Fortinet documents that NP7-based FortiGates with an IPS profile may drop fragmented UDP packets with payloads of 1636 to 1722 bytes on FortiOS releases before 7.4.10, 7.6.5 or 8.0.0.
Checked 2026-10-02
- Vendor
- Fortinet
- Product
- FortiGate
- Subsystem
- NP7 offload
- Deployment
- on-premises
- Region
- not restricted
- Release range
- NP7 models; FortiOS before 7.4.10 7.6.5 or 8.0.0
- Checked
- 2026-10-02
Sources
- Technical Tip: Fragmented UDP packets with payload sizes in 1636-1722 byte range may be dropped — Fortinet · tier 2 current vendor documentation · Description and Scope sections
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-fortinet-np7-1636-1722-drop. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-fortinet-np7-1636-1722-drop
BibTeX
@misc{warmtransfer-claim-sip-fragmentation-troubleshooting-fortinet-np7-1636-1722-drop,
title = {Troubleshooting failed calls caused by large SIP messages over UDP: source note sip-fragmentation-troubleshooting-fortinet-np7-1636-1722-drop},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-fragmentation-troubleshooting-fortinet-np7-1636-1722-drop},
note = {Source note sip-fragmentation-troubleshooting-fortinet-np7-1636-1722-drop, checked 2026-10-02}
}