Question

I need to get the server’s IP address so that this can be sent along with a Key/Value string collection to a Payment Gateway provider.

I’m running localhost, and Request.ServerVariables["LOCAL_ADDR"] is returning ::1

The validation error I’m getting is returned from Sage Pay:

The ClientIPAddress format is invalid. Should not include leading
zero”s, and only include values in the range of 0 to 255.

Why is this, and how do I get a valid IP address to send?

Answer 1

Disable IPv6 on your local network adapter. ::1 means ‘LOCALHOST’in IPv6. Then you’ll get the normal IPv4 127.0.0.1

Anyway ::1 is a *VALID* IP address..

More on LOCALHOST definition: http://en.wikipedia.org/wiki/Localhost

For IPv4 communications, the virtual loopback interface of a computer
system is normally assigned the address 127.0.0.1 with subnet mask
255.0.0.0. Depending on the specific operating system in use (notably in Linux and Microsoft Windows) and the routing mechanisms installed,
this populates the routing table of the local system with an entry so
that packets destined to any address from the 127.0.0.0/8 block would
be routed internally to the network loopback device.

In IPv6, on the
other hand, the loopback routing prefix ::1/128 consists of only one
address ::1 (0:0:0:0:0:0:0:1 in full notation, the address with a one
at its least significant bit and zero otherwise) is explicitly defined
as the loopback address,[6] though additional addresses may be
assigned as needed to the loopback interface by the host
administrator.