XFF IP address not seen in traffic logs

Keith_S — Wed, 19 Jun 2024 21:32:57 GMT

I am trying to get the PA firewall to display and use the the x-forwarded-for (XFF) header in incoming web browsing traffic.

I must be missing something.

We have an Azure application gateway which is inserting the client_ip in the header, and stripping the port, as instructed:

Behind the Azure AG is a VM300 (4x vCPU firewall) which should be showing the XFF client IP in the traffic logs.

I enabled the XFF for client IP, tried both thru the WebUI and at the CLI.

I have SSL decryption working and I'm testing on ports 80 and 443 anyway.

I have the XFF column in the log displayed, but it's never populated.

I have a URL filtering license and checked the XFF box on the url profile.

The status is that the XFF IP is shown on some entries in the URL logs.

The XFF IP is never shown in the traffic logs.

Some questions:

I examined packet captures with Wireshark and found that the XFF IP is in some packets, but not in every incoming packet. Is that normal?

What am I missing?

Thanks.

Re: XFF IP address not seen in traffic logs

Keith_S — Fri, 21 Jun 2024 18:31:42 GMT

It turns out this works but only displays the XFF IP in denied traffic, not allowed.

There is also a fix in 11.1.3 for this, so this should start showing the XFF IP in allowed traffic also. Bug ID PAN-233463.