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- From: harvey@indyvax.iupui.edu
- Newsgroups: comp.dcom.lans.ethernet
- Subject: Re: new hardwareaddress
- Message-ID: <1993Jan7.181506.219@indyvax.iupui.edu>
- Date: 7 Jan 93 18:15:06 -0500
- References: <hoens.726222216@gmd.de> <mark.726251794@coombs> <hoens.726332427@gmd.de> <1993Jan7.160840.14887@merlin.dev.cdx.mot.com>
- Organization: Indiana University-Purdue University at Indianapolis
- Lines: 43
-
- In article <1993Jan7.160840.14887@merlin.dev.cdx.mot.com>, Mehrtens_T@msm.cdx.mot.com writes:
- > In article(Guenter Hoens) writes:
- >> but if it is a different protocol, then we can find out (by looking
- >>at the packets)
- >>
- >
- > I see very few options. If the device is a MACintosh, then you can use
- > "Interpoll" to query the subnetwork, and use a ethernet monitor/analyzer to
- > look at the MAC level addressses. TCP/IP ping, and other polling packages have
- > been mentioned for other platforms. DECnet send out packets all the time.
- > TCP/IP send out on AARPs, XNS send out ARPs, spanning tree bridges send out
- > unintelligible trash (loop testing), etc.
- >
- > There are many, many ethernet analyzers out there. Here are a couple:
- > Sniffer, H.P., NetLens, public domain PC based analyser, InTel NetSight,
- > NetSisht Persfessional, etc. Ethernet monitoring packages aplenty!
- >
- > I wigh there was an easier way for me to find my 530 addresses - I had to
- > locate them one at a time. Luckily, this happened over many years, so
- > maintenance is easier now.
- >
- > Now that networks are routed, the router tells me the I.P./Ethernet
- > correlation.
-
- Yes, this is very convenient. I have a procedure that runs every four hours
- (the timeout on the ARP caches on the routers), uses a telnet script to dump
- the ARP cache of each router, and then digests the output and updates an
- indexed file of IP and hardware addresses (with the date the entry was last
- seen). Very handy for hunting down confused users randomly changing IP
- addresses because they don't know any better, or trying to use the same ones
- as the fellow in the office down the hall, or otherwise misconfigured systems.
- With over 1000 machines on the network (not counting probably at least as many
- at the I.U. Medical Center that I don't keep track of) it can come in quite
- handy at times.
-
- My stuff uses a scripted Telnet written at I.U. and a set of DCL command
- procedures running on a VAX under VMS, so it probably wouldn't be of much
- use to most people. But it wouldn't be too hard to write something like
- it for Unix if you could find a Telnet that supports scripts (C-Kermit comes
- to mind).
- --
- James Harvey IUPUI OIT Technical Support/Networks
- harvey@iupui.edu harvey@indiana.edu uucp:iugate!harvey bitnet:harvey@indyvax
-