{"id":154,"date":"2011-11-24T20:07:00","date_gmt":"2011-11-24T20:07:00","guid":{"rendered":"http:\/\/pheonixsolutions.com\/?p=154"},"modified":"2011-11-24T20:07:00","modified_gmt":"2011-11-24T20:07:00","slug":"steps-to-check-the-opened-ports-in-ip-tables","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/steps-to-check-the-opened-ports-in-ip-tables\/","title":{"rendered":"Steps to check the opened ports in IP tables"},"content":{"rendered":"
To view the ports that are already opened in the server, execute the following command.<\/span><\/p>\n

netstat -plan |grep LISTEN<\/p>\n

Steps to open a new port in IP tables<\/span><\/p>\n

Before opening a port, you should be aware of why are you opening the port and what is the port being used for. <\/p>\n

Save the existing IP tables.<\/span><\/p>\n

root@server [~]# \/etc\/init.d\/iptables save
Saving firewall rules to \/etc\/sysconfig\/iptables: [ OK ]<\/p>\n

To open a port, execute the commands below.<\/span><\/p>\n

iptables -A allowed -p tcp –dport portno -s IPaddress -j ACCEPT
iptables -A allowed -p udp –dport portno -s IPaddress -j ACCEPT<\/p>\n

To allow all IP address,<\/span><\/p>\n

iptables -A INPUT -i eth0 -p tcp -m tcp –dport portno -j ACCEPT<\/p>\n

Check whether the Port is allowed.<\/span><\/p>\n

root@server [~]# iptables -nL | grep :3306
ACCEPT tcp — 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:3306
ACCEPT tcp — 0.0.0.0\/0 0.0.0.0\/0 tcp dpt:3306<\/div>\n","protected":false},"excerpt":{"rendered":"

To view the ports that are already opened in the server, execute the following command. netstat -plan |grep LISTEN Steps to open a new port in IP tables Before opening a port, you should be aware of why are you opening the port and what is the port being used… Continue Reading Steps to check the opened ports in IP tables<\/span><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-154","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"h-entry","9":"h-as-article"},"yoast_head":"\nPheonix Solutions - 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