我在一家小公司工作，我们使用华硕 RT-N18U。我们的办公室很小，是商业园区的一部分，我们的网络通过有线方式接入，是商业园区提供的套餐的一部分。
昨天我们停电了，从那时起我们就无法上网了。我可以连接到我们的本地服务器、打印机等，但仅此而已。我不知道问题是什么，但如果我能知道问题是出在我们的局域网内部还是外部，那就好了
编辑：我无法从路由器控制台 ping googles（或任何其他）服务器。
路由器日志显示以下内容：
Aug 1 02:00:11 syslogd started: BusyBox v1.17.4
Aug 1 02:00:11 kernel: klogd started: BusyBox v1.17.4 (2016-02-03 06:01:20 CST)
Aug 1 02:00:11 kernel: Linux version 2.6.36.4brcmarm (gitserv_asus@wireless-pub1) (gcc version 4.5.3 (Buildroot 2012.02) ) #1 PREEMPT Wed Feb 3 06:09:47 CST 2016
Aug 1 02:00:11 kernel: CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c53c7f
Aug 1 02:00:11 kernel: CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Aug 1 02:00:11 kernel: Machine: Northstar Prototype
Aug 1 02:00:11 kernel: Ignoring unrecognised tag 0x00000000
Aug 1 02:00:11 kernel: Memory policy: ECC disabled, Data cache writeback
Aug 1 02:00:11 kernel: Built 1 zonelists in Zone order, mobility grouping on. Total pages: 60416
Aug 1 02:00:11 kernel: Kernel command line: root=/dev/mtdblock2 console=ttyS0,115200 init=/sbin/preinit earlyprintk debug
Aug 1 02:00:11 kernel: Memory: 255708k/255708k available, 6436k reserved, 0K highmem
Aug 1 02:00:11 kernel: Virtual kernel memory layout:
Aug 1 02:00:11 kernel: vector : 0xffff0000 - 0xffff1000 ( 4 kB)
Aug 1 02:00:11 kernel: fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
Aug 1 02:00:11 kernel: DMA : 0xf7e00000 - 0xffe00000 ( 128 MB)
Aug 1 02:00:11 kernel: vmalloc : 0xd0800000 - 0xf0000000 ( 504 MB)
Aug 1 02:00:11 kernel: lowmem : 0xc0000000 - 0xd0000000 ( 256 MB)
Aug 1 02:00:11 kernel: modules : 0xbf000000 - 0xc0000000 ( 16 MB)
Aug 1 02:00:11 kernel: .init : 0xc0008000 - 0xc0037000 ( 188 kB)
Aug 1 02:00:11 kernel: .text : 0xc0037000 - 0xc0390000 (3428 kB)
Aug 1 02:00:11 kernel: .data : 0xc03a8000 - 0xc03c7ec0 ( 128 kB)
Aug 1 02:00:11 kernel: * Invalid signature of oopsbuf: FF-FF-FF-BE-FE-FF-FF-FF (len 4294967295)
Aug 1 02:00:11 kernel: External imprecise Data abort at addr=0x0, fsr=0x1c06 ignored.
Aug 1 02:00:11 kernel: Mount-cache hash table entries: 512
Aug 1 02:00:11 kernel: Found a AMD NAND flash:
Aug 1 02:00:11 kernel: Total size: 128MB
Aug 1 02:00:11 kernel: Block size: 128KB
Aug 1 02:00:11 kernel: Page Size: 2048B
Aug 1 02:00:11 kernel: OOB Size: 64B
Aug 1 02:00:11 kernel: Sector size: 512B
Aug 1 02:00:11 kernel: Spare size: 16B
Aug 1 02:00:11 kernel: ECC level: 8 (8-bit)
Aug 1 02:00:11 kernel: Device ID: 0x 1 0xf1 0x 0 0x1d 0x 1 0xf1
Aug 1 02:00:11 kernel: bio: create slab <bio-0> at 0
Aug 1 02:00:11 kernel: PCI: no core
Aug 1 02:00:12 kernel: PCI: no core
Aug 1 02:00:12 kernel: PCI: Fixing up bus 0
Aug 1 02:00:12 kernel: PCI: Fixing up bus 0
Aug 1 02:00:12 kernel: PCI: Fixing up bus 1
Aug 1 02:00:12 kernel: VFS: Disk quotas dquot_6.5.2
Aug 1 02:00:12 kernel: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
Aug 1 02:00:12 kernel: pflash: found no supported devices
Aug 1 02:00:12 kernel: bcmsflash: found no supported devices
Aug 1 02:00:12 kernel: Boot partition size = 524288(0x80000)
Aug 1 02:00:12 kernel: lookup_nflash_rootfs_offset: offset = 0x200000
Aug 1 02:00:12 kernel: nflash: squash filesystem with lzma found at block 28
Aug 1 02:00:12 kernel: Creating 4 MTD partitions on "nflash":
Aug 1 02:00:12 kernel: 0x000000000000-0x000000080000 : "boot"
Aug 1 02:00:12 kernel: 0x000000080000-0x000000200000 : "nvram"
Aug 1 02:00:12 kernel: 0x000000200000-0x000004000000 : "linux"
Aug 1 02:00:12 kernel: 0x00000038d3e0-0x000004000000 : "rootfs"
Aug 1 02:00:12 stop_nat_rules: apply the redirect_rules!
