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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 u' Y t& H- i+ t9 o
iptables -F #清除规则$ L% C! p. i, Q `$ f
iptables -X #删除自定义链; q) N: t* j1 t4 m: ?/ y/ h
iptables -Z #清空计数
7 Z- O( P3 j r# A6 B8 e' H; S5 g' ^iptables -A INPUT -p tcp --dport 22 -j ACCEPT #开放22端访问
( A& d- F0 |* b/ U* j: uiptables -A INPUT -i lo ACCEPT #信任回环端口
7 d* [4 A2 [* `3 viptables -A OUTPUT -o lo -j ACCEPT& K3 M/ @0 @3 z" ?& k
iptables -P INPUT DROP #设置INPUT链的默认规则为DROP
) f e ~; m' m( s1 e( Tiptables -P OUTPUT ACCEPT #设置OUTPUT链的默认规则为DROP
5 }( Q6 X( r( Y$ q$ e: K' Giptables -P FORWARD DROP #设置FORWARD链的默认规则为DROP# u; z2 |* @ ~1 e' O3 z
iptables -A INPUT -p icmp --icmp-type 8 -j ACCEPT #容许PING包! k* F' l9 z6 h* N- E: X
####开放信任网段* E5 U7 _# L- e# O" U: q
iptables -A INPUT -s 192.168.1.100,192.168.2.0/24,192.168.3.0/24 -p all -j ACCEPT
% E4 t: w3 z+ F; h- jiptables -A INPUT -p tcp --dport 5900:5910 -j ACCEPT3 Y; X6 N( Q$ x. n" @3 |: c- y. j
####开启对外服务端口
7 s# k) x, Z5 |; M. E% k& ?iptables -A INPUT -p tcp --dport 80 -j ACCEPT
7 H* K" `/ M, K. ^, Z" S* z* Xiptables -A INPUT -p tcp -m multiport --dport 80,8080,443 -j ACCEPT
- x4 c8 H0 Y/ C$ z) N' h####容许关联的包经过4 F0 s, Y+ N1 V9 ?% U
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT% {4 b- w8 B" L2 I
iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPTcentos, Y! \1 s% Q$ U. [4 L- m: A
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二、查看当前运行状态的iptables的规则
. ?+ S$ k5 z1 A L' {7 f# l# ~- {4 a! ciptables-save
) t# y. ^, M% P ], h+ z三、查看默认iptables配置配置文件的规则
$ E5 I8 ?+ l/ @' }$ B6 V% \cat /etc/sysconfig/iptables
6 |, r5 P- g9 T) @, O5 e- z四、保存iptables配置0 D8 E+ {1 H* h0 W
iptables-save > /etc/sysconfig/iptables
: G% E, `+ ]7 p# ]/etc/init.d/iptables save
' y% \/ D0 A5 w$ }" O; A五、从新执行iptables配置文件6 o, E0 U) G* v- {
/etc/init.d/iptables reload. U+ [ G. F. F0 k
iptables-restore /etc/sysconfig/iptables8 h, E6 V1 F; V3 |
六、启停防火墙
4 B6 p, f- \' o! c9 ^! J/etc/init.d/iptables start
% a/ Z8 f$ ~- ^' T6 y/etc/init.d/iptables stop
( a( \) w! b8 D' l七、查看详细的规则配置3 l3 k0 ~* q* h7 }" ^
[root@centos6 sysconfig]# iptables -nvL --line
: F/ w- m6 Y: J$ ?# XChain INPUT (policy DROP 0 packets, 0 bytes)9 a1 }8 u) w, f0 S& h
num pkts bytes target prot opt in out source destination
9 G' }# }' G; v/ I* R$ i/ d1 0 0 ACCEPT all -- lo 0.0.0.0/0 0.0.0.0/0
' \& d. u# N: t; F0 a [- Z2 0 0 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 8, M+ O5 L3 j- {# h
3 247 20668 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
' o; \, S/ `; s, ?4 411 49930 ACCEPT all -- 10.8.26.0/24 0.0.0.0/0- ]* r; v: G" h
5 0 0 ACCEPT all -- 10.8.201.0/24 0.0.0.0/0) }/ i4 L: m `& @4 q7 J3 h' e
6 0 0 ACCEPT all -- 10.9.1.1 0.0.0.0/09 C+ S& g3 V9 K, {% G* q) R* r5 K
