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Subnet calculator

As a first simple tool I’ve put up a basic IPv4 subnet calculator. It’s fully clientside and accepts the common input methods ( or An IPv6 one is also in the works.

Fixing “AH01630: client denied by server configuration”

When setting up Apache from scratch on a new server, and you create a new DocumentRoot for a new VirtualHost, you’ll often find yourself running into:

You don't have permission to access / on this server.
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Taking a useful packet capture using tcpdump

When troubleshooting an issue on any device where network connectivity is impacted, a packet capture is still king. This is not to say every 403 Forbidden error needs to be examined in Wireshark, but when a user reports their browsing saying the connection was reset or a timeout was hit, it might be time to fire up tcpdump.

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