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This guide provides a comprehensive set of exercises aimed at mastering network configuration and troubleshooting using the ping and traceroute commands on Windows 95 and Debian Linux, along with initial Cisco router setup. It covers connecting to a Cisco router, configuring Ethernet interfaces, setting static routes, managing passwords, enabling syslogging, and configuring a DNS resolver. Each exercise is designed to build practical skills for networking professionals and students. Follow these step-by-step instructions for effective hands-on learning.
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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
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
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!)
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
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
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
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
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
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
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.
