Hello to all.
I get into troubles.
I need to put my "ready to run" server into a private local network in a school, for mail, http... etc.
I asked the Internet Service Provider to forward the needed ports:
22,25,53,80,110,143,465,993,995 to this server.

The server is on the LAN 10.4.46.x with IP adress 10.4.46.2.

I requested the ISP to forward this ports from public static IP 87.147.20.12 to my Local. (server)

They answered something what I don't really understand:

These forwards are active right now on the ISPs cisco router.

ip nat translation tcp-timeout 600
ip nat pool Dynamic 87.147.20.12 87.147.20.12 netmask 255.255.255.248
ip nat pool NATPOOL 87.147.20.12 87.147.20.12 netmask 255.255.255.248
ip nat inside source list 105 pool Dynamic overload
ip nat inside source list NAT pool NATPOOL overload
ip nat inside source static 10.4.46.10 87.147.20.12 extendable
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0


They asked me if I want to remove all of this and make a port redirection from the Public IP to my private IP (server).

I believe that there is some range of Public IPs which can be used. But I didn't really understand this printout.

I know it is difficult to help without knowing the exact network structure but any suggestion may help.

Thank you very much!

Here is an example howto forward a port on a cisco router.

http://www.laplink.com/support/kb/article.asp?id=45

It seems that this connection has two public IPs.

I make mistake in line:
ip nat inside source static 10.4.46.10 87.147.20.12 extendable
It should be:
ip nat inside source static 10.4.46.10 87.147.20.13 extendable

It seems that the router is configured for another Public ip which is directed to 10.4.46.10.

I have no access to this cisco router, it manages the ISP who makes free internet connection for schools. And the cooperation with this ISP is realy hard.

this method will redirect a single public IP into a single LAN IP host - means all port 1 to 65335 from your 87.147.20.12 public IP will be redirect to your 10.4.46.10 server.

this example will redirect certain port from your public IP to port on your server , and let other ports stay closed :

ip nat inside source static 10.4.46.10 25 87.147.20.2 25 extend --> smtp
ip nat inside source static 10.4.46.10 110 87.147.20.2 110 extend --> pop
ip nat inside source static 10.4.46.10 995 87.147.20.2 995 extend --> pop3s
ip nat inside source static 10.4.46.10 80 87.147.20.2 80 extend --> www
ip nat inside source static 10.4.46.10 443 87.147.20.2 443 extend --> https

you are very welcome.

HTH.