Network Technologies Lab
Sunday Exercises
gmacri@sunu.rnc.ro
Network technologies lab, Sunday, 24 August ´97
CEENet 97 / track 1 1/11
exercise 1
ping 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
Network technologies lab, Sunday, 24 August ´97
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exercise 2
traceroute 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
Network technologies lab, Sunday, 24 August ´97
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exercise 3
initial 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!)
Network technologies lab, Sunday, 24 August ´97
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exercise 4
configure 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
Network technologies lab, Sunday, 24 August ´97
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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
Network technologies lab, Sunday, 24 August ´97
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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
Network technologies lab, Sunday, 24 August ´97
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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
Network technologies lab, Sunday, 24 August ´97
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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
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exercise 8
configure 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
Network technologies lab, Sunday, 24 August ´97
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exercise 9
configure 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.
Network technologies lab, Sunday, 24 August ´97
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