From owner-freebsd-questions  Sat Jun 16 10: 3: 3 2001
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Date: Sat, 16 Jun 2001 14:03:07 -0300 (ART)
From: Fernando Gleiser <fgleiser@cactus.fi.uba.ar>
To: "Matthew K. Cowger" <mcowger@bowdoin.edu>
Cc: <questions@FreeBSD.ORG>
Subject: RE: Usage of arp -s
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On Sat, 16 Jun 2001, Matthew K. Cowger wrote:

> Thats the issue.  I do not HAVE the ip address of the host.  Only the MAC
> address.

Let me see:

1) you know the mac address of the remote host
2) you don't know th IP adress.

If that is the case, you are out of luck. arp -s does not solve the case.
ARP maps IP addresses to MAC addresses. if you say, for example:

arp -s 192.168.1.20 91:02:64:de:58:8f


you are saying : "the MAC if the host 192.168.1.20 is 91:02:64:de:58:8f"

then if you ping 192.168.1.20, your host sends a datagram to the box
whose MAC is 91:02:64:de:58:8f . But if 192.168.1.20 is not the IP of the
destination box it will drop the packet in a silent way. That's why you
can't ping the host.



			Fer
>
> I tried:
> arp -s XXX.XXX.XXX.XXX 91:02:64:de:58:8f
> and the command completeed successfully but I cannot ping the host, and I
> know that it is up and DOES respnd to pings....
>
> .matt
>
>
> -----Original Message-----
> From: owner-freebsd-questions@FreeBSD.ORG
> [mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Fernando
> Gleiser
> Sent: Saturday, June 16, 2001 12:39 PM
> To: Matthew K. Cowger
> Cc: questions@FreeBSD.ORG
> Subject: Re: Usage of arp -s
>
>
>
> Try using the IP address instead of the host name.
>
>
> 				Fer
>
>
> On Sat, 16 Jun 2001, Matthew K. Cowger wrote:
>
> > Hi
> >
> > I am try to use ARP (specifically the -s flag) to map a MAC address t oa
> > host name.
> > After reading the man page, i tried:
> >
> > blondie# uname -a
> > FreeBSD blondie.bowdoin.edu 4.3-RELEASE FreeBSD 4.3-RELEASE #0: Wed May  2
> > 22:11:53 EDT 2001
> > mcowger@diablo.bowdoin.edu:/usr/obj/usr/src/sys/BLONDIE  i386
> > blondie# arp -s mytest 91:02:64:de:58:8f
> > arp: mytest: Unknown host
> > blondie#
> >
> > So....what am I doing wrong?  (Note that I dont want to do this via DNS or
> > /etc/hosts for other reasons)
> >
> > Thanx
> >
> >
> > Matt
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-questions" in the body of the message
> >
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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