Disabling ipv6 globally does not apply to all adapters

[DavHau]

NixOS version: 19.09

I disabled ipv6 via networking.enableIPv6 = false; like described in the manual, but it doesn't apply for my wifi adapter as you can see:

$ sudo sysctl -a | grep disable_ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.br-7e76217ab500.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.docker0.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.tun0.disable_ipv6 = 1
net.ipv6.conf.tun1.disable_ipv6 = 1
net.ipv6.conf.vboxnet0.disable_ipv6 = 1
net.ipv6.conf.virbr0.disable_ipv6 = 1
net.ipv6.conf.virbr0-nic.disable_ipv6 = 1
net.ipv6.conf.wlp2s0.disable_ipv6 = 0

The interface has ipv6 addresses and when I try to ping google it uses ipv6.

[jwygoda]

I'm experiencing the same issue. I had to apply a manual fix on a single interface using a normal sysctl.
net.ipv6.conf.wlp2s0.disable_ipv6

[stale]

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[DavHau]

Still an issue in nixos 20.03 as of now

[DavHau]

Closing in favor of duplicate issue: #87802