NAT Loopback

RouterOS General
1

Have a Mikrotik router doing PPPoE and uPNP for some services mainly webcams. Is there a way to enable NAT Loopback on Mikrotik?

2

Basically I want it when an internal NATed user connects to there outside public IP there traffic is looped back to any internal DST-NAT rules such as cameras. Most home routers support this automatically.

http://opensimulator.org/wiki/NAT_Loopback_Routers

So how do this on Mikrotik?

3

http://wiki.mikrotik.com/wiki/Hairpin_NAT

4

Actually I think I figured this out. I have one masquerade rule with PPPoE interface as outgoing interface. I have a 2nd masquerade rule with the internal interface as outgoing. Seems to work now. Seems to simple?

5

Hi can you explain more specific on your configuration. I have the same issues, the different thing is, i’m using it for our email server.

We have a dyndns for our email server. So the configuration for incoming and outgoing email on MS Outlook are using the dyndns. For user that connect in our local LAN will not received any email, and there will be no issues if the user is outside from our local LAN.

‘I have one masquerade rule with PPPoE interface as outgoing interface.’ - This part i understand

I have a 2nd masquerade rule with the internal interface as outgoing. - This part i’m a little bit lost.

FYI, my configuration on the masquerade with PPPoE

/ip firewall nat
add chain=srcnat out-interface=WAN1 action=masquerade

Appreciate your input on these. Thanks.