Date: Fri, 07 Apr 2000 13:06:47 +0100 From: Tony Finch <dot@dotat.at> To: jgreco@ns.sol.net Cc: isp@freebsd.org Subject: Re: flat network Message-ID: <E12dXXD-0005UH-00@fanf.eng.demon.net> In-Reply-To: <200004090128.UAA92724@aurora.sol.net> References: <38ECE636.CE86D01C@nyi.net>
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Joe Greco <jgreco@ns.sol.net> wrote: > >If you have one router and one machine on a network, with ARP you still have >the potential to have as many ARP entries as you do virtual servers. If you >would like a practical demonstration of why this is bad, go generate about >65,000 virtual servers on such a machine, and then ask for stuff from all of >them. Note the behaviour of the ARP cache on your routers and switches. >The behaviour is O(N), and you are screwed when N exceeds the capacity of >the ARP table on the device. God forbid you've more than one server on the >net! We put all our IP aliases on the loopback interface to avoid the ARP problem. The patch in PR#12071 is handy too. Tony. -- f.a.n.finch fanf@demon.net dot@dotat.at 397 tundra clump under-scrub To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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