Fedora 12 - Network works only for a few seconds

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http://forums.fedoraforum.org – This is probably the most weird and frustrating problem ever happened to me. I have a Fedora 12 box, which works absolutely fine in a fastweb wlan. However, if I connect to another wlan where I need to link to a wireless access point cabled to the ISP modem/router, networkmanager shows the connection is ok, but... 1) I only can browse internet (es:www.google.it) for a few seconds after the connection is established, thanfirefox goes "Impossible to reach the server" 2) the same behaviour is confirmed by ping Code: [Adriano@localhost ~]$ ping www.google.it PING www.l.google.com ( 56(84) bytes of data. 64 bytes from mu-in-f106.1e100.net ( icmp_seq=1 ttl=49 time=138 ms 64 bytes from mu-in-f106.1e100.net ( icmp_seq=2 ttl=49 time=127 ms 64 bytes from mu-in-f106.1e100.net ( icmp_seq=3 ttl=49 time=127 ms 64 bytes from mu-in-f106.1e100.net ( icmp_seq=4 ttl=49 time=118 ms 64 bytes from mu-in-f106.1e100.net ( icmp_seq=5 ttl=49 time=114 ms 64 bytes from mu-in-f106.1e100.net ( icmp_seq=6 ttl=49 time=117 ms 64 bytes from mu-in-f106.1e100.net ( icmp_seq=7 ttl=49 time=128 ms ^C --- www.l.google.com ping statistics --- 11 packets transmitted, 7 received, 36% packet loss, time 10994ms rtt min/avg/max/mdev = 114.546/124.730/138.994/7.835 ms EDIT: There is a win box in the same net that is working fine. I see in the router config that ARP for the working machine is "complete", while for the Fedora one is "incomplete" Nothing changes configuring a static or dynamic IP address for the Fedora box I had a previous Fedora 11 installation on the same machine that now gives troubles, and it worked fine. But I can't tell if it's a software problem because my ISP seems to have telnet-ed the router, changing it's firmware (and maybe it's config). Shame on they. What can possibly cause this behaviour? Thanks in advance (HowTos)