Quoting Bruce Simpson <b...@incunabulum.net> (from Thu, 15 Apr 2010
18:10:04 +0100):
On 04/10/10 13:05, Bruce M Simpson wrote:
Log:
Fix a few issues related to the legacy 4.4 BSD multicast APIs.
IPv4 addresses can and do change during normal operation. Testing by
pfSense developers exposed an issue where OpenOSPFD was using the IPv4
address to leave the OSPF link-scope multicast groups on a dynamic
OpenVPN tun interface, rather than using RFC 3678 with the interface
index, which won't be raced when the interface's addresses change.
I should point out that IP multicast is counter-intuitive in many
areas. It seems that knowledge of how to work with it effectively is
not that widespread. People who have a need to use it, often have
very specific requirements.
IP multicast group membership is always scoped to physical links
[1]. The 4.4BSD API originally used the "primary IP address" to
identify each link. Unfortunately this is not a persistent
identifier, especially so in the use-case which had problems.
Is/was this the reason why multicast does not work in jails?
In the updated API specified in RFC 3678, the primary key for
multicast memberships, changes to the interface index. routed(8) in
FreeBSD's SVN tree uses this new API; thanks to phk for reviewing
and testing my change.
Will this change make it possible to use multicast in jails now?
Bye,
Alexander.
--
Dentist, n.:
A Prestidigitator who, putting metal in one's mouth,
pulls coins out of one's pockets.
-- Ambrose Bierce, "The Devil's Dictionary"
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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