I have an IPsec VPN tunnel that has an address range of over 200 addresses, and currently there are 60 active dial up connections. However I'm seeing all those connections are using addresses at the upper end of the range, and some users are failing to connect (debug shows "could not allocate IPv4 address"). So even though my IKE gateway list has only 60 instances, I suspect the previously used addresses aren't being put back into the pool . Does anyone know how to see available addresses for an IPsec tunnel?
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According to this link:
IPsec VPN IP address assignments | FortiGate / FortiOS 7.4.4 | Fortinet Document Library
you can execute diagnose vpn ike gateway flush to release previously used IPs
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