Re: do we support non contiguous netmasks ?
From: Tony Finch (dot_at_dotat.at)
Date: 04/07/04
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To: anders.lowinger@packetfront.com Date: Wed, 07 Apr 2004 11:10:58 +0100
Anders Lowinger <anders.lowinger@packetfront.com> wrote:
>Luigi Rizzo wrote:
>>
>> i was wondering if anyone knows what kind of support we have
>> in FreeBSD networking code, for non contiguous netmasks.
>> While it is trivial to support them for interface addresses,
>> managing them in the routing table is probably far from trivial
>> and I believe also mostly useless... and anyways, i have no
>> idea how our kernel code deals with them
>
>Not sure why you wonder? Do you need it?
I played around with non-contiguous netmasks when working on Demon's
NETALIAS patch (see http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/12071).
I didn't actually put it into production that way, though -- I stuck
with standard netmasks to reduce confusion.
At that time we had IIRC two /18s and a /16 assigned to a web vhosting
service (because it dated from before widespread support for HTTP Host:
headers). These addresses were allocated sequentially, so the simple
approach of splitting the /16s into /18s and routing them to the various
servers gave an uneven distribution of load. Splitting the /16s by the
mask 0xFFFF0003 did a better job. (Each server could serve any site,
but was more efficient if it served a subset of the sites, and it was
easiest to configure this distribution on the (NetBSD) last hop router.)
Tony.
-- f.a.n.finch <dot@dotat.at> http://dotat.at/ LYME REGIS TO LANDS END INCLUDING THE ISLES OF SCILLY: NORTHWEST 4 OR 5 GRADUALLY VEERING NORTH 4 OR 5. SOME SHOWERS. MAINLY GOOD. SLIGHT IN EAST, MODERATE IN WEST. _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
- Previous message: Palle Girgensohn: "Re: sk ethernet driver: watchdog timeout"
- In reply to: Anders Lowinger: "Re: do we support non contiguous netmasks ?"
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