Blog

BGP anycast in a /24: what I learned the hard way

Running anycast on a budget /24 allocation sounds fine until your upstreams have different opinions about route dampening.

TCP buffer sizing: what the defaults get wrong

The Linux TCP buffer defaults were set in an era of 100Mbit LANs. Here's how to reason about them for modern workloads.

conntrack table exhaustion: diagnosis and fix

At 200K+ concurrent connections, the default nf_conntrack_max of 65536 isn't just too small — it drops packets silently.