a = "1.1.1.0/24"
b = "2.2.2.0/24"
l = "192.168.0.1"
p = "192.168.100.1"
flow esp out from 1.1.1.0/24 to 2.2.2.0/24 local 192.168.0.1 peer 192.168.100.1 type require
flow esp in from 2.2.2.0/24 to 1.1.1.0/24 local 192.168.0.1 peer 192.168.100.1 type use