IPsec proposals are configured for IPsec VPNs, including L2TP Layer 2 Tunneling Protocol over IPsec and GRE Generic Routing Encapsulation over IPsec VPNs. You can configure multiple IPsec proposals and include them in different IPsec and L2TP policies. The algorithm or algorithms in those proposals will secure traffic that is part of a VPN that is established with that policy. Each IPsec proposal specifies the following:
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