My WiFi pick up the signal, but I can't do anything with internet.

I was browser the web the other day, and all the sudden everything stop loading, and after that I can't go to any site. any more. but as I check of the log, I doesn't see any problem. and I can tell the system do pick up the signal, but I just can't go online.
here is what I have check:
ioky@Varius:~$ sudo iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
eth1 IEEE 802.11b ESSID:"linksys" Nickname:"ipw2100"
Mode:Managed Frequency:2.437 GHz Access Point: 00:0C:41:84:3B:BE
Bit Rate=2 Mb/s Tx-Power:16 dBm
Retry short limit:7 RTS thr: off Fragment thr: off
Encryption key: off
Power Management: off
Link Quality=72/100 Signal level=-80 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:3 Missed beacon:0
eth1 Scan completed :
Cell 01 - Address: 00:12:0E:0F:50:02
ESSID:"05B408577194"
Protocol:IEEE 802.11bg
Mode:Master
Frequency:2.437 GHz (Channel 6)
Encryption key: off
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s; 22 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
Quality:53 Signal level:0 Noise level:0
Extra: Last beacon: 216ms ago
Cell 02 - Address: 00:13:10:1B:71:54
ESSID:"Chidori"
Protocol:IEEE 802.11bg
Mode:Master
Frequency:2.437 GHz (Channel 6)
Encryption key: on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
48 Mb/s; 54 Mb/s
Quality:37 Signal level:0 Noise level:0
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (1) : TKIP
Authentication Suites (1) : PSK
Extra: Last beacon: 212ms ago
Cell 03 - Address: 00:13:10:73:95:5A
ESSID:"ptak"
Protocol:IEEE 802.11bg
Mode:Master
Frequency:2.462 GHz (Channel 11)
Encryption key: on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
48 Mb/s; 54 Mb/s
Quality:31 Signal level:0 Noise level:0
Extra: Last beacon: 0ms ago
Cell 04 - Address: 00:0C:41:84:3B:BE
ESSID:"linksys"
Protocol:IEEE 802.11b
Mode:Master
Frequency:2.437 GHz (Channel 6)
Encryption key: off
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
Quality:31 Signal level:0 Noise level:0
Extra: Last beacon: 208ms ago
ioky@Varius:~$ sudo dhclient eth1
Internet Systems Consortium DHCP Client V3.0.6
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
Listening on LPF/eth1/00:0c:f1:3a:b5:02
Sending on LPF/eth1/00:0c:f1:3a:b5:02
Sending on Socket/fallback
DHCPREQUEST of 192.168.1.104 on eth1 to 255.255.255.255 port 67
DHCPACK of 192.168.1.104 from 192.168.1.1
bound to 192.168.1.104 -- renewal in 33768 seconds.
ioky@Varius:~$ sudo ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:0c:f1:3a:b5:02
inet addr:192.168.1.104 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::20c:f1ff:fe3a:b502/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:145 errors:0 dropped:0 overruns:0 frame:0
TX packets:175 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:16023 (15.6 KB) TX bytes:12958 (12.6 KB)
Interrupt:11 Base address:0x2000 Memory:cfffe000-cfffefff
ioky@Varius:~ ping google.com
ping: unknown host google.com
I have no idea what is going. could anyone give me a hand?
Thanks

Can you ping one of google's IP addresses? for ex. 72.14.207.99 If you can you may want to check /etc/resolv.conf and see if your DNS IP is entered correctly.

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