< draft-ietf-6lo-ghc-02.txt		draft-ietf-6lo-ghc-03.txt >
	6Lo Working Group C. Bormann		6Lo Working Group C. Bormann
	Internet-Draft Universitaet Bremen TZI		Internet-Draft Universitaet Bremen TZI
	Intended status: Standards Track July 21, 2014		Intended status: Standards Track July 21, 2014
	Expires: January 22, 2015		Expires: January 22, 2015
	6LoWPAN Generic Compression of Headers and Header-like Payloads		6LoWPAN Generic Compression of Headers and Header-like Payloads
	draft-ietf-6lo-ghc-02		draft-ietf-6lo-ghc-03
	Abstract		Abstract
	This short specification provides a simple addition to 6LoWPAN Header		This short specification provides a simple addition to 6LoWPAN Header
	Compression that enables the compression of generic headers and		Compression that enables the compression of generic headers and
	header-like payloads, without a need to define a new header		header-like payloads, without a need to define a new header
	compression scheme for each new such header or header-like payload.		compression scheme for each new such header or header-like payload.
	Status of This Memo		Status of This Memo
	skipping to change at page 13, line 36 ¶		skipping to change at page 13, line 36 ¶
	IP header:		IP header:
	60 00 00 00 00 08 3a ff fe 80 00 00 00 00 00 00		60 00 00 00 00 08 3a ff fe 80 00 00 00 00 00 00
	02 1c da ff fe 00 20 24 ff 02 00 00 00 00 00 00		02 1c da ff fe 00 20 24 ff 02 00 00 00 00 00 00
	00 00 00 00 00 00 00 1a		00 00 00 00 00 00 00 1a
	Payload:		Payload:
	9b 00 6b de 00 00 00 00		9b 00 6b de 00 00 00 00
	Dictionary:		Dictionary:
	fe 80 00 00 00 00 00 00 02 1c da ff fe 00 20 24		fe 80 00 00 00 00 00 00 02 1c da ff fe 00 20 24
	ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 1a		ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 1a
	00 00 00 08 00 00 00 3a 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	copy: 04 9b 00 6b de		copy: 04 9b 00 6b de
	4 nulls: 82		4 nulls: 82
	Compressed:		Compressed:
	04 9b 00 6b de 82		04 9b 00 6b de 82
	Was 8 bytes; compressed to 6 bytes, compression factor 1.33		Was 8 bytes; compressed to 6 bytes, compression factor 1.33
	Figure 8: A simple RPL example		Figure 8: A simple RPL example
	Figure 9 shows an RPL DODAG Information Object, a longer RPL control		Figure 9 shows an RPL DODAG Information Object, a longer RPL control
	message that is improved a bit more. Note that the compressed output		message that is improved a bit more. Note that the compressed output
	skipping to change at page 14, line 19 ¶		skipping to change at page 14, line 19 ¶
	Payload:		Payload:
	9b 01 7a 5f 00 f0 01 00 88 00 00 00 20 02 0d b8		9b 01 7a 5f 00 f0 01 00 88 00 00 00 20 02 0d b8
	00 00 00 00 00 00 00 ff fe 00 fa ce 04 0e 00 14		00 00 00 00 00 00 00 ff fe 00 fa ce 04 0e 00 14
	09 ff 00 00 01 00 00 00 00 00 00 00 08 1e 80 20		09 ff 00 00 01 00 00 00 00 00 00 00 08 1e 80 20
	ff ff ff ff ff ff ff ff 00 00 00 00 20 02 0d b8		ff ff ff ff ff ff ff ff 00 00 00 00 20 02 0d b8
