<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>bolt.sh — Field Notes</title><description>Engineering writing on BGP, anycast, private cloud, on-prem inference and running your own infrastructure.</description><link>https://bolt.sh/</link><language>en</language><item><title>Where on-prem inference actually beats the API bill</title><link>https://bolt.sh/blog/inference-cost-crossover/</link><guid isPermaLink="true">https://bolt.sh/blog/inference-cost-crossover/</guid><description>A framework for deciding whether to buy GPUs — utilisation, KV cache maths, the hidden operational cost, and the three cases where the answer is obviously yes.</description><pubDate>Wed, 15 Apr 2026 00:00:00 GMT</pubDate><category>ai</category><category>infrastructure</category><category>cost</category></item><item><title>The RPKI and IRR checklist nobody hands you with your first prefix</title><link>https://bolt.sh/blog/rpki-and-irr-checklist/</link><guid isPermaLink="true">https://bolt.sh/blog/rpki-and-irr-checklist/</guid><description>You received an allocation. Here are the records, filters and tests that decide whether the internet accepts your routes or quietly drops them.</description><pubDate>Wed, 04 Mar 2026 00:00:00 GMT</pubDate><category>networking</category><category>bgp</category><category>security</category></item><item><title>Anycast without the hand-waving</title><link>https://bolt.sh/blog/anycast-without-the-hand-waving/</link><guid isPermaLink="true">https://bolt.sh/blog/anycast-without-the-hand-waving/</guid><description>What anycast actually gives you, what it costs operationally, and the four failure modes that surprise teams building their first multi-POP edge.</description><pubDate>Wed, 11 Feb 2026 00:00:00 GMT</pubDate><category>networking</category><category>bgp</category><category>cdn</category></item></channel></rss>