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IP Forwarding With Cisco Routers Lab Exercises. Cisco File System. Boot - startup the router IOS - Internetworking Operating System keep it in Flash or boot from TFTP Server Configuration files running config - in Memory each configuration line is active immediately start-up config

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cisco file system
Cisco File System
  • Boot - startup the router
  • IOS - Internetworking Operating System
    • keep it in Flash or boot from TFTP Server
  • Configuration files
    • running config - in Memory
        • each configuration line is active immediately
    • start-up config
  • Command
    • show startup-config
    • show running-config
    • show version
initial configuration
initial configuration
  • Setup dialog
      • If a new router, setup is running automatically
      • cisco_prompt# setup
  • Setup will create a new start-up config
      • ip routing yes; but “no” to all routing protocols (especially RIP!)
slide4

Exercise 1Login into the router

  • Connect console cable to the Serial Port
    • Serial connection PC to cisco router console port
    • Console
    • % minicom [-s] [/dev/ttyS0]
    • or
    • % cu -l /dev/ttyS0 -s 9600
  • power on router, watch the loading messages
  • Login
    • Console or Telnet from UNIX
    • Password: cisco
    • name> enable
    • Password: cisco
    • Leave the session: exit
configure interface
Configure Interface
  • Configure Ethernet interface with setup
    • IP address
    • Netmask (0 - 0, 1 - 128, 6 - 254)
    • “ip routing” yes; but “no” to all routing protocols
        • Setup command (interactive)
        • #configure terminal
        • cisco(config)#interface eth o
        • cisco(config)#ip address n.n.n.n mask m.m.m.m
  • configure e0 for row ethernet with Next IP address
    • example: Network 130.65.241.16/29
        • IP address 130.65.241.19
exercise 2 configure ethernet interface
Exercise 2configure ethernet interface
  • Configure Ethernet Interface
    • router>enable
    • router#conf t
    • router(config)#int eth 0
    • router(config-if)#ip addr 130.65.241.xx 255.255.255.xx
    • router(config-if)#no shut
    • router(config-if)#^z
    • router#sho int eth 0
  • Check:
    • telnet to the router from one of the 1E PCs in the row.
exercise 3 check the status
Exercise 3Check the Status
  • Check
    • ping n.n.n.n
    • traceroute n.n.n.n
  • Show
    • Interface:
    • # show interface [eth/serial] 0
    • ARP
    • # sho arp
    • Configuration
    • write terminal
    • show conf (running config)or show running-config
    • show startup-config (boot configuration)
    • Save configuration
    • # write [mem]
exercise 4 1 2 configure static routes
Exercise 4 (1/2)configure static routes
  • configure the router with static routes
  • to create static routes, use the “ip route” command:
    • ip route n.n.n.n m.m.m.m nexthop (g.g.g.g or device)
  • e.g.:
    • router#conf t
    • router(config)#ip route 130.65.241.0 255.255.255.240 130.65.241.129
exercise 4 2 2 configure static routes
Exercise 4 (2/2)configure static routes
  • now add a static default route
  • the default route is represented by net prefix 0.0.0.0 and netmask 0.0.0.0, e.g.
    • ip route 0.0.0.0 0.0.0.0 130.65.241.142
  • use ping and traceroute to test
    • router# ping target-ip-addr
    • router# trace target-ip-addr
exercise 5 1 2 configure passwords
Exercise 5 (1/2)configure passwords
  • there are (at least) 6 passwords to be set: console login password, 4 vty passwords, and the enable password
      • set the console password
        • router(config)#line con 0
        • router(config-line)#password mysecret
      • set the vty passwords
        • router(config-line)#line vty 0 4
        • router(config-line)#password mysecret
        • router(config-line)#exit
      • set the enable password
        • router(config)#enable password mysecret
        • router(config)#^Z
exercise 5 2 2 configure passwords
Exercise 5 (2/2)configure passwords
  • examine the config, note that the passwords are in plaintext
    • # show conf
    • ...
    • enable password mysecret
    • ...
    • line con 0
    • password mysecret
    • ...
    • line vty 0 4
    • password mysecret
    • login
  • encrypt the passwords, then examine the config again
    • router(config)#service password-encryption
    • router(config)#^Z
    • router#sho conf