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Dave
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Joined: Apr 07, 2004
Posts: 311
Location: A+, Net+
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 Posted: Sat May 08, 2004 9:20 am Post subject: Net+ part 2 |
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M o s t o f u s h a v e h e a r d t h e t e r m I P v 6 an d I P v 4 s e v e r a l t i m e s . B u t d o e s an y on e kn o w w h a t t h e n a m e s m e an ?
H I N T : s in c e t h e r e w a s n o s u c h t h in g a s I P v 2 , I P v 3 , o r I P v 5 ; w e c an d i s c a r d t h e n o t i on t h a t t h e " v " m e an s v e r s i on .
A N D w h i l e y o u ' r e a t i t , t e a c h m e t h e " s h o r t h an d " m e t h o d f o r w r i t in g I P v 6 a d d r e s s e s . . .
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TOYOTA PRIUS: Driving the Future of Technology Today. |
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Dave
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Joined: Apr 07, 2004
Posts: 311
Location: A+, Net+
Status: Offline
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| Posted: Tue May 11, 2004 2:41 pm Post subject: |
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g e e , a l m o s t f o r g o t a b o u t t h i s p o s t . . .
A c t u a l l y t h e 4 in I P v 4 s t o o d f o r t h e b i t l en g t h o f t h e a d d r e s s . I p v 4 h a s a 3 2 b i t a d d r e s s . I P v 6 h a s a 1 2 8 b i t a d d r e s s an d s in c e i t s 2 h i g h e r t h an 4 , t h e b i t c o un t w a s 3 2 * 2 * 2 = 1 2 8 w h i c h w a s 4 + 1 + 1 in b in a r y p o w e r n o t a t i on .
o r i g in a l l y w h en i t w a s r e a l i z e d t h a t t h e r e w o u l d b e a n e e d f o r m o r e I P a d d r e s s e s , t h e p l an w a s f o r I P v 5 ( a c t u a l l y t h i s n a m e w a s u p in t h e a i r ) w h i c h w o u l d h a v e h a d a 6 4 b i t a d d r e s s l en g t h . b u t t h a t i d e a w a s n i x e d b e c a u s e t h e y w an t e d t o m a k e s u r e t h a t t h e r e w o u l d b e en o u g h a d d r e s s e s .
An d I P v 6 s h o u l d p r o v i d e u s p l en t y f o r y e a r s t o c o m e . In f a c t a t 2 ^ 1 2 8 t h , t h e r e w i l l b e en o u g h I P a d d r e s s e s t o a s s i gn o v e r 1 0 0 0 a d d r e s s e s f o r e v e r y s q u a r e m e t e r o f in h a b i t e d E a r t h !
R i g h t n o w , t h e in t e rn e t i s in t h e p r o c e s s o f s w i t c h in g o v e r w i t h o u t d i s r u p t i on . w e l l , m o s t o f f t h e I P v 6 a d d r e s s e s a r e f i l l e d w i t h z e r o s . T h e y a r e w r i t t en in g r o u p s o f o c t e t s s e p a r a t e d b y a : . s o m e t h in g l i k e X X X X : X X X X : X X X X : X X X X : X X X X : X X X X : X X X X : X X X X . t o m a k e i t e a s i e r t o w r i t e ( a t l e a s t a t t h e b e g in n in g ) c on s e c u t a t i v e z e r o p l a c e h o l d e r s c an b e d en o t e d w i t h a : : .
f o r e x a m p l e ; t h e I P v 6 a d d y o f A B C D : 0 0 0 0 : 0 0 0 0 : 0 0 0 0 : 0 0 0 0 : 0 0 0 0 : 0 0 0 0 : 1 2 A C c an a l s o b e w r i t t en a s
A B C D : 0 : 0 : 0 : 0 : 0 : 0 : 1 2 A C . b u t e v en t h a t c an b e a d r a g s o w e c an a l s o w r i t e i t
A B C D : : 1 2 A C . n o w t h a t i s m u c h n i c e r . t h e t w o c o l on s a r e kn o wn t o f i l l in a l l t h e e x t r a p l a c e s w i t h z e r o s . k e e p in m in d t h a t t h e s h o r t h an d m e t h o d c an on l y b e u s e d on c e p e r a d d r e s s .
f o r t h e a d d r e s s A B C D : 0 : 0 : F F : 0 : 0 : 0 : F F 8 8 c an b e w r i t t en
A B C D : : F F : 0 : 0 : 0 : F F 8 8 o r A B C D : 0 : 0 : F F : : F F 8 8
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