IPSecDotNet5

netsh ipsec static add policy ExamplePolicy
netsh ipsec static add filterlist ExampleFilterList
netsh ipsec static add filter filterlist=ExampleFilterList srcaddr=any dstaddr=any protocol=tcp dstport=8080
netsh ipsec static add filteraction ExampleFilterAction action=block
netsh ipsec static add rule name=ExampleRule policy=ExamplePolicy filterlist=ExampleFilterList filteraction=ExampleFilterAction
netsh ipsec static set policy ExamplePolicy assign=y
netsh ipsec static set policy ExamplePolicy assign=n

Progress:

ipsec.CreatePolicy(policyData)

ipsec.CreatePortFilter("ExampleFilterList", new IPSec.Port[] { new IPSec.Port { port = 8080, portType = IPSec.PortType.TCP } }, out IPSEC_FILTER_DATA data);
ipsec.CreateFilterAction("ExampleFilterAction", IPSec.FilterActionType.Block, out IPSEC_NEGPOL_DATA myFilterAction);
ipsec.CreateRule(policyData.PolicyIdentifier, nfaData);
ipsec.AssignPolicy(policyData.PolicyIdentifier);
ipsec.UnassignPolicy(policyData.PolicyIdentifier);

https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-GPIPSEC/%5BMS-GPIPSEC%5D.pdf