flow esp out proto etherip from 3ffe:1::1 to 3ffe:1::2 peer 3ffe:1::2 type require
flow esp in proto etherip from 3ffe:1::2 to 3ffe:1::1 peer 3ffe:1::2 type require
flow esp out proto etherip from 3ffe:2::1 to 3ffe:3::1 peer 3ffe:3::1 type require
flow esp in proto etherip from 3ffe:3::1 to 3ffe:2::1 peer 3ffe:3::1 type require