Adding static ARP entry

Got a Netgear WPN824N router and am able to Telnet into it, finally. I have very liittle knowledge of Linux and the commands and such. Anyway I tried adding a static ARP entry using the arp command like this

arp -i br0 192.168.1.x 00:00:00:00:00:00

However that didn't work. I am trying to get WOL to work over WAN and read that this was the only way to do it.

I was reading that I should add it to the ect/ethers file but I don't see that file nor know how to add it. Here is what is in that dir.

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ath                  hotplug.d            preinit
ath.orig            hotplug2-init.rules  preinit.arch
banner              icon.ico            profile
config              init.d              protocols
crontabs            inittab              rc.common
dnsmasq.conf        ipkg.conf            rc.d
email                large.ico            resolv.conf
ethertypes          lld2d.conf          shells
functions.sh        modules.d            sysctl.conf
group                mtab                wpa2
hostapd.conf        passwd              wpa2.orig
hosts                ppp

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