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IPTables Firewall – Full Tutorial

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linux-howto

http://lpilinux.com – iptables is a firewall that is a replacement of the IPChains firewall for the Linux 2.4 kernel and later versions. It requires elevated privileges to operate, and it must be executed by user root, otherwise it fails to function. iptables allows a system administrator to configure the tables provided by Xtables (which in turn uses Netfilter) and the chains and rules it stores. iptables has the following features: * It supports stateful packet inspections. * I (HowTos)

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Submitted by dayu on 04/04/2010 – Made popular on 04/04/2010

Stories similar to IPTables Firewall – Full Tutorial

iptables fails on COMMIT 39 weeks 1 day ago

I noticed this morning the iptables firewall was not starting due to the fact that I rebuilt the kernel and forgot to include the relevent Netfilter modules. So I added those and rebooted. The firewall still fails, but rather that referring to the non-available ip_tables module, it now just says iptables.init[1290]: iptables: Applying firewall rules: iptables-restore: line 13 failed.

this firewall blocks input chain? 17 weeks 21 hours ago

I used an online tool to create an iptables firewall. Basically I just need port 22 and 1194 open to the outside world. But I noticed this bash script has input, forward and output chains as accept by default. Is it blocking all traffic but those two ports? Thanks.

Possible Duplicate: iptables: forward port 80 to port 8080

I'd like to forward port 80 to 8080. So I tried to edit /etc/syscongfig/iptables:

-A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080

But got:

# service iptables restart iptables: Flushing firewall rules: [ OK ] iptables: Setting chains to policy ACCEPT: filter [ OK

Importing iptables Configurations Into Firewall Builder

Firewall Builder is a firewall configuration and management GUI that supports configuring a wide range of firewalls from a single application. Supported firewalls include Linux iptables, BSD pf, Cisco ASA/PIX, Cisco router access lists and many more.

Hi could could anyone help me understand why line 15 is failing supposedly in my iptables file.

iptables question. 34 weeks 1 day ago

I'm currently trying to get a little better understanding of iptables, and I am reading through the wiki page for Simple Stateful Firewall athttps://wiki.archlinux.org/index.php/Si … l_firewall , which is full of great examples.On this wiki, they create two user-defined chains, TCP, and UDP:iptables -N TCP iptables -N UDPIt appears that they send new incoming tcp or udp traffic to these user-

Had a strange issue this morning.

cfr wrote:Why are you trying to start iptables.service if you don't want iptables to filter anything?

iptables not starting up 39 weeks 16 hours ago

I have inherited a custom built Linux kernel 2.6.30.9 and am just upgrading the underlying OS from RHEL 5.4 to 5.8 (kernels 2.6.18.164 and 2.6.18.308 respectively).

When booting, the following is displayed:

unloading iptables modules [ OK ] Applying iptables firewall rules: modprobe: FATAL: module ip-tables not found.

iptables-restore v1.3.5: iptables-restore unable to init