\u4ee5\u4e0b\u5185\u5bb9\u7ecf\u8fc7\u672c\u4eba\u65e0\u6570\u6b21\u5931\u8d25\u6478\u7d22\u51fa\u6765\uff0c\u53ef\u4ee5\u505a\u4e00\u4e2a\u811a\u672c\u81ea\u52a8\u90e8\u7f72\u3002
\n(markdown\u7528\u7684\u4e0d\u592a\u719f\u7ec3)<\/p>\n
\u9996\u5148\u8981\u4fee\u590dLinode Centos6.5\u7684iptables (\u5e26+\u53f7\u7684\u884c\u662f\u540e\u6dfb\u52a0\u7684)<\/p>\n
vi \/etc\/init.d\/iptables<\/p>\n
echo -n $\"${IPTABLES}: Setting chains to policy $policy: \"\r\nret=0\r\nfor i in $tables; do\r\necho -n \"$i \"\r\ncase \"$i\" in\r\n +++++++++++++++++++\r\nsecurity)\r\n$IPTABLES -t filter -P INPUT $policy \\\r\n && $IPTABLES -t filter -P OUTPUT $policy \\\r\n && $IPTABLES -t filter -P FORWARD $policy \\\r\n || let ret+=1\r\n;;\r\n +++++++++++++++++++\r\n raw)\r\n $IPTABLES -t raw -P PREROUTING $policy \\\r\n && $IPTABLES -t raw -P OUTPUT $policy \\\r\n || let ret+=1\r\n ;;\r\n<\/code><\/pre>\n\u5b89\u88c5EPEL\u6e90<\/p>\n
rpm -ivh http:\/\/dl.fedoraproject.org\/pub\/epel\/6\/x86_64\/epel-release-6-8.noarch.rpm<\/a>
\nyum update<\/p>\n\u4fee\u6539sysctl<\/p>\n
sed -i -e ‘s\/net.ipv4.ip_forward = 0\/net.ipv4.ip_forward = 1\/g’ \/etc\/sysctl.conf
\nsed -i -e ‘s\/net.ipv4.conf.default.rp_filter = 1\/net.ipv4.conf.default.rp_filter = 0\/g’ \/etc\/sysctl.conf
\nsed -i -e ‘s\/net.ipv4.tcp_syncookies = 1\/net.ipv4.tcp_syncookies = 0\/g’ \/etc\/sysctl.conf
\nsed -i -e ‘$a # Settings for OpenSwan IPSec implementation’ \/etc\/sysctl.conf
\nsed -i -e ‘$a net.ipv4.conf.all.send_redirects = 0’ \/etc\/sysctl.conf
\nsed -i -e ‘$a net.ipv4.conf.default.send_redirects = 0’ \/etc\/sysctl.conf
\nsed -i -e ‘$a net.ipv4.conf.all.accept_redirects = 0’ \/etc\/sysctl.conf
\nsed -i -e ‘$a net.ipv4.conf.default.accept_redirects = 0’ \/etc\/sysctl.conf
\nsed -i -e ‘$a net.core.xfrm_larval_drop = 1’ \/etc\/sysctl.conf
\nsysctl -p<\/p>\n
iptables\u6dfb\u52a0\u89c4\u5219\uff08\u6709\u4e9b\u53ef\u80fd\u91cd\u4e86 \u591a\u591a\u76ca\u5584\uff09<\/p>\n
iptables -t nat -A POSTROUTING -s 192.168.23.0\/24 -j SNAT –to-source ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk 'NR==1 { print $1}'<\/code>
\niptables -A FORWARD -p tcp –syn -s 192.168.23.0\/24 -j TCPMSS –set-mss 1356
\niptables -A INPUT -p udp -m state –state NEW -m udp –dport 500 -j ACCEPT
\niptables -A INPUT -p udp -m state –state NEW -m udp –dport 1701 -j ACCEPT
\niptables -A INPUT -p udp -m state –state NEW -m udp –dport 1812 -j ACCEPT
\niptables -A INPUT -p udp -m state –state NEW -m udp –dport 1813 -j ACCEPT
\niptables -A INPUT -p udp -m state –state NEW -m udp –dport 1814 -j ACCEPT
\niptables -A POSTROUTING -s 192.168.23.0\/255.255.255.0 -o eth0 -j MASQUERADE
\niptables -A POSTROUTING -s 192.168.233.0\/255.255.255.0 -o eth0 -j MASQUERADE
\niptables -A INPUT -i lo -j ACCEPT
\niptables -A INPUT -i ! lo -d 127.0.0.0\/8 -j REJECT
\niptables -A INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT
\niptables -A OUTPUT -j ACCEPT
\niptables -A INPUT -p gre -j ACCEPT
\niptables -A INPUT -p tcp -m state –state NEW –dport 1723 -j ACCEPT
\niptables -A INPUT -p icmp -m icmp –icmp-type 8 -j ACCEPT
\niptables -A INPUT -j REJECT
\niptables -A INPUT -p udp -m state –state NEW -m udp –dport 4500 -j ACCEPT
\niptables -I INPUT -p udp -m multiport –dport 1701,4500,500 -j ACCEPT
\niptables –table nat –append POSTROUTING –jump MASQUERADE
\niptables -t nat -A POSTROUTING -s 192.168.233.0\/24 -o eth0 -j MASQUERADE
\niptables -t nat -A POSTROUTING -s 192.168.233.0\/24 -j SNAT –to-source ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk 'NR==1 { print $1}'<\/code>
\nservice iptables save
\nservice iptables restart<\/p>\n\u5b89\u88c5PPTP<\/p>\n
yum remove -y pptpd ppp
\nrm -rf \/etc\/pptpd.conf
\nrm -rf \/etc\/ppp
\nrm -rf \/dev\/ppp
\nyum install -y ppp iptables
\nrpm -Uvh http:\/\/poptop.sourceforge.net\/yum\/stable\/rhel6\/pptp-release-current.noarch.rpm<\/a>
\nyum install -y pptpd
\nmknod \/dev\/ppp c 108 0
\necho “mknod \/dev\/ppp c 108 0” >> \/etc\/rc.local
\necho “localip 192.168.23.1” >> \/etc\/pptpd.conf
\necho “remoteip 192.168.23.2-254” >> \/etc\/pptpd.conf
\necho “ms-dns 8.8.8.8” >> \/etc\/ppp\/options.pptpd
\necho “ms-dns 8.8.4.4” >> \/etc\/ppp\/options.pptpd
\n\/etc\/init.d\/pptpd restart
\nchkconfig pptpd on
\nchkconfig iptables on<\/p>\n\u5b89\u88c5L2TP\uff08\u4f7f\u7528\u4e86racoon \u5bf9IOS WP8\u652f\u6301\u6027\u6bd4openswan\u597d\uff09<\/p>\n