Found live: new clients on the archipelago SSID couldn't get an IP
address at all. configure()'s users_to_router rebuild replaced the
nodogsplash package's stock default list (DNS, DHCP, SSH/Telnet to the
router) with only our two TollGate-specific ports (2121, 2050) —
dropping `allow udp port 67`, so DHCP DISCOVER from an unauthenticated
client hit ndsRTR's default REJECT before ever reaching dnsmasq.
Carries over DNS (53) and DHCP (67/udp) from the stock default —
without them a client can't get an IP or resolve anything before
authenticating. Deliberately does not carry over SSH/Telnet (22/23):
the stock default exposes router shell access to every unauthenticated
device on the network, which isn't an appropriate default for a public
pay-as-you-go hotspot.
ssmithx
c1f191128f