By J. D. Wegner
Internetworking Protocol (IP) addresses are the original numeric identifiers required of each gadget hooked up to the net. they enable for the right routing of information throughout very complicated around the world internetworks. the principles for his or her structure and use are ruled through the web Engineering activity strength (IETF) of the the web SOCiety (ISOC). based on the exponential raise favourite for brand spanking new IP addresses, the IETF has finalized its revision on IP addressing as IP model 6, additionally understand as IPng (ng = subsequent Generation). Key proprietors corresponding to Cisco and significant net provider companies resembling the US on-line have already introduced plans emigrate to IP model 6.IP handle allocation inside of a company calls for loads of long term making plans. This well timed ebook addresses the administrator and engineer's want to know how IP 6 affects their firm networks * excellent for firms making plans a phased migration from IP four to IP 6* well timed e-book: The IETF regular used to be finalized in early 1999 and should start to be carried out in overdue 1999/2000. the present IP model four handle set could be exhausted via 2003* The publication will specialise in making plans and configuring networks and units for IP 6. particularly, it is going to conceal how one can: * bring up the IP handle measurement from 32 bits to 128 bits * aid extra degrees of addressing hierarchy * help an elevated variety of addressable nodes * aid easier auto-configuration of addresses * increase the scalability of multicast routing by means of including a "scope" box to multicast addresses * Use a brand new "anycast handle" to ship a packet to anybody of a gaggle of nodes
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Extra info for IP Addressing and Subnetting, Including IPv6
Your choice of r o u t i n g protocols c a n affect y o u r choice of m a s k . Of the p o p u l a r r o u t i n g protocols, RIP (version 1) a n d IGRP i m p o s e c e r t a i n r e q u i r e m e n t s on a d d r e s s i n g ~ a l l devices on all s u b n e t s m u s t u s e t h e s a m e m a s k . In o t h e r words, y o u are forced into a f i x e d - l e n g t h - m a s k a d d r e s s i n g plan. If y o u u s e RIP (version 2), OSPF, or EIGRP, t h e n y o u c a n still c h o o s e to u s e the s a m e m a s k for e a c h s u b n e t , b u t the protocols do n o t d e m a n d it.
An IP a d d r e s s identifies a device on a n e t w o r k . IP a d d r e s s e s a re a s s i g n e d from c l a s s e s t h a t c o n t a i n different g r o u p s of a d d r e s s e s . E a c h IP n e t w o r k h a s a n e t w o r k n u m b e r . E a c h IP s u b n e t h a s t h e n e t w o r k n u m b e r of its p a r e n t n e t w o r k a n d a s u b n e t n u m b e r . T h e s u b n e t n u m b e r c a n be f o u n d b y l o c a t i n g t h e s u b n e t field in t h e s u b n e t m a s k .
T h e q u e s t i o n is a n s w e r e d b y e x p r e s s i n g t h e n u m b e r of b i t s in t h e m a s k w i t h r e l a t i o n to t h e c l a s s of a d d r e s s . F o r i n s t a n c e , if a m a s k of 2 5 5 . 2 5 5 . 2 5 4 . 0 is u s e d w i t h a c l a s s B a d d r e s s , t h e r e a r e 7 b i t s in t h e m a s k . It m a y look like t h e r e a r e a total of 23 bits, w h i c h t h e r e are. To clearly e x p r e s s t h e s u b n e t t i n g , however, we m u s t s a y t h a t t h e m a s k is a 7-bit m a s k for a c l a s s B a d d r e s s .