3. OSI Model Vs. TCP/IP Model

6. ICMP: Error, Control, Information.

8. Ports can handle multi-connection.

9. Listening Ports.

11. Decreased by 1 with each router passed.

12. Designed to forbid packets to flow endlessly because of a mis-configured router or so.

14. Private IPs (eg. 192.168.xxx.xxx , 10.xxx.xxx.xxx)

15. Localhost (127.xxx.xxx.xxx)

16. Subnets & netmask.

17. Network & Broadcast IP.

19. Natting.

20. Port-Forwarding.

21. Firewalling.

23. Switch Vs. Router

24. Access Points, are they Switches or Hubs?

26. DHCP

27. Part II: Configure wired NIC

29. Ifup & ifdown

33. /etc/resolv.conf

34. /etc/hosts

36. Or # File: ifcfg-eth0 DEVICE=eth0 IPADDR=192.168.1.100 NETMASK=255.255.255.0 BOOTPROTO=static ONBOOT=yes # The following settings are optional BROADCAST=192.168.1.255 NETWORK=192.168.1.0 # File: ifcfg-eth0 DEVICE=eth0 BOOTPROTO=dhcp ONBOOT=yes

38. Static routes can be added per NIC: NETWORKING=yes HOSTNAME=bigboy GATEWAY=192.168.1.1 # File /etc/sysconfig/network-scripts/route-wlan0 # 10.0.0.0/8 via 192.168.1.254

41. /etc/hostname auto eth1:1 iface eth1:1 inet static address 216.10.119.239 netmask 255.255.255.224 # The secondary network interface auto eth0 iface eth0 inet dhcp

42. Part III: Configuring wireless

44. ls /sys/classes/net/eth1 (look for “wireless”)

45. iwlist eth1 scan

46. Ifconfig eth1 0.0.0.0 up

47. iwconfig eth1 mode Managed

48. iwconfig eth1 channel 6

49. Iwconfig eth1 key restricted s:MyKey # for WEP

51. Killall wpa_supplicant

52. wpa_passphrase linksys mysecret > /etc/wpa_supplicant.conf

53. Iwconfig eth1 mode Managed

54. Iwconfig eth1 essid linksys

55. Iwconfig eth1 channel 11

56. wpa_supplicant -i eth1 -c /etc/wpa_supplicant.conf -d -D wext &

58. dhclient eth1

60. linuxac.org Magazine Jan, 2008