Take a look at an ACL's (Access Control List) on your router/router's. You may see an entry that blocks ICMP from the outside as most companies do. For example, if you do an nslookup for google.com you get 188.8.131.52. Google allows you to ping this address. If you do an nslookup for microsoft.com you get 184.108.40.206. Microsoft doesn't allow you to ping this address.
Numbered ACL's do not allow you to remove just a single line. You would want to copy the entire ACL into notepad and then make your changes in notepad. Delete the ACL from the router and paste the new modified ACL from notepad. If you just tried to paste the modified ACL from notepad thinking it would overwrite the current ACL, the new lines would be added to the end of the current ACL.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...