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Date: Tue, 11 Feb 2014 19:27:57 +0100
From: Erik Stian Tefre <erik@tefre.com>
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To: =?ISO-8859-1?Q?Efra=EDn_D=E9ctor?= <efraindector@motumweb.com>, 
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Subject: Re: CARP in FreeBSD10
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On 11. feb. 2014 19:05, Efraín Déctor wrote:
> Hello.
>
> I am triying to enable CARP on FreeBSD 10.0-RELEASE, I have read the 
> documentation (http://www.freebsd.org/doc/en/books/handbook/carp.html) 
> I tried to enable the module of carp, putting if_carp_load="YES" on 
> /boot/loader.conf, rebooted and after that I tried to enable it using 
> the command/ifconfig carp0 create/. However after that I get the 
> following message:
>
> "ifconfig: SIOCIFCREATE2: Invalid argument".
>
> Then after that I rebuilded the kernel putting the option:
>
> device    carp
>
> But afther rebuilding and installing I still get the message 
> "ifconfig: SIOCIFCREATE2: Invalid argument".
[...]

http://people.freebsd.org/~glebius/newcarp/README

And of course:
man carp

--
Erik