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发表于 2022-7-3 08:23:21
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一、首次命令行新建iptables步骤
% Z" Q. V0 o* I& niptables -F #清除规则
8 D* ~8 t6 D9 Yiptables -X #删除自定义链- n1 a5 U( v7 u1 C+ D! E& o d! }
iptables -Z #清空计数. J" H* C" }3 V' z/ E2 \* R; P
iptables -A INPUT -p tcp --dport 22 -j ACCEPT #开放22端访问
" I g J C- x( \$ u9 O( _iptables -A INPUT -i lo ACCEPT #信任回环端口8 ~. l! x2 }" J' w& w$ L8 L' j* V/ o
iptables -A OUTPUT -o lo -j ACCEPT; s2 F8 \- ^: r" x6 u# ~( h
iptables -P INPUT DROP #设置INPUT链的默认规则为DROP; ] e; H, ?- m9 h+ y4 H" N
iptables -P OUTPUT ACCEPT #设置OUTPUT链的默认规则为DROP9 c1 V) Y, R: g; y: s; W9 z
iptables -P FORWARD DROP #设置FORWARD链的默认规则为DROP0 ~! ^, C: \. T+ q" A/ ], ~
iptables -A INPUT -p icmp --icmp-type 8 -j ACCEPT #容许PING包
: } @# ~. w' n) ], J7 v####开放信任网段* d2 u3 H2 A7 {: z$ i' g% W% L
iptables -A INPUT -s 192.168.1.100,192.168.2.0/24,192.168.3.0/24 -p all -j ACCEPT& m! N0 o7 T3 P: Y( S2 N7 ?, u' G
iptables -A INPUT -p tcp --dport 5900:5910 -j ACCEPT/ y2 S; |; v6 F
####开启对外服务端口6 }0 A/ w$ m" l. ^: b. o, P4 K( P" Q
iptables -A INPUT -p tcp --dport 80 -j ACCEPT- D. r# i+ ^ P; _" ^
iptables -A INPUT -p tcp -m multiport --dport 80,8080,443 -j ACCEPT
& m- p4 T D2 C$ f# }2 \! g& G1 S####容许关联的包经过
. V2 n0 W# A$ d* ]7 g8 z F& e' Siptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
! a) s3 z' K4 i% Z% n: H3 h) xiptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPTcentos1 c' O2 C! L, L8 K2 G
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二、查看当前运行状态的iptables的规则3 e$ A+ V* ^9 Q
iptables-save# D& Y* i& G( q4 ] ~+ N* v
三、查看默认iptables配置配置文件的规则3 z- o' V; z; N* U: k9 u
cat /etc/sysconfig/iptables
; o& J* n& C0 w$ \& ?. o四、保存iptables配置
7 B: a* i" s- R( F p. ciptables-save > /etc/sysconfig/iptables/ `+ s* x( g: I6 M+ j4 S
/etc/init.d/iptables save( d- P- ~9 ?' V
五、从新执行iptables配置文件# I. I* o+ B: Y6 f& E7 q
/etc/init.d/iptables reload- T1 ]+ H! U% Z( F. I) i" E
iptables-restore /etc/sysconfig/iptables, D" O9 A2 A" L# }4 R
六、启停防火墙
' K2 ?7 n2 ?# y9 V( b; q9 V/etc/init.d/iptables start
4 S7 M( N$ @" t+ Q5 F! v/etc/init.d/iptables stop- ~; X4 S1 ~0 E( y5 _
七、查看详细的规则配置5 N& W: R, Z! ?7 x2 f
[root@centos6 sysconfig]# iptables -nvL --line
2 O+ [) `1 h. gChain INPUT (policy DROP 0 packets, 0 bytes)
) C" U) Z5 @) O: p% {num pkts bytes target prot opt in out source destination* S C& a0 Z8 Z8 }% z
1 0 0 ACCEPT all -- lo 0.0.0.0/0 0.0.0.0/0$ A6 D6 o p; u( r8 ^) M
2 0 0 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 86 y, ^5 s3 ^1 A2 d) d: I& h. i* u8 ^
3 247 20668 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22; m7 P$ f7 H( b0 Q
4 411 49930 ACCEPT all -- 10.8.26.0/24 0.0.0.0/03 D A2 i |& o V
5 0 0 ACCEPT all -- 10.8.201.0/24 0.0.0.0/08 A) V" _) |# S% z. [/ X
6 0 0 ACCEPT all -- 10.9.1.1 0.0.0.0/0
