Technical data

5.4 Virtual Server 97

5.4 Virtual Server

Via the virtual server you can forward the access to speciﬁed

ports of your external IP address to a virtual server within your

internal network, e.g. for FTP or POP3 access.

Towards the outside, the HorstBox plays the server part receiving

requests from external users under your public IP address and

routing them to the virtual server.

A computer in your internal network behind NAT or behind a

ﬁrewall can thus provide services to the outside as a virtual

server. Single ports or port ranges and protocols (UDP/TCP) can

be speciﬁed for this purpose. File sharing or web services like

HTTP, FTP or POP3 are possible. The private IP addresses of

servers within the local network remain protected. If you use a

dynamic public IP address, consider to activate DDNS.(see 5.3

Dynamic DNS on p.95)

You can also use a virtual server to redirect HTTP hacking attacks

to a HTTP server within the DMZ.

Figure 5.8: Virtual Server