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Date:      Wed, 07 Jun 2000 11:28:08 -0700
From:      "Raymundo M. Vega" <RaymundoVega@home.com>
To:        Alex Kwan <alexkwan@pacific.net.hk>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: Question about man ifconfig
Message-ID:  <393E9438.6CA4163E@home.com>
References:  <000701bfd0a5$69e108c0$831e40ca@alexkwan>

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Alex Kwan wrote:
> 
> Hi!
> 
> I wanted to setup multi IP address on a ethernet interface,
> and the man ifconfig said:
> 
> "The following parameters may be set with ifconfig:
> 
> add       ............................
> 
> alias      ............................
>             If the address is on the same subnet as the first network
> address
>             for this interface, a netmask of 0xffffffff has to be specified.
> "
> 
> Why do I can't set the netmask as the normal 255.255.255.0 (for C class)
> and needed to set as 0xffffffff(255.255.255.255)?

because alias is intended for two different nets, of you
use the al"f" mask you are fooling ifconfig and make it
accept the new ip address.

raymundo
> 
> Thanks
> 
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