Iptables rules at boot


 
Thread Tools Search this Thread
Special Forums IP Networking Iptables rules at boot
# 1  
Old 01-06-2010
Iptables rules at boot

Hi

I have small home network and I want to block some forums on web
When I use this
Code:
iptables -A INPUT -s forum -j DROP

rules is applied but when I restart some of PC rules are not present any more also I tried to save firewall settings
Code:
iptables-save > /root/dsl.fw

but how to apply rules automated , maybe some kind of script

I am not experienced with network security so I ask here Smilie


OS : Ubuntu x64 with last kernel
# 2  
Old 01-06-2010
Ubuntu has ufw UFW (Uncomplicated firewall) For Ubuntu Hardy which is probably the easiest way to do what you want. If you want to work the way you are currently doing things, then just to an iptables-load in an init script to load back in your iptables-save file.
# 3  
Old 01-06-2010
Use an rc script, e.g. called ip_tables_setup:
Code:
#!/bin/bash

# chkconfig: 2345 01 99

PATH=/sbin:/bin:/usr/bin

case "$1" in
  start|"")

MyIF=wlan0
MyIP=`ifconfig ${MyIF} | grep  inet | grep -v 127.0.0.1 | grep -v inet6 | grep addr | \
     awk '{ print $2 }' | awk -F":" '{ print $2 }'`

#-----------------------
# load modules
#-----------------------
/sbin/depmod -a
/sbin/modprobe ip_conntrack
/sbin/modprobe ip_tables
/sbin/modprobe iptable_filter
/sbin/modprobe iptable_mangle
/sbin/modprobe iptable_nat
/sbin/modprobe ipt_LOG
#/sbin/modprobe ipt_REJECT
#/sbin/modprobe ipt_MASQUERADE
#/sbin/modprobe ip_conntrack_ftp 

#-----------------------
# flush all chains
#-----------------------
iptables -F INPUT 
iptables -F FORWARD 
iptables -F OUTPUT 
iptables -F -t nat

#----------------------
# Default policies
#----------------------
iptables -A INPUT -s forum -j DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT 
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
#iptables -A FORWARD -f -j ACCEPT

#---------------------------------
# All outgoing allowed
#---------------------------------
iptables -A OUTPUT -o $MyIF -s $MyIP -d 0/0 -j ACCEPT

#---------------------------------
# Established incoming allowed
#---------------------------------
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

#---------------------------------
# SSH incoming allowed
#---------------------------------
# iptables -A INPUT -i $MyIF -p tcp --syn -s 0/0 -d $MyIP --dport 22 -j ACCEPT
;;
  restart|reload|force-reload)
	echo "Error: argument '$1' not supported" >&2
	exit 3
	;;
  stop)
	# No-op
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT 
	;;
  status)
	iptables --list
	;;
  *)
	echo "Usage: $0h [start|status|stop]" >&2
	exit 3
	;;
esac

:

Change wlan0 to the name of your interface.

Then run:
Code:
# chkconfig --add ip_tables_setup

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. IP Networking

iptables - formatting icmp rules

Hi, I am relatively new to firewalls and netfilter. I have a Debian Stretch router box running dnsmasq, connected to a VPN. Occasionally dnsmasq polls all of the desired DNS servers to select the fastest. When it does this it responds to replies of the non-selected DNS servers with a icmp type... (0 Replies)
Discussion started by: CrazyDave
0 Replies

2. Cybersecurity

Need help for iptables rules

Hello, I did 2 scripts. The second one is, I hope, more secure. What do you think? Basic connection (no server, no router, no DHCP and the Ipv6 is disabled) #######script one #################### iptables -F iptables -X -t filter iptables -P INPUT DROP iptables -P FORWARD... (6 Replies)
Discussion started by: Thomas342
6 Replies

3. UNIX for Advanced & Expert Users

iptables help with rules

Hi, I've been struggling with this all morning and seem to have a blind spot on what the problem is. I'm trying to use iptables to block traffic on a little cluster of raspberry pi's but to allow ssh and ping traffic within it. The cluster has a firewall server with a wifi card connecting to... (4 Replies)
Discussion started by: steadyonabix
4 Replies

4. Shell Programming and Scripting

Need to Convert the QNX rules to UNIX iptables

Need to convert the QNX rules to Linux ubuntu 12.04. kindly any one help us with any tools (4 Replies)
Discussion started by: mageshkumar
4 Replies

5. UNIX for Advanced & Expert Users

Editing iptables rules with custom chain

Hello, I have iptables service running on my CentOS5 server. It has approx 50 rules right now. The problem I am facing now is as follows - I have to define a new chain in the filter table, say DOS_RULES & add all rules in this chain starting from index number 15 in the filter table. ... (1 Reply)
Discussion started by: BhushanPathak
1 Replies

6. Red Hat

iptables Rules for my network

Hi Champs i am new in Iptables and trying to write rules for my Samba server.I took some help from internet, created one script and run from rc.local : #Allow loopback iptables -I INPUT -i lo -j ACCEPT # Accept packets from Trusted network iptables -A INPUT -s my-network/subnet -j... (0 Replies)
Discussion started by: Vaibhav.T
0 Replies

7. Red Hat

Iptables/Firewall rules for multicast IP.

Hi Gurus, I need to add Multicast Port = xyz Multicast Address = 123.134.143 ( example) to my firewall rules. Can you please guide me with the lines I need to update my iptables files with. (0 Replies)
Discussion started by: rama krishna
0 Replies

8. Ubuntu

iptables rules (ubuntu)

Could someone help me with writing rules for iptables? I need a dos attacks protection for a game server. port type udp ports 27015:27030 interface: eth0 Accept all packets from all IPs Chek if IP sent more than 50 packets per second Drop all packets from this IP for 5 minutes I would be... (0 Replies)
Discussion started by: Greenice
0 Replies

9. Cybersecurity

Editing rules on iptables

Hello, I was playing around with iptables to setup an isolated system. On a SLES10 system, I ran the below to setup my first draft of rules. I noticed that the rules come into effect immediately and do not require any restart of iptables. iptables -A INPUT -j ACCEPT iptables -A OUTPUT -m... (4 Replies)
Discussion started by: garric
4 Replies

10. Shell Programming and Scripting

SED inserting iptables rules in while loop

I'm trying to insert multiple new lines of text into an iptables script using sed in a while loop. I'm not sure if this is the most effective way. Searching the forums has helped me come up with a good beginning but it's not 100%. I'd like it to search out a unique line in my current iptables file... (2 Replies)
Discussion started by: verbalicious
2 Replies
Login or Register to Ask a Question