, starting the same sender and receiver mention above in different process windows on the same machine, the sender behaves the same. However the receiver does indeed receive all packets generated by the sender!!! I have set up an SGI IRIX UNIX machine as the sender and the receiver a FREEBSD and am able to run both of the above test successfully. Your help would be greatly appreciated, I have spent a few days looking into this problem and am stumped. Sincerely, David Lee EMail: lee.david@oscsystems.com Phone: 301-353-1728 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message