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IP Forwarding With Cisco Routers Lab Exercises

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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IP Forwarding With Cisco Routers Lab Exercises

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  1. IP Forwarding With Cisco Routers Lab Exercises

  2. 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

  3. 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!)

  4. 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

  5. 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

  6. 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.

  7. 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]

  8. 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

  9. 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

  10. 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

  11. 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

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