How to configure a Cisco router for internet access | 2022
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In this video, I explain how to configure a Cisco router with DHCP on the ISP side for the first time.
Majority of the ISPs are giving out dynamic IPs for home or small business users unless you request a static IP. In my another video • How to configure cisco router for the...
Howver, due to the request I Recorded this video too, which shows how to configure the Cisco router public interface for the ISP that gives the IP dynamically using the DHCP service.
I show how to configure interfaces, NAT, Routing, DHCP, and ACLs.
I use a virtual router, workstation, and virtual ISP to demonstrate the configuration.
-- TIMESTAMPS --
00:00 how to configure a Cisco router for the first time.
00:37 Explaining the topology
02:08 How to configure router interfaces (DHCP Client)
07:24 How to check the routing table and ping the internet
09:05 How to configure inside interface (Static IP)
11:15 How to tell if IP was assigned statically or using DHCP
12:18 How to configure a DHCP Server
17:16 Check if a computer can get the IP address from DHCP Server
21:10 How to configure Network Address Translation (NAT)
35:00 How to configure authentication (AAA)
40:42 How to configure and use ssh instead of telnet
47:33 How to protect management access (ACL on SSH)
54:40 How to configure an access list on the outside interface
-------------------- !!! WARNING!!! --------------------
You need to add an additional line in the outside ACL to allow DHCP packets which I forgot to mention in my video.
Here is the line:
permit udp any eq bootps any eq bootpc
so the actual ACL looks like this:
ip access-list extended OUTSIDE_FILTER_IN
5 permit udp any eq bootps any eq bootpc
10 permit tcp any host 12.34.56.100 established
20 permit icmp any host 12.34.56.100 echo-reply
30 permit udp host 8.8.8.8 eq domain host 12.34.56.100
40 permit udp host 1.1.1.1 eq domain host 12.34.56.100
