iptables 无法连外网-白红宇

iptables 无法连外网

阅读量：5964 次

发布时间：2019-06-19

本文共 7732 字，大约阅读时间需要 25 分钟。

[root@v01-svn-test-server ~]# service iptables statusTable: filterChain INPUT (policy DROP)num  target     prot opt source               destination         1    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:3306 2    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:22 3    ACCEPT     all  --  127.0.0.1            127.0.0.1           4    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:80 Chain FORWARD (policy DROP)num  target     prot opt source               destination         Chain OUTPUT (policy DROP)num  target     prot opt source               destination         1    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:3306 2    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:22 state ESTABLISHED 3    ACCEPT     all  --  127.0.0.1            0.0.0.0/0           4    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:80 state ESTABLISHED

[root@v01-svn-test-server ~]# cat /etc/sysconfig/iptables# Generated by iptables-save v1.4.7 on Wed Jun  1 22:15:41 2016*filter:INPUT DROP [24:3081]:FORWARD DROP [0:0]:OUTPUT DROP [0:0]-A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT-A OUTPUT -p tcp -m tcp --sport 3306 -j ACCEPT-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -s 127.0.0.1/32 -d 127.0.0.1/32 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT -A OUTPUT -s 127.0.0.1/32 -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT COMMIT# Completed on Wed Jun  1 22:15:41 2016

[root@v01-svn-test-server sysconfig]# ping 192.168.1.17PING 192.168.1.17 (192.168.1.17) 56(84) bytes of data.ping: sendmsg: Operation not permitted

[root@v01-svn-test-server sysconfig]# cat iptables# Generated by iptables-save v1.4.7 on Wed Jun  1 22:15:41 2016*filter:INPUT DROP [24:3081]:FORWARD DROP [0:0]:OUTPUT DROP [0:0]-A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT-A OUTPUT -p tcp -m tcp --sport 3306 -j ACCEPT-A INPUT -p icmp -j ACCEPT-A OUTPUT -p icmp -j ACCEPT #增加这两行可以ping-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -s 127.0.0.1/32 -d 127.0.0.1/32 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT -A OUTPUT -s 127.0.0.1/32 -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT COMMIT# Completed on Wed Jun  1 22:15:41 2016

[root@v01-svn-test-server sysconfig]# ping -c 2 192.168.1.17PING 192.168.1.17 (192.168.1.17) 56(84) bytes of data.64 bytes from 192.168.1.17: icmp_seq=1 ttl=64 time=0.862 ms64 bytes from 192.168.1.17: icmp_seq=2 ttl=64 time=0.585 ms--- 192.168.1.17 ping statistics ---2 packets transmitted, 2 received, 0% packet loss, time 1002msrtt min/avg/max/mdev = 0.585/0.723/0.862/0.141 ms

[root@v01-svn-test-server sysconfig]# ping www.baidu.comping: unknown host www.baidu.com

[root@v01-svn-test-server sysconfig]# ping -c 2 211.155.89.150PING 211.155.89.150 (211.155.89.150) 56(84) bytes of data.64 bytes from 211.155.89.150: icmp_seq=1 ttl=52 time=2.78 ms64 bytes from 211.155.89.150: icmp_seq=2 ttl=52 time=2.58 ms--- 211.155.89.150 ping statistics ---2 packets transmitted, 2 received, 0% packet loss, time 1004msrtt min/avg/max/mdev = 2.581/2.683/2.786/0.114 ms

[root@v01-svn-test-server sysconfig]# ping -c 2 8.8.8.8PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.64 bytes from 8.8.8.8: icmp_seq=1 ttl=41 time=60.1 ms--- 8.8.8.8 ping statistics ---2 packets transmitted, 1 received, 50% packet loss, time 2001msrtt min/avg/max/mdev = 60.178/60.178/60.178/0.000 ms[root@v01-svn-test-server sysconfig]# ping -c 2 8.8.4.4PING 8.8.4.4 (8.8.4.4) 56(84) bytes of data.64 bytes from 8.8.4.4: icmp_seq=1 ttl=48 time=51.4 ms64 bytes from 8.8.4.4: icmp_seq=2 ttl=48 time=55.5 ms--- 8.8.4.4 ping statistics ---2 packets transmitted, 2 received, 0% packet loss, time 1057msrtt min/avg/max/mdev = 51.484/53.517/55.551/2.046 ms#8.8.8.8 和 8.8.4.4 是Google提供的免费DNS服务器的IP地址

