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RVS4000 problems with RIP and port forwarding

Hi,

I have RVS4000 configured to listen to multiple IP on WAN side.For this to work my config is like this:

WAN

WAN holds the "routing" segment 11.22.33.44/31 of my public IP subnet

WAN IP static: 11.22.33.46

WAN gateway: 11.22.33.45

LAN

Lan holds the first IP of my public IP subnet 11.22.33.16/28

LAN IP static: 11.22.33.17

LAN subnet: 255.255.255.240

Everything else under LAN settings is empty.

Advanced Routing

Here I have:

Operation Mode: ROUTER

RIP: ENABLED

RIP Send Packet Version: RIPv2

RIP Rcvd Packet Version: RIPv2

So, practically I have LAN side configured with public IP and no NAT between WAN and LAN side.

PROBLEM here is "single Port Forwarding", for example:

1.) I have 2 mail servers behing RVS4000, so I want to open port 25 on 2 IP addresses...but I can't! Cisco says, that 2 rules of port forwarding are the same and does not accept one of them. Any idea?

2.) Some single port forwarding rules simply do not work?! Straight forwarding a port xx to xx works, but from port xx to YY does not...or it does, until I add another rule. Meaning, that if at some moment all port forwardings work, they may NOT work after I add another rule.

Any idea....except of buying at least 800 series?

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