I have already installed and edited the config file:
root@enrutador:~# cat /etc/avahi/avahi-daemon.conf
[server]
#host-name=foo
#domain-name=local
use-ipv4=yes
use-ipv6=yes
check-response-ttl=no
use-iff-running=no
[publish]
publish-addresses=yes
publish-hinfo=yes
publish-workstation=no
publish-domain=yes
#publish-dns-servers=192.168.1.1
#publish-resolv-conf-dns-servers=yes
[reflector]
enable-reflector=yes
reflect-ipv=no
[rlimits]
#rlimit-as=
rlimit-core=0
rlimit-data=4194304
rlimit-fsize=0
rlimit-nofile=30
rlimit-stack=4194304
rlimit-nproc=3
root@enrutador:~# cat /etc/config/firewall
config rule
option name 'mDNS-GUEST'
list proto 'udp'
option src_port '5353'
list dest_ip '224.0.0.251'
option dest_port '5353'
option target 'ACCEPT'
option src 'lan'
I still can't connect to the Chromecast from the guest device.