# ethtool eth0 -------- Show the ethernet status (replaces mii-diag)
# ethtool -s eth0 speed 100 duplex full # Force 100Mbit Full duplex
# ethtool -s eth0 autoneg off # Disable auto negotiation
# ethtool -p eth1 # Blink the ethernet led
# ip link show # Display all interfaces on Linux
# ip link set eth0 up # Bring device up
# ifconfig eth0 up
# ip addr show # Display all IP addresses on Linux
# ip neigh show # Similar to arp -a
# arp -a # Check the router (or host) ARP entry
# traceroute ctechz.blogspot.in # Print the route path to destination
# netstat -s # System-wide statistics for each network protocol
# arping 192.168.16.254 # Ping on ethernet layer
Routing
# route -n # Linux or use "ip route"
# netstat -rn # Linux, BSD and UNIX
# route delete -net 192.168.20.0 netmask 255.255.255.0
add -p to make the route persistent.
# ethtool -s eth0 speed 100 duplex full # Force 100Mbit Full duplex
# ethtool -s eth0 autoneg off # Disable auto negotiation
# ethtool -p eth1 # Blink the ethernet led
# ip link show # Display all interfaces on Linux
# ip link set eth0 up # Bring device up
# ifconfig eth0 up
# ip addr show # Display all IP addresses on Linux
# ip neigh show # Similar to arp -a
# arp -a # Check the router (or host) ARP entry
# traceroute ctechz.blogspot.in # Print the route path to destination
# netstat -s # System-wide statistics for each network protocol
# arping 192.168.16.254 # Ping on ethernet layer
Routing
# route -n # Linux or use "ip route"
# netstat -rn # Linux, BSD and UNIX
# route add -net 192.168.20.0 netmask 255.255.255.0 gw 192.168.16.254
#route add -net 192.168.20.0 netmask 255.255.255.0 dev eth0
# route add default gw 192.168.51.254# route delete -net 192.168.20.0 netmask 255.255.255.0
add -p to make the route persistent.
Configure additional IP address
# ifconfig eth0 192.168.50.254 netmask 255.255.255.0 # first ip
# ifconfig eth0:0 192.168.51.254 netmask 255.255.255.0
# Second IP
Changing the MAC Address
# ifconfig eth0 down
# ifconfig eth0 hw ether 00:01:02:03:04:05
Port's In Use
# netstat -an | grep LISTEN
# lsof -i # List all Internet connections
# netstat -anp --udp --tcp | grep LISTEN
# netstat -tup # List active connections to/from system
# netstat -tupl # List listening ports from system
# netstat -ano # Windows
IP Forwarding for routing in linux machines
# cat /proc/sys/net/ipv4/ip_forward # Check IP forward 0=off, 1=on
# echo 1 > /proc/sys/net/ipv4/ip_forward
or edit /etc/sysctl.conf with:
net.ipv4.ip_forward = 1
net.ipv4.ip_forward = 1
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