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From: j@ida.interface-business.de (J Wunsch)
Newsgroups: comp.unix.bsd.misc,comp.unix.bsd.bsdi.misc,comp.unix.bsd.freebsd.misc,comp.unix.bsd.netbsd.misc
Subject: Re: Running several networking cards in one system?
Date: 17 Jan 1997 14:37:37 GMT
Organization: interface business GmbH, Dresden
Lines: 46
Message-ID: <5bo2rh$k6b@innocence.interface-business.de>
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Reply-To: joerg_wunsch@interface-business.de (Joerg Wunsch)
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.misc:1936 comp.unix.bsd.bsdi.misc:5629 comp.unix.bsd.freebsd.misc:34153 comp.unix.bsd.netbsd.misc:5184
mschmidt@me-tech.PFM-Mainz.de (Michael Schmidt) wrote:
> > You can have a dozen of network cards in a BSD
> > system (but not in a PC, since you'll run out of IRQ lines :).
>
> Well, meanwhile I have heard of networking cards with several ports on each
> card. Putting several of these cards in a system then you should have more
> than what I have been asking for...
Sure, this is possible. Put two of them into one box, and you've got
8 ethernet interfaces. With IP, this requires 8 different IP
addresses (of course), so you can route packets into 8 different
directions.
What you still _can't_ do however is:
+---------+ +---------+
| Box 1 | | Box 2 |
|192.168.1| |192.168.1|
| .1 o-----------------------o .2 |
| | | |
| .9 o-----------------------o .10 |
| | | |
| .17 o-----------------------o .18 |
| | | |
| .25 o-----------------------o .26 |
| | | |
| | | |
+---------+ +---------+
...and then try sending something in a single connection from Box 1 to
Box 2, hoping that the traffic will be distributed across all 4 wires.
This is the way IP works: you are not going to connect to another
_machine_, but to another IP address. Sitting on box 1, you have to
decide for an outgoing request whether it should go to 192.168.1.2,
192.168.1.10, 192.168.1.18, or 192.168.1.26. Depending on which of
these addresses you're using, you select the local interface und thus
the wire that will be used.
If you're looking into increasing throughput, it's probably better to
switch to 100 Mbit/s Ethernet, or to FDDI.
--
J"org Wunsch Unix support engineer
joerg_wunsch@interface-business.de http://www.interface-business.de/~j