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发表于 2022-7-3 08:19:16
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1、首次命令行新建iptables步骤
; h! a% [# l4 V( I: K/ hiptables -F #清除规则
- T$ k+ I$ v1 L2 C, H2 y( r6 u1 hiptables -X #删除自定义链7 d/ M; b! W* t0 q" X( F
iptables -Z #清空计数
: U: @1 a4 w/ M$ Q1 h. |: ^) Miptables -A INPUT -p tcp --dport 22 -j ACCEPT #开放22端访问0 f: `- ~! i7 D' A3 H6 O
iptables -A INPUT -i lo ACCEPT #信任回环端口
% c: O5 D% g5 diptables -A OUTPUT -o lo -j ACCEPT
$ y# F4 }$ y, V1 {) l6 t5 {$ Uiptables -P INPUT DROP #设置INPUT链的默认规则为DROP
D! N; X2 z1 Biptables -P OUTPUT ACCEPT #设置OUTPUT链的默认规则为DROP
( m u5 P4 O8 _) T; p/ w: F- ziptables -P FORWARD DROP #设置FORWARD链的默认规则为DROP
: v" K1 u# Q4 z" @2 Uiptables -A INPUT -p icmp --icmp-type 8 -j ACCEPT #允许PING包: h& T% y0 S% Z& `7 J
####开放信任网段
) q7 ^# L/ b& ]( j+ a7 kiptables -A INPUT -s 192.168.1.100,192.168.2.0/24,192.168.3.0/24 -p all -j ACCEPT o+ a8 U% H1 P$ ~- P8 _" M; \
iptables -A INPUT -p tcp --dport 5900:5910 -j ACCEPT
8 O/ ?; C8 \5 H: i* I####开启对外服务端口% y) S, \" k7 j( A' f9 u8 ?: v
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
& m% y$ J/ @" |4 S/ E+ n1 aiptables -A INPUT -p tcp -m multiport --dport 80,8080,443 -j ACCEPT8 T* x9 `& c% O1 J5 e. A- }5 c( c
####允许关联的包通过, s. q' u9 Q* G7 Q. S8 c: |
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
4 F5 `; t" Q: z& wiptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
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+ v7 o. W) ?4 Q+ K& q- y2、查看当前运行状态的iptables的规则
0 V. ]2 R, W+ Kiptables-save
) m3 H. x- \& s3、查看默认iptables配置配置文件的规则
, H. M {6 e4 [, X7 Y4 u. [cat /etc/sysconfig/iptables3 U6 l0 d q( W5 K1 l; w
4、保存iptables配置2 {3 F, ]! `8 N% i! \
iptables-save > /etc/sysconfig/iptables+ q( {% a, B4 `, ]6 T
/etc/init.d/iptables save( y$ M' G) h& Y2 s/ U8 {; i, p
5、重新执行iptables配置文件1 a3 `" d3 S1 R. u
/etc/init.d/iptables reload0 p2 h" ~6 X8 M" q0 u- j
iptables-restore /etc/sysconfig/iptables8 d1 `$ S7 J6 D: ]# b
6、启停防火墙8 D4 p, p+ z- T& P5 l6 G
/etc/init.d/iptables start% G2 G" v$ g% x9 P
/etc/init.d/iptables stop& z) } ^% d9 V9 A
7、查看详细的规则配置
4 h+ Y2 ]. e( M1 }[root@centos6 sysconfig]# iptables -nvL --line
" Z. g( k- L: P8 T8 uChain INPUT (policy DROP 0 packets, 0 bytes) x0 D$ y3 s( Q. c g+ ^8 \* x
num pkts bytes target prot opt in out source destination
0 w* q0 s' A+ x. ~/ C7 H1 0 0 ACCEPT all -- lo 0.0.0.0/0 0.0.0.0/0! z* h, |2 \3 A
2 0 0 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 8
7 m( Q7 z; w9 D! k) _3 247 20668 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
# |) p0 p& v( S" f4 X4 411 49930 ACCEPT all -- 10.8.26.0/24 0.0.0.0/0
) u% _0 g. Y1 l3 ?% E3 [' C5 0 0 ACCEPT all -- 10.8.201.0/24 0.0.0.0/0
9 P( c5 F& V+ B6 0 0 ACCEPT all -- 10.9.1.1 0.0.0.0/0# s0 N- M9 ~1 L4 o) E9 {
