我用Modem上网，连接好之后，用/sbin/ifconfig:
[work@localhost work]$ /sbin/ifconfig
lo Link encap
ocal Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:10 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:840 (840.0 b) TX bytes:840 (840.0 b)
ppp0 Link encap
oint-to-Point Protocol
inet addr:218.97.202.20 P-t-P:192.168.0.33 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:3070 errors:1 dropped:0 overruns:0 frame:0
TX packets:3676 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:2072605 (1.9 Mb) TX bytes:476762 (465.5 Kb)
开始我试着ping同一网络下其它机器：
[work@localhost work]$ ping -b 218.97.202.255 -c 5
PING 218.97.202.255 (218.97.202.255) 56(84) bytes of data.
--- 218.97.202.255 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4010ms
没有回应，我试着ping 知名网站：
[work@localhost work]$ ping -c 5
PING pagegrp1.sohu.com (61.135.132.65) 56(84) bytes of data.
--- pagegrp1.sohu.com ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4010ms
也没有回应，我用host命令查找
[work@localhost work]$ host
is an alias for pagegrp1.sohu.com.
pagegrp1.sohu.com has address 61.135.150.65
pagegrp1.sohu.com has address 61.135.150.67
pagegrp1.sohu.com has address 61.135.150.101
pagegrp1.sohu.com has address 61.135.150.113
pagegrp1.sohu.com has address 61.135.150.121
pagegrp1.sohu.com has address 61.135.150.145
pagegrp1.sohu.com has address 61.135.131.91
pagegrp1.sohu.com has address 61.135.131.180
pagegrp1.sohu.com has address 61.135.131.182
pagegrp1.sohu.com has address 61.135.131.183
pagegrp1.sohu.com has address 61.135.132.65
pagegrp1.sohu.com has address 61.135.132.80
pagegrp1.sohu.com has address 61.135.132.172
pagegrp1.sohu.com has address 61.135.132.173
pagegrp1.sohu.com has address 61.135.132.176
pagegrp1.sohu.com has address 61.135.145.47
均有结果，请问斑竹为什么ping不到？
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ping本机和route没有问题了，但ping知名网站依然没有回应，我试着用traceroute来追踪：
[work@localhost work]$ host
has address 60.191.37.12
[work@localhost work]$ traceroute 60.191.37.12
traceroute to 60.191.37.12 (60.191.37.12), 30 hops max, 38 byte packets
1 192.168.0.5 (192.168.0.5) 121.722 ms 123.546 ms 117.711 ms
2 192.168.0.254 (192.168.0.254) 125.686 ms 115.599 ms 121.757 ms
3 218.97.192.69 (218.97.192.69) 124.042 ms 123.886 ms 119.942 ms
4 203.90.132.221 (203.90.132.221) 123.934 ms 124.006 ms 107.830 ms
5 203.90.132.253 (203.90.132.253) 127.945 ms 111.913 ms 111.923 ms
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
只能进行部分追踪，这是为什么？
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