blokada wszystkiego oprócz PPPoE na Ubiquiti

ebtables -D FORWARD -j FIREWALL
ebtables -A FORWARD -i ath0 -p PPP_SES -s Unicast -d Unicast -j ACCEPT
ebtables -A FORWARD -o ath0 -p PPP_SES -s Unicast -d Unicast -j ACCEPT
ebtables -A FORWARD -i ath0 -p PPP_DISC -s Unicast -d Unicast -j ACCEPT
ebtables -A FORWARD -o ath0 -p PPP_DISC -s Unicast -d Unicast -j ACCEPT
ebtables -A FORWARD -o ath0 -p PPP_DISC -s Unicast -d Broadcast -j ACCEPT
ebtables -P FORWARD DROP