Ubuntu iptables Configuration

Ubuntu iptables Configuration:

1, Ubuntu default is installed Iptables, can be confirmed by dpkg-l or which iptables

2, Ubuntu default does not have iptables configuration file, need to be generated through Iptables-save >/etc/network/iptables.up.rules

3, iptables configuration file path and file name is recommended as/etc/network/iptables.up.rules, because execution iptables-apply by default point to the file, you can also specify the file through the-w parameter

3, Ubuntu does not restart Iptables command, the implementation of iptables-apply effective

4, Ubuntu iptables default restart server after emptying, need to write in/etc/network/interfaces pre-up Iptables-restore </etc/network/ Iptables.up.rules will not be active until the boot

Several iptables commands:

Allow all access to port 22:

# iptables-a input-p TCP--dport 22-j ACCEPT

Deny all access to port 22:

# iptables-a input-p TCP--dport 22-j DROP

Allow only 10.0.0.2 access to port 22:

# iptables-a input-p TCP--dport 22-s 10.0.0.2-j ACCEPT

Note: Allow policies to be written to the top of the reject, otherwise useless

To view the Iptables policy:

# iptables-l

Save the policy to the specified file (the following file path and filename can be customized):

# Iptables-save >/etc/network/iptables.up.rules

Apply policy:

# iptables-apply

Enter Y

Delete the policy (you need to cat/etc/network/iptables.up.rules confirm the deletion of the first few lines, or directly manipulate the/etc/network/iptables.up.rules file is also OK):

# iptables-d INPUT 2

This article is from the "Linux" blog, so be sure to keep this source http://yangzhiming.blog.51cto.com/4849999/1982814

Ubuntu iptables Configuration