OpenWrt White Russian 0.9
X-Wrt
WRT54g v3.0

I'm trying to add multiple wan IP addresses and following
http://forum.openwrt.org/viewtopic.php?id=9160

I run the following command and all works fine.
ip addr add 12.123.123.123/24 dev vlan1

I can ping both wan ip's from outside.

Then I run
nvram commit
no errors
I reboot and I can no longer ping the second wan IP.

I added the line following line to my start up /etc/init.d/S95custom-user-startup and this seems to work ok.  But is this the correct way to do it???
ip addr add 12.123.123.123/24 dev vlan1

Question #2  what is the /24 for in the command?  I have 255.255.255.240 with 11 usable wan IP's

Thanks for reading
Rick