Subj : FidoNews submission
To   : Michiel van der Vlist
From : Alex Galiyev
Date : Fri May 30 2025 10:25 am

Hello Michiel!

Friday May 30 2025 11:32, you wrote to me:

AG>> Tell this to our Comcast ISP users in Pennsylvania, in order to
AG>> get better speeds, they have to disable ipv6.
MV> Then Comcast and/or their users are doing something wrong. Native IPv6
MV> is definitely not slower than IPv4.

It's definitely slower by design:
- Bigger headers (40 B vs. 20 B) add per-packet overhead.
- Path MTU Discovery failures (blocked ICMPv6 "Too Big") lead to drops/retries.
- Transitional tunnels (e.g. 6in4, Teredo) introduce extra hops and encapsulation cost.
- Less hardware offload and OS-stack tuning for IPv6 vs. decades of IPv4 optimizations.

Alex

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