Cannot route web pages, but can ping

I have an interesting problem where we can see any websites we've previously visited, but can't see any new ones.  But it's not a DNS issue, because we can ping the new destination.

This affects everybody on the network. It's a 20 user network, DNS server is local server 192,168.0.1 followed by Google Public DNS  If we go onto, it comes up and we can browse.  If we go to, we get nothing. If you ping, you get the right IP address.

Network gateway is a Draytek Vigor 2925, talking to a Vigor 130 VDSL modem.  It uses PPPoE to connect to the Internet.  Does anybody have any idea what it could be that's causing this?
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Any firewall in the network? or proxy?

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If you put in the ip address of a web site instead of the url, can you reach the web site?

For example, instead of use
Jody LemoineNetwork ArchitectCommented:
With a PPPoE, connection, you should make sure that your MTU and MSS are set correctly or you will run into problems with any site that uses HTTPS. MTU should be 1492 and MSS should be 1452.
TechdivisionAuthor Commented:
After all of that fussing, it was actually the managed switch that was to blame.  I messed about endlessly with the router to no avail, then came in at the weekend and plugged the plug out of the managed switch (which killed off all the PoE phones), but then everything came back online.  

Thanks for your help everyone.
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