IP_MAX_MEMBERSHIPS story.

Tue May 9 13:15:21 UTC 2006

On Tue, May 09, 2006 at 01:28:01PM +0100, Bruce M Simpson wrote:
> A user recently reported a problem with running into IP_MAX_MEMBERSHIPS
> on a system running FreeBSD with IPv4 forwarding enabled, and running
> the OSPF routing protocol.

More background. People may be wondering why this is even an issue for
FreeBSD as a router.

The answer: the imo_membership array contains members which exist
as separate entries for each ifnet in the system, and the system where
this was observed to be a problem had a number of ifnet interfaces
which was larger than IP_MAX_MEMBERSHIPS (20).

Regards,
BMS