Iptables防火墙配置
iptables 服務(wù)的配置文件：/etc/sysconfig/iptables-config
系統(tǒng)默認(rèn)策略：? /etc/sysconfig/iptables
一? 查看現(xiàn)有iptables配置信息
?[root@Linux-180Desktop]# iptables -tfilter -L
Chain INPUT (policy ACCEPT)
target????prot opt source??????????????destination??? ?????
ACCEPT????all? --? anywhere???????????? anywhere??????????? state RELATED,ESTABLISHED
ACCEPT????icmp --? anywhere???????????? anywhere???????????
ACCEPT????all? --? anywhere???????????? anywhere???????????
ACCEPT????tcp? --? anywhere????????? ???anywhere??????????? state NEW tcp dpt:ssh
REJECT????all? --? anywhere???????????? anywhere??????????? reject-with icmp-host-prohibited
?
Chain FORWARD (policy ACCEPT)
target????prot opt source??????????????destination????????
REJECT????all? --? anywhere???????????? anywhere??????????? reject-with icmp-host-prohibited
?
Chain OUTPUT (policy ACCEPT)
target????prot opt source??????????????destination????????
[root@Linux-180 Desktop]# iptables -t nat -L
Chain PREROUTING (policy ACCEPT)
target????prot opt source??????????????destination????????
?
Chain POSTROUTING (policy ACCEPT)
target????prot opt source??????????????destination????????
?
Chain OUTPUT (policy ACCEPT)
target????prot opt source??????????????destination????
?
[root@Linux-180 Desktop]# service iptables status
Table: nat
Chain PREROUTING (policy ACCEPT)
num?target???? prot opt source?????????????? destination????????
?
Chain POSTROUTING (policy ACCEPT)
num?target???? prot opt source?????????????? destination????????
?
Chain OUTPUT (policy ACCEPT)
num?target???? prot opt source?????????????? destination????????
?
Table: filter
Chain INPUT (policy ACCEPT)
num?target???? prot opt source?????????????? destination????????
1???ACCEPT???? all? --?0.0.0.0/0??????????? 0.0.0.0/0??????? ???state RELATED,ESTABLISHED
2???ACCEPT???? icmp --? 0.0.0.0/0??????????? 0.0.0.0/0??????????
3???ACCEPT???? all? --?0.0.0.0/0??????????? 0.0.0.0/0??????????
4???ACCEPT???? tcp? --?0.0.0.0/0??????????? 0.0.0.0/0?????????? state NEW tcp dpt:22
5?? ?REJECT????all? --? 0.0.0.0/0??????????? 0.0.0.0/0?????????? reject-with icmp-host-prohibited
?
Chain FORWARD (policy ACCEPT)
num?target???? prot opt source?????????????? destination????????
1???REJECT???? all? --?0.0.0.0/0??????????? 0.0.0.0/0?????? ????reject-with icmp-host-prohibited
?
Chain OUTPUT (policy ACCEPT)
num?target???? prot opt source?????????????? destination?????
?
?
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清除規(guī)則和定義默認(rèn)策略
?
1清除鏈中所有已定義的規(guī)則
[root@Linux-180 Desktop]# iptables -L
Chain INPUT (policy ACCEPT)
target????prot opt source? ?????????????destination????????
ACCEPT????all? --? anywhere???????????? anywhere??????????? state RELATED,ESTABLISHED
ACCEPT????icmp --? anywhere???????????? anywhere???????????
ACCEPT????all? --? anywhere???????????? anywhere???????????
ACCEPT????tcp? --?anywhere???????????? anywhere??????????? state NEW tcp dpt:ssh
REJECT????all? --? anywhere???????????? anywhere??????????? reject-with icmp-host-prohibited
?
Chain FORWARD (policy ACCEPT)
target????prot opt source??????????????destination??? ?????
REJECT????all? --? anywhere???????????? anywhere??????????? reject-with icmp-host-prohibited
?
Chain OUTPUT (policy ACCEPT)
target????prot opt source??????????????destination????????
[root@Linux-180 Desktop]# iptables -F
[root@Linux-180 Desktop]# iptables -L
Chain INPUT (policy ACCEPT)
target????prot opt source??????????????destination????????
?
Chain FORWARD (policy ACCEPT)
target????prot opt source??????????????destination????????
?
Chain OUTPUT (policy ACCEPT)
target????prot opt source??? ???????????destination???
?
?
