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WPA2 企业网络 (UPC Wi-free) 上的 DHCP 租约已到期

tag-icon • tag-icon wireless 17.10 dhcp wpa2
WPA2 企业网络 (UPC Wi-free) 上的 DHCP 租约已到期

我经常连接到我的 ISP 创建的热门热点网络（UPC 的 Wi-free，如 Fon）。这是一个具有 MSCHAPv2 身份验证的 WPA2 企业网络。它以前运行良好。

然而，最近我经历了与 DHCP 租约到期相关的频繁断线。物理 wifi 连接保持活动状态，但接口丢失了其 IP 地址，并且我失去了与互联网的连接。

 dhclient[25316]: DHCPREQUEST of 203.0.113.17 on wlp2s0 to 10.177.0.1 port 67 (xid=0x55c8a752)
 dhclient[25316]: message repeated 2 times: [ DHCPREQUEST of 203.0.113.17 on wlp2s0 to 10.177.0.1 port 67 (xid=0x55c8a752)]
 dhclient[25316]: DHCPREQUEST of 203.0.113.17 on wlp2s0 to 255.255.255.255 port 67 (xid=0x55c8a752)
 NetworkManager[23498]: <info>  [1514411098.7236] dhcp4 (wlp2s0): state changed bound -> expire
 NetworkManager[23498]: <info>  [1514411098.7563] dhcp4 (wlp2s0): canceled DHCP transaction, DHCP client pid 25316
 NetworkManager[23498]: <info>  [1514411098.7564] dhcp4 (wlp2s0): state changed expire -> done
 NetworkManager[23498]: <info>  [1514411098.7578] device (wlp2s0): scheduling DHCPv4 restart in 120 seconds, 3 tries left (reason: lease expired)
 avahi-daemon[1021]: Withdrawing address record for 203.0.113.17 on wlp2s0.

并非所有的租约续签都会失败

 dhclient[25316]: DHCPREQUEST of 203.0.113.17 on wlp2s0 to 255.255.255.255 port 67 (xid=0x55c8a752)
 dhclient[25316]: DHCPACK of 203.0.113.17 from 62.179.2.155
 NetworkManager[23498]: <info>  [1514410926.0094] dhcp4 (wlp2s0):   address 203.0.113.17
 NetworkManager[23498]: <info>  [1514410926.0095] dhcp4 (wlp2s0):   plen 25 (255.255.255.128)
 NetworkManager[23498]: <info>  [1514410926.0096] dhcp4 (wlp2s0):   gateway 203.0.113.12
 NetworkManager[23498]: <info>  [1514410926.0096] dhcp4 (wlp2s0):   lease time 60
 NetworkManager[23498]: <info>  [1514410926.0096] dhcp4 (wlp2s0):   hostname 'thisubuntulaptop'
 NetworkManager[23498]: <info>  [1514410926.0097] dhcp4 (wlp2s0):   nameserver '62.179.1.60'
 NetworkManager[23498]: <info>  [1514410926.0097] dhcp4 (wlp2s0):   nameserver '62.179.1.61'
 dbus[1066]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service'
 NetworkManager[23498]: <info>  [1514410926.0098] dhcp4 (wlp2s0):   domain name 'chello.pl'
 NetworkManager[23498]: <info>  [1514410926.0098] dhcp4 (wlp2s0): state changed bound -> bound
 systemd[1]: Starting Network Manager Script Dispatcher Service...
 dhclient[25316]: bound to 203.0.113.17 -- renewal in 25 seconds.

但他们经常这样做，而且由于租赁时间只有 60 秒，这会导致非常频繁的中断。

我如何找出原因并防止这些续订失败的发生？

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