4 C2 D7 Z/ i j! ^ E7 0 0 ACCEPT tcp -- 10.8.26.0/24 0.0.0.0/0 multiport dports 6888,11034
1 n* w8 S- l+ C' M0 l) x8 0 0 ACCEPT tcp -- 10.8.201.0/24 0.0.0.0/0 multiport dports 6888,11034 l& h y+ G Z X7 X" L0 G
9 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80$ x3 F. w/ n0 o* v! o9 ~
10 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpts:5900:59103 Q. W! B9 |$ Z( Z
11 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 8080,443
" ?, ~, k- s8 S7 U ~7 H12 0 0 ACCEPT all -- * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHEDtcp
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Chain FORWARD (policy DROP 0 packets, 0 bytes)
- c* w# q6 U7 h! I# i* \5 Gnum pkts bytes target prot opt in out source destinationide
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8 [8 b0 E* E7 C, C8 `+ DChain OUTPUT (policy ACCEPT 0 packets, 0 bytes)9 ?3 z, j' R! C2 B1 c
num pkts bytes target prot opt in out source destination* E( ^3 O0 C- S, {- j3 J7 i v
1 0 0 ACCEPT all -- lo 0.0.0.0/0 0.0.0.0/0: k% a* Q! U u { B! h5 g0 p
2 172 17712 ACCEPT all -- * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHEDoop9 e: F2 ^+ C' N0 t$ d: F6 ?
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八、基本配置文件示例& W' `& Q, W. m( T: f0 [
[root@centos6 sysconfig]# cat /etc/sysconfig/iptables$ R7 K- m3 T( u6 U4 k- y" Y4 U
# Generated by iptables-save v1.4.7 on Fri Jan 19 03:14:49 2018# q) O1 q; o l! F, V
*filter
7 {+ z3 U7 M$ O! c7 `:INPUT DROP [0:0]# K: }8 `8 C3 }! |9 L B
:FORWARD DROP [0:0]0 U; \! r7 d x! f( p9 U$ i, h
:OUTPUT ACCEPT [0:0]
- J* K. V+ Y2 _####Trust loopback interface and Ping2 R7 | S0 g! |* r2 q: W% W! Z1 h
-A INPUT -i lo -j ACCEPT
9 P% ?4 ~) d5 z- }9 G: @ s2 H1 f Y-A OUTPUT -o lo -j ACCEPT
9 D {+ z7 S2 G$ |8 j-A INPUT -p icmp --icmp-type 8 -j ACCEPT8 u$ p3 Q5 j6 g7 B" u& ?
####Trust Network
% c# g) ], u* c; Z' p6 L. Z5 A-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
: R7 n! G$ z" J9 W2 E( q: ~/ `-A INPUT -s 10.8.26.0/24 -j ACCEPT1 M; L' `6 G3 }8 @& U
-A INPUT -s 10.8.201.0/24 -j ACCEPT! P8 e( m2 j' c( ?2 Y% m
-A INPUT -s 10.9.1.1/32 -j ACCEPT# s/ @" O7 |! Q, o
-A INPUT -s 10.8.26.0/24,10.8.201.0/24 -p tcp -m multiport --dport 6888,11034 -j ACCEPT! B! v2 L: h* z) ^% B3 u* c
####Open Port
0 j2 |# F% B& P5 Y8 t-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
5 u: Y g4 Q& O0 q! v4 G% J; H1 V-A INPUT -p tcp -m tcp --dport 5900:5910 -j ACCEPT4 B$ |2 q$ T5 i* b# q
-A INPUT -p tcp -m multiport --dports 8080,443 -j ACCEPT
% s% B1 d0 o- ^1 \####Relate Packets7 k# t( q# |6 P& Q) Z% l
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT4 w3 c% @* f; |# t) |
-A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT; b% R3 \7 l6 | V+ N; C! P
COMMIT
; V- e4 [) {% `1 [" X* N/ D# Completed on Fri Jan 19 03:14:49 2018命令行 |
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发表于 2022-7-3 08:18:44