大约是在02：19分的时候进行dhcp，随后从现象上看到了死机，大约02：26重启完成，求大神帮忙分析死机原因～谢谢！
Nov 22 02:17:00 TB15-NTA1000 kernel: wlan0: authenticate with 00:17:c5:ea:4a:d9
Nov 22 02:17:00 TB15-NTA1000 kernel: wlan0: send auth to 00:17:c5:ea:4a:d9 (try 1/3)
Nov 22 02:17:00 TB15-NTA1000 kernel: wlan0: authenticated
Nov 22 02:17:00 TB15-NTA1000 kernel: iwlwifi 0000:0a:00.0 wlan0: disabling HT/VHT due to WEP/TKIP use
Nov 22 02:17:00 TB15-NTA1000 kernel: wlan0: associate with 00:17:c5:ea:4a:d9 (try 1/3)
Nov 22 02:17:00 TB15-NTA1000 kernel: wlan0: RX AssocResp from 00:17:c5:ea:4a:d9 (capab=0x411 status=0 aid=1)
Nov 22 02:17:00 TB15-NTA1000 kernel: wlan0: associated
Nov 22 02:17:27 TB15-NTA1000 ntpd[2055]: Deleting interface #12 wlan0, 2.2.2.47#123, interface stats: received=0, sent=0, dropped=0, active_time=274 secs
Nov 22 02:17:30 TB15-NTA1000 kernel: wlan0: deauthenticating from 00:17:c5:ea:4a:d9 by local choice (reason=3)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: Calling CRDA to update world regulatory domain
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: World regulatory domain updated:
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: Calling CRDA for country: US
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: Regulatory domain changed to country: US
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: DFS Master region FCC
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 3000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 2300 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz), (N/A, 2300 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (5490000 KHz - 5730000 KHz @ 160000 KHz), (N/A, 2300 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 3000 mBm)
Nov 22 02:17:30 TB15-NTA1000 kernel: cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm)
Nov 22 02:17:32 TB15-NTA1000 ntpd[2055]: Deleting interface #7 wlan0, fe80::215:ff:feb9:9baf#123, interface stats: received=0, sent=0, dropped=0, active_time=3122 secs
Nov 22 02:19:42 TB15-NTA1000 kernel: iwlwifi 0000:0a:00.0: L1 Disabled - LTR Disabled
Nov 22 02:19:42 TB15-NTA1000 kernel: iwlwifi 0000:0a:00.0: L1 Disabled - LTR Disabled
Nov 22 02:19:42 TB15-NTA1000 kernel: IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
Nov 22 02:19:56 TB15-NTA1000 kernel: wlan0: authenticate with 00:17:c5:ea:4a:d9
Nov 22 02:19:56 TB15-NTA1000 kernel: wlan0: send auth to 00:17:c5:ea:4a:d9 (try 1/3)
Nov 22 02:19:56 TB15-NTA1000 kernel: wlan0: authenticated
Nov 22 02:19:56 TB15-NTA1000 kernel: iwlwifi 0000:0a:00.0 wlan0: disabling HT/VHT due to WEP/TKIP use
Nov 22 02:19:56 TB15-NTA1000 kernel: wlan0: associate with 00:17:c5:ea:4a:d9 (try 1/3)
Nov 22 02:19:56 TB15-NTA1000 kernel: wlan0: RX AssocResp from 00:17:c5:ea:4a:d9 (capab=0x411 status=0 aid=1)
Nov 22 02:19:56 TB15-NTA1000 kernel: wlan0: associated
Nov 22 02:19:56 TB15-NTA1000 kernel: IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
Nov 22 02:19:59 TB15-NTA1000 ntpd[2055]: Listen normally on 13 wlan0 fe80::215:ff:feb9:9baf UDP 123
Nov 22 02:20:01 TB15-NTA1000 dhclient[7543]: DHCPREQUEST on wlan0 to 255.255.255.255 port 67 (xid=0x4cf81706)
Nov 22 02:20:01 TB15-NTA1000 dhclient[7543]: DHCPACK from 2.2.2.2 (xid=0x4cf81706)
Nov 22 02:20:03 TB15-NTA1000 NET[7612]: /sbin/dhclient-script : updated /etc/resolv.conf
Nov 22 02:20:03 TB15-NTA1000 dhclient[7543]: bound to 2.2.2.176 -- renewal in 35982 seconds.
