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OS Version Protocol TTL Notes
AIX TCP 60
AIX UDP 30 2
AIX 3.2, 4.1 ICMP 255 3
BSDI BSD/OS 3.1 4.0 ICMP 255 3
Compa Tru64 v5.0 ICMP 64 3
DEC Pathworks V5 TCP and UDP 30 2
FreeBSD 2.1R TCP and UDP 64 2
FreeBSD 3.4, 4.0 ICMP 255 3
FreeBSD 5.0 ICMP 64 2
HP-UX 9.0x TCP and UDP 30 2
HP-UX 10.01 TCP and UDP 64 2
HP-UX 10.20 ICMP 255 3
HP-UX 11.00 ICMP 255 3
HP-UX 11.00 TCP 64
Irix 5.3 TCP and UDP 60 2
Irix 6.x TCP and UDP 60 2
Irix 6.5.3, 6.5.8 ICMP 255 2
MPE/IX (HP) ICMP 200
Linux 2.0.x kernel ICMP 64 3
Linux 2.2.14 kernel ICMP 255 3
Linux 2.4 kernel ICMP 255 3
Linux Red Hat 9 ICMP and TCP 64
MacOS/MacTCP 2.0.x TCP and UDP 60 2
NetBSD ICMP 255 3
OpenBSD 2.6 & 2.7 ICMP 255 3
OpenVMS 7.1-2 ICMP 255 3
OS/2 TCP/IP 3.0 64 4
OSF/1 V3.2A TCP 60 2
OSF/1 V3.2A UDP 30 2
Solaris 2.5.1, 2.6, 2.7, 2.8 ICMP 255 3
Solaris 2.8 TCP 64
Stratus TCP_OS ICMP 255
Stratus TCP_OS (14.2-) TCP and UDP 30 1
Stratus TCP_OS (14.3+) TCP and UDP 64 1
Stratus STCP ICMP/TCP/UDP 60
SunOS 4.1.3/4.1.4 TCP and UDP 60 2
SunOS 5.7 ICMP and TCP 255
Ultrix V4.1/V4.2A TCP 60 2
Ultrix V4.1/V4.2A UDP 30 2
Ultrix V4.2 - 4.5 ICMP 255 3
VMS/Multinet TCP and UDP 64 2
VMS/TCPware TCP 60 2
VMS/TCPware UDP 64 2
VMS/Wollongong 1.1.1.1 TCP 128 2
VMS/Wollongong 1.1.1.1 UDP 30 2
VMS/UCX TCP and UDP 128 2
Windows for Workgroups TCP and UDP 32 2
Windows 95 TCP and UDP 32 2
Windows 98 ICMP 32
Windows 98, 98 SE ICMP 128 3
Windows 98 TCP 128
Windows NT 3.51 TCP and UDP 32 2
Windows NT 4.0 TCP and UDP 128 2
Windows NT 4.0 SP5- 32 4
Windows NT 4.0 SP6+ 128 4
Windows NT 4 WRKS SP 3, SP 6a ICMP 128 3
Windows NT 4 Server SP4 ICMP 128 3
Windows ME ICMP 128 3
Windows 2000 pro ICMP/TCP/UDP 128
Windows 2000 family ICMP 128 3
Windows Server 2003 128 4
Windows XP ICMP/TCP/UDP 128
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