The difference between the two is that the first command is not concerned with what direction the traffic is coming from (inside, outside, sideways). It will figure out what interface it came in on and going out off and nat accordingly. The second nat command is concerned with what interface you have configured as inside and outside and will translate based off of those configurations. For example:
With "ip nat source list 100 interface f0/0 overload":
ip nat enable
ip nat enable
With "ip nat inside source list 100 interface fa0/0 overload":
ip nat outside
ip nat inside
I still use the older configuration of "ip nat inside" most times. There is one other differnence, and that's the way that you see the translations. The "ip nat source" command will create an NVI interface. To see translations, you would do:
show ip nat translations (for ip nat inside source command)
show ip nat nvi translations (for ip nat source command)
So there is a difference. The "ip nat source" is considered easier because you don't have to take into account which direction interfaces may be receiving traffic in. You can have two outside interfaces, one inside, or five inside interfaces and two outside. With the "ip nat enable" command on those interfaces, the router does the work...
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...