• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 214
  • Last Modified:

Changing external IP address on Cisco 1921 Router

Hi Guys,

We are in a situation where we are going to be moving to a different ISP and therefore, we would need to change our external IP addresses to 4 of our Cisco 1921 routers. Those routers are used only for VPN tunnels for our clients. Is there any suggestion how can we change our current public IP address given below references from our sh run:

interface GigabitEthernet0/1
ip address 78.154.104.3 255.255.255.240
ip default-gateway 78.154.104.14
ip route 0.0.0.0 0.0.0.0 78.154.104.14

can you direct me what are the commands to change the current IP address + gateway IP? Also, apart from sh run, do you think there is anything else I need to check in the router in relation to the external IP change?
0
Nitsan Reznik
Asked:
Nitsan Reznik
1 Solution
 
jmac44Commented:
login with the right privileges
type this:
enable
conf t
interface GigabitEthernet0/1
ip address (new ip) (netmask)
ip default-gateway (new ip)
exit
ip route 0.0.0.0 0.0.0.0 (new ip)
exit
wr - this will save your work

sh interfaces will show detailed information on interfaces
sh ip interface brief will show if the interface is up or down and what the ip is
1
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Become a Leader in Data Analytics

Gain the power to turn raw data into better business decisions and outcomes in your industry. Transform your career future by earning your MS in Data Analytics. WGU’s MSDA program curriculum features IT certifications from Oracle and SAS.  

Tackle projects and never again get stuck behind a technical roadblock.
Join Now