CNT-2311-Chapter 8 Notes

Ifup and ifdown command *(pg. 408)

-The ifup command bring the interface up

-The ifdown command bring the interface down

Example of ifup/ifdown *(pag.408)

“ifup eth0”

–bring up the interface eth0“ifdown eth0”.

–bring down the interface eth0- useful to quickly to take down a interface or

bring it up, because you do not need to remember all the detail of the IP

address, route and so on.

Hostnames *(pg. 409)

There are 2 way to configure the hostname

-On DNS

-On you local computer

Domain Name System (DNS) *(pg. 409)

- “is a distributed database computers that converts between IP addresses and

hostnames”.

- The DNS server just sit and listen for other computers on the network to send

request.

- The server then send the request out to other DNS server if it cannot find it

in it cache.

- If the server found what the request is asking for then it will send a request

back to the computer telling it where to go.

Diagnosing Network Connections *(pg. 412)

- There are a few command that will help diagnose a problem.

- They are ping, traceroute, tracepath, netstat, and tcpdump.

Ping command *(pg. 412)

- The ping command is a very basic network test, which send ICMP packet to the

system you name, hostnames, or ip address and wait for a reply

- In Linux it send the packet every second until you press Ctrl+C key to stop

the stroke.

Traceroute command *(pg. 412-413)

- This command will sends a series of three test packets to each computer

between your system and a specified target system

Tracepath command *(pg. 413)

- This command is a lot similar to traceroute