From owner-freebsd-net@FreeBSD.ORG  Wed Jun  9 22:19:09 2010
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From: Nick Rogers <ncrogers@gmail.com>
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Subject: Re: arp(8) performance w/ many aliases assigned to an interface
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FYI there is a bugfix/patch for this issue being discussed in
freebsd-hackers:

http://www.mail-archive.com/freebsd-hackers@freebsd.org/msg157097.html