Networking

To work with networking, a good understanding of IP Addressing and DNS is required.

 

I have been working as a network engineer since the mid 90's, here are some of the sites I use the most.

Misc. Tools and Links

  • Cisco
  • DYNDNS
  • DNS Stuff
  • EditDNS - Free DNS hosting
  • Default TTL Values in TCP/IP - Passive Fingerprinting:
    • # OS	     	VERSION	PLATFORM	TTL	WINDOW		DF	TOS
      #---	     	-------	--------	---	-----------	--	---
      
      DC-OSx          1.1-95  Pyramid/NILE    30      8192            n       0
      
      Windows	     	9x/NT	Intel		32	5000-9000	y	0
      
      NetApp  	OnTap   5.1.2-5.2.2     54      8760            y       0
      
      HPJetDirect     ?       HP_Printer      59      2100-2150       n       0
      
      AIX          	4.3.x   IBM/RS6000      60     	16000-16100     y       0
      AIX          	4.2.x   IBM/RS6000      60     	16000-16100     n       0
      Cisco           11.2    7507            60      65535           y       0
      DigitalUnix  	4.0     Alpha		60     	33580		y	16
      IRIX         	6.x     SGI             60     	61320           y       16
      OS390           2.6     IBM/S390        60      32756           n       0
      Reliant         5.43    Pyramid/RM1000  60      65534           n       0
      
      FreeBSD		3.x	Intel		64	17520		y	16
      JetDirect	G.07.x  J3113A		64	5804-5840	n	0
      Linux		2.2.x	Intel		64	32120		y	0
      OpenBSD 	2.x	Intel		64	17520		n	16
      OS/400		R4.4	AS/400		64	8192		y	0
      SCO		R5	Compaq		64	24820		n	0
      Solaris 	8       Intel/Sparc     64      24820           y       0
      FTX(UNIX)       3.3     STRATUS         64      32768           n       0
      Unisys		x	Mainframe	64	32768		n	0
      
      Netware 	4.11	Intel		128	32000-32768	y	0
      Windows		9x/NT	Intel		128	5000-9000	y	0
      Windows 	2000    Intel           128     17000-18000     y       0
      
      Cisco		12.0	2514		255	3800-5000	n	192
      Solaris		2.x	Intel/Sparc	255	8760		y	0	
      
      
      ## ADDITIONAL NOTES
      #
      # Cisco IOS 12.0 normally starts all IP sessions with IP ID of 0
      # Solaris 8 uses a smaller TTL (64) then Solaris 7 and below (255).
      # Windows 2000 uses a much larger Window Size then NT.

 

Network Monitoring

 

Firewalls