[ATP/FLEX]When using Nebula VPN, the site-to-site VPN fail
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Zyxel_Kevin
Posts: 958
Zyxel Employee





in VPN
Symptom:
You have two firewalls in the same Org different Sites, The Site-to-Site VPN cannot build successfully.
You will see many Fragmented packets within IKE negotiation
Workaround:
Due to Nebula VPN using certificates for establishment, negotiation packets include certificates. This may result in issues with ISPs having smaller MTUs.
Please consider using a non-Nebula VPN Pre-shared key
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