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Date: Sat, 3 Mar 2001 18:26:53 -0800 (PST)
From: Archie Cobbs <archie@dellroad.org>
Reply-To: archie@dellroad.org
To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/25517: ARP cache timeout behavior can be improved
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>Number:         25517
>Category:       kern
>Synopsis:       ARP cache timeout behavior can be improved
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Sat Mar 03 18:40:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Archie Cobbs
>Release:        FreeBSD 4.2-RELEASE i386
>Organization:
Packet Design, Inc.
>Environment:

	All current versions of FreeBSD

>Description:

	When an ARP entry expires after 15 minutes, the ARP entry
	is simply deleted from the ARP cache. Then the next packet(s)
	destined for the other host are delayed while a new ARP
	query and response takes place.

	This delay is unnecessary and disruptive for certain
	protocols that are sensitive to jitter. Moreover, as network
	speeds increase while ARP query/response cycles continue
	to take roughly the same amount of time, this effect will
	become more and more pronounced.

	This problem should be easy to fix... 

	> From: Stephen Casner <casner@packetdesign.com>
	> 
	> The suggested enhancement is to _not_ flush an arp cache
	> entry when its timer expires.  Instead, go ahead and send
	> the arp request, but continue using the cache entry to send
	> packets.  If there is no response to the arp request after
	> the number of retries specified in the protocol, then flush
	> the cache entry.

>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

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