From owner-freebsd-questions  Thu Feb 28 10:17:59 2002
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Date: Thu, 28 Feb 2002 13:17:31 -0500
From: Daniel Frazier <dfrazier@magpage.com>
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To: Marcus Grando <marcus@big.univali.br>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: ifconfig alias problem
References: <5.1.0.14.1.20020228143532.00a8cda0@mail.big.univali.br>
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Marcus Grando wrote:

> 	Hello all,
> 
> 	After CVSUP the 4.5-STABLE, i have this problem:
> 
> 	/etc/rc.conf entryes:
> 
> 	ifconfig_fxp0="inet X.X.X.10 broadcast X.X.X.X netmask 255.255.255.224"
> 	ifconfig_fxp0_alias0="inet X.X.X.17 broadcast X.X.X.X netmask 255.255.255.224"
> 
> 	After reboot, the alias interface not UP, but try insert alias interface and occured this error:
> 
> vesper:~# ifconfig
> fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>         inet X.X.X.10 netmask 0xffffffe0 broadcast X.X.X.31
>         ether 00:d0:b7:8f:75:cd
>         media: Ethernet 100baseTX <full-duplex>
>         status: active
> faith0: flags=8002<BROADCAST,MULTICAST> mtu 1500
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
>         inet6 ::1 prefixlen 128
>         inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
>         inet 127.0.0.1 netmask 0xff000000
> vesper:~# ifconfig fxp0 X.X.X.17 netmask 255.255.255.224 broadcast X.X.X.31 alias
> ifconfig: ioctl (SIOCAIFADDR): File exists
> 


from man ifconfig:

alias   Establish an additional network address for this interface.  This
         is sometimes useful when changing network numbers, and one wishes
         to accept packets addressed to the old interface.  If the address
         is on the same subnet as the first network address for this
         interface, a netmask of 0xffffffff has to be specified.

so, change this...

ifconfig_fxp0_alias0="inet X.X.X.17 broadcast X.X.X.X netmask 255.255.255.224"

to this...

ifconfig_fxp0_alias0="inet X.X.X.17 broadcast X.X.X.X netmask 255.255.255.255"

and you should be good to go.


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