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描述:
一台服务器,操作系统是Red Hat 9 , 有两块网卡,eth0为外网(221.222.223.224),eth1为内网(172.16.2.9). DNS:219.155.33.132 和 202.99.68.66
目前想通过这台服务器上外网,我的ip是172.16.2.100
想通过iptables实现。
目前的做法是:
echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 172.16.2.100 -o eth0 -j MASQUERADE
更改后的iptables规则是:
[root]# iptables-save
# Generated by iptables-save v1.2.7a on Fri Nov 3 17:03:57 2006
*nat
REROUTING ACCEPT [82461:5215806]
OSTROUTING ACCEPT [147151:8824618]
:OUTPUT ACCEPT [147151:8824618]
-A POSTROUTING -s 172.16.2.100 -o eth0 -j MASQUERADE
COMMIT
# Completed on Fri Nov 3 17:03:57 2006
# Generated by iptables-save v1.2.7a on Fri Nov 3 17:03:57 2006
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [9186231:8737984823]
:RH-Lokkit-0-50-INPUT - [0:0]
-A INPUT -j RH-Lokkit-0-50-INPUT
-A FORWARD -j RH-Lokkit-0-50-INPUT
-A RH-Lokkit-0-50-INPUT -s 219.155.33.132 -p udp -m udp --sport 53 --dport 1025:65535 -j ACCEPT
-A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 80 --tcp-flags SYN,RST,ACK SYN -j ACCEPT
-A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 21 --tcp-flags SYN,RST,ACK SYN -j ACCEPT
-A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 22 --tcp-flags SYN,RST,ACK SYN -j ACCEPT
-A RH-Lokkit-0-50-INPUT -i lo -j ACCEPT
-A RH-Lokkit-0-50-INPUT -i eth0 -j ACCEPT
-A RH-Lokkit-0-50-INPUT -i eth1 -j ACCEPT
-A RH-Lokkit-0-50-INPUT -s 202.99.68.66 -p udp -m udp --sport 53 -j ACCEPT
-A RH-Lokkit-0-50-INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j REJECT --reject-with icmp-port-unreachable
-A RH-Lokkit-0-50-INPUT -p udp -m udp -j REJECT --reject-with icmp-port-unreachable
COMMIT
# Completed on Fri Nov 3 17:03:57 2006
我的机器的ip设置为172.16.2.100 网关为:172.16.2.9 DNS:219.155.33.132
这时我的机器可以ping 通DNS , 在ie里可以通过ip地址访问网站,但是不能通过域名访问(能ping通域名服务器)
请给为给分析一下,如何解决,多谢!
[ 本帖最后由 james70 于 2006-11-5 07:55 编辑 ] |
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