为什么RT-AC68U的客户端每天都会断线
RT-AC68U刷梅林小宝的固件后，客户端每天都会断线，重启之后才能连上。观察过无线信号是满格的，应该和无线无关。
刷回官方固件，也一样，系统日志大概像下面这样子（详细的日志在附件中）：
Aug1 08:00:23 kernel: ohci_hcd 0000:00:0b.0: new USB bus registered, assigned bus number 2
Aug1 08:00:23 kernel: ohci_hcd 0000:00:0b.0: irq 111, io mem 0x18022000
Aug1 08:00:23 kernel: hub 2-0:1.0: USB hub found
Aug1 08:00:23 kernel: hub 2-0:1.0: 2 ports detected
Aug1 08:00:23 kernel: usbcore: registered new interface driver usblp
Aug1 08:00:23 kernel: usbcore: registered new interface driver asix
Aug1 08:00:23 kernel: usbcore: registered new interface driver cdc_ether
Aug1 08:00:23 kernel: usbcore: registered new interface driver rndis_host
Aug1 08:00:23 kernel: cdc_ncm: 14-Mar-2012
Aug1 08:00:23 kernel: usbcore: registered new interface driver cdc_ncm
Aug1 08:00:23 kernel: usbcore: registered new interface driver cdc_wdm
Aug1 08:00:23 kernel: usbcore: registered new interface driver qmi_wwan
Aug1 08:00:23 kernel: cdc_mbim: loaded
Aug1 08:00:24 kernel: usbcore: registered new interface driver cdc_mbim
Aug1 08:00:26 pppd: Remote message: Authentication success,Welcome!
Aug1 08:00:26 pppd: PAP authentication succeeded
Aug1 08:00:26 pppd: peer from calling number AC:4E:91:65:81:10 authorized
Aug1 08:00:27 dnsmasq-dhcp: DHCPDISCOVER(br0) 10:ae:60:3e:14:93
Aug1 08:00:27 dnsmasq-dhcp: DHCPOFFER(br0) 192.168.1.188 10:ae:60:3e:14:93
Aug1 08:00:27 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.188 10:ae:60:3e:14:93
Aug1 08:00:27 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.188 10:ae:60:3e:14:93
Aug1 08:00:27 pppd: localIP address 183.157.95.58
Aug1 08:00:27 pppd: remote IP address 183.157.88.1
Aug1 08:00:27 pppd: primary DNS address 202.101.172.35
Aug1 08:00:27 pppd: secondary DNS address 202.101.172.47
Aug1 08:00:27 rc_service: ip-up 603:notify_rc start_firewall
Aug1 08:00:27 dnsmasq: read /etc/hosts - 5 addresses
Aug1 08:00:27 dnsmasq: using nameserver 202.101.172.35#53
Aug1 08:00:27 dnsmasq: using nameserver 202.101.172.47#53
Aug1 08:00:28 start_nat_rules: apply the nat_rules(/tmp/nat_rules_ppp0_eth0)!
Aug1 08:00:28 wan: finish adding multi routes
Aug1 08:00:28 rc_service: ip-up 603:notify_rc stop_upnp
Aug1 08:00:28 rc_service: waitting "start_firewall" via ip-up ...
Aug1 08:00:28 WAN Connection: WAN was restored.
Aug1 08:00:29 kernel: nf_conntrack_rtsp v0.6.21 loading
Aug1 08:00:29 kernel: nf_nat_rtsp v0.6.21 loading
Aug1 08:00:29 rc_service: ip-up 603:notify_rc start_upnp
Aug1 08:00:29 rc_service: waitting "stop_upnp" via ip-up ...
Aug1 08:00:29 miniupnpd: shutting down MiniUPnPd
Aug1 08:00:31 miniupnpd: version 1.9 started
Aug1 08:00:31 miniupnpd: HTTP listening on port 56101
Aug1 08:00:31 miniupnpd: Listening for NAT-PMP/PCP traffic on port 5351
Aug1 08:00:32 ntp: start NTP update
Oct 25 17:50:16 rc_service: ntp 670:notify_rc restart_upnp
Oct 25 17:50:16 miniupnpd: shutting down MiniUPnPd
Oct 25 17:50:16 miniupnpd: version 1.9 started
Oct 25 17:50:16 miniupnpd: HTTP listening on port 35523
Oct 25 17:50:16 miniupnpd: Listening for NAT-PMP/PCP traffic on port 5351
Oct 25 17:50:17 rc_service: ntp 670:notify_rc restart_diskmon
Oct 25 17:50:17 disk_monitor: Finish
Oct 25 17:50:19 disk monitor: be idle
Oct 25 17:50:26 rc_service: zcip 686:notify_rc start_firewall
Oct 25 17:50:26 zcip client: configured 169.254.121.235
Oct 25 17:50:26 start_nat_rules: apply the nat_rules(/tmp/nat_rules_ppp0_eth0)!
