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Changing external IP address on Cisco 1921 Router

Posted on 2016-11-16
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Last Modified: 2016-11-16
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?
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Question by:Nitsan Reznik
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jmac44 earned 2000 total points
ID: 41890411
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
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