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dual ISP / fault tolerance

By afram ·
Here is the problem:

We have two ISPs - one provides a T1 and the other is a backup DSL. We have a sonicwall firewall that takes two different ISPs and provides outbound fault tolerance. If the T1 goes down, we can browse the web over DSL. However, customers and remote offices can't see our website or send us email. Does anyone know of a device that will provide both outbound AND inbound fault tolerance for 2 different ISPs?

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BGP - TowerStream Unique Path

by 7000000 In reply to dual ISP / fault toleranc ...

BGP is the most obvious solution but requires some configuration and two carriers who are capable of providing the IP space and configuration assistance. Look at for more information on an excellent secondary unique path - they provide a business class Partial T1, I know it currently goes for $256 per month with a Class C available and BGP no additional charge.
Obviously hosting your website and mail OFFSITE with a reliable provider (maybe a company like for site space, and google apps for mail and other services) is the cheapest and easiest solution, especially for a smaller company.

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More than just a DNS

by clau In reply to dual ISP / fault toleranc ...

As some of the comments stated it is a routing issue to achieve what you try to accomplish. In fact, it is more than just a DNS routing. In general, you will also need configure (either hardware/software) to load balance/share the 2 connections and then DNS record to point to the two IP addresses.

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Dual DNS solution to redundant incoming problem

by maximtech In reply to dual ISP / fault toleranc ...

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