Ubuntu server 12.04 creating broadcast on network

Hi all,

I have installed fresh Ubuntu 12.04 server 64Bit and configured network interface with static IP. After allowing Internet access and NAT it to public IP then it is creating broadcast on network and whole network is getting down. Can some one help me with this.

Thanks & regards,
syinfraSenior Deputy ManagerAsked:
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The external interface is in the same switch with the LAN interface?
syinfraSenior Deputy ManagerAuthor Commented:
Here I'm providing some more info...
This is a virtual machine running on Vmware. Because of this our internet is getting down not network.
Zephyr ICTCloud ArchitectCommented:
You will need to provide some more info, what is the role of the Linux server? How is it's network configured, can you provide screenshots or something? What kind of broadcast are we talking about, what's the traffic, how did you come to the conclusion?
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check the smtp broadcasting and try to stop it or close port

Manmeet BhatnagarCommented:

Few points you need to check first. This server is on public IP, might be compromised.

1. Check for user accounts, if these have weak passwords/usernames such as test/test123,admin/admin123,root,root@123,etc.

2. What service your are running on this server, like it's apache, squid, mysql, etc.

3. Now look for the current "ESTABLISHED" connection by running below command.
    #netstat -antulp|grep ESTAB
    Check if number of connections are high and Destination IPs are from different   location of the globe means something is wrong there.

4. If 3rd point work then follow this one as well -
   while running netstat you'll be able to see some "PIDs" Process ID.
   #pmap <PID>|less
Now look for the location for file/code put to run these connections.

Once done please update, if it doesn't work and on the same server "LAMP" is running and SMTP is enabled then we can test the other scenario as well.


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By broadcast you mean switching loop?
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