Bugtraq mailing list archives
Re: IP TTL Field Value with ICMP (Oops - Identifying Windows 2000 again and more)
From: Frank Knobbe <FKnobbe () KNOBBEITS COM>
Date: Fri, 1 Sep 2000 13:14:19 -0500
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
-----Original Message----- From: Ofir Arkin [mailto:ofir () ITCON-LTD COM] Sent: Thursday, August 31, 2000 6:40 AM [...] - Windows 95/98/98SE/ME/NT4 WRKS SP3,SP4,SP6a/NT4 Server SP4 - all using 32 as their IP TTL field value with ICMP Echo requests. [...] What if we do not get a match? Than we know that some one changed the default TTL field value in his machine. Please note that some networking devices might have values similar to those presented here. Some might say, that setting the default TTL value with ICMP could be altered. True. Just do it!
Windows NT uses 128 as the default. This can (and should) be changed with following Registry key entry: HKEY_LOCAL_MACHINE\System \CurrentControlSet \Services \Tcpip \Parameters DefaultTTL REG_DWORD 1–255 seconds Default: Windows NT 4.0 128 Windows NT 3.51 and earlier 32 Specifies the default Time To Live (TTL) value set in the header of outgoing IP packets. The TTL determines the maximum amount of time an IP packet can live on the network without reaching its destination. It limits the number of routers an IP packet can pass through before being discarded. Note Windows NT does not add this value to the Registry. You can add it by editing the Registry or by using a program that edits the Registry. There are many more important and interesting IP settings. For more information, consult the file REGENTRY.HLP that comes with the Windows NT Resource Kit. Regards, Frank BTW: My NT machines appear to be Unix ;) -----BEGIN PGP SIGNATURE----- Version: PGP Personal Privacy 6.5.1 Comment: PGP or S/MIME (X.509) encrypted email preferred. iQA/AwUBOa/x+0RKym0LjhFcEQI5ZgCeKaEywGxoP4t3EQR0ZPklEJUd+qYAoPGC bmZiZqR4ifirSI7VLkEKMGVR =/BeW -----END PGP SIGNATURE-----
Current thread:
- Re: IP TTL Field Value with ICMP (Oops - Identifying Windows 2000 again and more) Stéphane OMNES (Sep 01)
- <Possible follow-ups>
- Re: IP TTL Field Value with ICMP (Oops - Identifying Windows 2000 again and more) Frank Knobbe (Sep 02)