	00 00 00 00 00 00 00 ff fe 00 fa ce 03 0e 40 00		00 00 00 00 00 00 00 ff fe 00 fa ce 03 0e 40 00
	ff ff ff ff 20 02 0d b8 00 00 00 00		ff ff ff ff 20 02 0d b8 00 00 00 00
	Dictionary:		Dictionary:
	fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23		fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23
	ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 1a		ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 1a
	00 00 00 5c 00 00 00 3a 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	copy: 06 9b 01 7a 5f 00 f0		copy: 06 9b 01 7a 5f 00 f0
	ref(9): 01 00 -> ref 11nnnkkk 0 7: c7		ref(9): 01 00 -> ref 11nnnkkk 0 7: c7
	copy: 01 88		copy: 01 88
	3 nulls: 81		3 nulls: 81
	copy: 04 20 02 0d b8		copy: 04 20 02 0d b8
	7 nulls: 85		7 nulls: 85
	ref(68): ff fe 00 -> ref 101nssss 0 8/11nnnkkk 1 1: a8 c9		ref(60): ff fe 00 -> ref 101nssss 0 7/11nnnkkk 1 1: a7 c9
	copy: 08 fa ce 04 0e 00 14 09 ff		copy: 08 fa ce 04 0e 00 14 09 ff
	ref(39): 00 00 01 00 00 -> ref 101nssss 0 4/11nnnkkk 3 2: a4 da		ref(39): 00 00 01 00 00 -> ref 101nssss 0 4/11nnnkkk 3 2: a4 da
	5 nulls: 83		5 nulls: 83
	copy: 06 08 1e 80 20 ff ff		copy: 06 08 1e 80 20 ff ff
	ref(2): ff ff -> ref 11nnnkkk 0 0: c0		ref(2): ff ff -> ref 11nnnkkk 0 0: c0
	ref(4): ff ff ff ff -> ref 11nnnkkk 2 0: d0		ref(4): ff ff ff ff -> ref 11nnnkkk 2 0: d0
	4 nulls: 82		4 nulls: 82
	ref(48): 20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 fa ce		ref(48): 20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 fa ce
	-> ref 101nssss 1 4/11nnnkkk 6 0: b4 f0		-> ref 101nssss 1 4/11nnnkkk 6 0: b4 f0
	copy: 03 03 0e 40		copy: 03 03 0e 40
	ref(9): 00 ff -> ref 11nnnkkk 0 7: c7		ref(9): 00 ff -> ref 11nnnkkk 0 7: c7
	ref(28): ff ff ff -> ref 101nssss 0 3/11nnnkkk 1 1: a3 c9		ref(28): ff ff ff -> ref 101nssss 0 3/11nnnkkk 1 1: a3 c9
	ref(24): 20 02 0d b8 00 00 00 00		ref(24): 20 02 0d b8 00 00 00 00
	-> ref 101nssss 0 2/11nnnkkk 6 0: a2 f0		-> ref 101nssss 0 2/11nnnkkk 6 0: a2 f0
	Compressed:		Compressed:
	06 9b 01 7a 5f 00 f0 c7 01 88 81 04 20 02 0d b8		06 9b 01 7a 5f 00 f0 c7 01 88 81 04 20 02 0d b8
	85 a8 c9 08 fa ce 04 0e 00 14 09 ff a4 da 83 06		85 a7 c9 08 fa ce 04 0e 00 14 09 ff a4 da 83 06
	08 1e 80 20 ff ff c0 d0 82 b4 f0 03 03 0e 40 c7		08 1e 80 20 ff ff c0 d0 82 b4 f0 03 03 0e 40 c7
	a3 c9 a2 f0		a3 c9 a2 f0
	Was 92 bytes; compressed to 52 bytes, compression factor 1.77		Was 92 bytes; compressed to 52 bytes, compression factor 1.77
	Figure 9: A longer RPL example		Figure 9: A longer RPL example
	Similarly, Figure 10 shows an RPL DAO message. One of the embedded		Similarly, Figure 10 shows an RPL DAO message. One of the embedded
	addresses is copied right out of the pseudo-header, the other one is		addresses is copied right out of the pseudo-header, the other one is
	effectively converted from global to local by providing the prefix		effectively converted from global to local by providing the prefix
