This forum is for all security enthusiasts to discuss Fortinet's latest & evolving technologies and to connect & network with peers in the cybersecurity hemisphere. Share and learn on a broad range of topics like best practices, use cases, integrations and more. For support specific questions/resources, please visit the Support Forum or the Knowledge Base.
I changed the MTU to 2000B (mtu-override) on wan1 port on a FG60D that connects to a FG1200D cluster with IPSEC. The config of the spoke is not changed. I did not expect anything to happen since I only changed one end, except maybe the IPSEC tunnel flapping. But after some seconds I suddenly got 1922B through with DF-bit set. So - IPSEC tunnel is apparently working.
Kind of weird, since the hub has no MTU config?
I use one phase1 and 5-6 phase2 per spoke, and have around 100 spokes. Another weird thing is that all other phase2 in this hub-and-spoke setup ALSO flapped. That is, changing MTU on ONE SPOKE tears down ALL TUNNELS? Can this be right?
Running 5.2.7.
-- Bjørn Tore
Nominating a forum post submits a request to create a new Knowledge Article based on the forum post topic. Please ensure your nomination includes a solution within the reply.
Select Forum Responses to become Knowledge Articles!
Select the “Nominate to Knowledge Base” button to recommend a forum post to become a knowledge article.
The Fortinet Security Fabric brings together the concepts of convergence and consolidation to provide comprehensive cybersecurity protection for all users, devices, and applications and across all network edges.
Copyright 2024 Fortinet, Inc. All Rights Reserved.