LAN but no WAN anymore

Hi
I have a problem accessing internet from my Mac mini after a move. I recently moved and started to use a router provided by my ISP (Thomson TG789vn). Now my Mac mini gets an local IP address but can't get on the Internet. I have turned off wireless and use cable. As a twist I have wired windows vista machines and wired a linux based NAS (QNap) that all get on internet. Also all wireless devices (Windows Vista, MacBook Air, iPhones, iPads etc) work as expected. It must be some routing setting on the Mini but it looks like it uses the correct gateway and DNSes (I also tried google DNS without success). Any ideas?
Best regards
Fredrik

I guess this is useful also but I have no idea
media:~ User$ ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
 options=3<RXCSUM,TXCSUM>
 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
 inet 127.0.0.1 netmask 0xff000000
 inet6 ::1 prefixlen 128
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
 options=2b<RXCSUM,TXCSUM,VLAN_HWTAGGING,TSO4>
 ether c8:2a:14:55:36:7c
 inet6 fe80::ca2a:14ff:fe55:367c%en0 prefixlen 64 scopeid 0x4
 inet 192.168.1.72 netmask 0xffffff00 broadcast 192.168.1.255
 media: autoselect (1000baseT <full-duplex,flow-control>)
 status: active
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
 ether 28:cf:da:03:a0:85
 media: autoselect (<unknown type>)
 status: inactive
fw0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 4078
 lladdr c8:2a:14:ff:fe:f4:50:50
 media: autoselect <full-duplex>
 status: inactive
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
 ether 0a:cf:da:03:a0:85
 media: autoselect
 status: inactive

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