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- Path: sparky!uunet!haven.umd.edu!decuac!pa.dec.com!mogul
- From: mogul@pa.dec.com (Jeffrey Mogul)
- Newsgroups: comp.protocols.tcp-ip
- Subject: Re: reading what you're writing on Suns
- Date: 11 Jan 1993 23:58:41 GMT
- Organization: DEC Western Research
- Lines: 21
- Message-ID: <1it1jhINNpma@usenet.pa.dec.com>
- References: <21102@ucdavis.ucdavis.edu>
- NNTP-Posting-Host: jove.pa.dec.com
-
- In article <21102@ucdavis.ucdavis.edu> heberlei@cs.ucdavis.edu writes:
- >I have found while using ethernet analyzers on Sun workstations
- >that they do not report the packets from the same host that they
- >are running on.
- >Apparently a Sun cannot read the packets that it is writing to
- >the network. I have two questions regarding this:
- > 1) Is this common with most/all workstations (non-Suns)?
-
- Recent versions of ULTRIX provide a mechanism for applications
- (such as tcpdump and nfswatch) to see all packets to/from the
- host they are running on. On ULTRIX: "man packetfilter" and
- look for the string ENCOPYALL. It took us a few tries to get this
- correctly implemented, so before ULTRIX 4.3 there might be some
- related bugs.
-
- Recent releases of tcpdump and nfswatch, including the versions that
- are shipped with ULTRIX, use this mechanism. The latest version
- of NNstat (v3.2) does not, but last week I made the appropriate
- (1-word) patch.
-
- -Jeff
-