Ethereal-users: RE: [Ethereal-users] Resolving IP addr. from MAC addr....gotta be a way

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From: "McNutt, Justin M." <McNuttJ@xxxxxxxxxxxx>
Date: Sat, 26 Oct 2002 18:22:14 -0500
Actually, it isn't in this case, because a dial-up connection is not a MAC-based network.  In other words, the modem doesn't have a MAC address.  Only IEEE 802 networks (Ethernet, Token Ring, some wireless) have MAC addresses.
 
What I used to do in this case was I added a script to the end of my dial-up routine.  When my computer set up the dial-up connection, the very last thing it did was pull the latest IP address and send it to me in e-mail (on a remote server, of course).  There are probably other clever variations on this, including having the dial-up machine register some name with a WINS or DDNS server.
 
Something closer to the topic of this list might be that you could set up a packet capture on some permanently-connected host.  Then have the dial-up machine send 5 pings of an arbitrary size with a specific message in them whenever connection is re-established.  The machine running ethereal could look for those packets, and upon receiving them, send you a message.  That's a lot of scripting, though.  Your best bet is the automatic e-mail from the dial-up host.
 
--J
 
P.S.  Fair warning:  If you do the e-mail thing, be careful that you don't get into a situation where your dial-up connection goes up and down rapidly or you'll have an Inbox flooded with IP address updates!
-----Original Message-----
From: gaurav_gui [mailto:gaurav_gui@xxxxxxxxxxxxxx]
Sent: Saturday, October 26, 2002 4:34 AM
To: ethereal-users@xxxxxxxxxxxx
Subject: [Ethereal-users] Resolving IP addr. from MAC addr....gotta be a way

Hey...I need to access pc remotely which is connected via a dial-up...so it's IP changes dynamically...It's a bit of a hassle for me to find out the IP address everytime...However, I do know the MAC address of the machine so I was wondering if there's a way I can find out the new IP address of the machine everytime it logs on using it's permanent ethernet address...please suugest a way...all replies will be appreciated!
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