CentOS 6.5 互联网问题故障排除

CentOS 6.5 互联网问题故障排除

我有一台CentOS 6.5在远程位置运行的服务器,我通过路由器上的端口转发使用 SSH 访问该服务器。

一切都工作正常,直到今天我发现我无法再从服务器访问互联网。

我仍然可以通过远程 SSH 连接到它,它仍然有静态 IP 地址、网关等,我只是无法使用互联网。

如果我在另一台计算机上使用服务器以太网电缆,则可以正常访问互联网

但如果我尝试 ping 我会立即收到错误

# ping google.com
# ping: unknown host google.com

有没有人有任何建议的步骤来找出原因?

**

文件内容/etc/resolv.conf

; generated by /sbin/dhclient-script
search DOMAINNAME.LOCAL domainname.local
nameserver 192.168.2.9
nameserver 192.168.2.16

文件内容/etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE="eth1"
BOOTPROTO="static"
HWADDR="34:40:B5:89:85:BE"
IPADDR=192.168.2.45
NETMASK=255.255.255.0
GATEWAY=192.168.2.254
DNS1=192.168.2.9
DNS2=192.168.2.16
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"
UUID="bde2561c-9882-4e50-9e3a-22e44f6a5005"

的结果nslookup google.com 192.168.2.9

;; connection timed out; trying next origin
;; connection timed out; trying next origin
;; connection timed out; no servers could be reached

的结果nslookup google.com 192.168.2.16

;; connection timed out; trying next origin
;; connection timed out; trying next origin
;; connection timed out; no servers could be reached

的结果nslookup google.com 8.8.8.8

;; connection timed out; trying next origin
;; connection timed out; trying next origin
;; connection timed out; no servers could be reached

的结果nslookup google.com 8.8.4.4

;; connection timed out; trying next origin
;; connection timed out; trying next origin
;; connection timed out; no servers could be reached

的结果netstat -rn

197.81.19.48    0.0.0.0         255.255.255.248 U         0 0          0 eth0
10.254.254.0    0.0.0.0         255.255.255.0   U         0 0          0 as0t0
192.168.2.0     0.0.0.0         255.255.255.0   U         0 0          0 eth1
169.254.95.0    0.0.0.0         255.255.255.0   U         0 0          0 usb0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth1
0.0.0.0         192.168.2.254   0.0.0.0         UG        0 0          0 eth1

答案1

您的主机路由表在服务器上是什么样子的?

netstat -rn

听起来您有基于本地主机的路由问题。 SSH 的端口转发仍然有效,因为它与您的服务器有本地连接。

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