Better way to rejoin multicast groups on a lost PPP link?

From: Tuan Hoang (tuan@optimus.mitre.org)
Date: Mon Feb 14 2000 - 09:41:39 EST


Hi,

I've currently got my RH 6.1 box with a PPP (null modem) to a Solaris
x86 7 box. For simulation purposes, I've got my machine aliasing well
over a thousand IP's and I'm joining about 300 multicast groups on the PPP
device ppp0. When the Solaris box reboots and shuts down its end of the
PPP (detected via pings; is there a better way for this too?), pppd
re-establishes the PPP, and I re-alias all the IP's and try to rejoin all
the multicast groups. The re-aliasing works fine but for some reason I
only rejoin 220 of the 300 multicast groups. At least I believe this to
be so because netstat -gn shows that only 220 were rejoined.

My question is, is there something I'm doing wrong or is the kernel
not reporting all the re-joined groups in /proc/net/igmp ?
Do I even have to rejoin all the groups and redo all the IP aliases?

BTW, I'm not allowed to alias the addresses on my ethernet card instead of
the PPP device.

Thanks,
Tuan

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