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Nowadays, many Campus Networks have at least two egresses like CERNET, ChinaNet, etc. The situation of multi-egress routing to access Internet has been founded and internet search speed has been increased greatly. However, partial asymmetry of access path brings some problems. For examples, it has been refused sometimes when sending or receiving emails. According to the analysis of method to control the access path, we can configure routing appropriately by the policy-based routing on the basis of source address and the extension of NAT address mapping and arrive at the purpose of solve problems.