Missing hint to allow esp protocol in firewall for encrypted overlay network

[kaotika]

File: network/overlay.md

I struggled about the problem, that encrypted overlay networking in a docker swarm needs the firewall to allow esp protocol packages. I found this out after days of frustrated searching, trying and testing. I'am not alone with the problem (e.g. moby/moby#26523).

Please, please, please add a hint in the Prerequisites and Encrypt traffic on an overlay network section to allow esp packages. This simple hint most likely prevents a lot of trouble!

Cheers and thanks for this great software!

[docker-robott]

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[docker-robott]

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