[dns-operations] AWS footnote: DNS firewall rules are UDP only

[Fred Morris]

I just noticed that when configuring firewall rules for an AWS instance,
if "DNS" is chosen then the (only) protocol automagically filled in is
UDP.

To get TCP, you have to create a custom TCP rule.

When you save, the UDP one gets saved as "DNS", the TCP one stays "custom
TCP rule".

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Fred Morris