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Policy is a key component in the interoperations among multiple heterogeneous domains of networks with different routing metrics and preferences. IDRM is a recent protocol that enables policy-based inter-domain routing over mobile ad hoc networks (MANETs), supporting dynamic network topology and diverse intra-domain routing protocols. Notwithstanding a protocol to interoperate multi- domain MANETs, there are fundamental challenges to support dynamic networks - how can network administrators formulate practical inter-domain routing policies considering MANET-specific characteristics. This paper studies this issue with illustrating examples, and discusses potential solutions.