Modem to Router to Pfsense Set Up

  • I have 2 Internet Connection from 1 ISP. I have read somewhere that using 2 internet connection for Multiwan from the same ISP will not work because they might acquire the same Gateway. The question is, How or what configuration should I do to the router to enable it to be plugged in one of my Pfsense ethernet ports and be detected as a gateway?

  • LAYER 8 Global Moderator

    You could just look and see if your IPs you get from your ISP on the 2 connections are in fact the same network and have the same gateway.  If they do not then your golden.

    If they do - you could always just nat one or both of them before connecting to pfsense.

  • tried it. they do get the same gateway. Which NAT set up will I do? NAT from the router or from the Pfsense?

  • LAYER 8 Global Moderator

    well you can not do nat at pfsense for your ISP, so at the isp device (router) nat the IP that pfsense gets.

    isp1 public, gateway - router1 –- pfsense wan1
    isp2 public, gateway - router2 --- pfsense wan2

    Now pfsense see's 2 different connections with 2 diff networks.

  • Netgate Administrator

    You can leave one router in bridge mode so that one of your pfSense WAN interfaces will have a public IP. Makes it easier for port forwarding, UPNP etc later on.


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