語法規(guī)則
?iptables?[-t table]? -P? [chain]?[ACCEPT|DROP]
-P 定義策略 ，ACCEPT 接受數(shù)據(jù)包?? DROP直接丟棄數(shù)據(jù)包，對數(shù)據(jù)包不作任何回應(yīng)
?
?
[root@Linux-180 Desktop]# iptables -P INPUT? DROP
[root@Linux-181 network-scripts]# ping172.16.40.180
PING 172.16.40.180 (172.16.40.180) 56(84)bytes of data.
^C
--- 172.16.40.180 ping statistics ---
8 packets transmitted, 0 received, 100%packet loss, time 7866ms
?
[root@Linux-180 Desktop]# iptables -P INPUT? ACCEPT
[root@Linux-181 network-scripts]# ping172.16.40.180
PING 172.16.40.180 (172.16.40.180) 56(84)bytes of data.
64 bytes from 172.16.40.180: icmp_seq=1ttl=64 time=0.284 ms
64 bytes from 172.16.40.180: icmp_seq=2ttl=64 time=0.248 ms
64 bytes from 172.16.40.180: icmp_seq=3ttl=64 time=0.223 ms
64 bytes from 172.16.40.180: icmp_seq=4ttl=64 time=0.224 ms
?
64 bytes from 172.16.40.180: icmp_seq=5ttl=64 time=0.344 ms
^C
--- 172.16.40.180 ping statistics ---
5 packets transmitted, 5 received, 0%packet loss, time 4771ms
rtt min/avg/max/mdev =0.223/0.264/0.344/0.048 ms
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設(shè)置數(shù)據(jù)包的基本判斷條件
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語法
iptables? [-AI 鏈]? [-io網(wǎng)絡(luò)接口]? [-p 協(xié)議] [-s 來源地址/子網(wǎng)掩碼] ?[-d 目標(biāo)地址/子網(wǎng)掩碼] [--sport 端口范圍]?[--dport 端口范圍] ?-j [ACCEPT/DROP/REJECT]
?????
如
??#iptables? -A INPUT? -i lo?-j ACCEPT
#iptables? -A INPUT? -i eth0?-s? 172.16.40.0/24 -j ACCEPT
#iptables? -A INPUT? -s?172.16.40.181? -d 172.16.40.180 –pTCP? --dport 22? -j ACCEPT
?
指定拒絕源目標(biāo)IP (在機(jī)器172.16.40.180上執(zhí)行)
#iptables? -A INPUT?-s? 172.16.40.181? -j?REJECT
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Linux機(jī)器，IP為172.16.4.181不可以ping通172.16.40.180機(jī)器
[root@Linux-181 network-scripts]# ping 172.16.40.180
PING 172.16.40.180 (172.16.40.180) 56(84) bytes of data.
From 172.16.40.180 icmp_seq=1 Destination Port Unreachable
From 172.16.40.180 icmp_seq=2 Destination Port Unreachable
From 172.16.40.180 icmp_seq=3 Destination Port Unreachable
^C
--- 172.16.40.180 ping statistics ---
3 packets transmitted, 0 received, +3 errors, 100% packet loss, time2434ms
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Windows機(jī)器，IP為172.16.4.80仍然可以ping通172.16.40.180機(jī)器
C:\Users\fengjw>ping 172.16.40.180
?
正在 Ping 172.16.40.180 具有 32 字節(jié)的數(shù)據(jù):
來自 172.16.40.180 的回復(fù): 字節(jié)=32 時間<1ms TTL=64
來自 172.16.40.180 的回復(fù): 字節(jié)=32 時間<1ms TTL=64
來自 172.16.40.180 的回復(fù): 字節(jié)=32 時間<1ms TTL=64
來自 172.16.40.180 的回復(fù): 字節(jié)=32 時間<1ms TTL=64
?
172.16.40.180 的 Ping 統(tǒng)計信息:
??? 數(shù)據(jù)包: 已發(fā)送 = 4，已接收 = 4，丟失 = 0 (0% 丟失)，
往返行程的估計時間(以毫秒為單位):
??? 最短 = 0ms，最長 = 0ms，平均 = 0ms
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拒絕使用本機(jī)的ssh服務(wù)
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# iptables? -A ?INPUT? -ptcp? --dport? 22? -j? REJECT
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圖形配置方式
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# system-config-firewall
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轉(zhuǎn)載于:https://blog.51cto.com/newcourage/1928435
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