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Differential D50071

igmp: apply net.inet.igmp.default_version to existing interfaces
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Authored by kp on Apr 29 2025, 2:29 PM.
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rGd2c2d6d6b09e: igmp: apply net.inet.igmp.default_version to existing interfaces
Summary

IGMP requires hosts to use the lowest version they have seen on the network.
When net.inet.igmp.default_version is changed, we do not change IGMP
version used by interface even if the interface use an higher version than
V_igmp_default_version. So we could send IGMPv3 even if the user has requested
IGMPv2 or IGMPv1 via the sysctl.

Change IGMP version for each interface when V_igmp_default_version is smaller
than the version used by the interface.

Pull Request: https://github.com/freebsd/freebsd-src/pull/1615

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rG FreeBSD src repository
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sys/
netinet/
33 lines

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sys/netinet/igmp.c

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