Issue opening websites, Facebook, MSN, Microsoft - IE9,FF10,Chrome

Seems some issue with the bridged mode connection. It seems if I directly enable PPPOE connection on my Modem it works fine. If I connect it via DIR300 it makes it a bridged mode connection on the modem. There seems to be the problem. I removed all connection options on the modem and kept only 0/35 PPPOE Bridged mode connection on it with NAT and QoS enabled. Yet same issue.
 

My Computer My Computer

At a glance

Windows 7 Ultimate x64AMD Phenom II X48GB DDR3ATI Radeon 1GB DDR3 1.4 GHz
Computer Manufacturer/Model Number
Self Assembled
OS
Windows 7 Ultimate x64
CPU
AMD Phenom II X4
Motherboard
Asus M4A88T-M
Memory
8GB DDR3
Graphics Card(s)
ATI Radeon 1GB DDR3 1.4 GHz
Sound Card
VIA HD Audio
Monitor(s) Displays
Benq 17inch LCD
Hard Drives
Seagate SATA
Seagata IDE
WD IDE
Try clearing your browser, history, cookies, cache, etc.
 

My Computer My Computer

At a glance

Windows 7 Ultimate SP1 - 64 BitIntel Core i5 2500k2x4GB DDR3 1333HzAti Radeon 6770
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Novatech iRush Pro
OS
Windows 7 Ultimate SP1 - 64 Bit
CPU
Intel Core i5 2500k
Motherboard
Foxconn H67M-S/H67M-V/H67
Memory
2x4GB DDR3 1333Hz
Graphics Card(s)
Ati Radeon 6770
Sound Card
None
Monitor(s) Displays
Samsung S22B150
Screen Resolution
1920x1080
Hard Drives
2x500GB
PSU
500W
Cooling
Fan
Keyboard
HP KU0316
Mouse
Wireless Logitech M185
Internet Speed
20MB/s
Antivirus
Avast Free
Browser
Google Chrome
Other Info
Logitech M185 Mouse
KU-M316 Keyboard
I am having exactly the same problem. I am not able to open microsoft site, hotmail, linkedin (some pages) when i connect my Laptops to Internet through my Asus RT-N56U. However, i am able to connect all the sites when i connect these laptops through my mobile or directly through modem.

The problem is router or communication between router and modem. I have done all possible troubleshooting mentioned in this thread, but no luck...

Please help
 

My Computer My Computer

At a glance

Vista
OS
Vista
Found the solution

It seems the problem is specific to the ISP (BSNL, India).

Changing the setting in router (pppoe mode) for MTU from 1492 to 1452 done the trick...
 

My Computer My Computer

At a glance

Vista
OS
Vista
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