[106988] in North American Network Operators' Group
RE: SLAAC(autoconfig) vs DHCPv6
daemon@ATHENA.MIT.EDU (Darden, Patrick S.)
Tue Aug 19 08:40:44 2008
Date: Tue, 19 Aug 2008 08:40:36 -0400
In-Reply-To: <007b01c9016a$8cd72180$020fa8c0@HDESK1>
From: "Darden, Patrick S." <darden@armc.org>
To: "Howard C. Berkowitz" <hcb@netcases.net>,
<nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
1. I think ARP is effectively a ping for a mac. It verifies =
connectivity on level 2 between two hosts. You have to be on the same =
segment though....
To make it work, you would have to know the mac address of the remote =
host, clear the arp table the local host, then send the ARP request =
out.
This would still require that each host have IP stacks in place with =
functioning IP addresses. Although ARP acts under IP, it still requires =
IP to function.
2. I think you might be able to fudge it using RARP, if you just look =
for signals sent to that address.=20
3. A kind of constant ping might be... if you knew the remote's MAC =
address you could poison the ARP table with an announcement, spoof the =
MAC locally, then do MITM stuff and relay communications.
4. Ok, after all that craziness I did a google search and found ARPING: =
http://en.wikipedia.org/wiki/Arping
ARPING still seems to rely upon a proper IP stack and address on both =
hosts.
Meh, your best bet might be just to scan your arp tables for the mac you =
are interested in. I think all NICs broadcast periodically saying "I am =
here". Passive ping.
--p
-----Original Message-----
From: Howard C. Berkowitz [mailto:hcb@netcases.net]
Sent: Monday, August 18, 2008 3:42 PM
To: nanog@nanog.org
Subject: RE: SLAAC(autoconfig) vs DHCPv6
This was especially a question when L2 was "in" and routing was out: how =
do
you ping a MAC address?