[root@v01-svn-test-server sysconfig]# ifconfig eth0eth0      Link encap:Ethernet  HWaddr 52:54:00:38:04:CA            inet addr:192.168.1.35  Bcast:192.168.1.255  Mask:255.255.255.0          inet6 addr: fe80::5054:ff:fe38:4ca/64 Scope:Link          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1          RX packets:14664740 errors:0 dropped:12405 overruns:0 frame:0          TX packets:24212 errors:0 dropped:0 overruns:0 carrier:0          collisions:0 txqueuelen:1000           RX bytes:1575721510 (1.4 GiB)  TX bytes:3561803 (3.3 MiB)          Interrupt:11 Base address:0x2000 [root@v01-svn-test-server sysconfig]# routeKernel IP routing tableDestination     Gateway         Genmask         Flags Metric Ref    Use Iface192.168.1.0     *               255.255.255.0   U     0      0        0 eth0link-local      *               255.255.0.0     U     1002   0        0 eth0default         192.168.1.1     0.0.0.0         UG    0      0        0 eth0

DNS 端口53的设置：

[root@v01-svn-test-server sysconfig]# grep domain /etc/servicesdomain          53/tcp                          # name-domain serverdomain          53/udpdomaintime      9909/tcp                # domaintimedomaintime      9909/udp                # domaintime

[root@v01-svn-test-server sysconfig]# cat /etc/sysconfig/iptables# Generated by iptables-save v1.4.7 on Wed Jun  1 22:15:41 2016*filter:INPUT DROP [24:3081]:FORWARD DROP [0:0]:OUTPUT DROP [0:0]-A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT-A OUTPUT -p tcp -m tcp --sport 3306 -j ACCEPT-A INPUT -p icmp -j ACCEPT-A OUTPUT -p icmp -j ACCEPT #增加这两行可以ping-A INPUT -p udp --sport 53 -j ACCEPT #DNS端口53设置-A OUTPUT -p udp --dport 53 -j ACCEPT-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -s 127.0.0.1/32 -d 127.0.0.1/32 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT -A OUTPUT -s 127.0.0.1/32 -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT COMMIT# Completed on Wed Jun  1 22:15:41 2016

注意：上面的注释去掉，不然报错

[root@v01-svn-test-server sysconfig]# ping -c 2 www.baidu.comPING www.a.shifen.com (61.135.169.121) 56(84) bytes of data.64 bytes from 61.135.169.121: icmp_seq=1 ttl=54 time=2.19 ms64 bytes from 61.135.169.121: icmp_seq=2 ttl=54 time=1.88 ms--- www.a.shifen.com ping statistics ---2 packets transmitted, 2 received, 0% packet loss, time 1003msrtt min/avg/max/mdev = 1.880/2.035/2.190/0.155 ms

[root@v01-svn-test-server sysconfig]# service iptables statusTable: filterChain INPUT (policy DROP)num  target     prot opt source               destination         1    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:3306 2    ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0           3    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp spt:53 4    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:22 5    ACCEPT     all  --  127.0.0.1            127.0.0.1           6    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:80 Chain FORWARD (policy DROP)num  target     prot opt source               destination         Chain OUTPUT (policy DROP)num  target     prot opt source               destination         1    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:3306 2    ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0           3    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp dpt:53 4    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:22 state ESTABLISHED 5    ACCEPT     all  --  127.0.0.1            0.0.0.0/0           6    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp spt:80 state ESTABLISHED

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