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Useful Wireless Networking Connection Commands – Ubuntu/Debian Linux

Here I am trying to explain some useful Linux commands for wireless networking

iwlist scan – shows wireless networks that are available in the area with basic encryption information
lshw -C network – Shows Details of Interface card and drivers of each networking device

lspci -nn – Shows PCI vendor and device codes as both numbers and names of hardware connected to the pci bus
lsusb – Shows USB connected hardware
lshw -C usb – Additional info on USB related hardware (good for USB dongles)

route -n – Lists kernel IP routing table — Good for troubleshooting problems with the gateway

sudo route add default gw 192.168.1.1 – Example of how to set the default gateway to 192.168.1.1

sudo route del default gw 192.168.1.1 – Example of how to delete the default gateway setting

sudo modprobe ***** – Loads the kernel module **** . (Example usage – sudo modprobe ndiswrapper, sudo modprobe r818x, sudo modprobe ath_pci)

sudo modprobe -r **** – Unloades the kernel module ****. (Example usage – sudo modprobe -r ndiswrapper)

ifconfig – lists IP address

sudo ifup/ifdown – Brings up/down the interface and clears the routing table for the specified interface

sudo ifconfig up/down – Brings up/down the interface for the specified interface

sudo dhclient – Request IP address from DNS server for specified interface

sudo dhclient -r – Release IP address associated with specified interface

sudo iptables -L – Lists firewall rules

sudo iptables -F – Flush all firewall rules

dmesg | more – Lists boot log — good for troubleshooting problems with modules/drivers not being loaded

uname -r – Displays kernel version

/etc/udev/rules.d/70-persistent-net.rules – File which assigns logical names (eth0, wlan0, etc) to MAC addresses

cat /etc/resolv.conf – Lists DNS servers associated with network connections (Network Manager)

/etc/dhcp3/dhclient.conf – File which sets or modifies dns (domain name servers) settings

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