Why do some web-pages open and some dont?

J

jumbo5

Adept
.......like now i can open rediff,techenclave but cannot open mumbaimirror.com, downloads from rapidshare.com??

While downloading RS links from IDM i get this error.

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I was not able to access certain sites like microsoft.com and driveragent.com but other sites like google.co.in are accessible. It turned out to be a simple default MTU setting = 1500 that windows XP uses. Setting it to 1454 resoved the issue. for this you need to update the registry and reboot the machine, or you can download TCP Optimizer http://www.speedguide.net/files/TCPOptimizer.exe and change the MTU to 1454 or 1492. First try 1454 to see if this works. Then try 1492 to see if that works. Every time you change this you need to reboot the machine.

I think issue happens, when you use router along with dsl modem. In my case,
BSNL Modem is ZXDSL 831AII and router is
Vonage Motorola VT2142. My router is setup to connect to DSL Model using PPPoE connection. I do not use dialer on my desktop.

This sets up persistent connection.

Manual registry modifiaction instructions is also located at Annoyances.org - Can't access some websites while using a shared PPPoE connection
(Can't access some websites while using a shared PPPoE connection ). I am copying the same here if you can not access it.

If you're using Windows' built-in support for Internet Connection Sharing, and your Internet connection is facilitated by PPPoE software (such as Enternet 300) or Windows XP's built-in PPPoE, you may experience this problem. Although any web site will be accessible on the "Host" computer, certain web sites will never load successfully from any of the "client" machines. (If you don't know what "Hosts" or "Clients" are with regard to ICS, read Internet Connection Sharing.) The problem is caused by an incompatible MTU networking setting: Windows' default is 1500, but PPPoE uses 1492 or 1454. Here's how to fix it:

1. Find the IP address of your gateway. If you're using Windows 2000 or XP, run IPCONFIG at a command prompt on the Host computer. If you're using Windows 98 or Me, run WINIPCFG on the Host computer. Either way, you'll get an address that looks like xxx.xxx.xxx.xxx (where the x's represent numbers).
2. Then, go to one of your Client machines, and type the following: PING -f -l 1500 xxx.xxx.xxx.xxx (where xxx.xxx.xxx.xxx is the gateway address you obtained in the first step). You'll probably get an error message indicating that it must be fragmented. If you do, type the following: PING -f -l 1492 xxx.xxx.xxx.xxx If that doesn't work, try this: PING -f -l 1454 xxx.xxx.xxx.xxx
3. The numbers in each of these examples (1500, 1492, 1454) are the MTU values. Continue issuing this command with lower and lower MTU numbers until you get ping responses instead of an error message. The highest MTU value that works is the one you need to be using. If an MTU of 1500 (the first command, above) does not produce an error, then this solution won't work for you.

The next step is to configure all your Client computers to use the new, lower MTU as the default for all Internet communication. Windows 2000 and XP:

1. Run the Registry Editor (REGEDIT.EXE) on one of your "Client" machines.
2. Navigate to HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Services\ Tcpip\ Parameters\ Interfaces.
3. There should be several subkeys under the Interfaces key; most likely, you'll find three. View the contents of each key by clicking, and find the one that corresponds to your primary network adapter; it will be the one with more values than the other two, and will have an IP address value set to something like 192.168.0.x.
4. Once you've found the correct subkey, create a new DWORD value in it (Edit -> New -> DWORD Value), and name the value MTU.
5. Double-click the new value, choose the Decimal option, and type the MTU value determined above.
6. Click Ok when you're done - you'll need to restart Windows for this change take effect.
7. Repeat this for each Client machine.
Click to expand...

Source: Experience: Can't access some websites while using a PPPoE connection on BSNL broadband - Page 2 - India Broadband Forum
 
Not necessarily its always from your side, it can be from backend server side too. sometimes there are ample of requests and apache seems to put them in queue to process however sometimes you press enter again n again apache or any other http process gets it.. it happens very less when there's lot of load and ram is getting fully utilized.

.

however ofcourse start using opendns etc, if its happening a lot then its probably the net you have...if its cable waala kinda then problem is acceptable. If its an ADSL technology, then you surely gotta complaint.
 
@6pack- ya it does,but i guess thats not the prob,its from the isp's side

@salluks- no i dont have peerguardian.

@rahulrulez- u have no idea how bad i've been complaining and scolding these utele guys on the phone and on emails.I guess internet in india especially unlimited packages r punishment in india than a boon.
 
wah , thanks it solved my problem , i had changed my MTU from 1492 to 1500 and wasnt able to open piratebay and h33t.com on my MTNL triband connection even after trying all dns addresses
 
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