multicasting: IP_MULTICAST_LOOP & ttl==0 bug?

DISCUSSION Yuri 1 participant 1 message Jul 13, 2001

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Yuri

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2001-07-13 19:06 UTC #0 lore raw

Hi.

I seem to have found out that depending on whether or not multicast loopback is enabled outgoing multicast packets with ttl set to 0 are treated differently.

In both cases I set ttl of outgoing packets to 0 (with IP_MULTICAST_TTL setsockopt). If multicast loop is enabled, packets remain local for the machine and are not sent onto the wire (expected behavior). However, if I disable multicast loopback, packets with ttl 0 show up on the wire. Is this a bug or I'm missing something?

Kernel version is 2.4.3-12.

Thanks,

-Yuri

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