Public bug reported:
SRU Justification:
[ Impact ]
When a wi-fi hotspot is being broadcast, NetworkManager does not
automatically configure all firewall rules as needed for clients to
access the internet.
[ Test Plan ]
Start wi-fi hotspot on device running ufw that is connected to the
internet
[ Actual result ]
Clients cannot connect to the internet via the hotspot. Only after adding
custom firewall rules such as those described above can the client connect to
the internet.
[ Expected result ]
Clients can connect to the internet via the hotspot
[ Fix ]
At minimum, the following is needed to enable this:
1. Enable routing from wireless adapter to wired adapter (ex: sudo ufw route
allow in on wlP9s9 out on enp1s0 (varies depending on adapter names))
2. Set iptables forwarding rules correctly (ex: sudo iptables -P FORWARD ACCEPT)
3. If the host is running its own DNS / DHCP servers, those will also have to
be allowed by the firewall
(Discussion ongoing upstream)
[ Where problems could occur ]
Specifics to be researched
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2128668
Title:
Wi-Fi hotspot startup does not configure firewalls as needed for
internet sharing
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