Subject: Re: RTM_ADD and overwriting arp entries
To: David Brownlee <>
From: Andrew Brown <>
List: tech-net
Date: 08/17/2001 15:52:22
>	RTM_ADD will not overwrite an existing (partial) arp entry.
>	My guess is this behaviour was introduced around 1.4 with the
>	new media independent arp subsystem.
>	This is a problem for netbooting machines with bootroms that do
>	not respond to arp (a sun IPC is a good example). If a partial arp
>	entry is present rarpd will not be able to replace it, and when
>	the client tries to tftp the bootloader the server will just sit
>	there sending out arp requests until the arp entry is manually
>	deleted (or everything is killed and it times out).
>	I've run up a trivial patch to make rarpd explicitly delete an
>	existing arp entry before RTM_ADD.
>	Does anyone have any better suggestions?

if the RTM_ADD fails, retry with RTM_CHANGE?

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