yum install setuptool
???????????, ?????????.
??????
yum install system-config-network-tui
????????
yum install setuptool
???????????, ?????????.
??????
yum install system-config-network-tui
????????NAT ??, ???????, ??????iptables ?????.
?????????iptables???
????? NAT??, ???? nat PREROUTING -> filter FORWARD -> nat POSTROUTING (mangle?????, ??)
?CentOS 6.3 ???firewall????????Forward? port
????????nat table??? MASQUERADE ????????forward???
?????????????
#vi /etc/sysctl.conf
?? net.ipv4.ip_forward = 1
#sysctl -p
#iptables -t nat -A POSTROUTING -s 192.168.xx.xx/24 -o eth1 -j MASQUERADE
??????icmp, udp 53, tcp ALL ?????????
#iptables -A FORWARD -p icmp -j ACCEPT
#iptables -A FORWARD -m state --state NEW -m udp -p udp --dport 53 -j ACCEPT
#iptables -A FORWARD -m state --state NEW -m tcp -p tcp --dport 1:65535 -j ACCEPT
??FORWARD Policy???????????icmp, ????? icmp????.
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
#iptables -L --line-numbers
#iptables -D FORWARD 1
?????????????
#/etc/init.d/iptables save
????????????
#/etc/init.d/iptables restart
icmp reject ??? 1?icmp-net-unreachable 2?icmp-host-unreachable 3? icmp-port-unreachable 4?icmp-proto-unreachable 5?icmp-net-prohibited 6?icmp-host-prohibited