What are two key configuration changes necessary for setting up redundant IPsec VPN tunnels?

Enabling Dead Peer Detection (DPD) is indeed a key configuration change for setting up redundant IPsec VPN tunnels. DPD is a mechanism that helps in identifying whether the peer VPN device is still responsive. By enabling DPD, the system can actively monitor the health of the IPsec tunnel and quickly detect if a tunnel goes down, allowing the traffic to seamlessly failover to an alternative redundant tunnel if one becomes unavailable. This contributes to maintaining high availability and improving network reliability.

While other options might be related to configuring IPsec VPNs, they do not directly address the redundancy aspect as effectively as enabling Dead Peer Detection. For instance, configuring a firewall policy for each tunnel is essential for allowing traffic through, but it does not necessarily provide the redundancy functionality that DPD offers. Similarly, adjusting the static route’s distance and increasing the MTU size may improve certain aspects of the tunnel’s performance but are not fundamental changes strictly necessary for establishing redundancy in IPsec VPN tunnels.