First I had to make the setting in the UI (automatic channel selection, just to be sure that wasn’t the problem) and than reboot the firewall. There was my fast ipfire wlan.
And then DHCP on blue stopped working. When I switch back to 802.11gn DHCP has no problem, back to 802.11ac again and clients would wait forever for an ip address.
Fixed ip on 802.11ac works well.
I didn’t find the dhcp-logs yet, so could no further investigate. A quick search gave no clue.
The DHCP server and hostapd log to /var/log/messages.
You should see the connection of the wireless client to hostapd. Thereafter a DHCPREQUEST/DHCPDISVCOVER for the client ( identfied by the MAC ) should show up. Followed by the answer of dhcpd (DHCPACK/DHCPOFFER).
Thanks for the reply! I couldn’t find syslog and was in a hurry so I overlooked messages. Thanks for pointing that out.
Solved the problem I think.
I used http://192.168.21.1:81/proxy.pac as an Option value for wpad in DHCP. That should have been “http://192.168.21.1:81/proxy.pac” (so with the quotes). Man, that took me some hours to figure that out, Without the quotes DHCP just stops.
Dunno yet why switching back to 802.11gn solved this earlier this evening as well. I’ll have to test if that is actually true and check the log for clues.