Getting the user's local IP - Always getting 192.168.2.1

Question

I need to get the user's local IP for my ASP.NET application and I'm using this method:

protected string GetIPAddress()
{
    System.Web.HttpContext context = System.Web.HttpContext.Current;

    string ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

    if (!string.IsNullOrEmpty(ipAddress))
    {
        string[] addresses = ipAddress.Split(',');
        if (addresses.Length != 0)
        {
            return addresses[0];
        }
    }

    return context.Request.ServerVariables["REMOTE_ADDR"];
}

However, when I publish my website I always get 192.168.2.1 no matter where the user is opening the website from.

Does anyone know how to solve this issue?

`192.168.2.1` That's probably the router gateway. Is your server behind a router? — Alvin Wong, Nov 01 '12 at 09:15
I need to check if the user opened the site from a certain range of IPs or not, but I cannot do this since I'm always getting 192.168.2.1 @AlvinWong — , Nov 01 '12 at 09:17
The current answers sort of prove a point made many times here - always post your relevant code, regardless of if it comes from a previous SO answer. Don't expect people to follow links to anywhere. =) — J. Steen, Nov 01 '12 at 09:30
The server is behind a router which uses port forwarding, so the connection is always to the router and NAT-ed to your server, so `REMOTE_ADDR` won't work. I think that's why `HTTP_X_FORWARDED_FOR` won't work either. — Alvin Wong, Nov 01 '12 at 09:49
Then what can I use alternatively? For intance, http://jsonip.appspot.com/ works fine, but I will try to prevent user to connect to internet, but access it only locally, so he cannot open that site. @AlvinWong — , Nov 01 '12 at 09:51

score 0 · Answer 1 · answered Nov 01 '12 at 09:20

0

Some network devices make use of the X-forwarded-for header. You should check if the requests hitting your application have this header.

answered Nov 01 '12 at 09:20

Greg B

14,597
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141

The point that the poster said, code in the link is followed, means x-forwarded-for is used. – Milind Thakkar Nov 01 '12 at 09:26

score 0 · Answer 2 · answered Nov 01 '12 at 09:27

0

You can get the client's IP address from HTTP_X_FORWARDED_FOR or REMOTE_ADDR.

var ipAddress = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

if (string.IsNullOrEmpty(ipAddress ))
{
    ipAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}

return ipAddress;

answered Nov 01 '12 at 09:27

Ekk

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19
27

1

I tried exactly the same, but I always get 192.168.2.1 no matter where the user is opening the website from. – Nov 01 '12 at 09:29
... as OP already does, if he uses the code in the linked answer. – J. Steen Nov 01 '12 at 09:29

Getting the user's local IP - Always getting 192.168.2.1

2 Answers2