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- Path: sparky!uunet!elroy.jpl.nasa.gov!usc!news.service.uci.edu!unogate!mvb.saic.com!tgv.com!info-multinet
- Date: 20 NOV 92 21:05:00 GMT
- Newsgroups: vmsnet.networks.tcp-ip.multinet
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- X-RFC822-From: Brian McKeever <MCKEEVER@VAX2.CSTP.UMKC.EDU>
- From: Brian McKeever <MCKEEVER@VAX2.CSTP.UMKC.EDU>
- Subject: TCPDUMP and the ETHERS file.
- X-Envelope-to: INFO-MULTINET@TGV.COM
- X-VMS-To: IN%"INFO-MULTINET@TGV.COM"
- Organization: The INFO-MULTINET Community
- Message-ID: <36A00FB320NOV92210500@TGV.COM>
- Nntp-Posting-Host: Mvb.Saic.Com
- Lines: 44
-
- I've been doing some debugging using TCPDUMP. From the Multinet help
- library I get this:
-
- ether dst ehost
- True if the ethernet destination address is ehost. Ehost may be
- either a name from MULTINET:TCPDUMP.ETHERS or a number.
- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^
-
- Now. My ethers file looks like this:
-
- #
- # This file maps between ethernet addresses and host names for
- # the tcpdump utility
- #
- 09:00:2B:00:00:0F LAT-servers
- 09:00:2B:01:00:01 DEC-bridges
- 09:00:2B:02:00:00 DECnet-L2-Rtrs
- AB:00:00:01:00:00 DECnet-Dump/Load
- AB:00:00:02:00:00 Remote-Console
- AB:00:00:03:00:00 DECnet-Routers
- AB:00:00:04:00:00 DECnet-End-Nodes
- AB:00:03:00:00:00 LAT-multicast
- CF:00:00:00:00:00 loopback
- FF:FF:FF:FF:FF:FF broadcast
- 00:00:89:01:A1:AC Cecil
-
- My question is, why can't I use the name "Cecil" in the TCPDUMP command?
-
- $ mu tcpdump/snap=1500 ether host cecil
- tcpdump: unknown ether host 'cecil'
- $
-
- But, when I enter the Ethernet address for Cecil, I get:
-
- $ mu tcpdump/snap=1500 ether host 00:00:89:01:a1:ac
- 13:57:04.27 Cecil 9:0:7:ff:ff:ff 0022 26:
- 001a 0000 0000 0002 ff5d 0101 0100 0208 .........]......
- 5d00 0280 0002 8200 0900 ].........
-
- It obediently translates Cecil's Ethernet address into the name Cecil when
- it displays the packets. Anybody know what's going on?
-
- --Brian
-