ISP change



  • One of the offices I work for has changed to a new ISP. I am trying to reconfigure the WAN interface for the new static IP address but the internet connection will only last a minute or so before it is gone. If I revert back to the old ISP it works without any problems.  If I plug the new ISP's line into my laptop and configure with the static IP the connection stays and I have no problem with internet.

    I have talked to the ISP's tech support and there seems to be no issues on their end and are unable to help trouble shoot.

    What could be causing the internet connection to work without issue for a minute or two then be dropped?

    Thank you for your help and suggestions in advanced.



  • You say the connection lasts a minute or so before it's "gone". How is it gone? Does the address revert back to the old one on your WAN NIC? Does the address stay the same but just loses connection to the upstream router? If you try pinging the new ISP's router from the command-prompt on the pfSense does it reply? Or are you simply losing the connection from within your LAN? If that's the case (the last scenario), check your rules to be sure they don't have any static IP information relating to your old ISP.

    How about posting some screen shots of your WAN settings and your firewall rules/NAT rules?



  • The WAN interface retains all the information for the new ISP but after only a few minutes the connection to the internet is gone. I have not tried pinging from the pfSense terminal but have ran tracert from a machine behind the firewall and packet dies at firewall.

    There are no NAT rules set other than a port forwarding for our VoIP system.

    ![WAN Rules.PNG](/public/imported_attachments/1/WAN Rules.PNG)
    ![WAN Rules.PNG_thumb](/public/imported_attachments/1/WAN Rules.PNG_thumb)
    ![NAT Outbound.PNG](/public/imported_attachments/1/NAT Outbound.PNG)
    ![NAT Outbound.PNG_thumb](/public/imported_attachments/1/NAT Outbound.PNG_thumb)
    ![WAN settings.PNG](/public/imported_attachments/1/WAN settings.PNG)
    ![WAN settings.PNG_thumb](/public/imported_attachments/1/WAN settings.PNG_thumb)



  • @RoboZIG:

    The WAN interface retains all the information for the new ISP but after only a few minutes the connection to the internet is gone.

    How do you know it's gone? Do you run a continuous ping from a host within the LAN or a continuous ping from the perimeter until the connection stops?

    I have not tried pinging from the pfSense terminal but have ran tracert from a machine behind the firewall and packet dies at firewall.

    So why not try pinging from a terminal session on the pfSense to see if the connection is still present between your firewall and the upstream router? Have you tried flushing the states table on the firewall when this happens? Better still, do you flush the states table when you change over the WAN connection?

    A screen shot of your LAN rules might help also.