How to configure cisco router 1841

How to configure cisco router 1841 can access to internet

Please See network infrastructure 

I. Configure DHCP

Router>
Router>en
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#ip dhcp pool 192
Router(dhcp-config)#network 192.168.1.0 255.255.255.0
Router(dhcp-config)#default-router 192.168.1.1
Router(dhcp-config)#dns-server 8.8.8.8
Router(dhcp-config)#exit

II. Apply DNS

Router(config)#ip name-server 118.222.222.222

Router(config)#ip name-server 192.168.100.10

III. Configure Route And Default-Gateway

Router(config)#ip route 0.0.0.0 0.0.0.0 115.31.180.16

Router(config)#ip route 192.168.1.0 255.255.255.0 115.31.180.16

Router(config)#ip default-gateway 115.31.180.16

IV. Apply IP on each interface

Router(config)#int f0/0

Router(config-if)#ip add 115.31.180.2 255.255.255.240

Router(config-if)#no sh

Router(config-if)#ip nat outside

Router(config)#int f0/1

Router(config-if)#ip add 192.168.1.1 255.255.255.0

Router(config-if)#no sh

Router(config-if)#ip nat inside

V. Create Access List (NAT)

Router(config)#access-list 7 permit 192.168.1.0 0.0.0.255

Router(config)#ip nat inside source list 7 interface fastethernet 0/0 overload

Test (For telnet service)

Create User and Login

Router(config)#username phanny privilege 15 secret phanny

Router(config)#line vty 0 4

Router(config-line)#privilege level 15

Router(config-line)#login local

Router(config-line)#exit

So, after you login router will required you to fill in username and password.

But if you use only command Router(config-line)#login when you telnet you will

required only password in line vty (123). Example:

Router(config)#line vty 0 4

Router(config-line)#privilege level 15

Router(config-line)#password 123

Router(config-line)#login 

Router(config-line)#exit

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