[转]***换机房换ip之后不能连外网

***换机房换ip之后不能连外网

时间 2015-07-21 15:17:16  Wendal随笔

原文  http://wendal.net/2015/07/21.html

主题 iptables

昨晚把nutzbook所在的vps换了机房, 自然ip也更换了

然后,突然发现怎么不能ping外网呢?

[root@nutzbook ~]# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
74 packets transmitted, 0 received, 100% packet loss, time 74016ms

[root@nutzbook ~]# ping 114.114.114.114
PING 114.114.114.114 (114.114.114.114) 56(84) bytes of data.
^C
--- 114.114.114.114 ping statistics ---
11 packets transmitted, 0 received, 100% packet loss, time 10547ms

[root@nutzbook ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 venet0
0.0.0.0 0.0.0.0 0.0.0.0 U 0 0 0 venet0

百思不得其解, 唯有找客服, 答复的核心就是一句iptables命令

iptables -F; iptables -t nat -F; iptables-save > /etc/sysconfig/iptables

即清除老的转发规则,神奇了,为啥会有呢, 搞不清楚了…