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i'm new to this board, and first, excuse me for my bad english.

so i've the following scenario.

Client -> Server -> Internal Sever

Kerio WinRoute Firwall is running on the Server.

The Client has the IP-Address (modified)
The Server has two NICs and three IP-Addresses:
NIC 1:
NIC 1:
NIC 2:

The internal Server has the IP-Address The Client must access this server. Both ICMP and a port-based Application must be available.

The Client sends a request to The Server accepts this request and WinRoute does DNAT & SNAT.
Dest. :
Service Any
Source NAT: Translate IP address to outgoing IF
Dest. NAT : Translate to

The Client could access the port-based Application on the internal Server, but ICMP doesn't work. Why ?
I've checked the traffic with ethereal on the internal Server. Once, the Client sends a port-based request, the 172* IP-Addresses translated correctly.
But when the Client sends an ICMP request, only the destination IP will be translated to and the source IP is still
So, next point, the Internal Server does not have a default GW, and also should not have one, so it doesnt know where to send the icmp packet when the source is How can i tell WinRoute also make SNAT on ICMP packets?

Thanks for your replys,


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