SUMMARY: Solaris 7 Arp Timeout

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Thanks to Mark Hollow for this remarkably thorough answer:

---

This is measured in milliseconds.

Alex Nordergraaf's articles on Solaris network security
(www.sun.com/blueprints) suggest this should be set to 60000ms (1
minute).

If you only need to swap a cable from one router to another then setting
it
to approx 5 seconds should be ok - I wouldn't leave it this low
permanently
though.

Alternatively you could just delete the old arp entry from the cache
when
changing the cable:

	arp -d <router's hostname>

After this the server will have to broadcast an arp request to get the
(new)
MAC address.

Regards,
Mark
---
Mark Hollow

-----Original Message-----

We are changing on of our routers, and want to minimize downtime.

I want to change the ARP timeout temporarily so that when the IP changes
between the two MAC addresses there will be (minimal) interuption to
service.

The command

/usr/sbin/ndd -set /dev/arp arp_cleanup_interval <number>

can be used to change the ARP timeout.

By default this value is 300000. I want to know two things:
What is a safe low value I can use?
What unit of time is used for this value?

-JohnF

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