If you are running a bridged/relayd network with macs on it you may need to also forward the multicast broadcasts (mDNS related) that allow the devices to automatically discover each other. On the WRT wifi client side, there is a pkg called avahi-daemon and you can configure to operate in “reflector” mode to forward these broadcasts across the specified interfaces. Running this service along with the dhcprb C program which takes care of layer 2 arp requests & dhcp gateway forwarding has been pretty smooth so far!

74:DA:88:8F:50:00  -47 dBm / -89 dBm (SNR 42)  990 ms ago
	RX: 1300.0 MBit/s, VHT-MCS 9, 80MHz, VHT-NSS 3   6413214 Pkts.
	TX: 1170.0 MBit/s, VHT-MCS 8, 80MHz, VHT-NSS 3   3557598 Pkts.

 2570 root       704 S    ./dhcprb br-wan wlan0

# /etc/avahi/avahi-daemon.conf

[server]
allow-interfaces=br-wan,wlan0
use-ipv4=yes
use-ipv6=no
check-response-ttl=no
use-iff-running=no

[publish]
disable-publishing=yes
publish-addresses=no
publish-hinfo=no
publish-workstation=no
publish-domain=no
publish-resolv-conf-dns-servers=no

[reflector]
enable-reflector=yes
reflect-ipv=no

[rlimits]
#rlimit-as=4194304
rlimit-core=0
rlimit-data=4194304
rlimit-fsize=0
rlimit-nofile=30
rlimit-stack=4194304
rlimit-nproc=3