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and then add them on the basis of the previous rules. Add two rules first. Iptables-a input-p tcp -- dport 22-j ACCEPT # Add an INPUT stream rule for open port 22Iptables-a output-p tcp -- sport 22-j ACCEPT # Add an OUTPUT stream rule for open port 22 After adding the above two rules, you don't have to worry about logging on to SSH. To learn more about the command, use iptables -- help Here we will focus on the differences between dport and

1. disable all INPUTFORWARDOUTPUT to open only some ports. The following is the command implementation: iptables-PINPUTDROPiptables-PFORWARDDROPiptables-POUTPUTDROP and then use the command iptables-L-n to check whether the settings are correct. then, we can see that all the settings have been dropped, 1. disable all input forward output and only open it to some ports. The following is a command implementation: Iptables-P INPUT DROPIptables-P FORWARD DROPIptables-P OUTPUT DROP Run the command ip

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Linux iptable firewall block and open ports Source: http://hi.baidu.com/zplllm/item/f910cb26b621db57c38d5983 Evaluation: 1, close all the INPUT FORWARD OUTPUT only to some ports open. Here is the command implementation: Iptables-p INPUT DROP Iptables-p FORWARD DROP Iptables-p OUTPUT DROP Then use the command iptables-l-N to see if it's set up and look good to all DROP This setting is OK, we are only temporary, restart the server or will restore the original did not set the state You will

Tags: nbsp Author Invalid Other ash view Dex simple can't1. Close all INPUT FORWARD OUTPUT only for certain ports.Here is the command implementation:Iptables-p INPUT dropiptables-p FORWARD dropiptables-p OUTPUT DROPRe-use the commandIptables-l-NCheck to see if it's all set up.Such a setup, we are only temporary, restart the server or will restore the original not set the stateand save with service Iptables saveService Iptables SaveSee information firewall rules Firewall rule is actually saved in

[Root @ localhost ~] # Catetcaccess #! Binbash # clear policy sudoetcinit. diptablesstop # Open Server Port sudosbiniptables-IINPUT-ptcp -- dport22-jACCEPTsudosbiniptables-IOUTPUT-ptcp -- sport22-jACCEPTsudosbiniptables [Root @ localhost ~] # Cat/etc/access #! /Bin/bash # Clear sudo/etc/init. d/iptables stop # Open Server Port sudo/sbin/iptables-I input-p tcp -- dport 22-j ACCEPT sudo/sbin/iptables-I OUTPUT-p tcp -- sport 22- j ACCEPT sudo/sbin/iptabl

Iptables-Fiptables-Xiptables-F-tmangleiptables-tmangle-Xiptables-F-tnatiptables-tnat-X first, clear the three tables and the self-built rules. Iptables-PINPUTDROPiptables-POUTPUTDROPiptables-PFORWAR Iptables-FIptables-XIptables-F-t mangleIptables-t mangle-XIptables-F-t natIptables-t nat-XFirst, empty the three tables and empty the self-built rules. Iptables-P INPUT DROPIptables-P OUTPUT DROPIptables-P FORWARD ACCEPTSet the default policy of INPUT and OUTPUT to DROP and FORWARD to ACCEPT. Iptable

output-o eth +-p icmp -- icmp-type 0-j ACCEPTEnable the ping function on all NICs for easy maintenance and detection.Iptables-a input-I eth0-s 192.168.100.250-d 192.168.100.1-ptcp -- dport 22-j ACCEPTIptables-a output-o eth0-d 192.168.100.250-s 192.168.100.1-ptcp -- sport 22-j ACCEPTOpen port 22 to allow remote management. (Many additional conditions are set: the IP address of the management machine must be 250 and must be entered from the eth0 NIC)

1. disable all INPUTFORWARDOUTPUT to open only some ports. The following is the command implementation: iptables-PINPUTDROPiptables-PFORWARDDROPiptables-POUTPUTDROP and then use the command iptables-L-n to check whether the settings are correct. you can see that all the settings have been dropped. 1. disable all input forward output and only open it to some ports.The following is a command implementation: Iptables-P INPUT DROPIptables-P FORWARD DROPIptables-P OUTPUT DROP Run the command iptables

1. Disable all input forward output and only open it to some ports.The following is a command implementation: Iptables-P INPUT DROPIptables-P FORWARD DROPIptables-P OUTPUT DROP Run the command iptables-L-n to check whether the settings are correct.After the settings are completed, we only need to temporarily restart the server to restore the previously unconfigured status.You must also use service iptables save to saveThe firewall rules are saved in/etc/sysconfig/iptables.You can open the file t

# time netstat-ant | grep EST | wc-l3100real 0m12. 960 suser 0m0. 334 ssys 0m12. 561 s # time ss-o state established | wc-l3204real 0m0. 030 suser 0m0. 005 ssys 0m0. 026 s The result is obvious that the efficiency of the number of concurrent connections in ss statistics has been defeated by netstat. If the ss can handle this problem, will you still choose netstat? Are you still hesitating? refer to the following example, or go to the Help Page. Common ss commands:Ss-l show all locally opened p

0m12. 561 s # time ss-o state established | wc-l3204 real 0m0. 030 suser 0m0. 005 ssys 0m0. 026 s netstat # time netstat-ant | grep EST | wc-l3100 real 0m12. 960 suser 0m0. 334 ssys 0m12. 561 s # time ss-o state established | wc-l3204 Real 0m0. 030 suser 0m0. 005 ssys 0m0. the 026s result is obvious. The efficiency of the number of concurrent connections in the ss is defeated by netstat. If the ss can handle this problem, will you still choose netstat? Are you still hesitating? refer to the fol

# Delete existing rules in iptablesIptables-FIptables-x # Discard all data packets that do not comply with the three chain rulesIptables-P input dropIptables-P output dropIptables-P forward drop Iptables-A input-I lo-J acceptIptables-A output-O lo-J accept Iptables-A input-I eth0-M state -- State established, related-J accept Iptables-A input-p udp-I eth0 -- Sport 53 -- dport 1024: 65535-J acceptIptables-A output-p udp-O eth0 -- dport 53 --