Download image alpine/socat:latest using Synology Docker GUI on 'Register' page or with 'docker pull alpine/socat:latest'

Now you can configure your port forward. I've used it to forward IPv4 requests to an IPv6 address:

docker run -d --restart=always --name socat_6281_Backup \
   --network="host" \
   alpine/socat \
   TCP4-LISTEN:6281,fork,su=nobody TCP6:[2a00:61e0:41b1:dc01:211:32ff:fe6c:13e5]:6281




More info: https://hub.docker.com/r/alpine/socat

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