Content impressions and page-views show up from different IPs (and are therefore recognised as different users)

[andrelung]

We recently implemented the tracker-proxy and everything looks good, except:

Our Matomo is running as a docker container behind a reverse proxy. I think this might be the issue, but I do not know how to proceed. The initial configuration was:

[...]
proxy_client_headers[] = "HTTP_X_FORWARDED_FOR"
proxy_host_headers[] = "HTTP_X_FORWARDED_HOST"
[...]

After a little try-and-error now we are running this and it "feels" a little better, but I can not say for sure. This is also does not happen to every tracked user:

[...]
; following line was added to test split users
; It is also possible to check multiple proxy_client_headers, which will be checked in order until a header value is found:
proxy_client_headers[] = "HTTP_CLIENT_IP"
proxy_client_headers[] = "HTTP_CF_CONNECTING_IP"
proxy_client_headers[] = "HTTP_X_FORWARDED_FOR"
proxy_host_headers[] = "HTTP_X_FORWARDED_HOST"
[...]

We are on the most current versions (Matomo version: 5.3.2, tracker-proxy Commit 942980e).

I am open any hint or suggestion. Please also ask if you need more information about our setup.

[andrelung]

I tried to get my head around the issue and I think I identified a lead. The issue occurs when the tracker sends requests in bulk. I think in these cases matomo is ignoring the cip parameter in the request url:
/matomo.php?cip=78.35.146.215&token_auth=

Now I am not sure, if this is a issue of the tracker-proxy or if it is a matomo issue. @tsteur you commented on similar issues in the past. Would you mind helping me out? With a little help, I'll try to fix it and create a PR

[tsteur]

@andrelung sorry I don't remember this. I'd assume though that if there's bulk requests, you want to make sure that each request has the cip parameter set (each request within the bulk request).

[andrelung]

I'll try to implement that, thank you!

[andrelung]

I think I fixed this issue and may have improved the product. However I am cautious, because I am very new to PHP. I'd love for someone to double check my changes.

[andrelung]

Still got one issue, which I can't figure out:

Even with the same IP, people are recognised as different visitors with different Visitor IDs. I don't know where to look. Any help is highly appreciated!