Avatar of MattBamm
MattBamm
Flag for United States of America asked on

Sonicwall NSA Duel WAN

Hello,

I have a Sonicwall NSA 2400 with duel Wan capabilities.

My issue is that the IP from my ISP are in the same subnet range and the firewall keeps giving me: Subnet on this interface overlaps with another interface

Interface Setting x1 - 67.43.206.19 Subnet: 255.255.255.0
Interface Setting x2 - 67.43.206.201 Subnet 255.255.255.0


I called my ISP and they cannot give me any other IP in a diffrent subnet range.

Is there any other way I could fix this, or a way around it?

I started this other question that is refuring to the same question I have.
https://www.experts-exchange.com/questions/25147914/Network-design-help.html?anchorAnswerId=26603235#a26603235

Thanks,
Matt
NetworkingNetworking Hardware-OtherHardware Firewalls

Avatar of undefined
Last Comment
MattBamm

8/22/2022 - Mon
Ugo Mena

looks like the subnet mask is wrong.... is that what the ISP gave you?
MattBamm

ASKER
yes. and it's what DHCP's when i hook up a computer.
theonlyallan

This is a limitation of the Sonicwall..
You can not have 2 ISP connection with the same Gateway. It causes errors. .The sonicwall has a routing table and will not know which interface to route your traffic..

The best practice: you are supposed to have Two ISP connections from Two different company. Because in your scinearo, if your ISP goes down, most likely both will go down at the same time.
You should have mixed technologies like: 1-ADSL, 2-Cable Modem.. etc..

If you really want it setup that way, see if your ISP can assign you a Static IP.  Have connection#1 Static IP, Connection#2 DHCP.. Most likely they will be on separate subnet and it will work fine.
Experts Exchange is like having an extremely knowledgeable team sitting and waiting for your call. Couldn't do my job half as well as I do without it!
James Murphy
ASKER CERTIFIED SOLUTION
theonlyallan

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
GET A PERSONALIZED SOLUTION
Ask your own question & get feedback from real experts
Find out why thousands trust the EE community with their toughest problems.
MattBamm

ASKER
Thanks, Worked!