Re: DHCP Forwarding and Access Lists-Catalyst 3550
Don't forget that when your system boots up, it doesn't have an IP address. Therefore, when you restrict the incoming packets on the VLAN interface to the subnets behind it, the packets that don't have allowed IPs will be blocked before the helper relay function occurs. When the system boots and looks for a DHCP server, the packet source IP address is 0.0.0.0 and the destination packet is 255.255.255.255. That's why the two lines provided:
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...