Hi Tim,

> Basically, it's a toggle setting and toggling the IPv6 resets the
> router and I get IPv4 entries in the avahi-browse response (IPv6
> enabled or disabled).  Switching to one of the other AP's, and back
> again, and I just get IPv6 entries appearing, whether IPv6 is enabled
> or disabled on AP0 (which is definitely strange).

Could it be that IPv6 responses are being remembered when talking to a
non-AP0 but then can't be used with AP0?

If the laptop temporarily disabled IPv6 on the Wi-Fi interface then it
would be using IPv4 to all APs?  Something like this should do.
It's temporary, resetting to default on reboot.

    i=wls34        # Change to suit.
    ip a s dev $i  # Show the ‘before’.
    sysctl net.ipv6.conf.$i.disable_ipv6            
    sudo -i sysctl net.ipv6.conf.$i.disable_ipv6=1  
    ip a s dev $i                                   

-- 
Cheers, Ralph.

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