All settings in the modem / router are correct, and you can ssh from internally to your host meaning that your ssh / dropbear is working. The issue is not your internal network or modem. Unfortunately, your ISP has a hardened firewall not allowing forwarding traffic into your network making it so you cannot access your host externally.
Connect via Ethernet and install wpasupplicant and net-tools.
sudo apt update
sudo apt install wpasupplicant net-tools
Use this .yaml file... use the EXACT same spacing, indentation, and no tabs...
I suggest that it is Network Manager that is interfering. I also don't think that sudo ifconfig device_name on is correct. Please try:
sudo service NetworkManager stop
sudo ifconfig wlp0s20f3 down
sudo iwconfig wlp0s20f3 mode monitor
sudo ifconfig wlp0s20f3 up
Start wireshark and see if there is any improvement.
It's because Canonical has disabled SMB1 for security reasons. SMB2/SMB3 still works.
smbtree command also no longer works.
Use //server/pathname or //IP/pathname when using the Connect to Server, or in your /etc/fstab
Edit /etc/samba/smb.conf, and add this to the Network section, and restart smbd and nmbd...
# allow SMB1
client min protocol = ...
This message generally indicates that you try to remove a route from a routing table, but such a route does not exist in the table.
When bringing the interface down, ifdown is trying to remove any routes that are associated with a given interface. This message appears when ifdown "thinks" it has to remove a route (because it appears somewhere in ...
I had the same problem with the network being offline after an update on Ubuntu 20.x.
I found this bug report: https://bugs.launchpad.net/netplan/+bug/1922898
Here is how I was able to fix my Ubuntu 20.x servers:
Download latest netplan.io_0.102: