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Network Management

Master the essentials of network management with our in-depth guide covering configuration techniques, key networking commands, and important network files. Learn how to use command-line tools like `ifconfig`, `route`, `ping`, and `nmap` for efficient network management. Discover how to build your routing table and configure network interfaces effectively. With clear examples and insights into files such as `/etc/hosts` and `/etc/resolv.conf`, this guide is essential for anyone looking to enhance their networking skills.

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Network Management

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  1. Network Management 1

  2. Configuring your Networking • It can be done in two ways: • Uses command to change current setting. • Edit some different files. 2

  3. Network Commands • ifconfig • route • netstate • ping • traceroute • tcpdump • nmap 3

  4. ifconfig • Configure network interface 4

  5. ifconfig (cont.) • Create alias • Ifconfig eth0:0 192.168.1.1 • Change IP address • Ifconfig eth0 192.168.1.2 • Change the netmask • Ifconfig eth0 netmask 255.255.255.0 • Change the broadcast • Ifconfig eth0 broadcast 192.168.1.255 • Take interface down • Ifconfig eth0 down • Bring interface up • Ifconfig eth0 up • No argument • Display the status of active interfaces 5

  6. route • Build routing table • Route: display existing route • Samples: • route add default gw 192.168.1.1 • route add –net 192.168.1.0 netmask 255.255.255.0 dev eth0 • route add –host 192.168.1.1 gw 192.168.1.100 6

  7. Other Commands • netstate • Display the status of network • ping • Send ICMP ECHO-REQUEST to network host • traceroute • Print the route packets take to network host • tcpdump • Dump traffic on a network • nmap • Port scanning 7

  8. Network Files • /etc/hosts • It is a map of IP to hostname. • /etc/services • It maps port numbers to services (TCP and UDP). • /etc/resolv.conf • It is used by DNS. • /etc/host.conf • It lists the order in which your machine will search for hostname resolution. • /etc/HOSTNAME • hostname • /etc/sysconfig/network 8

  9. Question? 9

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