"GreenXenon" <> wrote in message
news:3bd269e8-4076-42bd-bf34-...
snip
>
> What are "address bits"?
From Wikipedia:
http://en.wikipedia.org/wiki/Data_packet
<quote>
IP packets are composed of a header and payload. The IPv4 packet header
consists of:
1 4 bits that contain the version, that specifies if it's an IPv4 or IPv6
packet,
2 4 bits that contain the Internet Header Length which is the length of
the header in multiples of 4 bytes. Ex. 5 is equal to 20 bytes.
3 8 bits that contain the Type of Service, also referred to as Quality of
Service (QoS), which describes what priority the packet should have,
4 16 bits that contain the length of the packet in bytes,
5 16 bits that contain an identification tag to help reconstruct the
packet from several fragments,
6 3 bits that contain a zero, a flag that says whether the packet is
allowed to be fragmented or not (DF: Don't fragment), and a flag to state
whether more fragments of a packet follow (MF: More Fragments)
7 13 bits that contain the fragment offset, a field to identify which
fragment this packet is attached to,
8 8 bits that contain the Time to live (TTL) which is the number of hops
(router, computer or device along a network) the packet is allowed to pass
before it dies (for example, a packet with a TTL of 16 will be allowed to go
across 16 routers to get to its destination before it is discarded),
9 8 bits that contain the protocol (TCP, UDP, ICMP, etc...)
10 16 bits that contain the Header Checksum, a number used in error
detection,
11 32 bits that contain the source IP address,
12 32 bits that contain the destination address.
After those, optional flags can be added of varied length, which can change
based on the protocol used, then the data that packet carries is added.
</quote>
Items 11 & 12, these are the 'address bits'.
P.