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Posted on 2011-09-02
Last Modified: 2012-05-12

Our enterprhise Network consists of a Single SNAP Gear firewall acting as a Router and a modem is used in a bridge mode to this Firewall.

The ADSL 1 Connection what we currently have is not enough and the service providers coudlnt get us ADSL 2 + or any cable Broad Band sche is our locality.

So we have decided to go for an additional ADSL 1 Connection from the same ISP and we have to find out a solutions to AGGEREGATE the two WAN connection in to one High bandwidth Link or LOad Balancing between two ADSL Connections.

Currently we have planned to buy another Firewall/Modem/Router for the new ADSL 1 Connection. Also I've already have a Cisco 3750 Layer 3 Switch inside our network .

So my quiestion is

1) How do I AGGREGATE or LOAD BALANCE between these two ADSL Routers.
2) Can I enable EIGRP in my layer three switch and Confire two physical interfaces with 2 different segments and another physical interface for internal LAN ; subsequbelty use EIGRP to LOAD balance between two Physical Networks connected to the ADSL ROuters.

Also if you have any other solutions please advice, becuase we certainly need these two ADSL Connections to be used equally.

Question by:nirmal_s19
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LVL 45

Expert Comment

by:Craig Beck
ID: 36472949

Author Comment

ID: 36473299
Yes Ive gone through it earlier but I coudnt implement this because , i dont have a CISCO Router with IOS Based Firewall / VPN.

Moreover , we want to use the existing Firewall to do handle VPN connection.
LVL 45

Expert Comment

by:Craig Beck
ID: 36473400
Apologies, I saw EIGRP and instantly thought PfR.

I would use a Dual-WAN router to load-balance the links...

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Author Comment

ID: 36474513
Do you know the COst for this GW7000 Box?

Is'int a way to use my current layer 3 switch to equally distribute the load over two adsl routers?
LVL 37

Expert Comment

ID: 36477453
EIGRP won't help you do load balancing over two different internet connections

If both Internet connections are with the same ISP, and you have a routable block of addresses which can be accessed over either connection, then you can do  outbound per packet load balancing http://www.aaisp.net/kb-broadband-bonding.html

If the internet connections are with different ISPs then you can only do per session/stream outbound load balancing. There are many commercial offerings to do this as well as a few open source options such as pfSense http://www.pfsense.org/ 

Accepted Solution

nirmal_s19 earned 0 total points
ID: 36484509
I found a better solution to use in my infrastusture using my cisco 3750 switch. Its POLICY BASED ROUTING
LVL 37

Expert Comment

ID: 36493963
PBR is closer to load splitting rather than load balancing, but if it works for you :-)
LVL 35

Expert Comment

by:Ernie Beek
ID: 37052340
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.

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