Moving on

[22/7]

to another sbc

[MrEngman]

My network using an old windows server doesn't like ipv6 to much so I have disabled ipv6 by creating the file /etc/modprobe.d/ipv6.conf and added the line

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blacklist ipv6

Works for a variety of Pis including the Pi4.

MrEngman

[22/7]

moving on

[trejan]

I added

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sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1

to /etc/rc.local and it did the trick.

You don't need to use sudo as rc.local runs as root anyway.

Whilst changing the sysctl in rc.local does work, it isn't the right place to do it. Create a file called disable-ipv6.conf in /etc/sysctl.d with the contents "net.ipv6.conf.all.disable_ipv6 = 1"

From /etc/sysctl.d/README.sysctl

Kernel system variables configuration files

Files found under the /etc/sysctl.d directory that end with .conf are
parsed within sysctl(8) at boot time. If you want to set kernel variables
you can either edit /etc/sysctl.conf or make a new file.

The filename isn't important, but don't make it a package name as it may clash
with something the package builder needs later. It must end with .conf though.

My personal preference would be for local system settings to go into
/etc/sysctl.d/local.conf but as long as you follow the rules for the names
of the file, anything will work. See sysctl.conf(8) man page for details
of the format.

[andrum99]

Add the following to the end of the single line of text in the file /boot/cmdline.txt:

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ipv6.disable=1

This also has the advantage that you can add it from Windows/OSX before you boot the Pi, since the boot partition is readable under those operating systems.

[22/7]

moving on

[trejan]

I like the cmdline.txt option but would that still be considered incorrect compared to trejans suggestion?

Doing it from cmdline.txt is fine.