A very weird problem with Mac and internet

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Anybody who has a clue about my problem?

iMac 24", Mac OSX 10.4.9, Netgear ADSL Wireless Router DG834G. Since a couple of days back I can't get anything that has to do with webhotel, not a single site from this webhotel. If I switch to a ADSL modem Zyxel it works but not from my Netgear modem-router. I have made "reset to factory settings", also upgraded firmware. Since it works with an another ADSL modem, what can have happened to my Netgear box?

Anybody who has a clue?
 
How come my IP number is blocked when my Mac was shut off this day? Can you use false IP numbers?

My ISP is a bit special. If my ISP detects the same Mac(!) number I they try to give me the same IP number if it's free. If I change from my wireless Netgear box to an ugly Zyxel ADSL modem I'll get a different IP number so as long as my webhotel manager removes the blocking I can't use my wireless thing 😡 to acessing my domain.
 
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