A bit stuck on this one, limping along at the moment and would love some help on this issue.
I have a D-Link 2740B Wireless Broadband router, which in general I'm happy with except for the fact that I can't seem to connect to Internet with it. Not a great situation.
I can sync, connect to and browse the Internet via an older router so all "seems" good on the line/ISP side. Wireless went on this router so bought the D-Link. However if I connect the new router to same socket, same settings, I can sync, ping urls and IP addresses but cannot browse web pages.
Google is ok and one or two others but 99.9% will not open in a browser although one can ping the URL, so DNS resolves.
If I change from PPPoA to PPPoE without rebooting router, and adding my own dns settings to my PC (say opendns), I can browse and connect to the Internet as per normal with the new router.
So what I've deduced from various forum posts is that this may initially be a MTU issue made worse by some sort of DNS issue when playing around with the router/adsl settings?
Help!
Would love some input on any test's I could run to nail down the problem and hopefully solve it.
The cause of this is incorrect network adapter Maximum Transmission Unit or MTU setting. You need to change the MTU setting on the computer using DRTCP.
If you can not access the site you will have to obtain the programme from a friend or at work. Once you have the programme double click on it to run.
First make a note of the current settings.
Fill in the programme settings as per the web pages above - SAVE - EXIT AND REBOOT COMPUTER.
If you can not access the pages to see settings then they are as follows:
TCP Receive Window = First try 55600 with 1430 below. Then try 51048 with 1458. (RWIN)
Window Scaling = Yes
Time Stamping = No
Selective Acks = Yes
Dial Up (RAS) MTU = First try 1430 if no luck try 1458
Path MTU discovery = Yes
Black hole detection = default
MAx duplicate Acks = 2
TTL = 64
If you are using a USB modem put the MTU value in Dial Up (RAS) MTU
If you are using a network card to connect to router put the MTU value as follows. Select your Ethernet Card (NIC) under Adapter Settings and enter there.
If you are using a wireless connection select your wireless adapter under Adapter Settings and enter there.
Make sure that your router does NOT have a lower MTU than the PC.
Once you can access webpages go to pages above to calculate your best RWIN depending on the speed of your connection. You can also optimise the settings at: http://www.dslreports.com/tweaks
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