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From: "Dmitriy V. Andrushko" <da@ubtc.kharkov.ua>
To: kamal kc <rosey_kc@yahoo.com>
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cc: freebsd-net@freebsd.org
Subject: Re: help:: configuring two network interfaces--message->>ifconfig:
 ioctl (SIOCAIFADDR): File exists
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>  ifconfig_rl1="inet 192.168.10.1  netmask 255.255.255.0"
>  ifconfig_rl0="inet 192.168.10.2  netmask 255.255.255.0"

 You can't have two network interfaces on the same subnet. You can
configure your net next way:
ifconfig_rl1="inet 192.168.10.1  netmask 255.255.255.0"
ifconfig_rl0="inet 192.168.20.1  netmask 255.255.255.0"