parhelia:

I'm on 17.01.4, on a TP-Link C2600. After some time, some clients become unroutable from other clients, but are still perfectly fine from the router itself. For example, a printer on wifi is invisible on my mac after some time, but if I ssh to the router, and ping it, it's still there and responding to packets.

From laptop:
PING rxv679.lan (10.1.1.52): 56 data bytes
Request timeout for icmp_seq 0

From router:
PING rxv679 (10.1.1.52): 56 data bytes
64 bytes from 10.1.1.52: seq=0 ttl=64 time=3.284 ms
64 bytes from 10.1.1.52: seq=1 ttl=64 time=3.576 ms

This doesn't seem to happen to anything connected to ethernet. I don't really know how to debug this further, so any hints would be welcome. Also, there doesn't seem to be a definite time when this occurs. Reconnecting the client seems to fix it.