Oh yeah, we've already run into this with Cambium's ePMP line - their default DHCP setting in NAT mode uses a pool of 10 addresses, including the radio/gateway itself. If the subscriber's router is in bridged mode, they rapidly run out of internal IPs. It's an easy fix to pushthe size up to 50 or more addresses, but you're absolutely right. There are a lot of routers currently in use which were designed before every device in the house needed an IPv4 address, and connected speakers, light bulbs, switches, and everything else IoT are going to create a million minor problem calls over the next few years.
From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Ken Hohhof Sent: Wednesday, August 14, 2019 12:40 PM To: 'AnimalFarm Microwave Users Group' Subject: [AFMUG] IoT and LAN IPs With all the Internet enabled stuff people are putting in their houses now, are conventional routers going to run out of LAN IP addresses? Yes, I know about IPv6 (and let's not unleash that holy war), also about smarthome hubs. But most people seem to be just buying stuff like fridges and toasters and doorbells and lightbulbs and cameras, and hooking them up to their WiFi router. Almost any router you buy at the store is going to have a LAN subnet like 192.168.1.0/24 and may not allocate all of that for DHCP range. So there are at most 253 available addresses, and possibly as little as 50 or 100. Until recently this should have been way more than needed, but it seems inevitable that homes will soon have more than 253 connected devices. May just mean switching to a bigger subnet, but average Joe doesn't know how to do that. Meanwhile if during the day his "things" have taken the entire DHCP range and he gets home and his phone or laptop can't get an IP, he things it's an Internet problem.
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