西安石油大学鄠邑校区，server ip ping不通。Network is unreachable

系统macOS、使用wifi接入校园网、drcom 5.2.0 d版

抓包得到server ip为192.168.255.249，未认证状态下直接用终端ping不通，使用网页认证成功之后可以ping通。

目前使用的配置
```
server = '192.168.255.249'
username = '21211088888'
password = '290888'
CONTROLCHECKSTATUS = '\x20'
ADAPTERNUM = '\x01'
host_ip = '10.129.129.14'
IPDOG = '\x01'
host_name = 'mac'
PRIMARY_DNS = '10.200.4.1'
dhcp_server = '10.29.6.254'
AUTH_VERSION = '\x0A\x00'
mac = 0x086d41cd26c4
host_os = '8089D'
KEEP_ALIVE_VERSION = '\xDC\x02'
ror_version = True
keepalive1_mod = True
```

下图为运行报错结果。

运行日志里只有这几行
```
auth svr: 192.168.255.249
username: 21211xxxxx
password: 29xxxxx
mac: 0x86d41cd26c
bind ip: 0.0.0.0
```