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address
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... destinations are hosts identified by
fixed length addresses. The internet protocol also provides for
fragmentation ...
... datagram. The TCP module would provide the
addresses and other parameters in the internet header to the internet ...
... IMP. The
ARPANET address would be derived from the internet address by the
local network interface ...
... ARPANET address would be derived from the internet address by the
local network interface and would be the address ...
... internet address by the
local network interface and would be the address of some host in the
ARPANET ...
... networks. These modules share common rules for
interpreting address fields and for fragmenting and assembling
internet datagrams ...
... internet module to send that data as a datagram and passes the
destination address and other parameters as arguments of the call.
...
... to it. The internet module determines a local network address for
this internet address, in this case it is the address ...
... internet module. The internet module
determines from the internet address that the datagram is to be
forwarded to another host ...
... network. The internet module
determines a local net address for the destination host. It calls
on the local network interface ...
... application program in this host. It passes the data to the
application program in response to a system call, passing the source
address and other parameters as results of the call.
...
... internet module to another through individual networks based on the
interpretation of an internet address. Thus, one important mechanism
of the internet protocol is the internet address ...
... internet address. Thus, one important mechanism
of the internet protocol is the internet address.
...
...
A distinction is made between names, addresses, and routes [4]. A
name indicates what we seek. An address ...
... addresses, and routes [4]. A
name indicates what we seek. An address indicates where it is. A
route indicates how to get there. The internet protocol ...
... route indicates how to get there. The internet protocol deals
primarily with addresses. It is the task of higher level (i.e.,
host-to-host or application) protocols to make the mapping from
...
... host-to-host or application) protocols to make the mapping from
names to addresses. The internet module maps internet addresses to
...
... names to addresses. The internet module maps internet addresses to
local net addresses. It is the task of lower level (i.e., local net
...
... internet module maps internet addresses to
local net addresses. It is the task of lower level (i.e., local net
or gateways) procedures to make the mapping from local net addresses ...
... addresses. It is the task of lower level (i.e., local net
or gateways) procedures to make the mapping from local net addresses
to routes.
...
... Addresses are fixed length of four octets (32 bits). An address
begins with a network number, followed by local address ...
... address
begins with a network number, followed by local address (called the
"rest" field). There are three formats or classes of internet
addresses ...
... local address (called the
"rest" field). There are three formats or classes of internet
addresses: in class a, the high order bit is zero, the next 7 bits ...
... are the network, and the last 24 bits are the local address; in
class b, the high order two bits ...
... the network and the last 16 bits are the local address; in class c,
the high order three bits ...
... Care must be taken in mapping internet addresses to local net
addresses; a single physical host must be able to act as if it were
...
... several distinct hosts to the extent of using several distinct
internet addresses. Some hosts will also have several physical
interfaces (multi-homing ...
... host to have several physical
interfaces to the network with each having several logical internet
addresses.
...
... Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Source Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Address ...
... Source Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Options | Padding |
...
... 32 bits
The destination address. See section 3.2.
Options: variable
...
... data. The third octet is the pointer into the route data
indicating the octet which begins the next source address to be
processed. The pointer is relative to this option, and the
smallest legal value for the pointer is 4.
...
...
A route data is composed of a series of internet addresses.
Each internet address is 32 bits ...
... route data is composed of a series of internet addresses.
Each internet address is 32 bits or 4 octets. If the pointer is
...
... destination address field.
If the address in destination address field has been reached and
the pointer is not greater than the length, the next address ...
...
If the address in destination address field has been reached and
the pointer is not greater than the length, the next address in
...
... address in destination address field has been reached and
the pointer is not greater than the length, the next address in
the source route replaces the address ...
... address in
the source route replaces the address in the destination address
field, and the recorded route address ...
... the source route replaces the address in the destination address
field, and the recorded route address replaces the source
address ...
... address in the destination address
field, and the recorded route address replaces the source
address just used, and pointer is increased by four.
...
... destination address
field, and the recorded route address replaces the source
address just used, and pointer is increased by four.
The recorded route ...
...
The recorded route address is the internet module's own internet
address as known in the environment into which this datagram ...
... route address is the internet module's own internet
address as known in the environment into which this datagram is
being forwarded.
...
... data. The third octet is the pointer into the route data
indicating the octet which begins the next source address to be
processed. The pointer is relative to this option, and the
smallest legal value for the pointer is 4.
