FINGERPRINTING IPV4 AND IPV6 ROUTERS USING ICMP
Bofman, Wesley G.
Shaffer, Alan B.
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This project reassesses and expands on a simple fingerprinting method for Internet Protocol version 4 (IPv4) routers, and extends that methodology to Internet Protocol version 6 (IPv6) routers. The initial methodology, developed by Vanaubel, Pansiot, Merindol, and Donnet, utilized initial time to live (iTTL) values derived from Internet Control Message Protocol (ICMP) echo-reply and TTL exceeded messages. The current project used ICMP echo-reply and destination unreachable/port unreachable, combined with a third iTTL value derived from ICMP timestamp messages, to strengthen the fingerprint. We adapted the methodology to IPv6-enabled routers using the initial hop limit (iHL) values from ICMPv6 echo-reply and destination unreachable/port unreachable messages. The main goal of this project is to develop a simple fingerprinting technique to identify IPv4 and IPv6 router platforms. We were able to successfully expand the previously developed IPv4 router fingerprint using the ICMP timestamp reply message. Using this fingerprinting methodology, Juniper routers can be identified. However, this fingerprinting technique cannot distinguish between Cisco and Huawei routers. With IPv6, it became evident that most routing devices follow the recommended iHL value of 64 (RFC 1700). Thus, our methodology cannot distinguish between IPv6 routing devices. We recommend additional analysis of Cisco and Huawei devices running IPv4 t
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