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From: narten@PURDUE.EDU ("Thomas Narten")
Newsgroups: mod.protocols.tcp-ip
Subject: Re: more interesting features of 4.2
Message-ID: <8606041506.AA27808@guenevere.Purdue.EDU>
Date: Wed, 4-Jun-86 11:06:38 EDT
Article-I.D.: guenever.8606041506.AA27808
Posted: Wed Jun  4 11:06:38 1986
Date-Received: Wed, 4-Jun-86 23:45:36 EDT
References: <12212068498.49.HEDRICK@RED.RUTGERS.EDU>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
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Approved: tcp-ip@sri-nic.arpa

>But [UNIX] does time out ARP entries, so eventually it will correct
>routings when ARP are being used to discover routes.

This is not always true. ARP entries that are not referenced for X
minutes (20 for us) are deleted. This is not the same thing as saying
IP to Ethernet mappings that aren't valid get deleted. If you continue
to try to send to a host, the ARP entry continues to get referenced and
will not time out at all. Hence, it is not clear that having paths
through multiple gateways to the same destination will always be used
the way one expects if the currently used gateway crashes.

Thomas

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