rc.conf - setting interface UP without IP-address?

[Rein Kadastik]

Excuse me for a silly question, but what the hell is UP? I know, what is 
IP, I know how ifconfig works, but wtf is UP?

Rein

Giorgos Keramidas wrote:

>On 2005-08-31 11:02, Ewald Jenisch <a at jenisch.at> wrote:
>  
>
>>I'm looking for a way to set an interface UP using /etc/rc.conf
>>without giving the interface an IP-address (i.e. neither static nor
>>DHCP)
>>
>>Background: The machine in question has three Ethernet-IFs - one
>>connects to the LAN (and has an IP-address) the other two are used for
>>monitoring traffic via ethereal only. For security reasons I don't
>>want to assign IP-addresses to the two "ethereal-only" interfaces -
>>but I need them "UP".
>>
>>Sure enough I can "up" these interfaces manually but I want them up at
>>boot-time.
>>
>>I've tried with entries like e.g.
>>
>>ifconfig_fxp1=""
>>ifconfig_fxp1="UP"
>>
>>in my /etc/rc.conf - none of these work.
>>    
>>
>
>Try "up" (lowercase) instead.
>
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