Solved

Can't access seperate company LAN from our DMZ

Posted on 2007-03-21
2
206 Views
Last Modified: 2013-11-16
Hi All,

I have a puzzling problem, we have:

A DMZ (10.1.8.1)
A Public Internal network (10.1.10.1)
A Private Internal network (10.1.9.1)
A sister site's network (10.1.4.1) This network is at the other end of a 100Mb LES Link

At either side of the LES link is an Avaya Layer 3 switch, (10.1.10.254) on the public internal network and (10.1.4.1) at the sister site's network.

In between the two layer 3 switches on the LES link we have a 10.1.5.1 network

Now, I have opened up rules on the FW to allow data to pass between 10.1.8.5 & 10.1.4.20

I can ping 10.1.8.5 from 10.1.4.20 and see the following tracert:

Hop 1 : 10.1.4.1 (default gateway - on Layer 3 switch at sister site)
Hop 2 : 10.1.5.2 (our side of the internal LES 100 link - on Layer 3 switch at our site)
Hop 3: 10.1.10.1 (internal public firewall interface at our site)
Hop 4 : 10.1.8.5 (destination machine on DMZ)

However, when I try to send a tracert the other way, I get

Hop 1 : 10.1.8.1 (DMZ firewall interface)
Hop 2 : 10.1.10.254 (our side of the Layer 3 switch at our site)
Hop 3 : *     *    *  Request Timed out

It IS POSSIBLE to contact the 10.1.4.0/24 site from the 10.1.9.0/24 & 10.1.10.0/24 networks, just not from the 10.1.8.0/24 networks!

I'm at the end of my tether with this now, please can someone help me!

Thanks
Andy
0
Comment
Question by:A4eIT
[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 Comments
 
LVL 6

Accepted Solution

by:
Dooglave earned 500 total points
ID: 18768238
Do you see the ping or other traffic in your SmartView Tracker logs.  You should see encrypts going out and Decrypts coming in.

Run a TCP Dump and determine if you have ESP packets leaving your GW when you ping out.
How are they addressed, Do you have NAT enabled in any way?
0
 

Author Comment

by:A4eIT
ID: 18904196
Hi all, turns out to be a NAT problem
0

Featured Post

2017 Webroot Threat Report

MSPs: Get the facts you need to protect your clients.
The 2017 Webroot Threat Report provides a uniquely insightful global view into the analysis and discoveries made by the Webroot® Threat Intelligence Platform to provide insights on key trends and risks as seen by our users.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
replacing 2811 to ISR 4331 2 81
2960 not recognizing subinterface configuraton of 5510 11 70
Provide internet access from one windows PC to another 16 148
Routing Issue 26 69
Tired of waiting for your show or movie to load?  Are buffering issues a constant problem with your internet connection?  Check this article out to see if these simple adjustments are the solution for you.
Creating an OSPF network that automatically (dynamically) reroutes network traffic over other connections to prevent network downtime.
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…
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…

738 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