[SOLVED] after changing ISP no incoming IPv4 connections - IPV6 works fine

[ryp43]

Hi friends!

I had the following working IPv4/IPv6 OPNsense setup: VDSL2 router configured as bridge -> PPPoE -> OPNsense

Two days ago I moved to a new ISP, got credentials, set them under the WAN interface, and thought that everything is fine. All clients have an internet connection with both protocols... until I noticed that there are zero incoming IPv4 connections. Tried to connect to my network from outside with an IPv4 public address and it failed with no evident logging under Firewall-> Live View (I have all possible logs enabled under System->Settings->Logging).

Connecting with the IPv6 public address works fine.

Did some investigating and I see only a single thing that changed: with the new ISP, my IP address is 100.88.xx.xx/32  while with the previous ISP it was equal to the public IP.

I have tried disabling “Block private networks” and “Block bogon networks”, but still don’t see anything.

Will appreciate any help!

Thanks in advance

[seed]

Looking at the IP you mentioned:

100.88.xx.xx/32

it looks like CGNAT caused by your ISP.
So its not an issue caused by OPNsense or any other router/firewall in your network.