Why some sites like hotmail.com and yahoo.com are not opening when i use PPPoA

I am unable to login into yahoomail and hotmail sites. When i called to my ISP. They told that they changed my ADSl link from ATM DSLAM to IP DSLAM and asked me to change the protocol from PPPoA to PPPoE. But why i am able to browse other sites with PPPoA where as these sites need PPPoE. How it works. If it is protocol mismatch all the sites should not open but why only particular sites having this problem. What happens if i use PPPoE when i connected to ATM DSLAM.


Regards
Uma Mahesh
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dumamaheshAsked:
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pseudocyberCommented:
Can you log into any site that uses SSL? Do you have any firewalls running?
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td_milesCommented:
possibly an MTU issue, see other question:

http://www.experts-exchange.com/Security/Q_20965634.html
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dumamaheshAuthor Commented:
I donot have any firewall my PC is directly connected to the DSL modem. And no SSL site is logging
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dumamaheshAuthor Commented:
I accept that it may be an MTU issue. But i wish to know how it is related to PPPoA and PPPoE.
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td_milesCommented:
There are plenty of sites that explain it better than I could:

http://alive.znep.com/~marcs/mtu/index.html
http://www.dslreports.com/faq/tweaks/4.%20MTU
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td_milesCommented:
I don't really mind, I'm here for the glory, not the points ;)
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