From: hadi motamedi <motamedi24 at gmail.com> >Please be informed that I have set an secondary IP address on my CentOS server to be able to reach to another Intranet , as the followings: >#ifconfig eth0:1 172.18.209.1 netmask 255.255.0.0 up >But I am not aware if any other node on the new Intranet is making use of this IP address . Can you please do me favor and let me know how can I check if any IP conflict occured ? Why not ask the System Administrator if this IP is available? JD