dhclient multiple aliases limitation

[Brooks Davis]

On Tue, Aug 28, 2007 at 03:51:25PM -0500, Sean C. Farley wrote:
>  I currently have a setup on a laptop where I have two aliases that I
>  always want present.  I would like to setup two aliases in
>  /etc/dhclient.conf to handle having the Ethernet cable plugged in after
>  boot, but dhclient has a limit of handling only one alias.
> 
>  /etc/rc.conf
>  ifconfig_xl0="DHCP"
>  ifconfig_xl0_alias0="inet 192.168.1.46 netmask 255.255.255.255"
>  ifconfig_xl0_alias1="inet 192.168.6.46 netmask 255.255.255.0"
> 
>  The first address uses an alias-type netmask while the second is a
>  private network I have for QEMU.
> 
>  I found that during PREINIT /sbin/dhclient-script is deleting the
>  192.168.1.46 address when it runs this:
> 
>  ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 
>  up
> 
>  A possible solution that works for me is to add an "alias" to this line.
>  It appears to work, but I do not know if this would cause problems
>  elsewhere or for other scenarios.  Does anyone see any problems with
>  this change?

Off hand this sounds correct.  We really want dhclient to leave any
addresses other than ones it sets alone so always using alias directives
is probably correct.

-- Brooks

>  Sean
> 
>  P.S.  Please Cc me since I am not on this list.
>  -- 
>  scf at FreeBSD.org

Content-Description: dhclient-script patch
> --- /sbin/dhclient-script	2006-05-12 22:24:00.000000000 -0500
> +++ /etc/dhclient-script	2007-08-28 15:25:30.000000000 -0500
> @@ -223,7 +223,7 @@
>  
>  PREINIT)
>  	delete_old_alias
> -	ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up
> +	ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 alias up
>  	;;
>  
>  ARPCHECK|ARPSEND)

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