	FE80 literally, inserting a number of nulls, and copying (some of)		FE80 literally, inserting a number of nulls, and copying (some of)
	skipping to change at page 15, line 26 ¶		skipping to change at page 15, line 26 ¶
	00 00 00 ff fe 00 33 44 20 02 0d b8 00 00 00 00		00 00 00 ff fe 00 33 44 20 02 0d b8 00 00 00 00
	00 00 00 ff fe 00 11 22		00 00 00 ff fe 00 11 22
	Payload:		Payload:
	9b 02 58 7d 01 80 00 f1 05 12 00 80 20 02 0d b8		9b 02 58 7d 01 80 00 f1 05 12 00 80 20 02 0d b8
	00 00 00 00 00 00 00 ff fe 00 33 44 06 14 00 80		00 00 00 00 00 00 00 ff fe 00 33 44 06 14 00 80
	f1 00 fe 80 00 00 00 00 00 00 00 00 00 ff fe 00		f1 00 fe 80 00 00 00 00 00 00 00 00 00 ff fe 00
	11 22		11 22
	Dictionary:		Dictionary:
	20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 33 44		20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 33 44
	20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 11 22		20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 11 22
	00 00 00 32 00 00 00 3a 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	copy: 0c 9b 02 58 7d 01 80 00 f1 05 12 00 80		copy: 0c 9b 02 58 7d 01 80 00 f1 05 12 00 80
	ref(68): 20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 33 44		ref(60): 20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 33 44
	-> ref 101nssss 1 6/11nnnkkk 6 4: b6 f4		-> ref 101nssss 1 5/11nnnkkk 6 4: b5 f4
	copy: 08 06 14 00 80 f1 00 fe 80		copy: 08 06 14 00 80 f1 00 fe 80
	9 nulls: 87		9 nulls: 87
	ref(74): ff fe 00 11 22 -> ref 101nssss 0 8/11nnnkkk 3 5: a8 dd		ref(66): ff fe 00 11 22 -> ref 101nssss 0 7/11nnnkkk 3 5: a7 dd
	Compressed:		Compressed:
	0c 9b 02 58 7d 01 80 00 f1 05 12 00 80 b6 f4 08		0c 9b 02 58 7d 01 80 00 f1 05 12 00 80 b5 f4 08
	06 14 00 80 f1 00 fe 80 87 a8 dd		06 14 00 80 f1 00 fe 80 87 a7 dd
	Was 50 bytes; compressed to 27 bytes, compression factor 1.85		Was 50 bytes; compressed to 27 bytes, compression factor 1.85
	Figure 10: An RPL DAO message		Figure 10: An RPL DAO message
	Figure 11 shows the effect of compressing a simple ND neighbor		Figure 11 shows the effect of compressing a simple ND neighbor
	solicitation.		solicitation.
	IP header:		IP header:
	60 00 00 00 00 30 3a ff 20 02 0d b8 00 00 00 00		60 00 00 00 00 30 3a ff 20 02 0d b8 00 00 00 00
	00 00 00 ff fe 00 3b d3 fe 80 00 00 00 00 00 00		00 00 00 ff fe 00 3b d3 fe 80 00 00 00 00 00 00
	02 1c da ff fe 00 30 23		02 1c da ff fe 00 30 23
	Payload:		Payload:
	87 00 a7 68 00 00 00 00 fe 80 00 00 00 00 00 00		87 00 a7 68 00 00 00 00 fe 80 00 00 00 00 00 00
	02 1c da ff fe 00 30 23 01 01 3b d3 00 00 00 00		02 1c da ff fe 00 30 23 01 01 3b d3 00 00 00 00
	1f 02 00 00 00 00 00 06 00 1c da ff fe 00 20 24		1f 02 00 00 00 00 00 06 00 1c da ff fe 00 20 24
	Dictionary:		Dictionary:
	20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 3b d3		20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 3b d3
	fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23		fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23
