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- Newsgroups: comp.sys.next.programmer
- Path: sparky!uunet!destroyer!ubc-cs!unixg.ubc.ca!kakwa.ucs.ualberta.ca!news
- From: dave@nakiska.ucs.ualberta.ca (David Ross)
- Subject: Re: Change HostID - How ??
- Message-ID: <1992Aug19.194102.3029@kakwa.ucs.ualberta.ca>
- Sender: news@kakwa.ucs.ualberta.ca
- Nntp-Posting-Host: nakiska.ucs.ualberta.ca
- Organization: University Of Alberta, Edmonton Canada
- References: <1992Aug18.153253.3473@midway.uchicago.edu>
- Date: Wed, 19 Aug 1992 19:41:02 GMT
- Lines: 44
-
- In article <1992Aug18.153253.3473@midway.uchicago.edu>
- eer1@midway.uchicago.edu(Paul Woods) writes:
- > Hi -
- >
- > Last week I posted to .sysadmin and I received a couple of responses to
- the
- > following question (none of them were detailed enough). The HostID on a
- NeXT
- > can be changed ( At least that is what I have been told ) and I need to
- be able
- > to change it on several of my NeXT's. HOW DO I PATCH THE OS SO THAT IT
- WILL
- > ALLOW ME TO CHANGE THE HOSTID. I am not a programmer (not really
- anyway) so
- > please keep it on a very simple level.
- >
- > Thanks,
- >
- > Paul-
-
- Hi Paul. You can't change the hostid of a Sun or a NeXT. (Unless there
- is some sort of magical system patch to do it). I missed your previous
- posting so I don't really understand why you would want to.
-
- Some people may have read the man page on the "hostid" command and been
- mislead. The man page says you can change it. It then refers to the
- gethostid(2) call for more info. In that man page it states that the
- hostid is permanent and unique for every machine. It currently returns a
- 4-byte integer with the first byte set to 1, and the last three bytes set
- to the last three bytes of the ethernet address of your machine (which are
- guaranteed to be unique).
-
- The system call sethostid(2) doesn't really seem to work (there's no man
- page for it either). In generic BSD I assume it is possible to set your
- hostid. In fact I know it is on some machines - I've done it. However
- the fixed hostid scheme makes a lot more sense to me as it can be used to
- identify a particular CPU and be guaranteed it will never change. Many
- licensing schemes make use of this.
-
- --
- David A. Ross, Programmer Analyst | dave@nakiska.ucs.ualberta.ca
- Computing and Network Services | (NeXTmail accepted)
- 352 Gen Serv Bldg, Univ of Alberta | Phone: (403) 492-9339
- Edmonton, Alberta, Canada T6G 2H1 | Fax: (403) 492-1729
-