minidlna multcast through 1 openbsd router with mcast-proxy on internal network

[Didier Wiroth]

Hello,
I'm not a network expert so please apologies for any mistakes or
misunderstandings.

I'm changing my home network and I would like to route minidlna broadcasts
from my openbsd server to my other internal network which is using an
openbsd/firewall/router.

As of now ... I didn't succeed no clients (wifi or cabled) beside the
opnebsd-internal-router (192.168.{1,2,3}.0/24) cannot see any minidlna
broadcast from my 192.168.103.25 openbsd dlna server.

I thought I could use mcast-proxy to solve the problem and installed it.
https://github.com/Esdenera/mcast-proxy

The dlna (openbsd server) is on the network 192.168.103.25 (192.168.103.0/24
which is the fritzbox network and connects to my internet provider)
All the dlna client are on the internal wifi or cabled networks:
192.168.{1,2,3}.0/24.

Thanks for any help!

Here is the my network layout (I hope it kept the formatting while posting):
fritzbox (internal network 192.168.103/24)
\
 int_if(192.168.103.1)
/
switch(1) -----em0 192.168.103.25---openbsd-server (running minidlna)
\         \----other devices
 \
 em0 192.168.103.178
  \
   openbsd-internal-router (networks 192.168.1/24,192.168.2/24 wlan10,
192.168.3/24 wlan20)
   /
   em1 192.168.1.1
   (wlan10 192.168.2.1 vlandev em1)
   (wlan20 192.168.3.1 vlandev em1)
 /
switch(2)
|
--other devices

Here is the changes I made on the openbsd-internal-router:
$ cat /etc/sysctl.conf
net.inet.ip.forwarding=1
net.inet.ip.mforwarding=1

$ cat /etc/rc.conf.local
dhcpd_flags="em1 vlan10 vlan20"
multicast=YES
pkg_scripts=mcastproxy

$ cat /etc/mcast-proxy.conf
interface em0 {
        upstream
}
interface em1 {
        source 192.168.103.0/24
        downstream
}
interface wlan10 {
        source 192.168.103.0/24
        downstream
}
interface wlan20 {
        source 192.168.103.0/24
        downstream
}

$ doas cat /etc/pf.conf
table <trusted>  { 192.168.1.0/24 192.168.2.0/24 192.168.3.0/24 }
int = "{ em0 em1 vlan10 vlan20 }"
set skip on lo
block quick on $int inet proto tcp from !<trusted> to $int port ssh
block return    # block stateless traffic
pass allow-opts # required for igmp traffic
# By default, do not permit remote connections to X11
block return in on ! lo0 proto tcp to port 6000:6010
---
Didier