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... The internet protocol is specifically limited in scope to provide the
functions necessary to deliver a package of bits (an internet
datagram ...
... classes of internet
addresses: in class a, the high order bit is zero, the next 7 bits
are the network ...
... internet
addresses: in class a, the high order bit is zero, the next 7 bits
are the network, and the last 24 bits ...
... local address; in
class b, the high order two bits are one-zero, the next 14 bits are
the network ...
... class b, the high order two bits are one-zero, the next 14 bits are
the network and the last 16 bits ...
... local address; in class c,
the high order three bits are one-one-zero, the next 21 bits are the
network ...
... class c,
the high order three bits are one-one-zero, the next 21 bits are the
network and the last 8 bits ...
... datagram is divided into two portions on a 8 octet (64 bit) boundary
(the second portion might not be an integral multiple of 8 octets,
...
...
Note that each tick mark represents one bit position.
...
... internet header in 32
bit words, and thus points to the beginning of the data. Note that
the minimum value for a correct header is 5.
...
... Throughput, 1 = High Throughput.
Bits 5: 0 = Normal Relibility, 1 = High Relibility.
Bit 6-7: Reserved for Future Use.
...
... Bits 5: 0 = Normal Relibility, 1 = High Relibility.
Bit 6-7: Reserved for Future Use.
0 1 2 3 4 5 6 7
...
... control the access to, and use of, those precedence designations.
Total Length: 16 bits
Total Length is the length of the datagram ...
... headers of higher level protocols.
Identification: 16 bits
An identifying value assigned by the sender ...
... The fragment offset is measured in units of 8 octets (64 bits). The
first fragment has offset zero.
...
... lifetime.
Protocol: 8 bits
This field indicates the next level protocol used in the data
portion ...
...
The checksum field is the 16 bit one's complement of the one's
complement sum of all 16 bit words in the header ...
... checksum field is the 16 bit one's complement of the one's
complement sum of all 16 bit words in the header. For purposes of
computing the checksum ...
...
This option may be used between options, for example, to align
the beginning of a subsequent option on a 32 bit boundary.
May be copied, introduced, or deleted ...
... 11100010 01101011 - (Reserved for future use)
Compartments (C field): 16 bits
An all zero value is used when the information transmitted is
...
... Defense Intelligence Agency.
Handling Restrictions (H field): 16 bits
The values for the control and release markings are
...
... Markings".
Transmission Control Code (TCC field): 24 bits
Provides a means to segregate traffic ...
... internet addresses.
Each internet address is 32 bits or 4 octets. If the pointer is
greater than the length, the source route ...
... internet addresses.
Each internet address is 32 bits or 4 octets. If the pointer is
greater than the length, the source route ...
... internet addresses.
Each internet address is 32 bits or 4 octets. If the pointer is
greater than the length, the recorded route ...
... is greater than the length.
The Overflow (oflw) [4 bits] is the number of IP modules that
cannot register ...
...
The Timestamp is a right-justified, 32-bit timestamp in
milliseconds since midnight UT. If the time is not available in
...
... then any time may be inserted as a timestamp provided the high
order bit of the timestamp field is set to one to indicate the
use of a non-standard value.
...
... Class
--------------- ------------------------------- -----
0 7 bits of net, 24 bits of host a
...
... --------------- ------------------------------- -----
0 7 bits of net, 24 bits of host a
10 14 bits ...
... buffer according to its fragment
offset and length, and bits are set in the fragment block bit
...
... offset and length, and bits are set in the fragment block bit
table corresponding to the fragment blocks received.
...
... fragment completes the
datagram (tested by checking the bits set in the fragment block
table), then the datagram ...
... buffer
(12) IF TDL # 0
(13) AND all RCVBT bits from 0
to (TDL+7)/8 are set
(14) THEN TL <- TDL+(IHL*4)
...
... For example, the ARPANET has a priority bit, and a choice between
"standard" messages (type 0) and "uncontrolled" messages (type 3),
(the choice between single packet and multipacket messages can also
...
... ARPANET would be to set the ARPANET priority bit on since
the Internet precedence is in the upper half of its range ...
...
There are some applications where a few data bit errors are
acceptable while retransmission delays are not. If the internet
protocol ...
...
Note that each tick mark represents one bit position.
...
... internet header consists of five 32 bit words, and the total length of
the datagram is 21 octets. This datagram ...
...
Whenever an octet represents a numeric quantity the left most bit in the
diagram is the high order or most significant bit. That is, the bit ...
... Whenever an octet represents a numeric quantity the left most bit in the
diagram is the high order or most significant bit. That is, the bit
labeled 0 is the most significant bit ...
... bit in the
diagram is the high order or most significant bit. That is, the bit
labeled 0 is the most significant bit. For example, the following
...
... significant bit. That is, the bit
labeled 0 is the most significant bit. For example, the following
diagram represents the value 170 (decimal).
...
... +-+-+-+-+-+-+-+-+
Significance of Bits
Figure 11.
...
...
Similarly, whenever a multi-octet field represents a numeric quantity
the left most bit of the whole field is the most significant bit. When
a multi-octet quantity is transmitted the most significant octet is
...
... Similarly, whenever a multi-octet field represents a numeric quantity
the left most bit of the whole field is the most significant bit. When
a multi-octet quantity is transmitted the most significant octet is
transmitted first.
...
... A unit of transmission used internally in the ARPANET between
IMPs. The maximum size is about 126 octets (1008 bits). ...
... An eight bit byte. ...
... internet header Padding field is used to ensure that the
data begins on 32 bit word boundary. The padding is zero. ...