Ping response on CUCM 6 server

[rynard.coetzee]

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 ?

[Rob Huffman · Accepted solution]

Hi Rynard,

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

http://www.cisco.com/en/US/products/products_security_advisory09186a008080f17b.shtml#@ID

Hope this helps!

Rob

[rynard.coetzee]

Thanks Rob ,was getting a bit worried there.

[Rob Huffman]

Hey Rynard,

You are most welcome. Always better "safe than sorry" my friend!

Cheers!

Rob