Sonicwall Tz190 overlap subnet on WAN interface

Posted on 2009-02-09
Last Modified: 2013-11-16
I have problems with my Sonicwall Tz190W for over 2 weeks that drive me nuts.
I have for over one year two External IP from my ISP provider and it work fine until last week.
The reason I have two IP is that one is for the WAN interface that redirect port 80 to my IIS server and port 25 to my Exchange server. The second IP on the OPT interface redirect port 80
another IIS server that run a Kaseya server. I did need a third IP for my VOIP ata so I order an extra one from my ISP and get it to work for a week fine. After a week the IP has change for the first time in over 6 months and at the same time I did a firmaware upgrade on my sonicwall. Since then I can't get both IP at the same time on both interface. I get only one at the time or if I get the second one then it keep coming and go ever second. On the logs I see the following message: Network for interface OPT overlaps with another interface.
Now if i try to enter teh IP manually I get an error about the Subnet on this interface overlaps with another interface.
I spend almost a week on the phone adn onsite with my ISP provider and they can't figure it out.
I have the filling that has something to do with the ISP but the firmaware upgrade could also have something to do. The reason it drive me crazy is that I try to eliminate the sonicwall firmware by loading 3 diferent firmware version with same results and I also eliminate the ISP by attaching 3 diferent computers adn geting 3 diferent stable IP.
What else I should look at.
Question by:Infedo

    Accepted Solution

    The IP and gateway was on the same range.
    I clone a diferent MAC adress adn obtain a diferent IP and it work now

    Expert Comment

    I have the same problem. My ISP gave me 5 IP in the same range and subnet. I don't know how use all in the same sonicwall
    LVL 2

    Expert Comment

    I don't think you can't use more than 2 if you have the TZ 190. One goes on the WAN and one goes on the OPT. If you have 2 on the same range then grab a diferent mac from another router or change a little the number on the original one until it grab somthing on a diferent range. I use 3 by adding 2 to the sonicwall and one to a second router on the same subnet as the sonicwall

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    How to improve team productivity

    Quip adds documents, spreadsheets, and tasklists to your Slack experience
    - Elevate ideas to Quip docs
    - Share Quip docs in Slack
    - Get notified of changes to your docs
    - Available on iOS/Android/Desktop/Web
    - Online/Offline

    I have seen some questions on problems with SSH/telnet access to Cisco routers that may occur despite the fact that from a PC connected to your LAN, Internet connectivity is in place and users can access Internet sites without any issues.  There are…
    Hello , This is a short article on how would you go about enabling traceoptions on a Juniper router . Traceoptions are similar to Cisco debug commands but these traceoptions are implemented in Juniper networks router . The following demonstr…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

    760 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    9 Experts available now in Live!

    Get 1:1 Help Now