HI in our LAN we find a weird issue. Our ip range is 172.20.48.0 /20, when to try to ping any ip address from the pc it resolves to ips in the network range 172.20.62.x or 63.x and the MAC address for those IPs seems to be same, i have attached the screenshots of the same, pls help me to find out is that spoofing attack and how to resolve this issue....
Hi all thanks for the replies, the issue is sorted out, i handle cisco NAC implemetation in my office. Since there was a looping issue caused by NAC few weeks back all ppl were suspecting that Cisco NAC clean access server was the issue. Actually the issue is in the 172.20.48.0/20 network we have our core switch as our gateway 172.20.48.1 in that for a particular host range 172.20.55.1 - 200 lies a project that needs internet access to connect the vpn clients.
So our network engg configured a source based routemap to redirect the mentioned ips to internet firewall... and also the securities guys have configured a nat pool for some the home user who connect to our office as 172.20.63.x
So whenever i started pinging from the hosts in 55 network we were getting replies from 63 network,, thats the issues....
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