FROM = "{ 1.1.1.1, 2.2.2.2, 3.3.3.3 }"
flow esp out from 1.1.1.1 to 4.4.4.4 peer 4.4.4.4 type require
flow esp in from 4.4.4.4 to 1.1.1.1 peer 4.4.4.4 type require
flow esp out from 2.2.2.2 to 4.4.4.4 peer 4.4.4.4 type require
flow esp in from 4.4.4.4 to 2.2.2.2 peer 4.4.4.4 type require
flow esp out from 3.3.3.3 to 4.4.4.4 peer 4.4.4.4 type require
flow esp in from 4.4.4.4 to 3.3.3.3 peer 4.4.4.4 type require