Understanding Speedtest Data Paths: UE to Server Routing Options

Dear All.

For Speedtest APP:

It can track UE location & suggest testing server nearby UE.

So, the data path is:

  • UE - eNB - Operator Core - Server

Or is:

  • UE - eNB - Server

?

So here is the thing.If you are installing a normal mobile app and pinging a publically available ping server it is going via your internet APN.Path is UE—>ENB—–>SGW—→PGW—→Internet GW(NAT)—>Public server. If you are try to ping one of your OAM IPs,lets say the jumphost you are trying to connect to the live node,and UE can ping it then two thing can happen.

1)UE can actually reach your jumphost IP(If that is the case this is a huge issue and you should definetly inform Security team or IPN team to check the firewall.Main reason for that is someone has implimented a BGP route leak from OAM VRF to traffic VRF which should NEVER EVER HAPPEN)

or

2)IP planing team has reused the same OAM subnet in the internet traffic VRF as well and the pinging IP is a duplication of your jummphost IP which can happen since two VRFs can have same subnets but for a larger volume network like telecommunication core network its not a good thing.

thank you

Kind regards

Isuru