Date: Wed, 16 Aug 2000 02:51:23 -0700 (PDT) From: deepika kakrania <deepika_77@yahoo.com> To: freebsd-net@FreeBSD.ORG Cc: freebsd-hackers@FreeBSD.ORG Subject: Sending multicast packets Message-ID: <20000816095123.290.qmail@web3003.mail.yahoo.com>
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hi We are running freebsd 3.3 release. i am having the scenario where two daemons running on two routers which are on the same LAN have to exchange multicast packets. To test the multicasting capability, i have taken 2 sample programs. Both of them are joining same multicast group and therefrom i have considered two cases. 1)One program will send multicast packets to multicast group and other will be receiving. I ran tcpdump on both the machines to see the flow of packets. The applications are sending and receiving packets but tcpdump doesn't show any packet flow between these two. It only shows igmp report and leave packets. We could see the proper flow of packets only once using tcpdump. After that tcpdump is not showing any packet flow. 2)both programs will be sending and receiving packets.In this, both applications first join multicast group and then one application sends packet to this multicast group and other will read these packets and then will write back same packet which should be read by first application. But here, second application doesn't receive the first packet itself. Here also, tcpdump doesn't show any packets flowing between these two routers. Could someone explain to me why there is no packet flow in second case(in both directions simultaneously)? Thanks in advance. regards, deepika __________________________________________________ Do You Yahoo!? Send instant messages & get email alerts with Yahoo! Messenger. http://im.yahoo.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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