Hi guys ,i have a problem on my CUCM6 server where if you ping the server from anywhere on the network it replies to 5 pings and then drops 1 consistently. Although if i ping anything else on the same lan as the CUCM servers it is fine. This is happening with all 3 my CUCM6 servers ,any ideas what this could be ?
This is working as designed :)
ICMP rate limiting is used to prevent ICMP Echo Request Flood Denial of Service attacks like documented here;
Cisco Security Advisory: Multiple Cisco Unified CallManager and Presence Server Denial of Service Vulnerabilities
Hope this helps!