	00 00 00 30 00 00 00 3a 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	copy: 04 87 00 a7 68		copy: 04 87 00 a7 68
	4 nulls: 82		4 nulls: 82
	ref(48): fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23		ref(40): fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23
	-> ref 101nssss 1 4/11nnnkkk 6 0: b4 f0		-> ref 101nssss 1 3/11nnnkkk 6 0: b3 f0
	copy: 04 01 01 3b d3		copy: 04 01 01 3b d3
	4 nulls: 82		4 nulls: 82
	copy: 02 1f 02		copy: 02 1f 02
	5 nulls: 83		5 nulls: 83
	copy: 02 06 00		copy: 02 06 00
	ref(24): 1c da ff fe 00 -> ref 101nssss 0 2/11nnnkkk 3 3: a2 db		ref(24): 1c da ff fe 00 -> ref 101nssss 0 2/11nnnkkk 3 3: a2 db
	copy: 02 20 24		copy: 02 20 24
	Compressed:		Compressed:
	04 87 00 a7 68 82 b4 f0 04 01 01 3b d3 82 02 1f		04 87 00 a7 68 82 b3 f0 04 01 01 3b d3 82 02 1f
	02 83 02 06 00 a2 db 02 20 24		02 83 02 06 00 a2 db 02 20 24
	Was 48 bytes; compressed to 26 bytes, compression factor 1.85		Was 48 bytes; compressed to 26 bytes, compression factor 1.85
	Figure 11: An ND neighbor solicitation		Figure 11: An ND neighbor solicitation
	Figure 12 shows the compression of an ND neighbor advertisement.		Figure 12 shows the compression of an ND neighbor advertisement.
	IP header:		IP header:
	60 00 00 00 00 30 3a fe fe 80 00 00 00 00 00 00		60 00 00 00 00 30 3a fe fe 80 00 00 00 00 00 00
	02 1c da ff fe 00 30 23 20 02 0d b8 00 00 00 00		02 1c da ff fe 00 30 23 20 02 0d b8 00 00 00 00
	00 00 00 ff fe 00 3b d3		00 00 00 ff fe 00 3b d3
	Payload:		Payload:
	88 00 26 6c c0 00 00 00 fe 80 00 00 00 00 00 00		88 00 26 6c c0 00 00 00 fe 80 00 00 00 00 00 00
	02 1c da ff fe 00 30 23 02 01 fa ce 00 00 00 00		02 1c da ff fe 00 30 23 02 01 fa ce 00 00 00 00
	1f 02 00 00 00 00 00 06 00 1c da ff fe 00 20 24		1f 02 00 00 00 00 00 06 00 1c da ff fe 00 20 24
	Dictionary:		Dictionary:
	fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23		fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23
	20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 3b d3		20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 3b d3
	00 00 00 30 00 00 00 3a 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	copy: 05 88 00 26 6c c0		copy: 05 88 00 26 6c c0
	3 nulls: 81		3 nulls: 81
	ref(64): fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23		ref(56): fe 80 00 00 00 00 00 00 02 1c da ff fe 00 30 23
	-> ref 101nssss 1 6/11nnnkkk 6 0: b6 f0		-> ref 101nssss 1 5/11nnnkkk 6 0: b5 f0
	copy: 04 02 01 fa ce		copy: 04 02 01 fa ce
	4 nulls: 82		4 nulls: 82
	copy: 02 1f 02		copy: 02 1f 02
	5 nulls: 83		5 nulls: 83
	copy: 02 06 00		copy: 02 06 00
	ref(24): 1c da ff fe 00 -> ref 101nssss 0 2/11nnnkkk 3 3: a2 db		ref(24): 1c da ff fe 00 -> ref 101nssss 0 2/11nnnkkk 3 3: a2 db
	copy: 02 20 24		copy: 02 20 24
	Compressed:		Compressed:
	05 88 00 26 6c c0 81 b6 f0 04 02 01 fa ce 82 02		05 88 00 26 6c c0 81 b5 f0 04 02 01 fa ce 82 02
