A summary of the network tumbling problem of ping problem

2014.06.24 night the newly installed virtual machine ping Problem Summary:

Connect:network is unreachable

Ping:unknown Host Www.qq.com

I don't know what to do most of the time.

[[email protected] ~]# Ping www.163.com

PING 163.xdwscache.glb0.lxdns.com (61.179.107.52) bytes of data.

Bytes from 61.179.107.52:icmp_seq=1 ttl=50 time=33.0 ms

Bytes from 61.179.107.52:icmp_seq=2 ttl=50 time=33.3 ms

Bytes from 61.179.107.52:icmp_seq=3 ttl=50 time=32.6 ms

Bytes from 61.179.107.52:icmp_seq=4 ttl=50 time=32.5 ms

---163.xdwscache.glb0.lxdns.com ping statistics---

4 packets transmitted, 4 received, 0% packet loss, time 3000ms

RTT Min/avg/max/mdev = 32.520/32.910/33.392/0.335 ms

[[email protected] ~]# Ping www.qq.com

PING www.qq.com (182.254.8.146) bytes of data.

Bytes from 182.254.8.146:icmp_seq=1 ttl=53 time=73.4 ms

Bytes from 182.254.8.146:icmp_seq=2 ttl=53 time=48.6 ms

Bytes from 182.254.8.146:icmp_seq=3 ttl=53 time=52.3 ms

Bytes from 182.254.8.146:icmp_seq=4 ttl=53 time=48.3 ms

Bytes from 182.254.8.146:icmp_seq=5 ttl=53 time=50.7 ms

Bytes from 182.254.8.146:icmp_seq=6 ttl=53 time=47.7 ms

---www.qq.com ping statistics---

6 packets transmitted, 6 received, 0% packet loss, time 5001ms

RTT Min/avg/max/mdev = 47.758/53.552/73.419/9.023 ms

[[email protected] ~]# Ping www.baidu.com

PING www.a.shifen.com (119.75.218.77) bytes of data.

Bytes from 119.75.218.77:icmp_seq=1 ttl=57 time=5.25 ms

Bytes from 119.75.218.77:icmp_seq=2 ttl=57 time=4.82 ms

Bytes from 119.75.218.77:icmp_seq=3 ttl=57 time=19.1 ms

Bytes from 119.75.218.77:icmp_seq=4 ttl=57 time=4.64 ms

Bytes from 119.75.218.77:icmp_seq=5 ttl=57 time=2.91 ms

---www.a.shifen.com ping statistics---

5 Packets transmitted, 5 received, 0% packet loss, time 4003MS

RTT Min/avg/max/mdev = 2.914/7.357/19.146/5.948 ms

[[email protected] ~]# Ping www.baidu.com

Ping:unknown Host Www.baidu.com

[[email protected] ~]# Ping www.baidu.com

Connect:network is unreachable

Bridge the date time synchronization of the virtual machine to pay attention to whether it is normal, has been shut down, after the restart to pay attention to observe!

Workaround:

[[Email protected] yum.repos.d]# Date

201465:11:17 CST

[Email protected] yum.repos.d]# lang=en

[[Email protected] yum.repos.d]# Date

Wed June 02:11:22 CST 2014

This article is from "Try to be brave" blog, declined reprint!

A summary of the network tumbling problem of ping problem