Windows Vista Security: Praxisorientierte Sicherheit für Profis

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Chapter 14: Setting Up Your Network

Fixing Network Problems

TCP/IP networking has many different facets, and additional protocols that ride on

top of it. While it is the single most prolific technology in use today, there are inher-

ent problems with some implementations. Use Table 14-11 to help diagnose com-

mon problems with network connectivity or protocol issues.

Table 14-11. Troubleshooting matrix

Problem Resolution

No IP Address Check DHCP scope on the router or server.

Input a static IP address.

Cannot Ping Machine Ping 127.0.0.1.

Ping <Host Name>.

Ping

<Default Gateway>.

Cannot Ping 127.0.0.1 Verify that the TCP/IP protocols are enabled on the adapter.

Verify that the adapter is enabled in Device Manager.

Cannot Ping Default Gateway Verify that the gateway has network connectivity.

Check the cables connecting your computer to the network device.

Reset the network device by powering it off and then powering it on.

Contact your ISP.

Replace the network device.

Cannot Reach Internet Check gateway connectivity using

TRACERT <IP Destination>.

Verify DNS resolution using

NSLookup.

Input DNS server addresses as part of the network device DHCP configuration.

Input DNS server addresses in the TCP/IP properties of the network adapter.

No Network Connectivity Check the cable connecting the network adapter to the network.

Check Link/Act status on the adapter.

Update the network adapter driver.

Flash BIOS on motherboard (integrated adapters only).

Move the network adapter to a different slot on the motherboard.

Replace the network adapter.

Only Send or Receive Packets Reseat the network cable.

Replace the network cable.