iptables and LAN access.

[Akira]

So, after finding two commands which allowed my containers to correctly discern my client's IP addresses:

https://www.pedrolamas.com/2020/11/04/exposing-the-client-ips-to-docker-containers-on-synology-nas/
sudo iptables -t nat -A PREROUTING -m addrtype --dst-type LOCAL -j DOCKER
sudo iptables -t nat -A PREROUTING -m addrtype --dst-type LOCAL ! --dst 127.0.0.0/8 -j DOCKER

This then breaks my LAN access to a couple of containers which use a VPN to access the network/internet - VPN compose snip:

  privoxy:
    image: binhex/arch-privoxyvpn:latest
    container_name: privoxy
    cap_add:
      - NET_ADMIN
    ports:
      - 8118:8118
      - 9118:9118
      - 9117:9117 #jackett
      - 9080:9080 #qbittorrent
    volumes:
      - "${SSD}privoxy:/config"
      - '/etc/localtime:/etc/localtime:ro'
    environment:
      - VPN_ENABLED=yes
      - VPN_USER=${NEWVPNUSER}
      - VPN_PASS=${NEWVPNPASS}
      - VPN_PROV=custom
      - VPN_CLIENT=openvpn
      - LAN_NETWORK=192.168.0.0/24
      - SOCKS_USER=${ITSME}
      - SOCKS_PASS=${MYCOMPASS}
      - ENABLE_SOCKS=yes
      - ENABLE_PRIVOXY=yes
      - TZ=${TZ}
    networks:
      - synology
    restart: always

I have a container on the docker "synology" network which has firefox inside and I can access jackett and qbittorrent from that, however I cannot access them from my desktop.
After rebooting the NAS I can no longer discern my client IP addresses but can once again access those two containers so I know it's something to do with the command.
Does anyone have any ideas what's going wrong?