问题表现
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1）连接win7虚拟的路由均没有问题；
2）在图书馆连接公共wifi不能保持连接，一段时间后网络无法联通，但Networkmanager显示连接没有断开，只是没有网。此 时重新连接该wifi 问题解决，但几分钟后问题重现；
3）在图书馆使用win7和移动设备连接网络没有问题；
4）本机双系统在重启到win7后再重启到linux时，以上2问题消失。但关机再启动到linux时问题再现。
尝试解决
-----------------------------------------------------------------------
1）更换wicd，失败;
2）更新网卡驱动，已经最新；
3）关闭dnsmaqs服务，失败。
系统日志分析
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$tac /var/log/syslog | less
———————————重新连接wifi ——————————————-
Nov 14 08:37:40 miracle dbus[3095]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher’
Nov 14 08:37:40 miracle dbus[3095]: [system] Activating service name=’org.freedesktop.nm_dispatcher’ (using servicehelper)
Nov 14 08:37:40 miracle NetworkManager[3218]:nameserver ‘61.128.192.68’
Nov 14 08:37:40 miracle NetworkManager[3218]:nameserver ‘61.128.128.68’
Nov 14 08:37:40 miracle NetworkManager[3218]:gateway 222.176.232.1
Nov 14 08:37:40 miracle NetworkManager[3218]:prefix 21 (255.255.248.0)
Nov 14 08:37:40 miracle NetworkManager[3218]:address 222.176.234.83
Nov 14 08:37:40 miracle NetworkManager[3218]:(wlan0): DHCPv4 state changed bound -> renew
Nov 14 08:37:40 miracle dhclient: bound to 222.176.234.83 — renewal in 112 seconds.
Nov 14 08:37:40 miracle dhclient: DHCPACK from 222.176.232.1
Nov 14 08:37:40 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:37:29 miracle dbus[3095]: [system] Successfully activated service ‘org.freedesktop.PackageKit’
Nov 14 08:37:26 miracle dbus[3095]: [system] Activating service name=’org.freedesktop.PackageKit’ (using servicehelper)
Nov 14 08:36:24 miracle NetworkManager[3218]:Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Nov 14 08:36:24 miracle NetworkManager[3218]:Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) started…
Nov 14 08:36:24 miracle NetworkManager[3218]:Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled…
Nov 14 08:36:24 miracle NetworkManager[3218]:(wlan0): IP6 addrconf timed out or failed.
Nov 14 08:36:19 miracle ntpd_intres[3601]: DNS 2.debian.pool.ntp.org -> 24.25.4.103
Nov 14 08:36:15 miracle ntpd_intres[3601]: DNS 0.debian.pool.ntp.org -> 202.120.2.101
Nov 14 08:36:07 miracle ntpd[3534]: peers refreshed
Nov 14 08:36:07 miracle ntpd[3534]: 202.112.29.82 interface 172.20.41.207 -> (none)
Nov 14 08:36:07 miracle ntpd[3534]: 202.112.31.197 interface 172.20.41.207 -> (none)
Nov 14 08:36:07 miracle ntpd[3534]: Deleting interface
#5 wlan0, 172.20.41.207#
1:

———————————-有网——————————————-
Nov 14 08:40:10 miracle dnsmasq-dhcp[3006]: no address range available for DHCP request via wlan0
Nov 14 08:40:05 miracle dnsmasq-dhcp[3006]: no address range available for DHCP request via wlan0
Nov 14 08:40:02 miracle dnsmasq-dhcp[3006]: no address range available for DHCP request via wlan0
Nov 14 08:40:01 miracle dnsmasq-dhcp[3006]: no address range available for DHCP request via wlan0
Nov 14 08:40:00 miracle dnsmasq-dhcp[3006]: no address range available for DHCP request via wlan0
Nov 14 08:39:59 miracle dnsmasq-dhcp[3006]: no address range available for DHCP request via wlan0
Nov 14 08:39:32 miracle dbus[3095]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher’
———————————有网—————————————-
Nov 14 08:41:26 miracle dbus[3095]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher’
Nov 14 08:41:26 miracle dbus[3095]: [system] Activating service name=’org.freedesktop.nm_dispatcher’ (using servicehelper)
Nov 14 08:41:25 miracle NetworkManager[3218]:nameserver ‘61.128.192.68’
Nov 14 08:41:25 miracle NetworkManager[3218]:nameserver ‘61.128.128.68’
Nov 14 08:41:25 miracle NetworkManager[3218]:gateway 222.176.232.1
Nov 14 08:41:25 miracle NetworkManager[3218]:prefix 21 (255.255.248.0)
Nov 14 08:41:25 miracle NetworkManager[3218]:address 222.176.234.83
Nov 14 08:41:25 miracle NetworkManager[3218]:(wlan0): DHCPv4 state changed renew -> renew
Nov 14 08:41:25 miracle dhclient: bound to 222.176.234.83 — renewal in 99 seconds.
Nov 14 08:41:25 miracle dhclient: DHCPACK from 222.176.232.1
Nov 14 08:41:25 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:40:10 miracle dnsmasq-dhcp[3006]: no address range available for DHCP request via wlan0
——————————-Y————————————
Nov 14 08:44:24 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:44:11 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:43:56 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:43:42 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:43:25 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:43:12 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:43:04 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67

