I’d like to request support for assigning one or more secondary IPv4 addresses (IP aliases) to the WAN interface.
This is a common requirement for cable modem management, particularly with DOCSIS modems such as the Hitron CODA56 used by Spectrum. The modem’s management interface is available at 192.168.100.1, but when the WAN interface has only a public IP address, there is no way to communicate with the modem from the LAN.
The standard solution used by routers such as pfSense and OPNsense is to:
- Assign a secondary IP address (for example, 192.168.100.2/24) to the WAN interface.
- Create a Source NAT (SNAT) rule that translates traffic destined for 192.168.100.1 to originate from 192.168.100.2.
Route10 already supports Source NAT, but there is currently no way to assign a secondary IP address to the WAN interface, which prevents this configuration.
Requested functionality:
- Support multiple IPv4 addresses on a WAN interface.
- Allow secondary/alias IP addresses to be selected as the Source NAT translation address.
- Optionally support multiple aliases per interface for advanced routing and NAT scenarios.
This feature would enable access to bridged cable modem management interfaces without requiring a second router or temporarily connecting a computer directly to the modem. It would also support additional enterprise and advanced networking use cases that require multiple IP addresses on a single WAN interface.