???????????????Ч?????????/etc/sysctl.conf??????????????????У?

????net.ipv4.ip_default_ttl = 128

???????????????ping 192.168.0.1??TTL???????128???

?????????????3389????22????????????????????????Windows?????????TCPЭ???3389???????????????Linux???????TCPЭ???22?????????м???????SSH????

???????????????????iptables??????22????SSH??????÷??????IP??費??TCP 22????????

????#iptables -I INPUT -s ! xx.xx.xx.xx -p tcp --dport 22 -j DROP

????????iptables??????????TCP 3389???????????????3389?????????????Linux??α?????????????TCP 3389???????????￡?

????#echo 1 > /proc/sys/net/ipv4/ip_forward
????#iptables -t nat -I PREROUTING -p tcp --dport 3389 -j DNAT --to xx.xx.xx.xx
????#iptables -t nat -I POSTROUTING -p tcp --dport 3389 -j MASQUERADE

???????????????????????????;??????????????TCP 3389??xx.xx.xx.xx;????????????????????????“????·”???????????????????????????????????????Ч???????????????????/etc/rc.local????С?

??????????????????????????????????????? 22???????????????α??? 3389???????????????ж???????????????

??????????netcraft

????netcraft???????????????????棬????????? TCP 80???????????????????????????Web????????????????????(Uptime)???????

???????????????????? netcraft???????????Ч????? netcraft????????iptables??????α????netcraft?????ж????????

????#iptables -t nat -I PREROUTING -s 195.92.95.0/24 -p tcp --dport 80 -j DNAT --to
????xx.xx.xx.xx
????#iptables -t nat -I POSTROUTING -s 195.92.95.0/24 -p tcp --dport 80 -j MASQUERADE

???????????????????netcraft????????????????????????????????ν??????????????

?????塢С??

????????????????????????????????????????????????????????????????????????????????????“???????????С??”??????????????????????????·??