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Date: Mon, 09 Aug 2010 16:33:35 +0400 From: Nikita Rastegaev <Nikita.Rastegaev@...etlabs.ru> To: <linux-kernel@...r.kernel.org> Subject: Multicast MAC when sending via gateway I observe some strange behavior when sending multicast datagrams via gateway. It appears that destination MAC in UDP packets differs when using connected and connectionless socket. In case of connectionless socket destination MAC field of UDP header is filled with MAC address of gateway, but in case we use connect() with multicast address, destination MAC is set to multicast MAC. I don't know, which behavior is right, but different behavior seems strange. I run the attached test on thorin1 machine and use thorin2 as a gateway. thorin1 is running 2.6.26-2-686 kernel, thorin2 is 2.6.26-2-amd64. I also attach ifconfig and route output for this machines and tcpdump output on thorin2 when running test. There we can see the following: 16:02:30.567909 00:27:0e:09:01:2a > 00:27:0e:09:02:2a, ethertype IPv4 (0x0800), length 58: 10.54.10.1.40074 > 237.92.130.210.51721: UDP, length 16 16:02:30.567984 00:27:0e:09:01:2a > 01:00:5e:5c:82:d2, ethertype IPv4 (0x0800), length 74: 10.54.10.1.43360 > 237.92.130.210.51721: UDP, length 32 Is it a bug or is this kind of behavior expected? I wish to be personally CC'ed the answers/comments posted to the list in response to this posting. Nikita Rastegaev <Nikita.Rastegaev@...etlabs.ru> Content of type "text/plain" skipped Content of type "text/plain" skipped Content of type "text/plain" skipped Content of type "text/plain" skipped Content of type "text/plain" skipped Content of type "text/plain" skipped
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