可以上网，但无法ping通除自己IP以外任何IP

[恒河沙数1]

我是在校生，学校分配给每栋楼不同IP段。我所处的楼的IP段是
10.1.144.*和10.1.145.*以及10.1.146.*
我的网络设置如下
IP地址：10.1.145.3
子网掩码：255.255.252.0
网关：10.1.144.1
主DNS：202.113.32.6

我能够正常上外网，通过一个Dr.com客户端。

但是ping不通外网的ip，如我在终端输入

代码： 全选

$ ping -c 10 119.75.217.56

显示

PING 119.75.217.56 (119.75.217.56) 56(84) bytes of data.

--- 119.75.217.56 ping statistics ---
10 packets transmitted, 0 received, 100% packet loss, time 9071ms

我可以ping通自己的ip，如我在终端输入

代码： 全选

$ ping -c 10 10.1.145.3

显示

PING 10.1.145.3 (10.1.145.3) 56(84) bytes of data.
64 bytes from 10.1.145.3: icmp_req=1 ttl=64 time=0.043 ms
64 bytes from 10.1.145.3: icmp_req=2 ttl=64 time=0.039 ms
64 bytes from 10.1.145.3: icmp_req=3 ttl=64 time=0.038 ms
64 bytes from 10.1.145.3: icmp_req=4 ttl=64 time=0.038 ms
64 bytes from 10.1.145.3: icmp_req=5 ttl=64 time=0.047 ms
64 bytes from 10.1.145.3: icmp_req=6 ttl=64 time=0.042 ms
64 bytes from 10.1.145.3: icmp_req=7 ttl=64 time=0.044 ms
64 bytes from 10.1.145.3: icmp_req=8 ttl=64 time=0.045 ms
64 bytes from 10.1.145.3: icmp_req=9 ttl=64 time=0.038 ms
64 bytes from 10.1.145.3: icmp_req=10 ttl=64 time=0.045 ms

--- 10.1.145.3 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 8997ms
rtt min/avg/max/mdev = 0.038/0.041/0.047/0.009 ms

但是我没有办法ping通局域网内的其他ip，如我在终端输入

代码： 全选

$ ping -c 10 10.1.145.51

显示如下

PING 10.1.145.51 (10.1.145.51) 56(84) bytes of data.
From 10.1.145.3 icmp_seq=1 Destination Host Unreachable
From 10.1.145.3 icmp_seq=2 Destination Host Unreachable
From 10.1.145.3 icmp_seq=3 Destination Host Unreachable
From 10.1.145.3 icmp_seq=4 Destination Host Unreachable
From 10.1.145.3 icmp_seq=5 Destination Host Unreachable
From 10.1.145.3 icmp_seq=6 Destination Host Unreachable
From 10.1.145.3 icmp_seq=7 Destination Host Unreachable
From 10.1.145.3 icmp_seq=8 Destination Host Unreachable
From 10.1.145.3 icmp_seq=9 Destination Host Unreachable
From 10.1.145.3 icmp_seq=10 Destination Host Unreachable

--- 10.1.145.51 ping statistics ---
10 packets transmitted, 0 received, +10 errors, 100% packet loss, time 9046ms
pipe 3

请问大家，这是怎么回事？

[恒河沙数1]

自己顶一下～