iPhone Forums - View Single Post - Iphone not connecting to wi-fi (already read the other threads)

Hecubus · 07-25-2007, 06:10 PM

Originally Posted by Tinman

Well you need to verify it is a DNS issue. Can you get to Google using the above IP address?

Either way the DNS workaround is merely overriding DHCP-supplied DNS IPs with either your ISP DNS, or public DNS IPs like these:
208.67.222.222
208.67.220.220

In my case, and others I have read about, the DNS IP supplied by the router via DHCP was the router's IP (i.e., it will match gateway IP). While this should work, in some cases it doesn't work right with the iPhone, hence the DNS override workaround.

But again, I wouldn't try that without first testing Google via IP.

Okay, thanks for this information. I was able to get to google with the above address, but I'm not sure what I need to do now. I have a Belkin Wireless G router. Is there something I need to do within the router, or within my iphone?

Thanks much.

EDIT: I actually tried what you had written in another forum post...

1.) From the main screen go to Settings, and from Settings go to Wi-Fi.

2.) The Wi-Fi network you are currently connected to will have a blue check next to it, over on the left. For that same WiFi network, tap the blue circle (with ">" inside) to get to more options.

3.) Look at both the Router and DNS IP addresses. If they are the same, you might have a DNS issue, and continue on to step 4. If they are not the same you probably don't have a DNS issue, so only continue on if you have no other options.

4.) Tap inside the DNS field, and the cursor will be positioned at the end. Delete everything there. Enter the following instead:
208.67.222.222, 208.67.220.220

5.) Tap Wi-Fi Networks to go back to exit that screen.

6.) Press the Menu button to go back to the main screen and try Safari again.

...and it worked perfectly (at least for the time being--I suspect it may crap out on me again, but this has been the best solution so far.)

The odd thing was, my router and dns IP number were not the same, and while I don't understand the the how and the why as to my wifi working suddenly after implementing the above suggestion, I guess I don't get why you said "Look at both the Router and DNS IP addresses. If they are the same, you might have a DNS issue." Of course, you said, "might" but I'm just curious since I know next to nothing on the subject. When would it be a dns issue if the numbers were different, such as mine were? Just trying to learn more.

Regardless, your teachings have worked. Thank you, sir.

07-25-2007, 06:10 PM	#7 (permalink)
Hecubus Join Date: Jul 2007 Posts: 117 Thanks: 0 Thanked 0 Times in 0 Posts	Originally Posted by Tinman Well you need to verify it is a DNS issue. Can you get to Google using the above IP address? Either way the DNS workaround is merely overriding DHCP-supplied DNS IPs with either your ISP DNS, or public DNS IPs like these: 208.67.222.222 208.67.220.220 In my case, and others I have read about, the DNS IP supplied by the router via DHCP was the router's IP (i.e., it will match gateway IP). While this should work, in some cases it doesn't work right with the iPhone, hence the DNS override workaround. But again, I wouldn't try that without first testing Google via IP. Okay, thanks for this information. I was able to get to google with the above address, but I'm not sure what I need to do now. I have a Belkin Wireless G router. Is there something I need to do within the router, or within my iphone? Thanks much. EDIT: I actually tried what you had written in another forum post... 1.) From the main screen go to Settings, and from Settings go to Wi-Fi. 2.) The Wi-Fi network you are currently connected to will have a blue check next to it, over on the left. For that same WiFi network, tap the blue circle (with ">" inside) to get to more options. 3.) Look at both the Router and DNS IP addresses. If they are the same, you might have a DNS issue, and continue on to step 4. If they are not the same you probably don't have a DNS issue, so only continue on if you have no other options. 4.) Tap inside the DNS field, and the cursor will be positioned at the end. Delete everything there. Enter the following instead: 208.67.222.222, 208.67.220.220 5.) Tap Wi-Fi Networks to go back to exit that screen. 6.) Press the Menu button to go back to the main screen and try Safari again. ...and it worked perfectly (at least for the time being--I suspect it may crap out on me again, but this has been the best solution so far.) The odd thing was, my router and dns IP number were not the same, and while I don't understand the the how and the why as to my wifi working suddenly after implementing the above suggestion, I guess I don't get why you said "Look at both the Router and DNS IP addresses. If they are the same, you might have a DNS issue." Of course, you said, "might" but I'm just curious since I know next to nothing on the subject. When would it be a dns issue if the numbers were different, such as mine were? Just trying to learn more. Regardless, your teachings have worked. Thank you, sir. Last edited by Hecubus; 07-25-2007 at 06:48 PM..