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• The sys admin's daily grind: traceroute

  Like every admin, Charly regularly uses the classic traceroute tool. If unfriendly digital natives interfere with an ICMP filter, he simply switches to a clever alternative like LFT.

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• Charly's Column

  Conventional, woodpecker-style port knocking is open to sniffing and brute force knocking attacks. Sending an encrypted packet with an access request to the server is safer and more modern. Learn more about Firewall Knock Operator, a.k.a. Fwknop.

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• Charly's Column: tcpflow and HugeURL

  First the fun, then the pleasure: This month, we look at a TCP that administrators have to take seriously, followed by some URL fun.

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• The sys admin's daily grind: DNSDiag

  If some transactions take an inexplicably long time, you don't have to blame yourself for the delayed transmission of user data. Name resolution issues might be to blame. Sys admin Charly has three tools to study the DNS server.

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• Charly’s Column: S3QL

  Sys admin Charly has been an enthusiastic amateur photographer for many years. Recently, he started worrying about something happening to his rapidly expanding photo collection. Can the cloud save the day?

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