Network Technologies Lab Sunday Exercises gmacri@sunu.rnc.ro

1. Network Technologies Lab Sunday Exercisesgmacri@sunu.rnc.ro

2. exercise 1ping command • Use ping command • Windows 95 • msdos prompt: ping target-address • Windows 95 application PC1 d:\win95\cyber.zip • Debian Linux • use man command to get the parameters of ping command • Cisco router (look to the exercise no. 6 and 10) • ping command

3. exercise 2traceroute command • Use traceroute command • Windows 95 • msdos prompt: tracert target-address • Windows 95 application PC1 d:\win95\tpwins32.zip • Debian Linux • use man command to get the parameters of traceroute command • Cisco router (look to the exercise no. 6 and 10) • trace command

4. exercise 3initial configuration • serial connection from PC to cisco router console port • % minicom /dev/ttyS0 • power on router, watch the loading messages • initial config dialog • configure e0 for row ethernet and leave other interfaces unconfigured • ip routing yes; but “no” to all routing protocols (especially RIP!)

5. exercise 4configure ethernet interface • telnet to the router from one of the 1E PCs in the row. • router>enable • router#conf t • router(config)#int e0 • router(config-if)#ip addr 161.53.75.xx 255.255.255.240 • router(config-if)#no shut • router(config-if)#^z • router#sho ip int br

6. exercise 5 (1/2)configure static routes • configure the router with the same static routes • to create static routes, use the “ip route” command: • ip route net-prefix netmask nexthop • e.g.: • router#conf t • router(config)#ip route 161.53.74.0 255.255.255.0 161.53.75.1

7. exercise 5 (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 0.0.0.0 161.53.75.xx • use ping and traceroute to test • router# ping target-ip-addr • router# trace target-ip-addr

8. exercise 7 (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

9. exercise 7 (2/2)configure passwords • examine the config, note that the passwords are in plaintext • show running • ... • 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 run

10. exercise 8configure syslogging • configure syslogging on the PC: • edit /etc/syslog.conf, add this line • local0.debug /var/log/cisco • daemon syslogd to re-read its configuration file using ps and kill comands • configure the router to do syslogging: • router(config)#logging buffered • router(config)# logging facility local0 • router(config)# logging 169.222.31.42 • some things that cause log messages: • shutting down or bringing up an interface, any configuration change, any debug command

11. exercise 9configure DNS resolver • configure cisco router • use ip name-server command • use ip domain-name comand • use ip domain-list command • use administrative cisco commands • router#ping www.carnet.hr. • router#trace www.carnet.hr. • use other commands: • router# telnet sun1.workshop.carnet.hr.