Linux network solutions for Ubuntu

linux network solutions

$ rfkill list
0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

$ hciconfig
hci0:    Type: BR/EDR  Bus: USB
    BD Address: 10:08:B1:2F:93:F4  ACL MTU: 820:8  SCO MTU: 255:16
    UP RUNNING 
    RX bytes:85080 acl:73 sco:0 events:9855 errors:0
    TX bytes:2386672 acl:5407 sco:0 commands:7061 errors:0

$ uname -r
4.2.0-16-generic


solution for the above bluetooth is:
rfkill unblock bluetooth
systemctl enable bluetooth.service
systemctl start bluetooth.service

Weak signal for WIFI
sudo tee /etc/modprobe.d/rtl8723be.conf <<< "options rtl8723be ant_sel=1"

Fedora (solution)changes  Tested on Fedora 27
There's a problem with the kernel driver, the firmware, or the manufacture configuration with that chipset that it often doesn't get the right antenna. Create a file called /etc/modprobe.d/rtl8723be.conf with the line options rtl8723be ant_sel=1. Do modprobe -r rtl8723be, then modprobe rtl8723be. If it still has the problem then change the line to have ant_sel=2 instead and reload the module again.

To check signal strenth,
watch -n1 iwconfig

Sorting hanging issues on ubuntu 16.04 use the following commands.

    sudo nano /etc/default/grub
    There is a line in that: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" (like this), replace with: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=1"
    Save it (CTRL+O)
    sudo update-grub
    sudo reboot
    
    for the firewall use this link https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-14-04