Whether you're looking to use a third party router or troubleshoot possible connectivity issues, IP Passthrough allows you to assign a public IP address to a device connected to your Cisco modem, effectively bypassing the Cisco's internal router. Follow these instructions to set up the IP Passthrough feature on a Cisco DPC3848V Docsis 3.0 modem.
Did You Know
Once IP Passthrough is enabled for a connected device, that device will no longer be able to access the Cisco GUI (default 192.168.0.1) as it is operating outside of the Cisco's DHCP service. Only the defined device will receive a public IP address, all other devices connected to the Cisco (via Ethernet or WiFi) will receive internal IP addresses (i.e., 192.168.0.X).
The IP Passthrough configuration activates similar to “Bridge” mode functionality on supported equipment but this time only for specific devices, which could be connected by Wireless for example. Similar functionality isn’t possible in pure Bridge mode.).