Due to inactivity, your session will end in approximately 2 minutes. Extend your session by clicking OK below.

Due to inactivity, your session has expired. Please sign in again to continue.

2025-05-14 22:41:52.854

Arris NVG558 Router - Configure IP Passthrough

Here's how to configure IP passthrough on your NVG558 router.
The Gateway can pass all incoming traffic to a specific LAN-side client.
Because both the Gateway and the passthrough host use the same IP address, the Gateway rejects new sessions that conflict with existing sessions. If two tunnels go to the same remote endpoint, such as a VPN access concentrator, the first one to start the IPSec traffic will be allowed; the second one, because it is indistinguishable from the WAN, fails.
  1. Sign in to the Admin WebGUI then click the
    Firewall IP Passthrough
     link.
    You must be connected to the network to access the admin page.
  2. Click
    Passthrough
     from the 'Allocation Mode' dropdown menu.
  3. Choose how the Gateway assigns the public IP address to the passthrough client from the 'Passthrough Mode' dropdown menu:
    • DHCPS-dynamic
      : Assign to the first client gateway to renew its DHCP lease, if the public IP address is available. No further configuration of the passthrough mode is required.
    • DHCPS-fixed
      : Choose the gateway. If the gateway has already connected, find and click the gateway address in the Choose from List field. If the gateway has not connected, you may type its hardware (MAC) address in the Manual Entry input field.
    • Manual
      : Manually assign the public IP address and the service provider's network mask and default gateway values to the client gateway on the network. No further configuration of the passthrough mode is required.
      Requires statically configuring your PC. You configure the TCP/IP Properties of the LAN client PC you want to be the IP Passthrough client. Then manually enter the WAN IP address, gateway address, etc. to match the WAN IP address information of your ARRIS gateway. This mode works the same as the DHCP modes; unsolicited WAN traffic will get passed to this client. The client is still able to access the Gateway and other LAN clients on the 192.168.254.x network, etc.
  4. Enter an optional custom passthrough lease time in the 'Passthrough DHCP Lease' fields.
  5. Click
    Save
    .
    Changes take effect upon restart.