7 0 0 ACCEPT tcp -- 10.8.26.0/24 0.0.0.0/0 multiport dports 6888,11034
/ i m! U9 T, R M8 0 0 ACCEPT tcp -- 10.8.201.0/24 0.0.0.0/0 multiport dports 6888,11034# I3 f9 i; c- |- P( E/ a( }2 a! A
9 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
) Y2 k5 D, p6 F5 ?10 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpts:5900:5910
, f4 R# T. r0 K7 `9 m11 0 0 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 8080,443
1 v6 G8 ]2 \# [ k q3 p# P7 `12 0 0 ACCEPT all -- * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED0 p* D# n4 R+ U: Y9 N e) y
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Chain FORWARD (policy DROP 0 packets, 0 bytes)2 i3 \& X& e: N" S0 K2 K
num pkts bytes target prot opt in out source destination2 A! H' f2 C7 N( }8 g3 {
+ K5 t( W5 {+ \0 K1 qChain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
) @7 Y) |8 N+ G P5 enum pkts bytes target prot opt in out source destination
2 ]# v# }8 ? l6 }) L* G0 \1 0 0 ACCEPT all -- lo 0.0.0.0/0 0.0.0.0/0
" p5 T3 s# V5 n3 j2 172 17712 ACCEPT all -- * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
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8、基本配置文件示例
2 |( X( ~1 A( B8 |2 a5 |5 k[root@centos6 sysconfig]# cat /etc/sysconfig/iptables; C) U! ]" L/ h% a1 M1 D# @
# Generated by iptables-save v1.4.7 on Fri Jan 19 03:14:49 2018
) O G% [9 K) r y) T*filter
( R7 ]) ` }. \6 L:INPUT DROP [0:0]3 f: Q9 k4 b8 D( l; z
:FORWARD DROP [0:0]
; l' H4 M8 g/ p: `7 V2 [:OUTPUT ACCEPT [0:0]
& m) K. W4 a$ F+ w$ F L0 a$ h####Trust loopback interface and Ping
" |1 s2 u% N; D) ]) l! \/ D$ B-A INPUT -i lo -j ACCEPT+ M0 |" R" f- L7 D# M/ x S" W
-A OUTPUT -o lo -j ACCEPT! B8 z0 j' o' _: r0 F% d3 F
-A INPUT -p icmp --icmp-type 8 -j ACCEPT# T& K$ H4 J" n. y$ h
####Trust Network2 ]1 E; _( }7 \: X
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT! W! [9 T e' G" F, S3 E
-A INPUT -s 10.8.26.0/24 -j ACCEPT
; n! P8 W1 X/ y7 I0 A-A INPUT -s 10.8.201.0/24 -j ACCEPT7 B1 v' ~) }) w
-A INPUT -s 10.9.1.1/32 -j ACCEPT) l1 s& J4 d% o' K% U
-A INPUT -s 10.8.26.0/24,10.8.201.0/24 -p tcp -m multiport --dport 6888,11034 -j ACCEPT0 c3 @. a, C2 j6 O3 ~# T% ^( E# K9 b
####Open Port. d) F) F, t: l4 i1 ?
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT% V( q$ R6 h3 u
-A INPUT -p tcp -m tcp --dport 5900:5910 -j ACCEPT
0 H, U6 ^ Q* d' I! ~6 b. g) g-A INPUT -p tcp -m multiport --dports 8080,443 -j ACCEPT! y2 {' Z, M; s
####Relate Packets& P; e) x% _- A! l
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
* D5 s3 c; e/ v-A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT0 C$ x9 V) ?+ j5 p0 I- v! ?* }$ {3 s
COMMIT$ i% ^5 t4 h- c& I" ?' U
# Completed on Fri Jan 19 03:14:49 2018 |
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