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Cisco-Router.md

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Cisco Routers

Usage

After starting the router, you can open a console to manage and configure it and use the following commands to configure the router:

Getting Help

  • ?: Command shows a list of available commands.

Configuration Mode

  • conf t or config t: Enter terminal configuration mode
  • interface <interface> or int <interface>: Enter interface configuration mode
  • exit: Exit from the current mode

Interface Configuration Mode

  • ip address <ip address> <subnet mask>: Set the IP address of the interface
  • no shutdown: Enable the interface
  • shutdown: Disable the interface

Show

Remember that you can use show commands in default mode.

  • show ip interface brief: Show a summary of the IP addresses of the interfaces. Can be abbreviated to show ip int br
  • show ip interface <interface>: Show detailed information about the IP address of the interface. Can be abbreviated to show ip int <interface>
  • show ip route: Show the routing table
  • show ip arp: Show the ARP table. Can be abbreviated to show arp
  • show ip dhcp pool: Show the DHCP pools

DHCP Server

  • ip dhcp pool <pool name>: Create a DHCP pool
  • network <network address> <subnet mask>: Set the network address of the DHCP pool
  • default-router <ip address>: Set the default gateway of the DHCP pool
  • dns-server <ip address>: Set the DNS server of the DHCP pool

NAT

Static NAT

  • R(interface)ip nat inside : Configure interface as NAT inside interface
  • ip nat outside: Configure interface as NAT outside interface
  • ip nat inside source static <source-ip> <dest-ip> : Configure a static NAT translation

Dynamic NAT

  • access-list 1 permit <ip-address> <subnet-mask>: Permit traffic from
  • ip nat pool <pool-name> <start-ip-addr> <end-ip-addr> netmask <netmask>: #create a NAT pool
  • ip nat inside source list 1 pool <pool-name> : Enable pool