Nov 22 02:20:05 TB15-NTA1000 ntpd[2055]: Listen normally on 14 wlan0 2.2.2.176 UDP 123
Nov 22 02:20:05 TB15-NTA1000 ntpd[2055]: 209.242.224.117 interface 10.200.0.55 -> 2.2.2.176
Nov 22 02:20:05 TB15-NTA1000 ntpd[2055]: 97.107.129.217 interface 10.200.0.55 -> 2.2.2.176
Nov 22 02:20:05 TB15-NTA1000 ntpd[2055]: 208.53.158.34 interface 10.200.0.55 -> 2.2.2.176
Nov 22 02:20:05 TB15-NTA1000 ntpd[2055]: 66.228.59.187 interface 10.200.0.55 -> 2.2.2.176
Nov 22 02:20:06 TB15-NTA1000 ntpd[2055]: 0.0.0.0 0618 08 no_sys_peer
Nov 22 02:22:34 TB15-NTA1000 nfsidmap[7804]: nss_getpwnam: name 'nobody@eng.sonicwall.com' does not map into domain 'localdomain'
Nov 22 02:22:34 TB15-NTA1000 nfsidmap[7809]: nss_getpwnam: name 'root@eng.sonicwall.com' does not map into domain 'localdomain'
Nov 22 02:26:25 TB15-NTA1000 kernel: imklog 5.8.10, log source = /proc/kmsg started.
Nov 22 02:26:25 TB15-NTA1000 rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="1713" x-info="http://www.rsyslog.com"] start
Nov 22 02:26:25 TB15-NTA1000 kernel: Initializing cgroup subsys cpuset
Nov 22 02:26:25 TB15-NTA1000 kernel: Initializing cgroup subsys cpu
Nov 22 02:26:25 TB15-NTA1000 kernel: Initializing cgroup subsys cpuacct
Nov 22 02:26:25 TB15-NTA1000 kernel: Linux version 3.10.75-1.el6.elrepo.x86_64 (mockbuild@Build64R6) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) ) #1 SMP Sun Apr 19 11:48:43 EDT 2015
Nov 22 02:26:25 TB15-NTA1000 kernel: Command line: ro root=UUID=0e1a1bcd-25fa-4106-9bcb-d73f88d9de13 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet crashkernel=auto net.ifnames=0
Nov 22 02:26:25 TB15-NTA1000 kernel: e820: BIOS-provided physical RAM map:
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x0000000000000000-0x000000000009a7ff] usable
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x000000000009a800-0x000000000009ffff] reserved
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x0000000000100000-0x00000000bb77ffff] usable
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x00000000bb780000-0x00000000bb78dfff] ACPI data
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x00000000bb78e000-0x00000000bb7cffff] ACPI NVS
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x00000000bb7d0000-0x00000000bb7dffff] reserved
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x00000000bb7ed000-0x00000000bfffffff] reserved
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x00000000fed20000-0x00000000fed3ffff] reserved
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
Nov 22 02:26:25 TB15-NTA1000 kernel: BIOS-e820: [mem 0x00000000ffa00000-0x00000000ffffffff] reserved
补充一下啊，不一定是死机，也有可能是网络服务出现了什么问题，我是远程访问这台机器的，当时就是ssh和vnc都登不上了，然后过了几分钟，我用上下电进行了硬重启，所以才再连上的。。。。
好吧，我自己回答，是默认路由被冲掉了。。