Date: Mon, 07 Jan 2008 03:03:11 +0600 From: "Vadim Goncharov" <vadim_nuclight@mail.ru> To: "Julian Elischer" <julian@elischer.org>, "Bruce M. Simpson" <bms@freebsd.org> Cc: arch@freebsd.org, Qing Li <qingli@freebsd.org>, Ivo Vachkov <ivo.vachkov@gmail.com>, Robert Watson <rwatson@freebsd.org>, FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: resend: multiple routing table roadmap (format fix) Message-ID: <opt4i0rlz317d6mn@nuclight.avtf.net> In-Reply-To: <4781197F.1000105@elischer.org> References: <4772F123.5030303@elischer.org> <f85d6aa70712261728h331eadb8p205d350dc7fb7f4c@mail.gmail.com> <477416CC.4090906@elischer.org> <opt4c0imk24fjv08@nuclight.avtf.net> <477D2EF3.2060909@elischer.org> <opt4g4kcis17d6mn@nuclight.avtf.net> <4780E5E7.2070202@FreeBSD.org> <4781197F.1000105@elischer.org>
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07.01.08 @ 00:10 Julian Elischer wrote: >>> Is multicast and multipath routing the same? >> No. They are currently orthogonal. >> However it makes sense to merge the multicast and unicast forwarding >> code as currently MROUTING is limited to a fan-out of 32 next-hops >> only. In multicast, next-hops are normally just interfaces. >> Also the IETF MANET ad-hoc IP is going to need hooks there; multicast >> in MANET needs to address its next-hops by their unicast address, and >> encapsulate the traffic with a header. This is not true link layer >> multicast -- although it might use link layer multicast to leverage the >> hash filters in 802.11 MACs. >> As regards getting ARP out of forwarding tables, this should have >> happened a long time ago... > > I'm not 100 % convinced of this... > I was, but I think there may still be a place for a cached arp pointer > in hte next hop route to the arp entry for that next hop. > I DO however thing that the arp stuff should nto be accessing its > data via the routing table. Surely, routing table should contain a cached pointer to an entry in L2 table (ARP in case of Ethernet), to not do double lookups. But still separate those tables... -- WBR, Vadim Goncharov
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