	1f 02 83 02 06 00 a2 db 02 20 24		1f 02 83 02 06 00 a2 db 02 20 24
	Was 48 bytes; compressed to 27 bytes, compression factor 1.78		Was 48 bytes; compressed to 27 bytes, compression factor 1.78
	Figure 12: An ND neighbor advertisement		Figure 12: An ND neighbor advertisement
	Figure 13 shows the compression of an ND router solicitation. Note		Figure 13 shows the compression of an ND router solicitation. Note
	that the relatively good compression is not caused by the many zero		that the relatively good compression is not caused by the many zero
	bytes in the link-layer address of this particular capture (which are		bytes in the link-layer address of this particular capture (which are
	unlikely to occur in practice): 7 of these 8 bytes are copied from		unlikely to occur in practice): 7 of these 8 bytes are copied from
	the pseudo-header (the 8th byte cannot be copied as the universal/		the pseudo-header (the 8th byte cannot be copied as the universal/
	skipping to change at page 18, line 22 ¶		skipping to change at page 18, line 22 ¶
	IP header:		IP header:
	60 00 00 00 00 18 3a ff fe 80 00 00 00 00 00 00		60 00 00 00 00 18 3a ff fe 80 00 00 00 00 00 00
	ae de 48 00 00 00 00 01 ff 02 00 00 00 00 00 00		ae de 48 00 00 00 00 01 ff 02 00 00 00 00 00 00
	00 00 00 00 00 00 00 02		00 00 00 00 00 00 00 02
	Payload:		Payload:
	85 00 90 65 00 00 00 00 01 02 ac de 48 00 00 00		85 00 90 65 00 00 00 00 01 02 ac de 48 00 00 00
	00 01 00 00 00 00 00 00		00 01 00 00 00 00 00 00
	Dictionary:		Dictionary:
	fe 80 00 00 00 00 00 00 ae de 48 00 00 00 00 01		fe 80 00 00 00 00 00 00 ae de 48 00 00 00 00 01
	ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 02		ff 02 00 00 00 00 00 00 00 00 00 00 00 00 00 02
	00 00 00 18 00 00 00 3a 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	copy: 04 85 00 90 65		copy: 04 85 00 90 65
	ref(11): 00 00 00 00 01 -> ref 11nnnkkk 3 6: de		ref(11): 00 00 00 00 01 -> ref 11nnnkkk 3 6: de
	copy: 02 02 ac		copy: 02 02 ac
	ref(58): de 48 00 00 00 00 01		ref(50): de 48 00 00 00 00 01
	-> ref 101nssss 0 6/11nnnkkk 5 3: a6 eb		-> ref 101nssss 0 5/11nnnkkk 5 3: a5 eb
	6 nulls: 84		6 nulls: 84
	Compressed:		Compressed:
	04 85 00 90 65 de 02 02 ac a6 eb 84		04 85 00 90 65 de 02 02 ac a5 eb 84
	Was 24 bytes; compressed to 12 bytes, compression factor 2.00		Was 24 bytes; compressed to 12 bytes, compression factor 2.00
	Figure 13: An ND router solicitation		Figure 13: An ND router solicitation
	Figure 14 shows the compression of an ND router advertisement. The		Figure 14 shows the compression of an ND router advertisement. The
	indefinite lifetime is compressed to four bytes by backreferencing;		indefinite lifetime is compressed to four bytes by backreferencing;
	this could be improved (at the cost of minor additional decompressor		this could be improved (at the cost of minor additional decompressor
	complexity) by including some simple runlength mechanism.		complexity) by including some simple runlength mechanism.
