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- Path: sparky!uunet!auspex-gw!guy
- From: guy@Auspex.COM (Guy Harris)
- Newsgroups: comp.protocols.tcp-ip
- Subject: Re: reading what you're writing on Suns
- Message-ID: <16287@auspex-gw.auspex.com>
- Date: 8 Jan 93 19:24:13 GMT
- References: <21102@ucdavis.ucdavis.edu>
- Sender: news@auspex-gw.auspex.com
- Organization: Auspex Systems, Santa Clara
- Lines: 23
- Nntp-Posting-Host: auspex.auspex.com
-
- >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)?
-
- I've never seen an Ethernet interface that *does* hear its own
- transmissions, but some may exist. All the Ethernet-interface drivers
- I've seen will wrap transmitted *broadcast* packets around internally,
- so that it *looks* as if they receive the packet, but they don't do so
- for non-broadcast packets.
-
- > 2) Is there a patch so the Sun can read it's own packets?
-
- The precise question you're asking is "is there a patch so that the Sun
- can read its own packets *through the Network Interface Tap (NIT)
- mechanism*, that being the mechanism that "etherfind" uses to listen to
- Ethernet traffic.
-
- I know of none, although a quick look at the code indicates that it
- might be possible to arrange to have non-broadcast packets wrapped
- around, just as broadcast packets are wrapped around, if the Ethernet
- interface is in promiscuous mode, so I suspect such a patch is, at
- least, implementable.
-