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- Path: sparky!uunet!decwrl!hal.com!gorn.hal.com!not-for-mail
- From: jonl@hal.COM (jon r. luini)
- Newsgroups: comp.sys.sun.admin
- Subject: Re: Two ethernet cards attached to same physical network
- Date: 1 Sep 1992 15:04:15 -0700
- Organization: HAL Computer Systems, Inc.
- Lines: 31
- Distribution: hal
- Message-ID: <180pcvINNhc@gorn.hal.com>
- References: <darren.2@hawkesbury.uws.EDU.AU>
- NNTP-Posting-Host: gorn.hal.com
-
- In <darren.2@hawkesbury.uws.EDU.AU> darren@hawkesbury.uws.EDU.AU (Darren Bovis) writes:
-
- >Recently we have purchased an SBUS ethernet controler for one of our
- >backbone SUN's under the pretense that we could route between two
- >logical subnets on the same physical network. That is we have run out
- >of IP addresses in the backbone subnet and were attempting to run
- >another gateway between the new subnet. This doesn't work due to the
- >ethernet controler not having its own MAC address (uses the internal
- >controlers address). This causes re-occuring broadcast storms on the
- >local ethernet not to mention numerous other problems.
-
- i encountered this problem when we had a machine with 4 different
- interfaces, each on a different subnet. due to the way sun deals with
- ethernet addresses and the way the particular router we had did, we
- had some major strangeness occur.
-
- the workaround is to ifconfig the additional interfaces on the sun machine
- to unique ethernet addresses. this can be done with
- "ifconfig <interface> ether xxxxxxxx". the problem is getting a unique
- ethernet address to use there. in our case, we had some spare ones which
- came with the standard router allocatation which we could use. i have
- been searching for a way to extract the on prom ethernet address which
- should come with each ethernet card, but have been unable to get any
- information about how to do so. if anyone has information on doing this,
- i'd love to hear about it!
-
-
- --
- jon r. luini, jonl@hal.com
- system administration
- (408) 379-7000, x1276
-