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Questions tagged [iptables]

Iptables is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel.

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10 votes
8 answers
80k views

How can I fix the iptables error message "unable to initialize table 'filter'"?

When I try to use iptables command on one of my Rackspace cloud server, I'm getting the following error. In an attempt to apply iptables rules with iptables-apply -t 120 /etc/iptables.rules and ...
user3215's user avatar
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4 votes
2 answers
8k views

What are fail2ban's log iptables "returned NNN" entries? (Fail2ban is failing to ban)

In my fail2ban.log there are some entries the meaning of which I don't understand (and haven't found searching around)... I have several "jails", and I have created one particular one that bans IP's ...
luri's user avatar
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15 votes
4 answers
62k views

How can I block ping requests with IPTables?

and stealth specific ports?
david25's user avatar
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42 votes
6 answers
465k views

Reloading iptables

I made changes to iptables config file in /etc/iptables/filter in Ubuntu and want to reload them. I read the man page and also googled but couldn't find the information. Any help will be appreciated.
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5 votes
2 answers
5k views

iptables rule to force all browsers to use proxy

I have installed squid as my proxy server in Ubuntu 10.04 standalone system which has a single NIC. Why i have installed Squid in a standalone system is because of my friends who uses my system to ...
karthick87's user avatar
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2 votes
1 answer
3k views

Weird issue with iptables redirection

I am trying to redirect all incoming traffic on UDP port 5060 to port 56790, and all outgoing traffic from 5060 to the port 56789. I used these iptables rules: iptables -t nat -I PREROUTING -p udp ! -...
skypemesm's user avatar
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1 vote
3 answers
7k views

iptables allow dyndns domain name and auto update rules

I have registered with dyndns domain for my dynamically changing public ip address to use with iptable rules. On a server I've allowed some ports for this domain in the iptables configuration like the ...
user3215's user avatar
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1 vote
2 answers
2k views

iptables & nmap on ubuntu

The following are my iptable rules on a ubuntu cloud server: cat /etc/iptables.rules: *filter :INPUT DROP [598:41912] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [456:35354] -A INPUT -i lo -j ...
user3215's user avatar
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38 votes
7 answers
100k views

GUI for iptables?

I would like to secure my server and it seems that IPtables is one of the first steps. Unfortunately editing the rules in a terminal is a bit complicated and dangerous (those who ever did an iptables -...
silvo's user avatar
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