arp

[esha]

is there any arp command that can flush all arp entries in one go

[A. Clay Stephenson]

No, but it would be rather easy to do an arp -a and pipe the output to awk or perl to supply a series of arp -d hostname commands. It would be a very easy (if dangerous) script to write.

[Steven E. Protter]

Shalom,

You could reboot the box or stop networking for a minutes. Either solution would clearly clear the arp table.

man arp

SEP

[spex]

As Clay said, very dangerous:

#!/usr/bin/sh

for i in $(arp -a | awk '{print $1}')
do
arp -d $i
done

From 'man arp':
-d: This option cannot be used to delete a permanent ARP entry whose IP address is an interface on the local system.

So the entries of local interfaces should remain.

PCS

[rick jones]

Of course, all this beggs the question:

Why do you want to flush the ARP cache?