Network issue while connecting linux server

When we connect linux server in intermet that time my all office network goes down we have changed ip address also I m not able to find out the issue pls help me asap

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1-connect only local nic port and chk,if it working properly then
2-connect 2nd nic port and chek again.
Do this for identify which nic port is having issue.

Also check if this server is having live ip then block all open port in iptables.

One more thing.
Check broadcasting and subnet of given ip

cent os 5.5 network issues

I am having network issues with cent os 5.5 64 bit, it unable to detect lan card. it working while running ubuntu 12.04

ISSUE: atheros ar8132 /l1c drivers for cent os

I have tried  below link but no luck

http://elrepo.org/tiki/tiki-index.php

http://pagesofinterest.net/blog/2010/11/atheros-drivers-in-a-repository/

Kindly help me out.

Thanks in advance

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Have you installed CentOS as a virtual machine or a physical installation.

If as a virtual machine then there is some setting you need to check in VMware

 

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Which linux version are you installing and what is system config

 

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Either you have to update the kernel or get migrated from 5.5 to 6.* version of Cent linux. Well a good news is rhel / cent just have came up with 7.0 version you can work that to

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Same issue i faced in my office environment. 

I am assuming u r installed CentOS 5.5 on vmware Workstation.

CentOS 5.5 is doesn't have  drivers for vmnic (Nic for vm).

Two solutions for this,

1) Select proper OS and distribution on Workstation .

2) install vmware tools for that VM.

This are two solutions we came across

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Done kernel compilation issue resolved...

@vikas thx.

Packet drop in ifconfig command

I am facing an issue in ifconfig command in rhel5.4 SERVER.

it is seen in tcpdump command that kernel is dropping the packets.

What my be the issue. Is it network related or OS related issue.

histsize and networking path

in which the following options are there? tell me the path

1)histsize

2)networking(yes or no)

i need above files path .....i mean in which of the files we use above options

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we can change history size 

# vi /etc/profile

make changes in this file

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For networking u can use this path:-   /etc/sysconfig/network

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1)histsize

HISTSIZE is the number of lines or commands that are stored in memory in a history list while your bash session is ongoing.

HISTFILESIZE is the number of lines or commands that (a) are allowed in the history file at startup time of a session, 
            and (b) are stored in the history file at the end of your bash session for use in future sessions.



2)networking(yes or no)
[root@testserver ~]# cat /etc/sysconfig/network
NETWORKING_IPV6=yes
HOSTNAME=testserver

Many of the rpc/nfs related init scripts require NETWORKING=yes to be present for the scripts to successfully launch. 
Those scripts work just fine with an /etc/sysconfig/network which looks like this: