Some sites are not reachable (for me) sometimes, then they are again

I have a DSL connection at home and a Netgear WLAN router connected to it.
Since I changed to Leopard some sites like google/Apple/yahoo and many others are not accessible on a random base.
Sometimes I just have to change from Sarari to Firefox and everything´s fine. Sometimes vice versa, Sometimes my MacBook Pro keeps telling me that I have no Internet connection although all other sites open perfectly well in the very moment.. Sometimes I just have to wait for 10 minutes (sometimes just 1) and I get access to this site.
There is absolutely no logic visible for me. The same happens with my wife´s MacBook.
When I am connecting through my Vodafone 3G UMTS card no problems what so ever. When I am at any other network - again no problem.
So what do I have to do with this Netgear Router or this ADSL modem? Any clue? I did not change anything for years because I had no reason.
The same - by the way - happens now and then with my mail server. System tells me that the server is not accessible at the moment which is not true of course. It´s just that my Mac can´t come through for any reason.
Help is VERY much apreciated - thanks

Yes, this follows an upgrade to Leopard. But I don´t know how to do what you tell me to do.
When I go to Network (I am connected to my router via Ethernet cable) I see the following:
Configuration: DHCP
IP-Adress: xxx.xxx.x.x
Subnet Mask: 255.255.255.0
Router: xxx.xxx.x.x
DNS-Server: the same value as the router but greyed out and not accessible
Search Domain: lan but greyed out as well
So what to change now? May be on the router itself?

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