password=<router password>
mac=<mac to add>
router=<router ip or dns name>
wget --http-user bla \
--http-password "${password}" \
--post-data 'i1_3_6_1_4_1_937_3_1_3_2_2_1_4_*=5&m1_3_6_1_4_1_937_3_1_3_2_2_1_2_*='"${mac}"'&i1_3_6_1_4_1_937_3_1_3_2_2_1_3_*=1&i1_3_6_1_4_1_937_3_1_3_2_2_1_4_*=1' \
'http://'"${router}"'/cgi-bin/setobject?/lib/popup/close_window.shtml'

router=<router ip or dns name>
public_ip="`snmptable -c public -v 2c -CH "${router}" .1.3.6.1.2.1.4.20 \
                               | awk ' $2 == 7 {print $1}'`"