Wifi hotspot blocks ufw

Support & Help Requests Raspberry Pi
1

On Raspberry pi 4 with Ubuntu Mate 22.04
I want to create a wifi hotspot. The mobile connects but the connection is blocked by the ufw firewall.
What rules should I add to ufw?

2

Did you see

  • To ensure that the reason of failure is ufw please check its status with the command sudo ufw status. If ufw is active please show us ufw rules in effect.
  • If the purpose of your hotspot is to provide Internet access, then verify if routing is turned on and check routing table.
2 Likes
3

$ sudo ufw status
Stav: aktivní
53 ALLOW 10.42.0.1

After disabling ufw, the connection to the mobile works.
I don't know what routing is.

4

By default, UFW is configured to deny all incoming connections but allow all outgoing connections That is you need to allow incoming connections from the whole hotspot-associated subnet or from your mobile IP only. Or disable UFW.

The following link definitely may help to accomplish the task:

2 Likes
5

I don't want to disable ufw, I'm looking for the right rule.
Terminal output:
$ ip addr
1: lo: ...
2: eth0: ...
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether dc:a6:32:25:1e:03 brd ff:ff:ff:ff:ff:ff
inet 10.42.0.1/24 brd 10.42.0.255 scope global noprefixroute wlan0
valid_lft forever preferred_lft forever
inet6 fe80::abe6:f2c3:a91e:32c8/64 scope link noprefixroute
valid_lft forever preferred_lft forever

$ sudo nano /etc/default/ufw
IPV6=yes

6

It looks like you need rule

sudo ufw allow from 10.42.0.0/24

7

added

~$ sudo ufw status
Stav: aktivní
Anywhere ALLOW 10.42.0.0/24

but it didn't help

8

Try to disable/enable UFW to ensure that the rule is activated. If that would not help... I'm sorry, I'm out of ideas for now.