能上网ping不通网关

C:\Documents and Settings\Administrator>ping 127.0.0.1
Pinging 127.0.0.1 with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Ping statistics for 127.0.0.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\Administrator>ping 192.168.1.100
Pinging 192.168.1.100 with 32 bytes of data:
Reply from 192.168.1.100: bytes=32 time<1ms TTL=128
Reply from 192.168.1.100: bytes=32 time<1ms TTL=128
Reply from 192.168.1.100: bytes=32 time<1ms TTL=128
Reply from 192.168.1.100: bytes=32 time<1ms TTL=128
Ping statistics for 192.168.1.100:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\Administrator>ping www.baidu.com
Pinging www.a.shifen.com [202.108.22.5] with 32 bytes of data:
Reply from 202.108.22.5: bytes=32 time=22ms TTL=56
Reply from 202.108.22.5: bytes=32 time=23ms TTL=56
Reply from 202.108.22.5: bytes=32 time=28ms TTL=56
Reply from 202.108.22.5: bytes=32 time=21ms TTL=56
Ping statistics for 202.108.22.5:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 21ms, Maximum = 28ms, Average = 23ms
C:\Documents and Settings\Administrator>ping 218.104.111.114
Pinging 218.104.111.114 with 32 bytes of data:
Reply from 218.104.111.114: bytes=32 time=6ms TTL=250
Reply from 218.104.111.114: bytes=32 time=3ms TTL=250
Reply from 218.104.111.114: bytes=32 time=3ms TTL=250
Reply from 218.104.111.114: bytes=32 time=3ms TTL=250
Ping statistics for 218.104.111.114:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 3ms, Maximum = 6ms, Average = 3ms
C:\Documents and Settings\Administrator>ping 192.168.1.1
Pinging 192.168.1.1 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
C:\Documents and Settings\Administrator>ping 192.168.1.1
Pinging 192.168.1.1 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.1.1:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), 能上网ping不通网关 上不了飞信 同一局域网其他用户可以ping通网关. 请问是为什么？