Connecting multiple offices

Posted on 2009-06-30
Medium Priority
Last Modified: 2013-12-14
I have four offices spread over the state with different ISP's.  I need to get them on the same network so they can all share files from a server in one location.  I have fairly extensive LAN knowledge but WAN knowledge is very minimal.  What do I need to get these connect with the least amount of cost/setup yet something reliable?  The offices are all connected a little bit differently.  Three have standard cable/dsl setups but one of them is piggybacking off of a T1 that is in the office complex I believe.  Thanks for your assistance.  
Question by:Kerberos24
LVL 19

Assisted Solution

by:Rob Hutchinson
Rob Hutchinson earned 400 total points
ID: 24750418
I can give you some general info that might be of some help, or not.

You have four seperate networks in each of the four offices since these offices do not share a common network( which is what you want) you need to create a common network to connect all four offices.

What will happen here, is you will pick one location( where the server is possibly) as the location where the other remote locations will VPN into. The VPN connection among the four locations will likely be connected all the time and require someone with VPN's/routing to configure it all.

To make life easier, you might want to look for a company with remote server hosting which, at the same time, gives remote server login ability that can be setup. This way it's easier as all four locations would connect to the remote server without having to setup any special routing config among the our netorks and use their existing connection.

Deciding on which option is best depends on the budget, the number of users involved, as well as the applications being shared.

Accepted Solution

evan021702 earned 600 total points
ID: 24750422
You need make one of the sites the main site, preferrably one that hosts all the servers. Next:
1. Make sure all ISP connections use a static IP address. If not order/switch to one you cannot configure VPN without this.
2. Purchase a VPN concentrator for the main office.
3. Purchase VPN appliances for the remote offices.
I have only used Cisco VPN concentrators.  Your best best would be to get a PIX501e for the main office and a some 3Coms for the other offices:
Not sure if 3Com makes a new version of these, but they are easy to setup and maintain:
From there you will need to research how to configure IPSEC VPN tunnels, preferrably using AES encryption with MD5 hash algorithm.  

Author Closing Comment

ID: 31598566
Thank you very much.  Going to research VPN concentrators.  

Expert Comment

ID: 24753674
You may also look into Cisco's DMVPN feature in IOS 12.4

It is the closest to a perfect solution as you can get.  In your situation where you're dealing with dynamic IP addresses on the branch offices, DMVPN will not require you to incur additional cost of getting Static IPs at your branches.
Also, if you already have existing Cisco routers at both your main site and branch offices, you can leverage that hardware (assuming they can support 12.4)
here is a link to this feature:


I hope this helps.

Featured Post

WEBINAR: GDPR Implemented - Tips & Lessons Learned

Join the WatchGuard team on Thursday, March 29th as we recount some valuable lessons learned in weighing the needs of a business against the new regulatory environment, look ahead at the two months left before implementation, and help you understand the steps you can take today!

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Unable to change the program that handles the scan event from a network attached Canon/Brother printer/scanner. This means you'll always have to choose which program handles this action, e.g. ControlCenter4 (in the case of a Brother).
In this article, the configuration steps in Zabbix to monitor devices via SNMP will be discussed with some real examples on Cisco Router/Switch, Catalyst Switch, NAS Synology device.
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
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…

619 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