Re: WiFi Hotspot Disable Neighbor discovery,Ask

[Alex Buie <alex.buie@datto.com>]

You -might- need to fiddle with the nf-call-iptables sysctls for those
firewall rules to work. I haven't personally tried this for a wifi
adapter in infrastructure mode (only wired bridges) but it might
help/apply to your setup.

See https://wiki.libvirt.org/page/Net.bridge.bridge-nf-call_and_sysctl.conf
for some info.


R's,

Alex

On Mon, Jun 15, 2020, 11:38 PM Hooman <mailinglister.hooman@gmail.com> wrote:
>
> Hi,
>
> I am using WiFi hotspot feature of Ubuntu 18.04 to create a hotspot for
> my devices. I need to prevent different devices on the network from
> contacting each other.
>
> More specifically, I have two phones on the network, I would like them
> not to be able to send any packets to each other. Right now if phone 1
> is using IP address 10.42.0.172 and phone 2 is using 10.42.0.59, I can
> use phone 1 to ping 10.42.0.59.
>
> I would like to disable connections between different hosts on the
> network created by the hotspot.
>
> I tried using iptables to drop local traffic. However, it seems like the
> iptables don't have any effect on these packets.
>
> I do see local packets on wireshark though. I'm wondering if local
> packets are forwarded directly without hitting the iptable rules.
>
> Is it possible to use iptables or ebtables to filter these packets? Is
> there any other solution to this?
>
> Thank you
>