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/freebsd-10.0-release/sys/netinet/
H A Din.cdiff 168032 Thu Mar 29 19:39:22 MDT 2007 bms Fix a bug in IPv4 address configuration exposed by refcounting.
* Join the IPv4 all-hosts multicast group 224.0.0.1 once only;
that is, when an IPv4 address is first configured on an interface.
* Do not join it for subsequent IPv4 addresses as this violates IGMP.
* Be sure to leave the group when all IPv4 addresses have been removed
from the interface.
* Add two DIAGNOSTIC printfs related to the issue.

Further care and attention is needed in this area; it is suggested that
netinet's attachment to the ifnet structure be compartmentalized and
non-implicit.

Bug found by: andre
MFC after: 1 month

Completed in 97 milliseconds