3COM ADSL Firewall Router

I am having difficulty in configering a 3CRWE754G72-A, it could be i
am misunderstanding how the unit passes the IP addresses.......

My ISP has assigned a public IP address, normally the 3Com Router
would hide this address from my local LAN...In my case to enable my
VPN connection to work, i need this public IP address to be passed
through the router and avialable at on of the Ports ???..

I have tried disabeling the NAT function in the hope of passing though
the IP address, this seems to have little / no effect as the Local IP
address is still reconized.....

Im i misunderstanding something ??

Stephen

In article <(E-Mail Removed) >, "Stephen
Lilly" (E-Mail Removed) says...
> I am having difficulty in configering a 3CRWE754G72-A, it could be i
> am misunderstanding how the unit passes the IP addresses.......
>
> My ISP has assigned a public IP address, normally the 3Com Router
> would hide this address from my local LAN...In my case to enable my
> VPN connection to work, i need this public IP address to be passed
> through the router and avialable at on of the Ports ???..
>
> I have tried disabeling the NAT function in the hope of passing though
> the IP address, this seems to have little / no effect as the Local IP
> address is still reconized.....
>
If a firewall separates two hosts that uses IPSec to secure the
communication channel, the firewall must be configured to open the
following ports:

1. TCP port 50 for IPSec Encapsulating Security Protocol (ESP)
traffic

2. TCP port 51 for IPSec Authentication Header (AH) traffic

3. UDP port 500 for Internet Key Exchange (IKE) negotiation
traffic

An example:

Assume we have a server on the LAN side with an IP address of
192.168.1.10. The LAN address of the router is 192.168.1.3 and the WAN
IP address of the router is 82.58.10.10.

1. To access the router configuration interface, open a browser
and type the following IP Address 192.168.1.3.

2. Click on “Firewall” make sure it is enabled then click on
“Virtual server”.

3. In the designated area enter the last octet of the ip address
of the server in our example it will be “10”.

4. Tick "TCP" and type in the LAN and Public port i.e. the port
number “50”.

5. Go to the next line and type the last octet of the server
which is “10”.

6. Tick "TCP" and type in the LAN and Public port i.e. the port
number “51” .

7. Go to the next line (3rd) and type in the last octet of the
server ip address which is “10”.

8. Tick "UDP" and type in the LAN and Public port i.e. the port
number “500”.


The above setup on the router will allow VPN packets to passthrough.