Linux-Basics-Complete-Course-With-Notes-Slides

Switching & Routing

#### Switching

• Switching helps to connect the interface within same network.

  

• To see the interfaces on the hosts use ip link command

  [~]$ ip link
  eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode
  DEFAULT group default qlen 1000

• To connect to the switch we use ip addr add command

  [~]$ ip addr add 192.168.1.10/24 dev eth0

#### Routing

• Router helps to connect to two seprate networks together.

  

• To see the existing routing table configuration run the route command.

  [~]$ route
  Kernel IP routing table
  Destination Gateway Genmask Flags Metric Ref Use Iface

• To configure a gateway on system B to reach the system on other network run

  [~]$ ip route add 192.168.2.0/24 via 192.168.1.1

  [~]$ route
  
  Kernel IP routing table
  Destination Gateway Genmask Flags Metric Ref Use Iface
  192.168.2.0 192.168.1.1 255.255.255.0 UG 0 0 0 eth0

• To see the ip addresses assign to interfaces use

  [~]$ ip addr

  [~]$ ip route

• To make this changes permanent you must set them in /etc/network/interfaces file.