...
...
A route data is composed of a series of internet addresses.
Each internet address is 32 bits ...
... route data is composed of a series of internet addresses.
Each internet address is 32 bits or 4 octets. If the pointer is
...
... destination address field.
If the address in destination address field has been reached and
the pointer is not greater than the length, the next address ...
...
If the address in destination address field has been reached and
the pointer is not greater than the length, the next address in
...
... address in destination address field has been reached and
the pointer is not greater than the length, the next address in
the source route replaces the address ...
... address in
the source route replaces the address in the destination address
field, and the recorded route address ...
... the source route replaces the address in the destination address
field, and the recorded route address replaces the source
address ...
... address in the destination address
field, and the recorded route address replaces the source
address just used, and pointer is increased by four.
...
... destination address
field, and the recorded route address replaces the source
address just used, and pointer is increased by four.
The recorded route ...
...
The recorded route address is the internet module's own internet
address as known in the environment into which this datagram ...
... route address is the internet module's own internet
address as known in the environment into which this datagram is
being forwarded.
...
... IP must send the datagram directly to the next address in the
source route through only the directly connected network ...
... source route through only the directly connected network
indicated in the next address to reach the next gateway or host
...
... indicating the octet which begins the next area to store a route
address. The pointer is relative to this option, and the
smallest legal value for the pointer is 4.
...
...
A recorded route is composed of a series of internet addresses.
Each internet address is 32 bits ...
... route is composed of a series of internet addresses.
Each internet address is 32 bits or 4 octets. If the pointer is
...
... host must compose this option with a large
enough route data area to hold all the address expected. The
size of the option does not change due to adding addresses. The
...
... route data area to hold all the address expected. The
size of the option does not change due to adding addresses. The
intitial contents of the route data area must be zero.
...
... the record route option is present. If it is, it inserts its
own internet address as known in the environment into which this
datagram is being forwarded into the recorded route ...
... route data area is already full (the pointer exceeds the
length) the datagram is forwarded without inserting the address
into the recorded route. If there is some room but not enough
...
... into the recorded route. If there is some room but not enough
room for a full address to be inserted, the original datagram is
considered to be in error and is discarded. In either case an
...
... |01000100| length | pointer|oflw|flg|
+--------+--------+--------+--------+
| internet address |
+--------+--------+--------+--------+
| timestamp ...
... registers its timestamp if it matches its own
address with the next specified internet address.
...
... timestamp if it matches its own
address with the next specified internet address.
The Timestamp ...
... timestamps. The intitial contents of the timestamp data area
must be zero or internet address/zero pairs.
If the timestamp ...
...
To provide for flexibility in assigning address to networks and
allow for the large number of small to intermediate sized networks ...
... allow for the large number of small to intermediate sized networks
the interpretation of the address field is coded to specify a small
number of networks with a large number of host ...
...
Address Formats:
...
... network/host interfaces that allows several internet addresses to
correspond to one interface. It must also be allowed for a host ...
... Address mappings between internet addresses and addresses for
ARPANET, SATNET, PRNET, and other networks ...
... The internet identification field (ID) is used together with the
source and destination address, and the protocol fields, to identify
datagram ...
... where:
src = source address
dst = destination address
...
...
The source address is included in the send call in case the sending
host has several addresses ...
... source address is included in the send call in case the sending
host has several addresses (multiple physical connections or logical
addresses ...
... addresses (multiple physical connections or logical
addresses). The internet module must check to see that the source
address is one of the legal address ...
... addresses). The internet module must check to see that the source
address is one of the legal address for this host.
...
... addresses). The internet module must check to see that the source
address is one of the legal address for this host.
...
... header checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address ...
... source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| data |
...
... header checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address ...
... source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| data |
...
... Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address ...
... source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| data |
...
... Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address ...
... source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| data |
...
... Header Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address ...
... source address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| destination address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Opt. Code = x | Opt. Len.= 3 | option value | Opt. Code = x |
...
... Internet Address ...
... A four octet (32 bit) source or destination address consisting
of a Network field and a Local Address ...
... Local Address ...
... internet local address on to the host addresses in a
network is quite general, allowing for many to one mappings. ...
... The local address portion of an Internet Address. ...
... The local address portion of an Internet Address. ...
... Postel, J., "Address Mappings," RFC 796, USC/Information Sciences Institute, September 1981. ...