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This tables is an updated summary of Toby Millers paper about Passive OS
Fingerprinting. *Windows 95, Windows 98 and Windows XP fingerprint were added after some lab experiments. Linux ---------------- Window Size = 5840 (Linux 2.4) or 32120 (Linux 2.2) Initial TTL = 64 IP ID: Increments randomly at the start of each session TCP Options: MSS, SackOK, WindowScale, Timestamp, one NOP Total Packet Length: 60 bytes OpenBSD ---------------- Window Size = 16384 Inital TTL = 64 IP ID: Completely random TCP Options: MSS, SackOK, WindowScale, Timestamp, five NOPs Total Packet Length: 64 bytes TOS = 0x10 FreeBsd ---------------- Window Size = 65535 Initial TTL = 64 IP ID: Increments by 1 TCP Options: MSS, WindowScale, three NOPs, Timestamp (Fisrt three SYN tries) Total Packet Length: 60 bytes (First three SYN tries) *TCP Options:MSS (after first three SYN tries) *Total Packet Length: 44 bytes (after first three SYN tries) Solaris 7 ---------------- Window Size = 8760 Initial TTL = 255 IP ID: Increments by one always TCP Options: MSS Total Packet Length: 44 bytes AIX 4.3 ---------------- Window Size = 16384 Initial TTL = 64 IP ID: Increments by one always TCP Options: MSS Total Packet Length: 44 bytes TOS = 0x10 Windows 2000 ---------------- Window Size = 16384 Inital TTL = 128 IP ID: Increments by one all of the time TCP Options: MSS, SackOK, two NOPs Total Packet Length: 48 bytes Windows 98 ------------------ Windows Size= = 8192 Initial TTL = 128 IP ID: Increments by 256 (?) TCP Options: MSS, SackOK, two NOPs Total Packet Lenght: 48 bytes Windows 95 ----------------- Windows Size = 8192 Initial TTL = 32 IP ID: increments by 256 TCP Options: MSS Total Packet Lenght: 44 bytes Windows XP ----------------- Windows Size = 64240 Initial TTL = 128 IP ID: Increments by one TCP Options: MSS, SackOK, two NOPs Total Packet Lenght: 48 bytes References: Toby Miller Original Paper: http://www.sans.org/rr/special/passiveos.php Toby Miller Original Paper - Part 2 http://www.sans.org/rr/special/passiveos2.php Comments: Pedro Paulo Ferreira Bueno bueno@ieee.org |
Handlers 76 Posts Jul 10th 2003 |
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Jul 10th 2003 1 decade ago |
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