Pass PPPoE IP to client on different Ethernet Port

RouterOS General
1

I have been asked if it is possible to pass a public ip through to host inside a network to avoid NAT’ing ?

Some ADSL and VDSL routers can do this and call it half bridge mode.

Any idea’s are welcome :slight_smile:

2

Yes it is possible.

Here are some of the basics things to do in winbox (I am posting this on the assumption that you have 2 public IP from your provider)

Assign your client the static IP from your provider

  1. Interfaces - Remove the interface the public device is connected to from the switch (master port NONE)
  2. Addresses - Do not assign an address to the interface for the public device (For security)
  3. Firewall NAT - Action Pass Through source is your static IP (set this rule as top priority using action pass through instead of masquerade will acheive the desired result)
  4. Firewall Filter Rules - Configure accordingly to protect that exposed device

I would need more information in order to be more specific.

3

Hi tws101 or any other can help,

I have the same requirement as scampbell’s post. I have two IPs from PPPoE. First one I do the NAT for office computer to use (I manage to do it). The second IP I would like to pass it to my server to use. Can you let me know how to do it in Winbox. Thanks.