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A comment on History of 127/8 as localhost/loopback addresses (2021). Parent comment

Re:History of 127/8 as localhost/loopback addresses (2021) by vlan0 on Wednesday May 25, 2022 @05:11PM (#31510613)
>I have a whole bunch of network gear circa 2010 in production

I ran into this 10 years ago. I decided to roll out IPv6 to clients. Router docs said it was supported. Then I watched CPU usage peg because every packet hit the CPU. Turns out it was implemented in software; no ASIC support. Was quite the buzz kill.

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Re:History of 127/8 as localhost/loopback addresses (2021) by p_l on Wednesday May 25, 2022 @11:03PM (#31513912)
Now consider that there are network components in the wild that have literal latch on first octet equaling 127 which triggers packet drop, and this proposal could drop hw acceleration for v4 too
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