How to configure cisco 2921 to a new provider?

Question

Computer networks

The provider is changing in the office, the question arose about reconfiguring the cisco 2921 router. As I understand it, you just need to change the ip of the old provider (rostelecom) to the ip of the new one (flex), but on the interface where the Rostelecom patch cord comes in, there is no ip address and there is the Internet. When a flex patch cord is inserted into this interface, the Internet and all ip nat routes disappear. Tell me what can be done and how?

Answer 1

Now it remains to do a few things:
1. Check with the provider for the type of connection.
2. If this is pppoe, then you need to find out the new connection parameters, such as:
ppp chap hostname 708650_R
ppp chap password 0 5axwUоza
ppp pap sent-username 708650_R password 0 5axwUоza
3. If the connection type is ethernet, then remove the pppoe settings from the gigabit0/2 interface and register ip or get it via dhcp + hang up ip nat outside
4. Do not forget to change the default route and NAT settings.
you need to look for ip route 0.0.0.0 0.0.0.0 and ip nat inside source and correct it for the new provider