Date: Tue, 17 Jul 2001 14:00:07 -0700 (PDT) From: "Daniel C. Sobral" <dcs@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/netinet ip_output.c Message-ID: <200107172100.f6HL07q82265@freefall.freebsd.org>
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dcs 2001/07/17 14:00:07 PDT
Modified files:
sys/netinet ip_output.c
Log:
(forced commit for more info on the previous change)
According to RFC 1112, which deals with multicasting, an application must
specify the interface on which it wished to send a multicast packet. In the
absence of such an interface, a default is selected.
Previous behavior in ip_output.c erroneously checked for a route to the
destination multicast address, rejecting the packet if none existed.
Applications got around this with a FAQ recommending a 224.0.0.0/29 route
to loopback. This worked because the multicast code in ip_output.c discards
route information if an interface was selected.
The previous commit skips the route check in the case where a multicast packet
is being send to an application-defined interface.
The only change in behavior, if no bugs were introduced, is the lack of
rejection of a multicast packet for which no route exists sent to an
application-defined interface.
MFC after: 2 weeks
Revision Changes Path
1.129 +1 -1 src/sys/netinet/ip_output.c
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