——————————-断网—————————-
Nov 14 08:45:09 miracle dhclient: DHCPREQUEST on wlan0 to 255.255.255.255 port 67
Nov 14 08:44:56 miracle dhclient: DHCPREQUEST on wlan0 to 255.255.255.255 port 67
Nov 14 08:44:48 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 08:44:39 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
——————————-N————————-
Nov 14 08:45:48 miracle dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 10
Nov 14 08:45:40 miracle dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
Nov 14 08:45:32 miracle dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
Nov 14 08:45:26 miracle NetworkManager[3218]:(wlan0): DHCPv4 state changed expire -> preinit
Nov 14 08:45:26 miracle dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6
Nov 14 08:45:26 miracle NetworkManager[3218]:(wlan0): DHCPv4 state changed renew -> expire
—————————-N———————-
Nov 14 08:46:06 miracle dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 18
Nov 14 08:45:58 miracle dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8
在一堆DHCPREQUEST后断 网。。。

从win重启后查看日志(此时段内 网络连接没有问题)
$watch -d -n 1 tac /var/log/syslog
Nov 14 09:55:10 miracle dnsmasq-dhcp[2999]: no address range available for DHCP
request via wlan0
Nov 14 09:55:02 miracle dnsmasq-dhcp[2999]: no address range available for DHCP
request via wlan0
Nov 14 09:54:54 miracle dbus[3148]: [system] Successfully activated service ‘org
.freedesktop.nm_dispatcher’
Nov 14 09:54:54 miracle dbus[3148]: [system] Activating service name=’org.freede
sktop.nm_dispatcher’ (using servicehelper)
Nov 14 09:54:54 miracle NetworkManager[3194]:nameserver ‘61.128.192.68
‘
Nov 14 09:54:54 miracle NetworkManager[3194]:nameserver ‘61.128.128.68
‘
Nov 14 09:54:54 miracle NetworkManager[3194]:gateway 222.176.232.1
Nov 14 09:54:54 miracle NetworkManager[3194]:prefix 21 (255.255.248.0)
Nov 14 09:54:54 miracle NetworkManager[3194]:address 222.176.238.100
Nov 14 09:54:54 miracle NetworkManager[3194]:(wlan0): DHCPv4 state chang
ed renew -> renew
Nov 14 09:54:54 miracle dhclient: bound to 222.176.238.100 — renewal in 102 sec
onds.
Nov 14 09:54:54 miracle dhclient: DHCPACK from 222.176.232.1
Nov 14 09:54:54 miracle dhclient: DHCPREQUEST on wlan0 to 222.176.232.1 port 67
Nov 14 09:54:53 miracle dnsmasq-dhcp[2999]: no address range available for DHCP
request via wlan0
。。。。重复dnsmasq-dhcp信息，之后回到日志开始处，此处消失了 DHCPREQUEST

系统运行环境
linux mint debian edition + xfce4 + networkmanager 0.9.8.4
$ uname -a
Linux miracle 3.10-3-686-pae #1 SMP Debian 3.10.11-1 (2013-09-10) i686 GNU/Linux
真的很奇怪的问题，哪位大神懂的给 分析下？先谢了。

$ lsmod | grep "brcmsmac\|b43\|ssb\|bcma\|wl"
brcmsmac 417913 0
cordic 12336 1 brcmsmac
brcmutil 12941 1 brcmsmac
mac80211 309057 1 brcmsmac
cfg80211 264217 2 brcmsmac,mac80211
bcma 32632 1 brcmsmac
$
lsp
ci -vnn | grep 14e4
06:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)
Subsystem: Broadcom Corporation Device [14e4:0510]
按照http://community.linuxmint.com/tutorial/view/218官方教程安装闭源驱动，显示build not successfully。
真是快哭了。居然要靠重启到win才能保持wifi连接。

换了闭源驱动，结果路由彻底连不上了，重启到win也不行了。又想重装系统了。。（装LMDE不就是为了不重装嘛！！！）

试试broadcom-sta-dkms

换回到默认的brcmsmac了，起码这个还可以连接，虽然每隔几分钟就断一次。
说下驱动安装的过程吧：
1.wl驱动，博通自己的私有驱动：https://wiki.debian.org/zh_CN/wl，也是吧主说的broadcom-sta-dkms。链接里说的很清楚；
2.开源驱动：https://wiki.debian.org/brcm80211
3.LMDE论坛上说的，broadcom-sta-source驱动，http://community.linuxmint.com/tutorial/view/218.反正这个我是没有安装成功，上面两个都成功了。
三个驱动装的时候会自动卸载或者blacklist其他驱动。
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累感不爱。

我的也是博通无线网卡，使用broadcom-sta-dkms安装的驱动，可以正常连接Tp-Link无线路由器。