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This article mainly introduces "the usage of Linux basic command iptables-save". In daily operation, I believe many people have doubts about the usage of Linux basic command iptables-save. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "the usage of Linux basic command iptables-save"! Next, please follow the editor to study!

Iptables-save

The iptables-save directive exports the current iptables configuration in the kernel to standard output. Output to a file is directed through the IO redirect feature.

The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.

1. Grammar

Iptables-save [options]

2. List of options

Option

Description

-c |-- counters

Output current packet counter and byte counter information

-t |-- table

Specify the table to export

-M |-- modprobemodprobe_program

Specifies the path to the modem probe. By default, iptables-Save checks "/ proc/sys/kernel/modprobe" to determine the path to the executable.

3. Examples

1) display iptables configuration

[root@localhost ~] # iptables-save-c / / display counter information

# Generated by iptables-save v1.4.7 on Sun Sep 30 16:20:14 2018

* filter

: INPUT ACCEPT [0:0]

: FORWARD ACCEPT [0:0]

: OUTPUT ACCEPT [1802:148673]

[14011 state RELATED,ESTABLISHED 18173274]-An INPUT-m state-- state RELATED,ESTABLISHED-j ACCEPT

[27ACCEPT 2268]-An INPUT-p icmp-j ACCEPT

[585 ACCEPT 30820]-An INPUT-I lo-j ACCEPT

[4526 eth+ 2073410]-An INPUT-I eth+-j ACCEPT

[0:0]-An INPUT-I wlan+-j ACCEPT

[0:0]-An INPUT-p tcp-m state-- state NEW-m tcp-- dport 22-j ACCEPT

[0:0]-An INPUT-p tcp-m state-- state NEW-m tcp-- dport 80-j ACCEPT

2) Export the information of the specified table

[root@localhost ~] # iptables-save-t nat / / output the information of the nat table

# Generated by iptables-save v1.4.7 on Sun Sep 30 16:21:17 2018

* nat

: PREROUTING ACCEPT [6181:2947647]

: POSTROUTING ACCEPT [573:30328]

: OUTPUT ACCEPT [2466:479800]

-A POSTROUTING-o eth+-j MASQUERADE

-A POSTROUTING-o wlan+-j MASQUERADE

COMMIT

# Completed on Sun Sep 30 16:21:17 2018

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