I have an ER-X and I use QOS, FW routing and MDNS to use chromecasts etc across subnets. Are these features available? Thanks!

Hello I was wondering in Omada where I can find the mDNS service ? I have a TL-R605 router but some IoT devices (especially the once that use Apple HomeKit) do not work or better are unreachable when

How can I get rid of this failures ? How can I identify which clients do that and why ? Regards Jörg