Blog
Notes from the network.
Whatever comes up in production or in the lab and seems worth explaining — troubleshooting, design decisions, and the things you only grasp on second look.
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24 July 2026
EVE-NG: the lab where I'm allowed to break everything
My favourite tool: building multi-vendor networks from real images in the browser, breaking them safely, and understanding along the way why something works.
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22 July 2026
DNS in hybrid environments
Why Azure Private DNS zones cannot be delegated, how the DNS Private Resolver closes the gap to your own data centre — and which pitfalls remain.
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21 July 2026
MTU and MSS: when large packets disappear
The connection is up, but as soon as real data flows everything stalls. On path MTU discovery, blocked ICMP, and why MSS clamping at the tunnel is the practical fix.