This post is one of a series of packet capture analysis challenges designed to test your ability to understand what is going on in a network from packet captures.Download the Packet Capture and see how many of the questions you can answer from the attached packet capture. The answers are at the bottom of this […]
How to backup and restore Open5Gs config between servers
A glimpse into the complexities of prepaid billing (Online Charging) Diameter based networks.
Setting up Open5Gs without a NAT requirement, and the routing required to do so.
A look at how the HSS can update the profile of an already in-use subscription using Insert Subscriber Data Request/Response.
How does “Network Time” actually get to the UE?
5G introduces Network Slicing, or does it? A look at slicing mechanisms widely used in pre-5G networks.
New database time to support slicing and a migration path for existing users.
A look at MTU and its role in LTE and 5G Transmission.
The Packet Gateway’s purpose in the EPC.
Basic processes and functions of the LTE EPC Serving Gateway (S-GW).
Assigning static IPs to UEs in Open5GS
Using Wireshark to filter S1 messaging to find signalling from a specific subscriber,
List of Open Source Evolved Packet Core implementations
Functionality of eNB MME selection based on Relative Capacity IE
A look into the signalling messages between Network elements in an Evolved Packet Core exchanged during the Attach Procedure
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Registration-Termination Request / Answer allow a Diameter Client (S-CSCF) to indicate to the HSS (Diameter Server) that it is no longer serving that user and the registration has […]
The Diameter User-Authorization-Request and User-Authorization-Answer commands are used as the first line of authorization of a user and to determine which Serving-CSCF to forward a request to.
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Server-Assignment-Request/Answer commands are used so a SIP Server can indicate to a Diameter server that it is serving a subscriber and pull the profile information of the subscriber. […]
These posts focus on the use of Diameter and SIP in an IMS / VoLTE context, however these practices can be equally applied to other networks. The Location-Information-Request/Answer commands are used so a SIP Server query a Diameter to find which P-CSCF a Subscriber is being served by Basics: The RFC’s definition is actually pretty […]