Date: Wed, 13 Jun 2001 03:46:15 -0400 From: raviprasad20@netscape.net To: freebsd-net@freebsd.org Subject: transition mechanism 6 to 4 Message-ID: <2438AE8B.28551050.9513E96F@netscape.net>
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[-- Attachment #1 --] Hi, I just want to check if my understanding of the transition mechanisms in free bsd 4.2 implementation is correct. Assume that a ipv6 packet has to travel through a ipv4 network to an ipv6 destination host. As usual the appropriate routing entry is found for the destination address & nd6_output through the function pointer calls the appropriate output function fo the interface to transmit the packet( ifp->if_output). (Since tunneling is implemented in freebsd through the gif interfaces & configured by the user for configured tunneling) For a gif interface gif_output() is called. I believe that for a ipv4 destination tunnel end point gif output is going to construct a ipv4 encapsulation header & it will call ip_output() to send the packet. The ipv4 routing table will be used to send the packet to the appropriate host based on the destination ipv4 address given to the gif interface. Kindly inform me if my understanding is correct. regards ravi prasad __________________________________________________________________ Get your own FREE, personal Netscape Webmail account today at http://webmail.netscape.com/ [-- Attachment #2 --] ࡱ > # % " 7 ` bjbjUU " 7| 7| K l & & & : 0 0 0 0 < : \ \ \ \ \ = = = $ l & = ; = = = \ \ = 4 \ & \ = ^ & \ P 0: 0 q . 0 H ( H : : IPV6 Module Ipv4 Module Ipv6 module Gif interface nd6_output gif_output This function adds the encapsulation header (ipv4) constructs the ipv4 header. gif_process Not an actual free bsd function Ip_output Interface found from routing table Uses ipv4 routing table to send the packet through an appropriate interface. - ` j CJ UmH nH u . ; < = K V W b c ] ^ ` ^` K _ ^ _ ` 1h / =!"#$% i 8 @ 8 N o r m a l CJ _HaJ mH sH tH < A@ < D e f a u l t P a r a g r a p h F o n t 0 B` 0 B o d y T e x t B*ph h u ` h u ` . ; < = K a 0 0 0 0 0 0 0 0 0 0 ` ^ ` _ 8 @ ( B 2 B 2 N B S D ` c $ G Hh B 2 N B S D ` c $ GTHI N B S D T B c $ D B 2 H B C D H B C D H B C D H B C D N B S D T C GHa l 0 G H\ B S ? O @ ! " # $ % & ' ( ) * + , ` P LP t T t < ( L t ! ! t t l ! t l l t l t t t D% t P t @ d t 4 t T p T @ t @ @ \ t T h T T t T p t L h t K a K N W Z a 3 3 3 J K V W ^ a R a v i P r a s a d g C : \ D o c u m e n t s a n d S e t t i n g s \ r a v i p r a s a d \ A p p l i c a t i o n D a t a \ M i c r o s o f t \ W o r d \ A u t o R e c o v e r y s a v e o f D o c u m e n t 1 . a s d R a v i P r a s a d A : \ I P V 6 M o d u l e I p v 4 M o d u l e . d o c R a v i P r a s a d A : \ I P V 6 M o d u l e I p v 4 M o d u l e . d o c R a v i P r a s a d A : \ I P V 6 M o d u l e I p v 4 M o d u l e . d o c R a v i P r a s a d ] C : \ D o c u m e n t s a n d S e t t i n g s \ r a v i p r a s a d \ M y D o c u m e n t s \ I P V 6 M o d u l e I p v 4 M o d u l e - k a m e t r a n s i t i o n . d o c @ J J s e e J J ` ` @ U n k n o w n G z T i m e s N e w R o m a n 5 S y m b o l 3& z A r i a l " q h fkVffkVf > ! 20 L 2 I P V 6 M o d u l e R a v i P r a s a d R a v i P r a s a d Oh +'0 t 0 < H T \ d l IPV6 Module PV6 Ravi Prasad avi avi Normal a Ravi Prasad 2 vi Microsoft Word 9.0 @ F# @ p0@ p0 > ՜. +,0 h p LG Soft India Ltd V6 L IPV6 Module Title ! $ R o o t E n t r y F P=& 1 T a b l e H W o r d D o c u m e n t S u m m a r y I n f o r m a t i o n ( D o c u m e n t S u m m a r y I n f o r m a t i o n 8 C o m p O b j j O b j e c t P o o l P=P= F Microsoft Word Document MSWordDoc Word.Document.8 9q
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