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I have been worked for a regional ISP 10 years ago and having an architecture like that one, would be a godsend. With centralized BNGs we were not able to apply upstream QoS policies for subscribers on the backhaulings and we had to apply policies on DSLAM access ports.

We ended using a couple of cheap Mikrotik as PPPoE concentrators for every access room, in a similar way as you did. But the reliability of Mikrotik routers was not the best

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OpenWISP: https://news.ycombinator.com/item?id=42953414

From "Open Hardware Ethernet Switch project, part 1" https://news.ycombinator.com/item?id=43969857 :

> There are 48+2 port switches with OpenWRT support

Are there 48 port switches with 8 or more cores?

Edit:

From "Show HN: Spliff – Correlating XDP and TLS via eBPF (Building a Linux EDR)" (2026) https://news.ycombinator.com/item?id=46663446 :

> the current "Golden Thread" correlation architecture fundamentally requires userspace + kernel cooperation that can't be fully offloaded.

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