Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

WAN to LAN any to any is set to Deny

Posted on 2011-09-30
4
Medium Priority
?
808 Views
Last Modified: 2012-06-27
Hello,
I have some difficulty understanding how internet and other services are working when I have
WAN to LAN (any to any) policy on my TZ100 firewall set to Deny. LAN to WAN is set to Allow any to any.
Scan of an external IP address reveals no open ports; however everything seems to be working.

thanks
0
Comment
Question by:Andrei9
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 37

Expert Comment

by:Neil Russell
ID: 36892606
Internet is not a WAN to LAN communication.
to deny internet access you would need to block port 80 outbound
0
 

Author Comment

by:Andrei9
ID: 36892932
thanks Neilsr.

but how does communication take place if nothing is open on WAN? How do packets enter LAN from WAN?
0
 
LVL 37

Accepted Solution

by:
Neil Russell earned 2000 total points
ID: 36893818
When you open an outgoing IP connection to a given address your firewall remembers who your talking to and expects replies on a given port and accepts them.

IF somebody tries to initiate a connection to you without that initial outgoing connection then THAT is where your WAN to LAN block comes into effect.

If you think about it, how else would you be able to go out on port 80 and talk to EVERY different website on the planet?
0
 

Author Closing Comment

by:Andrei9
ID: 36893843
very good!
thanks
0

Featured Post

Q2 2017 - Latest Malware & Internet Attacks

WatchGuard’s Threat Lab is a group of dedicated threat researchers committed to helping you stay ahead of the bad guys by providing in-depth analysis of the top security threats to your network.  Check out our latest Quarterly Internet Security Report!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Managing 24/7 IT Operations is a hands-on job and indeed a difficult one. Over the years I have found some simple tips and techniques to increase the efficiency of the overall operations. The core concept has always been on continuous improvement; a…
Quality of Service (QoS) options are nearly endless when it comes to networks today. This article is merely one example of how it can be handled in a hub-n-spoke design using a 3-tier configuration.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Suggested Courses

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question