Date: Tue, 30 Apr 1996 02:44:08 -0700 (PDT) From: Brian Litzinger <brian@MediaCity.com> To: angio@aros.net (Dave Andersen) Cc: freebsd-questions@FreeBSD.org Subject: Re: IP aliases and delays Message-ID: <199604300944.CAA06515@MediaCity.com> In-Reply-To: <199604300641.AAA26399@terra.aros.net> from Dave Andersen at "Apr 30, 96 00:41:22 am"
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Dave Andersen wrote:
> > Why bother? FreeBSD allows you to alias an arbitrary number of addresses
> > to an interface, so dummy interfaces are completely unnecessary.
>
> On the stupid question front, I'm wondering if anyone's actually looked
> at the kind of degredation you get with packet response times on aliased
> interfaces?
>
> To wit: On a linux 1.2.13 with aliasing, the 130th alias takes ~3ms
> longer to ping on a local ethernet than the interface address itself.
> (4.5ms vs 1.5ms). I don't have enough aliases on the freebsd boxes to
> test this (and they're 'production' so I'm not in the mood to play with
> them. :), so I'm curious if someone's actually looked at it?
ping
True Ip: 1.592ms
157th alias: 2.556ms
Machine is an P5-75 with DEC 21040 ethernet interface.
Brian Litzinger
brian@mediacity.com
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