# 4G-5G NSA Connection Sample - Hosts File
# Source: OpenAirInterface LTE/NSA testbed (openairinterface.org)
#
# Format:
#   IP hostname          - Standard /etc/hosts format
#   IP:port hostname     - VisualEther extension for port-specific mapping
#
# Naming Convention: Entity.Domain (hierarchical dot notation)
#   - EPC: Evolved Packet Core elements (4G core)
#   - RAN: Radio Access Network elements
#   - Term: Terminal/User Equipment
#
# Network Architecture:
#   This capture shows a 4G LTE attach with NSA (Non-Standalone) dual
#   connectivity setup. The E-RABModificationIndication messages indicate
#   secondary node (potentially gNB) addition for EN-DC (E-UTRAN NR DC).
#
# Protocol Interfaces:
#   - S1-MME: eNB <-> MME (SCTP, S1AP signaling)
#   - S11: MME <-> SGW (UDP 2123, GTPv2-C)
#   - S1-U: eNB <-> SGW (GTP-U user plane)
#   - S6a: MME <-> HSS (Diameter over TCP 3868)
#
# Key Identifiers:
#   - IMSI: 222010100001140
#   - eNB Name: eNB-Eurecom-LTEBox
#   - APN: oai.ipv4

# EPC Domain - Core Network Control Plane
192.168.61.149  📍 MME.EPC         # Mobility Management Entity (mme.openairinterface.org)
192.168.61.132  🚪 SGW-C.EPC       # Serving Gateway - Control Plane (S11 interface)
192.168.61.133  🚪 SGW-U.EPC       # Serving Gateway - User Plane (S1-U interface)

# EPC Domain - Diameter S6a (MME <-> HSS authentication)
# HSS endpoint inferred from Diameter Destination-Host: hss.openairinterface.org
# The HSS likely shares an IP with one of the core elements or is on a separate host

# RAN Domain - Radio Access Network
192.168.18.199  📡 eNB.RAN         # eNodeB (eNB-Eurecom-LTEBox, S1-MME and S1-U)
192.168.18.198  📡 eNB-2.RAN       # Secondary eNB/gNB for EN-DC (NSA dual connectivity)

# Terminal Domain - UE Assigned Address
12.1.1.2        📱 UE.Term         # User Equipment assigned IP (PDN: oai.ipv4)
