I have not bought the public ip but I do have a public ip associated to my network because I have contracted an isp and they provide me with internet access but I cannot configure that public ip in the firewall and I want to know how to redirect the incoming ssl traffic from that public ip of the isp (for example Telefonica) to my private network.
@yennal This redirection is done only by ISP that will allow a specific por to be sent to your private IP.
Saying that, all requests that go to ISPs public IP on port X (for example on port 15443) will be redirected to your private IP. You can ask them to allocate one specific port for you, and you can then configure SSLVPN to use that particular port.
I understand that you are using an internet network from an ISP but you do not have public IP provided by ISP.
Now in this situation, if the upstream ISP is providing fix/static public IP for your network you can ask the ISP to do the one-to-one IP NAT from their end.
From the firewall end, we do not have any control on public IP provided by ISP. For SSL VPN to work the traffic should hit the firewall on sslvpn listening interface and ssl vpn port. The IP available on the firewall interface is in the range 192.168.0.0/24, which is a private IP and not routable on the Internet. You can validate with your ISP if they can provide you with a static IP and if they can do NAT for you so that you will use that IP for SSLVPN.
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