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Message-ID: <010c01c43a27$9cc813b0$0201a8c0@dredster>
From: "Micheal Patterson" <micheal@tsgincorporated.com>
To: "Dwight Spence" <dspence@marsys.com>, <questions@freebsd.org>
References: <5F8E195A1BED3545B98B08BEFA24DE370AD4EF@msimailfl.marsys.com>
Date: Fri, 14 May 2004 21:51:51 -0500
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Subject: Re: Creating Virtual Interfaces
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----- Original Message ----- 
From: "Dwight Spence" <dspence@marsys.com>
To: <questions@freebsd.org>
Sent: Friday, May 14, 2004 4:06 PM
Subject: Creating Virtual Interfaces


> Is there a difference between virtual interfaces and alias ips?
> Also is FreeBSD able to configured interfaces such as bge0:1, bge0:2,
bge0:3?
> Or is ifconfig bge0 alias <ip_address> netmask <netmask> the only way?
> I am attempting to add 30 ips.
>
> Dwight Spence


Dwight, I've looked and what you're referring to would be sub interfaces,
such as Cisco and various other main stream routers use. FreeBSD to my
knowledge (and I even googled for it) doesn't support this, at least in 4.9
anyway. One thing to note when doing aliases, if all of the IP's are in the
same subnet,  the netmask for all aliased interfaces will be
255.255.255.255. The format for this in the rc.conf file would be:

ifconfig xl0="inet 192.168.1.1 netmask 255.255.255.0"
ifconfig_xl0_alias0="inet 192.168.1.2 netmask 255.255.255.255"
ifconfig_xl0_alias1="inet 192.168.1.3 netmask 255.255.255.255"
... and so on.

Should they be ip's from different subnets, you should use the proper
netmask associated with that subnet.

ifconfig xl0="inet 192.168.1.1 netmask 255.255.255.0"
ifconfig_xl0_alias0="inet 192.168.2.1 netmask 255.255.255.0"
ifconfig_xl0_alias1="inet 192.168.3.1 netmask 255.255.255.248"
... and so on.

--

Micheal Patterson
TSG Network Administration
405-917-0600

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