Date: Fri, 12 May 2006 03:05:31 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Bruce M Simpson <bms@spc.org> Cc: freebsd-net@freebsd.org, pavlin@icir.org, atanu@icir.org Subject: Re: IP_MAX_MEMBERSHIPS story. Message-ID: <20060512030152.X20138@fledge.watson.org> In-Reply-To: <20060509131517.GB79277@spc.org> References: <20060509122801.GA65297@spc.org> <20060509131517.GB79277@spc.org>
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On Tue, 9 May 2006, Bruce M Simpson wrote: > 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). I'm loosely of the opinion that the membership array should be variable length, and that we should default it to 20, but have a significantly larger maximum. It's not horribly efficient, but also wouldn't be so particularly terrible either. Robert N M Watson
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