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Internet Layer Reliance If both lower and higher layer dependencies are undesirable, then IP configuration (security) needs to depend on the Internet layer. During boot, some Internet layer facilities may not be available IP fragmentation and reassembly not reliable when sending from the unspecified address IPsec requires an IP address Implications IPsec typically used only after address assignment or for relay-server security Payloads no larger than MTU; may need to build-in fragmentation support to handle certificate payloads |