I cannot access 192.168.1.1 in Ubuntu 14.04.I use wireless router TP-LINK TD-W8901G.It worked on windows but it doesn't work on Ubuntu.Any ideas what should I do?

The output of ifconfig is:

eth0      Link encap:Ethernet  HWaddr 60:a4:4c:4e:94:ab  

      inet6 addr: fe80::62a4:4cff:fe4e:94ab/64 Scope:Link

      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

      RX packets:47087 errors:0 dropped:0 overruns:0 frame:0

      TX packets:49475 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:1000 

      RX bytes:35977992 (35.9 MB)  TX bytes:7791380 (7.7 MB)



lo        Link encap:Local Loopback  

      inet addr:127.0.0.1  Mask:255.0.0.0

      inet6 addr: ::1/128 Scope:Host

      UP LOOPBACK RUNNING  MTU:65536  Metric:1

      RX packets:9663 errors:0 dropped:0 overruns:0 frame:0

      TX packets:9663 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:0 

      RX bytes:1065746 (1.0 MB)  TX bytes:1065746 (1.0 MB)



ppp0      Link encap:Point-to-Point Protocol  

      inet addr:122.168.19.182  P-t-P:122.168.4.1  Mask:255.255.255.255

      UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1

      RX packets:3493 errors:0 dropped:0 overruns:0 frame:0

      TX packets:4238 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:3 

      RX bytes:911258 (911.2 KB)  TX bytes:742138 (742.1 KB)

The output of ping 192.168.1.1 is :

PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.

From 125.21.0.109 icmp_seq=1 Destination Net Unreachable

From 125.21.0.109 icmp_seq=2 Destination Net Unreachable

From 125.21.0.109 icmp_seq=3 Destination Net Unreachable

From 125.21.0.109 icmp_seq=4 Destination Net Unreachable

Then it went to infinite loop.I had to interrupt it.