SUMMARY: Enet to IP resolution

From: Mark Sims (
Date: Mon May 03 1993 - 14:04:52 CDT


I received many replies, most the correct answer. Here is my original question:

> I have an IP number of a host on my network. I want to know its ethernet
> (MAC) address. Sometimes I can get the ethernet number from the ARP table
> on my system if I first ping the host and then do a "arp -a".
> The problem is this only work for certain hosts. Why doesn't this approach
> work for any host?

The reason is that the host in question is on the other side of a router.
Thus, the router does not pass back the MAC address via arp to the source

Thanx to all that replied:

Todd Kover <kovert@cs.UMD.EDU> (Michael Lamoureux)
Randy Diffenderfer <>
hyder@niwot.scd.ucar.EDU (Paul Hyder) (Russ Poffenberger)
amp19263@garfield (John R. Kilheffer)
Barry Margolin <barmar@Think.COM> (Daniel Trinkle)
Christian Lawrence <>

Mark Sims

Mark Sims
MSI Professional Services, Inc.
1400 North Woodward Avenue
Suite 101
Bloomfield Hills, Michigan 48304

Phone: (313) 646-2582
FAX: (313) 642-2603

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