Date: Thu, 04 Jan 2001 14:49:15 -0800 From: Wilbert de Graaf <wilbertdg@hetnet.nl> To: net@freebsd.org Subject: igmp and if_down() Message-ID: <3A54FDEB.FB442E82@hetnet.nl>
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Some time ago I worked on an implementation of IGMPv3 on FreeBSD. Somebody I know is using it to test his router implementation on a terminal / ppp server. He told me the following: * a socket subscribes to some group on the ppp interface, and he sees IGMP reports * hangs no up, and dials in again and the IGMP messages continue He thinks this is not okay, but I'm not sure. You could argue that membership on a non-existing interface is impossible. On the other hand, it's get more complicated if you do remove membership: are you going to inform those sockets on which you removed their membership ? What do you think ? Btw. When I looked at the code I came as far as net/if.c in the fucntion if_down(). The documentation says that protocols should be informed here. I took a peek at the Linux code and they do notify IGMP, which removes all memberships on the interface that's going down. Wilbert To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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