Aug 1 02:00:12 kernel: Registering the dns_resolver key type
Aug 1 02:00:12 kernel: Spare area=64 eccbytes 56, ecc bytes located at:
Aug 1 02:00:12 kernel: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 18 19 20 21 22 23 24 25 26 27 28 29 30 31 34 35 36 37 38 39 40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57 58 59 60 61 62 63
Aug 1 02:00:12 kernel: Available 7 bytes at (off,len):
Aug 1 02:00:12 kernel: (1,1) (16,2) (32,2) (48,2) (0,0) (0,0) (0,0) (0,0)
Aug 1 02:00:12 kernel: Options: NO_AUTOINCR,NO_READRDY,BBT_SCAN2NDPAGE,
Aug 1 02:00:12 kernel: Creating 2 MTD partitions on "brcmnand":
Aug 1 02:00:12 kernel: 0x000004000000-0x000007ec0000 : "brcmnand"
Aug 1 02:00:12 kernel: 0x000007ec0000-0x000008000000 : "asus"
Aug 1 02:00:12 kernel: VFS: Mounted root (squashfs filesystem) readonly on device 31:3.
Aug 1 02:00:12 kernel: et: module license 'Proprietary' taints kernel.
Aug 1 02:00:12 kernel: Disabling lock debugging due to kernel taint
Aug 1 02:00:12 kernel: et_module_init: passivemode set to 0x0
Aug 1 02:00:12 kernel: et_module_init: txworkq set to 0x1
Aug 1 02:00:12 kernel: et_module_init: et_txq_thresh set to 0x400
Aug 1 02:00:12 kernel: eth0: Broadcom BCM47XX 10/100/1000 Mbps Ethernet Controller 6.37.14.105 (r485445)
Aug 1 02:00:12 kernel: wl_module_init: passivemode set to 0x0
Aug 1 02:00:12 WAN Connection: ISP's DHCP did not function properly.
Aug 1 02:00:12 kernel: wl_module_init: igs set to 0x0
Aug 1 02:00:12 kernel: wl_module_init: txworkq set to 0x1
Aug 1 02:00:12 kernel: eth1: Broadcom BCM4360 802.11 Wireless Controller 6.37.14.105 (r485445)
Aug 1 02:00:16 dnsmasq[382]: warning: interface ppp1* does not currently exist
Aug 1 02:00:16 RT-N18U: start httpd
Aug 1 02:00:17 syslog: Generating SSL certificate...
Aug 1 02:00:17 disk monitor: be idle
Aug 1 02:00:17 hour monitor: daemon is starting
Aug 1 02:00:17 hour monitor: daemon terminates
Aug 1 02:00:17 miniupnpd[427]: version 1.9 started
Aug 1 02:00:17 miniupnpd[427]: HTTP listening on port 54077
Aug 1 02:00:17 miniupnpd[427]: Listening for NAT-PMP/PCP traffic on port 5351
Aug 1 02:00:18 start_nat_rules: apply the nat_rules(/tmp/nat_rules_eth0_eth0)!
