[Ubuntu] Kein Internet

PING google.de (209.85.149.103) 56(84) bytes of data.
From p508E2BB4.dip.t-dialin.net (XX.XXX.XX.XXX) icmp_seq=1 Packet filtered
From p508E2BB4.dip.t-dialin.net (XX.XXX.XX.XXX) icmp_seq=2 Packet filtered
From p508E2BB4.dip.t-dialin.net (XX.XXX.XX.XXX) icmp_seq=3 Packet filtered
From p508E2BB4.dip.t-dialin.net (XX.XXX.XX.XXX) icmp_seq=4 Packet filtered
From p508E2BB4.dip.t-dialin.net (XX.XXX.XX.XXX) icmp_seq=5 Packet filtered

--- google.de ping statistics ---
5 packets transmitted, 0 received, +5 errors, 100% packet loss, time 4007ms

wlan0 IEEE 802.11g ESSID:"XXXX"
Mode:Managed Frequency:2.462 GHz Access Point: XX:XX:XX:XX:XX:XX
Bit Rate=24 Mb/s
RTS thr:2347 B Fragment thr:2346 B
Encryption key:XXXX....XXXX Security mode:restricted
Power Management:off
Link Quality:92/100 Signal level:-37 dBm Noise level:-96 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0