7 0 0 ACCEPT tcp -- 10.8.26.0/24 0.0.0.0/0 multiport dports 6888,11034
9 Q* v9 l3 @" n* L# N$ g8 0 0 ACCEPT tcp -- 10.8.201.0/24 0.0.0.0/0 multiport dports 6888,11034
" N8 G' p3 @% P9 D9 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80! P1 Z% \/ x7 a0 I
10 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpts:5900:5910% H$ {5 X& u X& t/ W
11 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 8080,443
# E4 ]4 K% r. m" {( T4 P% A; k12 0 0 ACCEPT all -- * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHEDtcp
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5 a* A& Y2 G$ }. O6 s6 F2 x7 [Chain FORWARD (policy DROP 0 packets, 0 bytes)
5 q; F9 k4 t8 V% X7 J$ y$ M3 ]$ Mnum pkts bytes target prot opt in out source destinationide
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' z7 T& S! s: f$ @3 `7 w5 ?4 P5 FChain OUTPUT (policy ACCEPT 0 packets, 0 bytes)* l t5 W I6 M3 n* O( R* } ^
num pkts bytes target prot opt in out source destination" Z. n+ d" Y# P
1 0 0 ACCEPT all -- lo 0.0.0.0/0 0.0.0.0/0
' t$ {! \8 ]+ L K! _0 S5 o$ Z2 172 17712 ACCEPT all -- * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHEDoop
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$ D! L* K' p0 R4 t八、基本配置文件示例
3 a" B( h: ]' b* y+ U* h[root@centos6 sysconfig]# cat /etc/sysconfig/iptables! n$ h2 C* p! G8 L% r3 T
# Generated by iptables-save v1.4.7 on Fri Jan 19 03:14:49 2018% t+ _ G; i+ s+ |- ~: m* E
*filter
, f6 J, d: |9 |:INPUT DROP [0:0]
8 d2 f/ L- `, K& @:FORWARD DROP [0:0]4 i9 M" _( h G7 i! X
:OUTPUT ACCEPT [0:0]
; d6 K5 i1 w' n; E; H4 B####Trust loopback interface and Ping. o. T; O! x) P
-A INPUT -i lo -j ACCEPT4 S( p! B6 v3 v7 f' j
-A OUTPUT -o lo -j ACCEPT+ r* k' r+ Z, o0 o) X! x
-A INPUT -p icmp --icmp-type 8 -j ACCEPT
" m: Y1 H' K/ s3 ]####Trust Network
4 r+ x6 Q7 ~2 C-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
+ Y# D! m' z# H3 t: ?( A-A INPUT -s 10.8.26.0/24 -j ACCEPT1 s, c# ~' i0 w: N: c# | z
-A INPUT -s 10.8.201.0/24 -j ACCEPT _, k7 D$ y8 X3 W2 t+ q& c( t2 J
-A INPUT -s 10.9.1.1/32 -j ACCEPT/ m. t3 @" z% y
-A INPUT -s 10.8.26.0/24,10.8.201.0/24 -p tcp -m multiport --dport 6888,11034 -j ACCEPT
" O$ F, g! q, h. z1 o& t$ b####Open Port% k! ]# ~+ j! T% M+ u4 T' \
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
- C2 h* Y( `8 u r& n/ v-A INPUT -p tcp -m tcp --dport 5900:5910 -j ACCEPT
1 p2 d; Q) m) S. n" L-A INPUT -p tcp -m multiport --dports 8080,443 -j ACCEPT
0 d5 X9 L: F6 N! A5 U; F####Relate Packets
0 ?9 d8 r D1 E2 {-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT1 x0 I( ~2 i- b* s8 k' V2 Y3 O8 t
-A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
Y: J9 k7 d5 i6 ~COMMIT; D0 ?) t" y; b2 u; a4 x
# 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