I've encountered a really weird problem at my home network. My current network is set up with just a single vlan, with all of my devices on it. The subnet is 10.0.0.x/24. But, I also have a set of static/public IP addresses (70.x.x.104-70.x.x.109) that I leased from Centurylink (my ISP), with 70.x.x.110 as the gateway for the static IPs. The 70.x.x.110 address was assigned specifically for my modem/router, and up to this point it has always worked to set up the servers that need static IPs with the correct IP address, a subnet of 255.255.255.248, and a gateway of 70.x.x.110 (public IP of the modem/router).
I've got a few servers in a rack that are being used as XenServer VM hosts. Those are all connected to a 48 port HP switch (V1910-48G). I don't have any special stuff set up on it, currently everything is on a single default VLAN on the switch, and the switch is connected directly to the gateway.
Ever since I created a new VM to host pfSense, I've been having problems getting static/public IPs to work on any of the VMs. I intended to set up pfSense on a separate VLAN, but forgot to switch the tag for the VM before I turned it on and installed it. It only had a single NIC on the VM, and I thought I had disabled routing/firewalling when I went through the initial configuration. However, ever since the install finished and pfSense booted up, any servers with static/public IP addresses are not able to ping/access anything on the network, including the gateway. There is no response at all when I try to ping the gateway (70.x.x.110). Even with the pfSense box shut down (which it has been ever since I saw the static IP issue), I'm still not able to either send or receive traffic on the VMs with static/public IPs.
All other network traffic works. I can access the internet successfully when I'm on the 10.0.0.x subnet, but I'm currently using the public IPs to host some game servers, and they are unavailable since they use the public IPs. I wasn't sure if this is an ARP issue or if routing configuration got changed somewhere - I don't know what all pfSense does upon install to change the network it is attached to.
I have factory reset both my modem/router (C2100T) and my switch, and cleared all DNS on a couple of Windows VMs that I was using to test the issue. Neither of those fixed the problem. Any ideas as to what could be happening?