I'd like to buy a CHEAP router to keep for emergencies or diagnostics. I have FTTC/VDSL, so it needs to support PPPoE WAN-side to connect to the VDSL modem. LAN side it only needs a single port to connect to a switch (but more not a problem, obviously). No need for wireless. Support for an IPSec router-to-router VPN is nice to have, but not essential. NAT firewall is essential.