Whilst having a play trying to restrict my work laptop and phone from accessing the network, i've managed to block them. They can connect to the network, but when i attempt to search for other devices or access the internet, nothing works. Unfortunately, i can't remember what i've done. What might i have done? And is there an easy way to search for this using the MAC address for my devices?
few things you may have done:
blocked LAN to LAN traffic in bridge, filter, or IP - > Firewall -> Filter
you might give them a smaller subnet on DHCP setting. for example, /32, instead of the /24
you may have blocked broadcast on them
change your laptop manually to static IP.
check your firewall rules, Bridge filter rules, look for the ones with Action : Drop (disable all your firewall rules and check, then you know if it is the firewall rules. you can easyly enable them again)