> On 15. Mar 2021, at 12:56, Blake Hartshorn <cont...@blakehartshorn.com> wrote:
> 
> The short version, when I use FreeBSD 13, delivering data can take 5 minutes 
> for 1MB over SSH or HTTP when using IPv6. This problem does not happen with 
> IPv4. I installed FreeBSD 12 and Linux on that same device, neither had the 
> problem.
> 
> Did some troubleshooting with Linode, have ultimately ruled the network 
> itself out at this point. When the server is on FreeBSD 13, it can download 
> quickly over IPv6, but not deliver. Started investigating after noticing my 
> SSH session was lagging when cat'ing large files or running builds. This 
> problem even occurs between VMs in the same datacenter. I generated a 1MB 
> file of base64 garbage served by nginx for testing. IPv6 is being configured 
> by SLAAC and on both 12 and 13 installs was setup by the installer. Linode 
> uses Linux/KVM hosts for their virtual machines so it's running on that 
> virtual adapter.
> 
> I asked on the forums, another user recommended going to the mailing lists 
> instead. Does anyone know if config settings need to be different on 13? Did 
> I maybe just find a real issue? I can provide any requested details. Thanks!
Could you prove a .pcap tracefile, one from the sender, one from the recevier, 
of
a TCP/IPv6 connection, which doesn't work as expected. For example, use your 1MB
base64 garbage transfer.

Best regardes
Michael
> 
> 
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