Oct 25 17:50:28 dnsmasq-dhcp: DHCPDISCOVER(br0) e0:b5:2d:0d:9a:24
Oct 25 17:50:28 dnsmasq-dhcp: DHCPOFFER(br0) 192.168.1.210 e0:b5:2d:0d:9a:24
Oct 25 17:50:28 dnsmasq: read /etc/hosts - 5 addresses
Oct 25 17:50:28 dnsmasq: using nameserver 202.101.172.35#53
Oct 25 17:50:28 dnsmasq: using nameserver 202.101.172.47#53
Oct 25 17:50:28 dnsmasq-dhcp: DHCPDISCOVER(br0) e0:b5:2d:0d:9a:24
Oct 25 17:50:28 dnsmasq-dhcp: DHCPOFFER(br0) 192.168.1.210 e0:b5:2d:0d:9a:24
Oct 25 17:50:29 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.210 e0:b5:2d:0d:9a:24
Oct 25 17:50:29 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.210 e0:b5:2d:0d:9a:24 chenjimdeiPhone
Oct 25 17:50:35 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.5 c0:9f:42:c8:17:53
Oct 25 17:50:35 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.5 c0:9f:42:c8:17:53 iPad
Oct 25 17:50:43 crond: time disparity of 650030 minutes detected
Oct 25 17:51:09 pppd: System time change detected.
Oct 25 17:51:28 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.249 54:ae:27:1d:7b:6c
Oct 25 17:51:28 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.249 54:ae:27:1d:7b:6c shouibiitekiair
Oct 25 17:56:10 dnsmasq-dhcp: DHCPDISCOVER(br0) 10:ae:60:3e:14:93
Oct 25 17:56:10 dnsmasq-dhcp: DHCPOFFER(br0) 192.168.1.188 10:ae:60:3e:14:93
Oct 25 17:56:10 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.188 10:ae:60:3e:14:93
Oct 25 17:56:10 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.188 10:ae:60:3e:14:93
Oct 25 18:00:19 disk_monitor: Got SIGALRM...
Oct 25 18:30:03 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.237 38:2d:d1:d7:e7:d3
Oct 25 18:30:03 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.237 38:2d:d1:d7:e7:d3 android-e98db87ca3d9eab0
Oct 25 18:31:07 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.33 0c:77:1a:73:93:15
Oct 25 18:31:07 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.33 0c:77:1a:73:93:15 linminde-iPhone
Oct 25 18:34:21 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.32 dc:2b:2a:79:a5:51
Oct 25 18:34:21 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.32 dc:2b:2a:79:a5:51 xiaowaideiPhone
Oct 25 18:35:15 dnsmasq-dhcp: DHCPDISCOVER(br0) e0:b5:2d:0d:9a:24
Oct 25 18:35:15 dnsmasq-dhcp: DHCPOFFER(br0) 192.168.1.210 e0:b5:2d:0d:9a:24
Oct 25 18:35:16 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.210 e0:b5:2d:0d:9a:24
Oct 25 18:35:16 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.210 e0:b5:2d:0d:9a:24 chenjimdeiPhone
Oct 25 19:15:38 dnsmasq-dhcp: DHCPDISCOVER(br0) bc:25:e0:56:36:84
Oct 25 19:15:38 dnsmasq-dhcp: DHCPOFFER(br0) 192.168.1.19 bc:25:e0:56:36:84
Oct 25 19:15:38 dnsmasq-dhcp: DHCPDISCOVER(br0) bc:25:e0:56:36:84
Oct 25 19:15:38 dnsmasq-dhcp: DHCPOFFER(br0) 192.168.1.19 bc:25:e0:56:36:84
Oct 25 19:15:39 dnsmasq-dhcp: DHCPREQUEST(br0) 192.168.1.19 bc:25:e0:56:36:84
Oct 25 19:15:39 dnsmasq-dhcp: DHCPACK(br0) 192.168.1.19 bc:25:e0:56:36:84 M330
Aug1 08:00:12 syslogd started: BusyBox v1.17.4
Aug1 08:00:12 kernel: klogd started: BusyBox v1.17.4 (2016-07-06 20:15:37 CST)
Aug1 08:00:12 kernel: Linux version 2.6.36.4brcmarm (root@asus) (gcc version 4.5.3 (Buildroot 2012.02) ) #1 SMP PREEMPT Wed Jul 6 20:24:14 CST 2016
从log中攫取到的相关DHCP信息，没有看出有异常啊？
不管是新加入的设备，还是续租IP的设备，都是正确的。为什么不能断线后重连呢？很诡异！
而且，这些DHCP相关信息都是24小时一次，若你没动DHCP Server那边的设置的话，符合DHCP Lease时间。
可以尝试刷回官方固件，然后reset，再观察看看。
http://www.52asus.com/thread-2910-1-1.html 不知这个坛友的贴子有帮助没。
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