January 9, 2009 04:39am pst

10.24.2008 at 03:31AM PDT, ID: 23844054

	[x] Attachment Details

[x]

The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

The Grade of the Solution
The Zone Rank of the Expert Providing the Solution
The Number of Author and Expert Comments
The Number of Experts Contributing
The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

8.9

How to Block Port 25 on entire LAN except my Mail-Server using IPCop v 1.4.21

Asked by LyntonJennings in Linux Network Security, Network Software Firewalls, Network Management

Tags: Linux, IPCop, IPCop, 1.4.21, IPCop, 1.4.21, Block port 25

Hi,

I have IPCop v1.4.21 and I am trying to block all port 25 traffic on my green interface except for my Mail-Servers IP Address. I have looked up a few site on the web so far and I have added the following into my
vi /etc/rc.d/rc.firewall.local file

## add your 'start' rules here
# allow smtp from some allowed ips
/sbin/iptables -A CUSTOMFORWARD -p tcp -i eth0 -s x.x.x.x --dport 25 -j ACCEPT
/sbin/iptables -A CUSTOMFORWARD -p tcp -i eth0 -s x.x.x.x --dport 465 -j ACCEPT
# log stuff that is not the mail server
/sbin/iptables -A CUSTOMFORWARD -p tcp -i eth0 -s ! y.y.y.y --dport 25 -j LOG --log-prefix "SMTP"
/sbin/iptables -A CUSTOMFORWARD -p tcp -i eth0 -s ! y.y.y.y --dport 465 -j LOG --log-prefix "SMTP-SSL"
# block all other outgoing SMTP traffic
/sbin/iptables -A CUSTOMFORWARD -p tcp -i eth0 -s ! y.y.y.y --dport 25 -j REJECT
/sbin/iptables -A CUSTOMFORWARD -p tcp -i eth0 -s ! y.y.y.y --dport 465 -j REJECT

x.x.x.x being the IP address I would like to ALLOW access and y.y.y.y being my MAIL-SERVER....

This however doesn't seem to be working...
Can anyone help me? What should I do next? How do I ensure that these changes I have made to this file are actually initiating on boot?

Thank in advacne
Start Free Trial

Keywords: How to Block Port 25 on entire LAN e…

	Title
1	Iptables and FTP upload
2	IPTables, DNAT, SSH forwarding - …
3	iptables
4	iptables ftpd
5	Simple iptables ruleset with port 80 fo…
6	IPTABLES not allowing Remote Desktop…

Loading Advertisement...

20080716-EE-VQP-32 - Hierarchy / EE_QW_2_20070628

There are currently no qualifying experts in Linux Network Security

1. ahoffmann 190,776
2. ravenpl 109,775
3. jlevie 95,810
4. Redimido 66,348
5. kblack05 65,801
6. noci 47,238
7. shakoush... 46,687
8. Blaz 42,005
9. Nopius 33,250
10. omarfarid 32,679
11. xDamox 32,605
12. wesly_c... 31,085
13. decoleur 28,923
14. XoF 28,530
15. Tintin 25,155
16. slyong 21,932
17. pjedmond 21,733
18. Mysidia 20,470
19. chris_cal... 19,816
20. ppfoong 15,532
21. grblades 15,472
22. fosiul01 15,461
23. KeremE 12,500
24. rindi 12,200
25. mbarbos 11,763

How to Block Port 25 on entire LAN except my Mail-Server using IPCop v 1.4.21

Asked by LyntonJennings in Linux Network Security, Network Software Firewalls, Network Management

Tags: Linux, IPCop, IPCop, 1.4.21, IPCop, 1.4.21, Block port 25

About this solution