flow esp out proto etherip from 1.1.1.1 to 2.2.2.2 peer 2.2.2.2 type require
flow esp in proto etherip from 2.2.2.2 to 1.1.1.1 peer 2.2.2.2 type use
flow esp out proto etherip from 2.2.2.2 to 3.3.3.3 peer 3.3.3.3 type require
flow esp in proto etherip from 3.3.3.3 to 2.2.2.2 peer 3.3.3.3 type use