OpenVPN docker ARM/PI configured to use TCP/UDP


docker volume create --name $OVPN_DATA

docker run -v $OVPN_DATA:/etc/openvpn --rm giggio/openvpn-arm ovpn_genconfig -u udp://

docker run -v $OVPN_DATA:/etc/openvpn --rm -it giggio/openvpn-arm ovpn_initpki nopass

docker run -v $OVPN_DATA:/etc/openvpn -d --name openvpn -p 1194:1194/udp --cap-add=NET_ADMIN giggio/openvpn-arm

docker run -v $OVPN_DATA:/etc/openvpn --rm -it giggio/openvpn-arm easyrsa build-client-full PIRATE nopass

docker run -v $OVPN_DATA:/etc/openvpn --rm giggio/openvpn-arm ovpn_getclient PIRATE > PIRATE.ovpn


TCP vs. UDP – Pros & Cons
By default, OpenVPN is configured to use the UDP protocol. Because UDP incurs minimal protocol overhead (for example, no acknowledgment is required upon successful packet receipt), it can sometimes result in slightly faster throughput. However, in situations where VPN service is needed over an unreliable connection, the user experience can benefit from the extra diagnostic features of the TCP protocol.

As an example, users connecting from an airplane wifi network may experience high packet drop rates, where the error detection and sliding window control of TCP can more readily adjust to the inconsistent connection.

Another example would be trying to open a VPN connection from within a very restrictive network. In some cases port 1194, or even UDP traffic on any port, may be restricted by network policy. Because TCP traffic on port 443 is used for normal TLS (https) web browsing, it is very unlikely to be blocked.

Instead of choosing between UDP and TCP, you can use both. A single instance of OpenVPN can only listen for a single protocol on a single port, but this image makes it easy to run two instances simultaneously. After building, configuring, and starting a standard container listening for UDP traffic on 1194, you can start a second container listening for tcp traffic on port 443:

docker run -v $OVPN_DATA:/etc/openvpn -d -p 443:1194/tcp --privileged giggio/openvpn-arm ovpn_run --proto tcp

References for this post

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