1 iptables -t filter -A INPUT -m esp --espspi 0x100 -j ACCEPT
2 iptables -t filter -A INPUT -m esp --espspi ! 0x101 -j DROP
3 iptables -t filter -A INPUT -m esp --espspi 0x102 -j REJECT
4 iptables -t filter -A INPUT -m esp --espspi 0x105 -j REJECT
5 iptables -t filter -A INPUT -m esp --espspi 0x200:0x2ff -j REJECT