When your computer fails to contact a DHCP server, the default alternative addressing method, "Automatic Private IP Addressing" is used. APIPA only assigns an IP in the 169.254. range and a subnet mask of 255.255.0.0. It does not assign a gateway or DNS servers. Therefore you cannot access the Internet. Open command prompt and type, ping localhost, or ping 127.0.0.1 and hit enter. The results should show 4 packets sent and 4 packets received. If this is not the case, reset TCP/IP by entering, netsh int ip reset resetlog.txt.
Hi. After having trouble connecting wirelessly to the internet with my (Dell Inspiron 6400) I tried getting into the router to look at the settings. I couldn't so tried by plugging in using an ethernet cable as that always works. However, this time it didn't and after a while I wondered if the problem might be with my laptop. I then plugged in a different laptop and that was OK.
When I subsequently ran cmd ipconfig on my Dell there was no DNS Suffix, an IP Address that started 168 when I thought it should be 192.168.1.2, a Subnet mask that looked like the one that was there originally (and what is a Subnet Mask anyway?) and, most importantly, no Default Gateway address at all, which is, I assume, why the relevant ethernet port indicator light didn't come on when I plugged in.
Someone told me about the /release command so I did exactly that and now have 0.0.0.0 in both the IP address and Subnet Mask but still nothing at all for the other two. The laptop that's working OK doesn't show a DNS suffix either so I assume it doesn't matter, but how do I get the right Addresses back into my Dell's system?