Aug 1 02:00:18 syslog: module ledtrig-usbdev not found in modules.dep
Aug 1 02:00:18 syslog: module leds-usb not found in modules.dep
Aug 1 02:00:18 kernel: SCSI subsystem initialized
Aug 1 02:00:20 kernel: xt_connbytes: Forcing CT accounting to be enabled
Aug 1 02:00:21 kernel: nf_conntrack_rtsp v0.6.21 loading
Aug 1 02:00:21 kernel: nf_nat_rtsp v0.6.21 loading
Aug 1 02:00:21 kernel: jnl: driver (lke_9.2.0, Feb 3 2016 06:59:53, LBD=ON) loaded at bf5fa000
Aug 1 02:00:21 wan: finish adding multi routes
Aug 1 02:00:22 kernel: ufsd:: trace mask set to 0000000f
Aug 1 02:00:22 kernel: ufsd: driver (lke_9.2.0 lke_9.2.0_r248656_b5, build_host("wireless-pub1"), acl, ioctl, bdi, sd2(0), wb, bz, tr, rsrc) loaded at bf607000
Aug 1 02:00:22 kernel: NTFS support included
Aug 1 02:00:22 kernel: Hfs+/HfsJ support included
Aug 1 02:00:22 kernel: optimized: speed
Aug 1 02:00:22 kernel: Build_for__ASUS_PRODUCTS_003_k2.6.36_2013-11-07_lke_9.2.0_r248656_b5
Aug 1 02:00:22 kernel: xhci_hcd 0000:00:0c.0: Failed to enable MSI-X
Aug 1 02:00:22 kernel: xhci_hcd 0000:00:0c.0: failed to allocate MSI entry
Aug 1 02:00:22 kernel: usb usb1: No SuperSpeed endpoint companion for config 1 interface 0 altsetting 0 ep 129: using minimum values
Aug 1 02:00:22 WAN Connection: WAN was restored.
Aug 1 02:00:48 hour monitor: daemon is starting
Aug 1 02:00:48 hour monitor: ntp is not syn
Aug 1 02:01:06 rc_service: udhcpc 432:notify_rc stop_upnp
Aug 1 02:01:06 rc_service: udhcpc 432:notify_rc start_upnp
Aug 1 02:01:06 rc_service: waitting "stop_upnp" via udhcpc ...
Aug 1 02:01:06 miniupnpd[427]: shutting down MiniUPnPd
Aug 1 02:01:08 miniupnpd[629]: version 1.9 started
Aug 1 02:01:08 miniupnpd[629]: HTTP listening on port 47237
Aug 1 02:01:08 miniupnpd[629]: Listening for NAT-PMP/PCP traffic on port 5351
Aug 1 02:01:09 kernel: HTB: quantum of class 10002 is big. Consider r2q change.
Aug 1 02:01:09 kernel: HTB: quantum of class 10060 is big. Consider r2q change.
Aug 1 02:01:09 dhcp client: bound 192.168.0.102 via 192.168.0.254 during 60 seconds.
Aug 1 02:01:17 hour monitor: daemon is starting
Aug 1 02:01:17 hour monitor: ntp is not syn
Aug 1 02:01:47 hour monitor: daemon is starting
Aug 1 02:01:47 hour monitor: ntp is not syn
Aug 1 02:02:17 hour monitor: daemon is starting
Aug 1 02:02:17 hour monitor: ntp is not syn
Aug 1 02:02:47 hour monitor: daemon is starting
Aug 1 02:02:47 hour monitor: ntp is not syn
Aug 1 02:03:17 hour monitor: daemon is starting
Aug 1 02:03:17 hour monitor: ntp is not syn
答案1
日志中有一行有趣的内容：
Aug 1 02:01:09 dhcp client: bound 192.168.0.102 via 192.168.0.254 during 60 seconds.
这一行中有两条有趣的信息。首先，192.168.0.102是 RFC 1918 地址。这不是您期望分配给路由器 WAN 的地址。此外，during 60 seconds这也不完全是我所期望的。
您没有提到您的 WAN 接口连接到什么设备。但您看到的内容与连接到电缆调制解调器（电缆端没有连接）的路由器上看到的内容非常相似：
Apr 8 09:55:49 hostname dhclient: bound to 192.168.87.102 -- renewal in 26 seconds.
相似之处在于两者都是 RFC 1918 地址，并且两种情况下的租用时间都比正常情况短得多。调制解调器使用较短的租用时间可确保您的路由器在恢复连接后快速获得真实 IP 地址。
因此，我会检查已将该 IP 地址分配给路由器的调制解调器，因为该调制解调器很可能没有互联网连接。运气好的话，您只需要重新启动该调制解调器。如果这没有帮助，您可以在重新启动调制解调器 30 分钟后尝试重新启动路由器。如果连接仍然不起作用，您必须联系负责调制解调器的 ISP。