	IP header:		IP header:
	skipping to change at page 19, line 19 ¶		skipping to change at page 19, line 19 ¶
	Payload:		Payload:
	86 00 55 c9 40 00 0f a0 1c 5a 38 17 00 00 07 d0		86 00 55 c9 40 00 0f a0 1c 5a 38 17 00 00 07 d0
	01 01 11 22 00 00 00 00 03 04 40 40 ff ff ff ff		01 01 11 22 00 00 00 00 03 04 40 40 ff ff ff ff
	ff ff ff ff 00 00 00 00 20 02 0d b8 00 00 00 00		ff ff ff ff 00 00 00 00 20 02 0d b8 00 00 00 00
	00 00 00 00 00 00 00 00 20 02 40 10 00 00 03 e8		00 00 00 00 00 00 00 00 20 02 40 10 00 00 03 e8
	20 02 0d b8 00 00 00 00 21 03 00 01 00 00 00 00		20 02 0d b8 00 00 00 00 21 03 00 01 00 00 00 00
	20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 11 22		20 02 0d b8 00 00 00 00 00 00 00 ff fe 00 11 22
	Dictionary:		Dictionary:
	fe 80 00 00 00 00 00 00 10 34 00 ff fe 00 11 22		fe 80 00 00 00 00 00 00 10 34 00 ff fe 00 11 22
	fe 80 00 00 00 00 00 00 ae de 48 00 00 00 00 01		fe 80 00 00 00 00 00 00 ae de 48 00 00 00 00 01
	00 00 00 60 00 00 00 3a 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	copy: 0c 86 00 55 c9 40 00 0f a0 1c 5a 38 17		copy: 0c 86 00 55 c9 40 00 0f a0 1c 5a 38 17
	2 nulls: 80		2 nulls: 80
	copy: 06 07 d0 01 01 11 22		copy: 06 07 d0 01 01 11 22
	4 nulls: 82		4 nulls: 82
	copy: 06 03 04 40 40 ff ff		copy: 06 03 04 40 40 ff ff
	ref(2): ff ff -> ref 11nnnkkk 0 0: c0		ref(2): ff ff -> ref 11nnnkkk 0 0: c0
	ref(4): ff ff ff ff -> ref 11nnnkkk 2 0: d0		ref(4): ff ff ff ff -> ref 11nnnkkk 2 0: d0
	4 nulls: 82		4 nulls: 82
	copy: 04 20 02 0d b8		copy: 04 20 02 0d b8
	12 nulls: 8a		12 nulls: 8a
	copy: 04 20 02 40 10		copy: 04 20 02 40 10
	ref(38): 00 00 03 -> ref 101nssss 0 4/11nnnkkk 1 3: a4 cb		ref(38): 00 00 03 -> ref 101nssss 0 4/11nnnkkk 1 3: a4 cb
	copy: 01 e8		copy: 01 e8
	ref(24): 20 02 0d b8 00 00 00 00		ref(24): 20 02 0d b8 00 00 00 00
	-> ref 101nssss 0 2/11nnnkkk 6 0: a2 f0		-> ref 101nssss 0 2/11nnnkkk 6 0: a2 f0
	copy: 02 21 03		copy: 02 21 03
	ref(84): 00 01 00 00 00 00		ref(84): 00 01 00 00 00 00
	-> ref 101nssss 0 9/11nnnkkk 4 6: a9 e6		-> ref 101nssss 0 9/11nnnkkk 4 6: a9 e6
	ref(40): 20 02 0d b8 00 00 00 00 00 00 00		ref(40): 20 02 0d b8 00 00 00 00 00 00 00
	-> ref 101nssss 1 3/11nnnkkk 1 5: b3 cd		-> ref 101nssss 1 3/11nnnkkk 1 5: b3 cd
	ref(136): ff fe 00 11 22		ref(128): ff fe 00 11 22
	-> ref 101nssss 0 15/101nssss 0 1/11nnnkkk 3 3: af a1 db		-> ref 101nssss 0 15/11nnnkkk 3 3: af db
	Compressed:		Compressed:
	0c 86 00 55 c9 40 00 0f a0 1c 5a 38 17 80 06 07		0c 86 00 55 c9 40 00 0f a0 1c 5a 38 17 80 06 07
	d0 01 01 11 22 82 06 03 04 40 40 ff ff c0 d0 82		d0 01 01 11 22 82 06 03 04 40 40 ff ff c0 d0 82
	04 20 02 0d b8 8a 04 20 02 40 10 a4 cb 01 e8 a2		04 20 02 0d b8 8a 04 20 02 40 10 a4 cb 01 e8 a2
