Fundamentally, IPv6 should be slower because of the bigger headers/overhead. But it could be faster because CG-NAT detour (if CG-NAT is not on the shortest path). IPv4 and IPv6 could both be faster/slower because of non-congruent peering topology.
Actually, the claim that IPv6 is faster is pretty silly. Ed/ > -----Original Message----- > From: Marco Moock via NANOG <[email protected]> > Sent: Tuesday, December 2, 2025 07:42 > To: [email protected] > Cc: Marco Moock <[email protected]> > Subject: Re: IPv6 Performance (was Re: IPv4 Pricing) > > On 01.12.2025 16:44 Bryan Fields via NANOG <[email protected]> > wrote: > > > At least once or twice a month I'm downloading something and will find > > the IPv4 to transfer significantly faster. Case in point, I > > downloaded the proxmox iso yesterday to a colo server with 50g > > uplinks. It loafed at 2.4 mbytes/s using default wget, which of > > course preferred ipv6. Adding -4 to wget made that shoot up to 80 > > mbytes/s. > > Have you checked packet loss and latency? > > Maybe that is caused by different routes due to peering. > > -- > kind regards > Marco > > Send spam to [email protected] _______________________________________________ NANOG mailing list https://lists.nanog.org/archives/list/[email protected]/message/EBHOWLWPDOYOV2ATJPYBAA2CLI6SMIEE/
