Thomas Kunz
Systems and Computer Engineering
25
Encapsulation II
nMinimal encapsulation (optional)
–avoids
repetition of identical fields
–e.g. TTL,
IHL, version, DS (RFC 2474, old: TOS)
–only
applicable for unfragmented packets, no space left for fragment identification
care-of address COA
IP address of HA
TTL
IP identification
min. encap.
IP checksum
flags
fragment offset
length
DS (TOS)
ver.
IHL
IP address of MN
original sender IP address (if S=1)
S
lay. 4 protoc.
IP checksum
TCP/UDP/ ... payload
reserved