Solution to linux Nic packet loss or disconnection

Source: Internet
Author: User

Recently, my company thought it was a network problem or a data center problem when a packet loss problem occurred on its website. after a long time of troubleshooting, I found that the linux network card was out of the package. Let's share my solution.


In the past, the company's system often experienced packet loss due to network card problems (packet loss exclusion factors) or sudden failure,

It seriously affects the normal provision of services, so we want to automatically solve this problem when it occurs.

Train of Thought: Check the packet loss status of the NIC, or use ping detection. If yes, restart the NIC. It's easy!

The Code is as follows:

The Code is as follows: Copy code
# Installation help: mkdir/cyc
#/Cyc/renetwork. log is a log file

#! /Bin/bash
#2013-2-17 @ man
# Ping timeout restart network
# Lastmodtime 2013-3-19
PingNetwork (){
Local c = $1
Local pcount = $2
Local dst = 192.168.0.143 # modify the ip address of your Interactive Machine or router
If [[! $ Pcount = ~ ^ [0-9] + $]; then
Pcount = 5
Fi
Loss = 'Ping-c $ pcount $ dst | grep loss | awk '{print $6}' | cut-d %-f 1'
If [[! $ Loss = ~ ^ [0-9] + $]; then
Loss = 100
Fi

If [$ loss-gt 0]; then
Ifdown $ c
Sleep 3
Ifup $ c
Echo 'date "+ % Y % m % d % T" '": $ pcount ping $ loss % loss">/cyc/renetwork. log
Sleep 30
Fi

}

# Start dst eth
StopEth (){
Local c = $1
Local et = 'service network status | tail-1 | grep "$ c "'

If [x "" = x "$ et"]; then
Ifup $ c
Echo 'date "+ % Y % m % d % T" '": $ c stop">/cyc/renetwork. log
Sleep 30
Fi
}
# Drop found
NetDrop (){
Local c = $1
#$6 RX-DRP
Local redp = 'netstat-I | grep "$ c" | awk 'end {print $6 }''
#$10 TX-DRP
Local txdp = 'netstat-I | grep "$ c" | awk 'end {print $10 }''

If [$ redp-gt 0]; then
Ifdown $ c
Sleep 3
Ifup $ c
Echo 'date "+ % Y % m % d % T" '": $ c RX-DRP drop">/cyc/renetwork. log
Sleep 30
Fi

Sleep 2
If [$ txdp-gt 0]; then
Ifdown $ c
Sleep 3
Ifup $ c
Echo 'date "+ % Y % m % d % T" '": $ c TX-DRP drop">/cyc/renetwork. log
Sleep 30
Fi

}

Wtime = $2
Eth = $1
If [[! $ Wtime = ~ ^ [0-9] + $]; then
Wtime = 3
Fi
If [x "" = x "$ eth"]; then
Echo "please enter the NIC name! "
Exit
Fi
While [1]
Do

StopEth $ eth
Sleep $ wtime
NetDrop $ eth
Sleep $ wtime
PingNetwork $ eth 1

Done
 


The log results of running the program till now are as follows:

The Code is as follows: Copy code
20130319 12: 23: 01: eth0 1 ping 100% loss
20130319 13: 43: 50: eth0 1 ping 100% loss
20130319 18: 11: 18: eth0 1 ping 100% loss
20130323 08: 04: 59: eth0 1 ping 100% loss
20130323 14: 41: 04: eth0 1 ping 100% loss
20130324 12: 49: 04: eth0 1 ping 100% loss
20130327 13: 15: 47: eth0 1 ping 100% loss
20130401 11: 17: 42: eth0 1 ping 100% loss
20130402 09: 02: 14: eth0 1 ping 100% loss
20130403 08: 49: 30: eth0 1 ping 100% loss
20130404 20: 21: 46: eth0 1 ping 100% loss
20130407 18: 44: 57: eth0 1 ping 100% loss
20130408 10: 46: 53: eth0 1 ping 100% loss
20130408 14: 41: 06: eth0 1 ping 100% loss
20130408 14: 47: 24: eth0 1 ping 100% loss
20130408 15: 23: 02: eth0 RX-DRP drop
20130415 08: 30: 09: eth0 1 ping 100% loss
20130415 11: 16: 16: eth0 1 ping 100% loss
20130417 08: 05: 41: eth0 1 ping 100% loss
20130419 08: 04: 19: eth0 1 ping 100% loss
20130419 10: 40: 51: eth0 1 ping 100% loss
20130419 11: 33: 14: eth0 1 ping 100% loss
20130419 19: 03: 03: eth0 1 ping 100% loss
20130421 16: 10: 55: eth0 1 ping 100% loss
20130422 07: 47: 34: eth0 1 ping 100% loss
20130423 07: 15: 07: eth0 1 ping 100% loss
 


Haha, it automatically solves the problem of NIC packet loss or disconnection! Are you so nice!
If you forget to mention it, the program runs in Red Hat Enterprise Linux Server release 5.4 or Centos6.3.
It is estimated that the problem is not serious in other linux environments. We will not test it here!

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