How to change WAN IP address on Juniper SSG5

How to change WAN IP address on Juniper SSG5

in our example, our client is changing his ISP from Comcast to AT@T. Out goal is changing the new WAN IP address on the Juniper SSG5 without changing any inside private IP addresses and network configuration.

1. Open SSG from web browser, for example, http://10.0.0.2:8080.

2. Navigate to Network>Interface>List.

3. In our example, bgroup0 and all ethernet0/2 to 0/6 are LAN ports. The ethernet0/0 is for WAN connecting to the AT@T modem.  Other ports are not used. Click Edit on the ethernet0/0.

4. In the Properties of Basic, make sure the Zone Name is Untrust. Enter the ATT IP address to replace Comcast IP address. Make sure you have correct /#. For more information about /#, please check this link: IPv4 Subnet Chart. Click Apply to save the settigns.

5. If you have port forwarding, please click VIP to check the new IP address is correct and all forwarding configuration is correct.

6. To change the Routing, navigate to Network>Routing>Destination. Click Remove on the Comcast IP.

7. Then click New on the top right. Enter 0.0.0.0 /0 for IP Address/Network since we want to access the Internet. Enter the AT&T default gateway to replace Comcast gateway IP. Click OK to save the settings.

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8. You may want to change the DNS also. Click DNS>Host under Network. Make the change accordingly.

9. You may need to reboot the Juniper SSG5 to take the new configuration.