Hi Mikrotik staffa,

can you post more infos on /ip firewall service-port and NAT helpers?

The ROS manual/Wiki is very reduced... http://wiki.mikrotik.com/wiki/IP/Services#Service_Ports

tnx

I'm not Mikrotik staff, but what, specifically, are you looking for?

How to work (internally) this helpers.

You can very likely find the source code for these helper apps by looking at the iptables sources. MT is a linux kernel and the firewall is based on iptables.

You can very likely find the source code for these helper apps by looking at the iptables sources. MT is a linux kernel and the firewall is based on iptables.

Yes, it is true.

But I pay for MT licenses and I would a minimal description of this.

Nat helpers inspects packets and substitutes original addresses in IP payload.