Date: Mon, 13 Jan 2003 12:49:54 +0100 From: Anand Buddhdev <arb@anand.org> To: questions@freebsd.org Subject: Multiple network cards with IP addresses in the same network Message-ID: <20030113114954.GQ1330@anand.org>
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I have a FreeBSD 4.7 system, with 3 ethernet cards. The first two are recognised as fxp0 and fxp1 and the second as em0 (intel gigabit card). I configured the em0 with address 192.168.0.1/24. I then wanted to configure fxp0 with the address 192.168.0.2/24, and also connect it to the switch so that I can connect to the server via both addresses. However, FreeBSD's ifconfig command fails, and won't let me add the second address to the fxp0 interface. I read the manual page about ifconfig, and read about aliases, where it said that for aliases, I must use the netmask /32. When I do try to add the second address with a netmask of /32, it works, but it doesn't make sense to me. How is that interface going to to know that it is part of a /24 network if I use a /32 netmask? Would anyone be kind enough to explain why: 1. For aliases, I need the /32 mask 2. Adding a second IP to a *different* network card in the same server does not work if the second IP is within the network of the first one. -- Anand Buddhdev http://anand.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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