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Transport engineering utility for modeling GTPv1-U tunneling overhead on LTE S1-U and 5G N3 interfaces, factoring in GTP, UDP, and outer IP header encapsulation.
GTP-U overhead calculators add IP/UDP/GTP headers (and extensions) to inner packets so N3/S1-U transport MTU and capacity plans stay fragmentation-free.
The analyzer breaks down the full encapsulation stack: inner IP+payload + GTP header (8B) + UDP (8B) + outer IP (20B IPv4 / 40B IPv6), calculating the overhead ratio for any payload size.
Built on 3GPP Technical Specifications, ensuring accuracy for production deployments and security audits.
Calculations specifically designed to identify protocol vulnerabilities and signaling misconfigurations.
GTP-U overhead is a key consideration for backhaul transport capacity planning. Dominates for small packets like VoIP (20-byte RTP payloads). Used for S1-U and N3 link dimensioning.
Edge-V8 Isolate
Technical Audit
< 50ms (Global)
Secured by Auth0
1500-byte UE packet + GTP-U/UDP/IPv4 can exceed 1500 on the transport VLAN. Lower UE MTU to 1460 or enable outer jumbo carefully end-to-end.
Extension header usage varies by release and vendor. Confirm with pcaps.
GTP-U base headers are typically 8 bytes, with extensions for PDU session containers in 5G adding more. Outer IP/UDP must be included for transport MTU planning.
Inner UE MTU plus GTP-U/UDP/IP (and optional IPsec) exceeds path MTU. Clamp MSS or lower UE MTU after summing overheads.
No—stack them when user plane is encrypted.
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Master Modern Telecom Network Attacks & Defense
Go beyond calculations. Access the TelcoSec Academy sandbox to practice real-world SS7 firewall bypass simulations, Diameter exploit analysis, and RAN security hardening.
SSO Link: Academy Node 0x93FF