GRE Forwarding

RouterOS General
1

Hello
I have a RB750G, upgraded to v.5.14

I also have a cisco router to manage GRE tunnel between another Cisco on the Internet.

Installed RB750 to as a gateway, NAT etc. Internet working on Local Network.

GRE Tunnel of the internet side is 181.A.B.C

RB750 Internet IP 88.A.B.C

Internal network use 10.0.0.0/24 IP Block

Internal Cisco router IP 10.0.0.11

The cisco setups are done,
I need to forward GRE packets between 10.0.0.11 and 181.A.B.C

How can I define IP Firewall NAT rules for this scenario

Thank you.

2

I am not sure this answers your question… assuming you wanted to port forward all GRE traffic from your external IP to an internal IP of 10.0.0.10 you would do:

/ip firewall nat add chain=dstnat protocol=gre action=dst-nat to-addresses=10.0.0.10

If you wanted to limit that forwarding to only a single external IP then you could specify the src-address.