	f0 02 21 03 a9 e6 b3 cd af a1 db		f0 02 21 03 a9 e6 b3 cd af db
	Was 96 bytes; compressed to 59 bytes, compression factor 1.63		Was 96 bytes; compressed to 58 bytes, compression factor 1.66
	Figure 14: An ND router advertisement		Figure 14: An ND router advertisement
	Figure 15 shows the compression of a DTLS application data packet		Figure 15 shows the compression of a DTLS application data packet
	with a net payload of 13 bytes of cleartext, and 8 bytes of		with a net payload of 13 bytes of cleartext, and 8 bytes of
	authenticator (note that the IP header is not relevant for this		authenticator (note that the IP header is not relevant for this
	example and has been set to 0). This makes good use of the static		example and has been set to 0). This makes good use of the static
	dictionary, and is quite effective crunching out the redundancy in		dictionary, and is quite effective crunching out the redundancy in
	the TLS_PSK_WITH_AES_128_CCM_8 header, leading to a net reduction by		the TLS_PSK_WITH_AES_128_CCM_8 header, leading to a net reduction by
	15 bytes.		15 bytes.
	skipping to change at page 20, line 24 ¶		skipping to change at page 20, line 21 ¶
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00
	Payload:		Payload:
	17 fe fd 00 01 00 00 00 00 00 01 00 1d 00 01 00		17 fe fd 00 01 00 00 00 00 00 01 00 1d 00 01 00
	00 00 00 00 01 09 b2 0e 82 c1 6e b6 96 c5 1f 36		00 00 00 00 01 09 b2 0e 82 c1 6e b6 96 c5 1f 36
	8d 17 61 e2 b5 d4 22 d4 ed 2b		8d 17 61 e2 b5 d4 22 d4 ed 2b
	Dictionary:		Dictionary:
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 2a 00 00 00 00 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	ref(13): 17 fe fd 00 01 00 00 00 00 00 01 00		ref(13): 17 fe fd 00 01 00 00 00 00 00 01 00
	-> ref 101nssss 1 0/11nnnkkk 2 1: b0 d1		-> ref 101nssss 1 0/11nnnkkk 2 1: b0 d1
	copy: 01 1d		copy: 01 1d
	ref(10): 00 01 00 00 00 00 00 01 -> ref 11nnnkkk 6 2: f2		ref(10): 00 01 00 00 00 00 00 01 -> ref 11nnnkkk 6 2: f2
	copy: 15 09 b2 0e 82 c1 6e b6 96 c5 1f 36 8d 17 61 e2		copy: 15 09 b2 0e 82 c1 6e b6 96 c5 1f 36 8d 17 61 e2
	copy: b5 d4 22 d4 ed 2b		copy: b5 d4 22 d4 ed 2b
	Compressed:		Compressed:
	b0 d1 01 1d f2 15 09 b2 0e 82 c1 6e b6 96 c5 1f		b0 d1 01 1d f2 15 09 b2 0e 82 c1 6e b6 96 c5 1f
	36 8d 17 61 e2 b5 d4 22 d4 ed 2b		36 8d 17 61 e2 b5 d4 22 d4 ed 2b
	Was 42 bytes; compressed to 27 bytes, compression factor 1.56		Was 42 bytes; compressed to 27 bytes, compression factor 1.56
	skipping to change at page 21, line 21 ¶		skipping to change at page 21, line 21 ¶
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00
	Payload:		Payload:
