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Troubleshooting Tip: VPN Site-to-Site tunnel Flapping Issue when 'Send Virtual Tunnel Interface IP to the peers' is enabled on Cisco FTD

12-10-2025

Description This article describes how to resolve the VPN Site-to-Site tunnel flapping issue, which happens due to 'mode-cfg' config enabled on Cisco FTD. Scope IPsec VPN, Cisco FTD. Solution During troubleshooting of a site-to-site VPN tunnel flap i...

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Troubleshooting Tip: VPN Site-to-Site tunnel Flapping Issue when 'Send Virtual Tunnel Interface IP to the peers' is enabled on Cisco FTD

Troubleshooting Tip: VPN Site-to-Site tunnel Flapp...

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