Network issues - ethernet + wifi on aspire 5749

Hello, I've juste install a Debian Squeeze on my new laptop Acer Aspire 5749. My problems : * ethernet : I am able to connect to the internet via ethernet during only a few minuts; after that, the network is down, and I have to reboot. I'm connecting behind a routeur, and I can not even ping the routeur (Host unreachable). * wifi : not able to enable it. I've followed instrcutions here : wiki.debian.org/iwlagn but it does'nt work (iwconfig returns : "x no wireless extension" for x in "lo","eth0","pan0"). Do you have solutions ? Here is my lspci : Code: 00:00.0 Host bridge: Intel Corporation Sandy Bridge DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation Sandy Bridge Integrated Graphics Controller (rev 09) 00:16.0 Communication controller: Intel Corporation Cougar Point HECI Controller #1 (rev 04) 00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 05) 00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 1 (rev b5) 00:1c.5 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 6 (rev b5) 00:1d.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #1 (rev 05) 00:1f.0 ISA bridge: Intel Corporation Cougar Point LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation Cougar Point 6 port SATA AHCI Controller (rev 05) 00:1f.3 SMBus: Intel Corporation Cougar Point SMBus Controller (rev 05) 02:00.0 Ethernet controller: Atheros Communications AR8152 v2.0 Fast Ethernet (rev c1) 07:00.0 Network controller: Intel Corporation WiFi 100 Series Thanks,

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