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Sonicwall WAN loadbalancing issues?

Hi Experts,

I have a Sonicwall 2040 configured with WAN failover. I have 2 ISP for 2 internet connections.

ISP1: 206.45.x.24/29 ---> X1 interface.
ISP2: 73.12.x.52/29 ---> X2 interface.

On local network (X0 interface), I also have exchange and web server which go to the public internet. The rules are being set for X1 interface. What do I have to do to make sure when it failover to X2 interface, all the exchange and web servers still can visible to the public?

Thanks.

cgaeden

I believe that you'll need to have external DNS for your mail and web servers setup on the Internet with a low TTL (time to live) for each of their entries. If or when your primary ISP fails, you'll need to have entries setup on your Sonicwall using your alternate ISP's IP addresses that point to your internal servers. Should a failover occur, you would then update the DNS entries for those servers with the alternate ISPs IPs and after the TTL expires traffic will flow to the alternate addresses for those servers.

You could potentially update the IP addresses dynamically using a service like dyndns.org or dnsmadeeasy.com and running a Dynamic DNS client on your servers.

Are you using NAT to pass traffic through to your servers now?

SJCA

ASKER

Yes, I'm using NAT to pass traffic.

SJCA

ASKER

IS there anyway that I don't have to update my dns entries? I just want the email and web server keep working without having any issue after the failover second ISP.

ASKER CERTIFIED SOLUTION

cgaeden

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