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Redesign Network - 2.Jul.2008 7:15:19 AM

guru_sanjay

Posts: 21
Joined: 7.Aug.2007
Status: offline

Hi,

I am serving as a system admin for an organization. We have ISA 2004 network, with Exchange 2003 Standard edition server, 2 Microsoft SQL server 2005 Standard edition for database projects, Windows 2003 domain controller in two sites A and B using active directory services. These two sites are VPN tunneled between ISA 2004 Enterprise Edition and SonicWall Tz170. We at Site A have 2 MBPS 1:1 T1 internet connection in our site. Sometime back, we had applied for one more internet connection of speed 2 MBPS 1:4 Broadband from some other provider. After much research , we had opted and ordered for PEPLINK 300 router to support load balancing and failover of internet between Cisco 1700 series Router, Peplink 300 Router and ISA 2004 enterprise edition server with two NIC cards of which one is configured externally and the other internally. But to our dismay, after introducing Peplink 300 router, internet became slow at times and many users started complaining about slow speeds. So I disconnected the other internet line keeping aside PEPLINK router 300. Our mail system is configured in such a way that it happens through VPN connection between our two sites.

As a system admin, I have given the task of residning the entire network of whatever be the upgradations. Our main task is to have
1.) Good Internet speeds from more than one providers to have load balancing and failover capabilities so that our network is always hokked to net.
2.) Good VPN speeds between two locations.
3.) Good Email System and Communication.
4.) Site to site interconnectivity to access the Remote systems through RDP, FTP etc.,

I just know about the requirement to redesign using the above parameters.

Can you please guide me?

Regards
Sanjay

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RE: Redesign Network - 2.Jul.2008 11:27:10 AM

pwindell

Posts: 782
Joined: 12.Apr.2004
From: Taylorville, IL
Status: offline

I am approaching this from the perspective that you want dependability and performance and not as someone who "wants something for nothing" or someone who wants something at "home-user" costs.

1.) Good Internet speeds from more than one providers to have load balancing and failover capabilities so that our network is always hokked to net.

2 ISPs,...is a mistake. It should be from the same provider using Commercial Grade connections (not "home user" lines like DSL or CableTV). The load balancing is done by running both lines into the same Router. The ISP configures the Dynamic Routing Protocols (I believe IGRP) on the Router to work "hand-in-hand" with the same setup on thier router at the other end of the lines. The whole thing is maintained and managed by the ISP (hence you need the same ISP for all the lines)

2.) Good VPN speeds between two locations.

VPN by nature is slow,..always will be,...you almost just cannot ever throw enough bandwidth at it. It has a very high Protocol Overhead, is somewhat unstabile, and on Asyncronous lines (ADSL, CableTV) will always "lock in" at the slower upload speed of the lines,..so the Upload speed is the important one to look at. Using Private Leased Lines, even at a slower speed, is usually faster and more stabile because they run cleaner with less overhead...but obviously costs $$$. You always "get what you pay for", never forget that.

3.) Good Email System and Communication.
4.) Site to site interconnectivity to access the Remote systems through RDP, FTP etc.,

Both #3 and #4 simply depend on the quality of #2.

_____________________________

Phillip Windell
www.wandtv.com

(in reply to guru_sanjay)

Post #: 2