full image - Repost: Having trouble getting WAN IP on pfSense box (Xfinity + Arris modem) (from Reddit.com, Having trouble getting WAN IP on pfSense box (Xfinity + Arris modem))
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Hey guys, I am gonna try and be as detailed as I can. I am a jr network engineer but new to PFsense. I’ve been setting up pfSense on a Dell OptiPlex (bare-metal install, not virtualized). I’m trying to replace my old ASUS router with pfSense and keep my existing Xfinity (Comcast) setup.Current Working Setup:Apartment complex Xfinity Coax → Arris SURFboard modem (NON Xfinity its my hardware) → ASUS Routers → dummy switch.New Setup:Coax → Arris SURFboard modem → Optiplex em0 = built-in NIC (WAN)ue0 = USB 1 GbE adapter (LAN)What’s happening:• The Arris modem shows full sync and DOCSIS Operational (192.168.100.1 page looks good).• pfSense boots and detects both NICs (em0, ue0 show as 1000base-T full duplex).• But the WAN (em0) never receives an IP — ifconfig shows no “inet” line, only “status: active.”• When I try to ping 8.8.8.8 or run the installer’s connectivity test, I get “No route to host / 100% packet loss.”• The installer also warned: “Cannot reach the Netgate servers, please verify your network settings!”What I’ve tried:Spoofed my old router’s WAN MAC for em0.Fully power-cycled modem and pfSense: – Both off for 10 min – Powered modem first, waited until Power/Downstream/Upstream/Online lights were solid – Then powered on pfSense.Confirmed modem is online in its GUI with good signal levels.LAN side (ue0) works fine; DHCP on 192.168.7.0/24 hands out addresses.What I think is happening:Xfinity’s modem might still be hanging onto the old DHCP lease or MAC binding even after spoofing. pfSense never gets a lease, so WAN stays blank.What I dont get is that the modems MAC is not changing and I called Xfinity when I moved in to register it. It works fine with my router, but will not get out on the OptiPlex. Questions:• Should pfSense get an IP immediately once the modem syncs, or does Xfinity require a manual DHCP release?• Has anyone needed to contact Comcast to clear the lease or MAC binding?• Any trick to force pfSense’s WAN DHCP client to retry after modem reboot?• Does toggling the “Local Resolver = true/false” option during install make any difference?Details:– Modem: Arris SB8200 (firmware D31CM-PEREGRINE-1.1.1.0-GA-01-NOSH)– ISP: Xfinity Residential (BULK)– pfSense version: 2.7.2 CE– LAN subnet: 192.168.7.0/24Any advice appreciated!Thanks!
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