Way to see Destination IP behind VIP in apache

[RolandBaumgaertner72]

Hi,

I found some informacion on the community sites refering reverse proxy but I am not sure.

We have a webserver behind a VIP with only 1 static IP (there are like 4 VIPs to different hosts in the DMZ). In one VIP the Dev Team would like to get the source public IP to see at the apache for a new service.

With the actual NAT they get only the DMZ interface IP because of the NAT.

Any good ideas?

Thanks

[ozkanaltas]

You have two options for that. You can use a web proxy profile. This profile adds the client's IP address to the HTTP request header.

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Adding-x-forwarded-for-header-to-explicit-...

https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-add-X-forwarded-headers-to-the-traf...

Or you can use Virtual Server instead of VIP. This way also doing the same thing. 

https://community.fortinet.com/t5/FortiGate/Technical-Tip-Preserve-client-IP-in-Virtual-servers/ta-p...

The dev team can catch real client IPs from the x-forwarded-for request header. 

[AEK]

Hi Roland

Are you using a VIP or Virtual Server with SSL offloading?

Are you using DNAT only or have you also enabled SNAT at firewall policy level?

[RolandBaumgaertner72]

Hi,

I will check the options, thanks!

Right now it is a normal VIP with DNAT, so the apache only gets the IP of the DMZ Interface.

regards

[AEK]

Hi Roland

DNAT shouldn't change source NAT, so you should see the original source IP in the IP packet when it reaches the server. Or am I wrong?

[ebilcari]

On the firewall policy that allows access to the VIP you should disable NAT in order to not do SNAT.