Date: Thu, 26 Jul 2001 15:45:15 -0500 (CDT) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: Terry Lambert <tlambert2@mindspring.com> Cc: Julian Elischer <julian@elischer.org>, "Eugene L. Vorokov" <vel@bugz.infotecs.ru>, Soren Kristensen <soren@soekris.com>, <freebsd-hackers@FreeBSD.ORG>, <freebsd-net@FreeBSD.ORG> Subject: Re: Why two cards on the same segment... Message-ID: <Pine.BSF.4.32.0107261528390.2406-100000@mail.wolves.k12.mo.us> In-Reply-To: <3B6055C8.C0B5554D@mindspring.com>
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On Thu, 26 Jul 2001, Terry Lambert wrote:
[...other stuff I've not personally encountered snipped...]
> ...or the mess the FreeBSD alias code is in, with it demanding
> netmasks of 255.255.255.255 on aliases, so that aliases and the
> primary IP _MUST_ have the same netmask instead of different ones
> (hell, he may just be trying to have two IP's with different
> netmasks, and the only way he can do it in FreeBSD is to have two
> cards!).
Why would you want multiple IP addresses that belong to the same IP
network to have different subnet masks? You'll break the network.
If you're saying that you can't put two or more different IP addresses
on one NIC that belong to different IP networks, then don't tell my
router that, it might decide to stop working. :-)
fxp7: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet 207.160.214.253 netmask 0xffffff00 broadcast 207.160.214.255
inet 207.160.214.252 netmask 0xffffffff broadcast 207.160.214.252
inet 192.168.254.254 netmask 0xffffff00 broadcast 192.168.254.255
ether 00:08:c7:07:b2:96
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
> So, the major reasons for two cards on one segment: to work around
> bugs in FreeBSD's networking code.
The best reason I can think of to put two cards on one segment is for
performance reasons. You'll only get a performance benefit if you're
attached to a switch, of course. I'm not talking about Fast
EtherChannel or other channel bonding or anything like that, just two
or more NICs with two or more different IP addresses.
-- Chris Dillon - cdillon@wolves.k12.mo.us - cdillon@inter-linc.net
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