The impact of routing attack on the Integrated Universal Mobile Telecommunications System (UMTS) and Wireless Local Area Network (WLAN) ad hoc network can be minimized by choosing a suitable secure routing protocol. This paper introduces a new secure inter-domain routing protocol SNAuth_SPERIPv2 and its performance comparison with other secure routing protocols for Constant Bit-Rate (CBR) voice conversational traffic. Keywords: Integrated UMTS and WLAN Ad Hoc network, Scalability, QoS, Routing, Security, WHACite this Article Shashank Tripathi, Jain AK. Design and Performance Comparison of Secure Routing Protocol in Integrated UMTS and WLAN Ad Hoc Networks. Journal of Network Security. 2016; 4(3): 28–41p.