enable
configure terminal
no ip domain-lookup
hostname R3
banner motd #Unauthorized access prohibited#
username R2 password 123
username R4 password 456

int g0/0
ip address 203.0.113.18 255.255.255.248
no shut
int g0/1
ip address 203.0.113.25 255.255.255.252
no shut
int g0/2 
ip address 203.0.113.1 255.255.255.240
no shut
end
copy running-config startup-config