Re: can we ping via MAC address? [7:6387]
That's really close, but I don't know of an application that allows you to arbitrarily RARP... There is a way you can display the MAC to IP mappings that works from either Windows or Unix machines, though the syntax may differ slightly for each, depending on flavor. From a DOS prompt, or a Unix shell, type: arp -a This will list all of the MAC addresses and their corresponding IP addresses that are in the system's cache. Sometimes it's helpful to ping the segment's IP broadcast address prior, because arp entries time out. Pinging the broadcast address should cause a flurry of arp action on the segment, and should populate the arp cache. Remember, you must do this from a machine on the same segment/subnet. Arp is locally signifigant. You cannot arp for a device on a different IP subnet. Hope this helps, Alan - Original Message - From: Dyson Kuben To: Sent: Wednesday, May 30, 2001 6:44 AM Subject: RE: can we ping via MAC address? [7:6387] You won't be able to ping a MAC-Address, but if you only want to find an IP associated with the MAC, try using RARP! (Reverse ARP) Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6422t=6387 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: can we ping via MAC address? [7:6387]
if you have access to the router that routes for the computer's local network, then look in the arp table to find the MAC address: sh arp | inc Andy - Original Message - From: Susan Stone To: Sent: Wednesday, May 30, 2001 9:36 AM Subject: can we ping via MAC address? [7:6387] Hi.. Dear all, If we have a MAC address, can we find out what is the IP address associated with it? Given MAC find IP. Basically like ping via MAC address. Can it be done? Susan _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6428t=6387 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: can we ping via MAC address? [7:6387]
If you enable IPX routing, and have IPX network numbers on your various router interfaces, or have IPX protocol stacks on your PC's then yes you can ping mac addresses from a Cisco router. recall that in the world of IPX the mac is the host portion of an IPX address. I won't say that it's fun or easy. Particularly in a production network, no matter how small. Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Dyson Kuben Sent: Wednesday, May 30, 2001 3:45 AM To: [EMAIL PROTECTED] Subject:RE: can we ping via MAC address? [7:6387] You won't be able to ping a MAC-Address, but if you only want to find an IP associated with the MAC, try using RARP! (Reverse ARP) FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6431t=6387 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: can we ping via MAC address? [7:6387]
I hate following up my own posts, but I went to one of my Linux boxes to see if there was a 'rarp' command. It turns out there is, and it works just like the arp command I listed below. The only problem was that I don't have rarp support compiled into my kernel, so I couldn't use it. The drawback to each of these commands, however, is that they don't perform an arp or rarp queries. They simply offer a means of displaying, or clearing, the entries in the arp or rarp tables. It doesn't really matter though... Like I said before, the quickest way to get the machine to initiate a query is to simply ping something. If the entry doesn't already exist in the cache, it will perform the query without intervention. [Side note: Ever notice that when you ping something from a Cisco, like a device on a connected ethernet segment, that the first ping typically fails, but the remaining 4 pings work fine, and subsequent pings work 5/5? That's arp in action.] Alan - Original Message - From: W. Alan Robertson To: Sent: Wednesday, May 30, 2001 9:36 AM Subject: Re: can we ping via MAC address? [7:6387] That's really close, but I don't know of an application that allows you to arbitrarily RARP... There is a way you can display the MAC to IP mappings that works from either Windows or Unix machines, though the syntax may differ slightly for each, depending on flavor. From a DOS prompt, or a Unix shell, type: arp -a This will list all of the MAC addresses and their corresponding IP addresses that are in the system's cache. Sometimes it's helpful to ping the segment's IP broadcast address prior, because arp entries time out. Pinging the broadcast address should cause a flurry of arp action on the segment, and should populate the arp cache. Remember, you must do this from a machine on the same segment/subnet. Arp is locally signifigant. You cannot arp for a device on a different IP subnet. Hope this helps, Alan - Original Message - From: Dyson Kuben To: Sent: Wednesday, May 30, 2001 6:44 AM Subject: RE: can we ping via MAC address? [7:6387] You won't be able to ping a MAC-Address, but if you only want to find an IP associated with the MAC, try using RARP! (Reverse ARP) FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6433t=6387 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: can we ping via MAC address? [7:6387]
On Wed, 30 May 2001, Susan Stone wrote: Hi.. Dear all, If we have a MAC address, can we find out what is the IP address associated with it? Given MAC find IP. Basically like ping via MAC address. Can it be done? Susan _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- Sanity is calming, but madness is far more interesting. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6471t=6387 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: can we ping via MAC address? [7:6387]
RARP requires a RARP server. It was a predecessor to BOOTP and DHCP. It was used by diskless stations that had a MAC address but no IP address. RARP servers were usually implemented on a UNIX machine. They were pretty easy to set up. They included the functionality to also TFTP to the diskless station its OS and applications. So, RARP won't solve her problem. If she has access to the ARP cache on a relevant router, it would give her the IP address for the MAC address. She would have to be looking at the router that is local to the MAC address though. Or she could look at the ARP cache on a client or server on the local segment also. Priscilla At 06:44 AM 5/30/01, Dyson Kuben wrote: You won't be able to ping a MAC-Address, but if you only want to find an IP associated with the MAC, try using RARP! (Reverse ARP) FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6525t=6387 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