	17 fe fd 00 01 00 00 00 00 00 05 00 16 00 01 00		17 fe fd 00 01 00 00 00 00 00 05 00 16 00 01 00
	00 00 00 00 05 ae a0 15 56 67 92 4d ff 8a 24 e4		00 00 00 00 05 ae a0 15 56 67 92 4d ff 8a 24 e4
	cb 35 b9		cb 35 b9
	Dictionary:		Dictionary:
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 23 00 00 00 00 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	ref(13): 17 fe fd 00 01 00 00 00 00 00		ref(13): 17 fe fd 00 01 00 00 00 00 00
	-> ref 101nssss 1 0/11nnnkkk 0 3: b0 c3		-> ref 101nssss 1 0/11nnnkkk 0 3: b0 c3
	copy: 03 05 00 16		copy: 03 05 00 16
	ref(10): 00 01 00 00 00 00 00 05 -> ref 11nnnkkk 6 2: f2		ref(10): 00 01 00 00 00 00 00 05 -> ref 11nnnkkk 6 2: f2
	copy: 0e ae a0 15 56 67 92 4d ff 8a 24 e4 cb 35 b9		copy: 0e ae a0 15 56 67 92 4d ff 8a 24 e4 cb 35 b9
	Compressed:		Compressed:
	b0 c3 03 05 00 16 f2 0e ae a0 15 56 67 92 4d ff		b0 c3 03 05 00 16 f2 0e ae a0 15 56 67 92 4d ff
	8a 24 e4 cb 35 b9		8a 24 e4 cb 35 b9
	Was 35 bytes; compressed to 22 bytes, compression factor 1.59		Was 35 bytes; compressed to 22 bytes, compression factor 1.59
	skipping to change at page 22, line 22 ¶		skipping to change at page 22, line 22 ¶
	00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00
	Payload:		Payload:
	16 fe fd 00 00 00 00 00 00 00 00 00 36 01 00 00		16 fe fd 00 00 00 00 00 00 00 00 00 36 01 00 00
	2a 00 00 00 00 00 00 00 2a fe fd 51 52 ed 79 a4		2a 00 00 00 00 00 00 00 2a fe fd 51 52 ed 79 a4
	20 c9 62 56 11 47 c9 39 ee 6c c0 a4 fe c6 89 2f		20 c9 62 56 11 47 c9 39 ee 6c c0 a4 fe c6 89 2f
	32 26 9a 16 4e 31 7e 9f 20 92 92 00 00 00 02 c0		32 26 9a 16 4e 31 7e 9f 20 92 92 00 00 00 02 c0
	a8 01 00		a8 01 00
	Dictionary:		Dictionary:
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00		00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
	00 00 00 43 00 00 00 00 16 fe fd 17 fe fd 00 01		16 fe fd 17 fe fd 00 01 00 00 00 00 00 01 00 00
	00 00 00 00 00 01 00 00
	ref(16): 16 fe fd -> ref 101nssss 0 1/11nnnkkk 1 5: a1 cd		ref(16): 16 fe fd -> ref 101nssss 0 1/11nnnkkk 1 5: a1 cd
	9 nulls: 87		9 nulls: 87
	copy: 01 36		copy: 01 36
	ref(16): 01 00 00 -> ref 101nssss 0 1/11nnnkkk 1 5: a1 cd		ref(16): 01 00 00 -> ref 101nssss 0 1/11nnnkkk 1 5: a1 cd
	copy: 01 2a		copy: 01 2a
	7 nulls: 85		7 nulls: 85
	copy: 23 2a fe fd 51 52 ed 79 a4 20 c9 62 56 11 47 c9		copy: 23 2a fe fd 51 52 ed 79 a4 20 c9 62 56 11 47 c9
	copy: 39 ee 6c c0 a4 fe c6 89 2f 32 26 9a 16 4e 31 7e		copy: 39 ee 6c c0 a4 fe c6 89 2f 32 26 9a 16 4e 31 7e
	copy: 9f 20 92 92		copy: 9f 20 92 92
	3 nulls: 81		3 nulls: 81
End of changes. 24 change blocks.
	41 lines changed or deleted		31 lines changed or added
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