IPSec passthrough is disabled by default on the Vigor2820. The reason for this is because IPSec passthrough is not compatible with the new NAT-T support of the routers internal VPN server. The Vigor2820 NAT-T support allows remote VPN clients that are behind a NAT router to more easily connect via VPN.

There is a telnet command to enable IPSEC passthrough. The command is srv nat ipsecpass on.

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