Tcp/Ip Basics Overview - HP Sa3110 - VPN Server Appliance Manual
Hp vpn server appliance sa3110/sa3150/sa3400/sa3450 - virtual private networking concepts guide
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Also See for Sa3110 - VPN Server Appliance:
- Installation manual (92 pages) ,
- Getting started manual (46 pages) ,
- Release notes (36 pages)
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HP VPN Concepts Guide Overview
Packets and
Packets and
Packets and
Packets and
Packet Headers
Packet Headers
Packet Headers
Packet Headers
IP Address
IP Address
IP Address
IP Address
Subnet Mask
Subnet Mask
Subnet Mask
Subnet Mask
1-6
TCP/IP Basics Overview
TCP/IP Basics Overview
TCP/IP Basics Overview
TCP/IP Basics Overview
The VPN devices operate on Transmission Control Protocol/
Internet Protocol (TCP/IP) networks. TCP/IP is the foundation
of the Internet. To fully appreciate how the VPN devices work,
you need to understand some basic TCP/IP terms.
Communications in a TCP/IP network are broken into small
chunks called packets. The typical maximum packet size carried
over TCP/IP networks is 1500 bytes. Each packet carries some
user data called payload. The payload could be part of an e-mail
message or a Web page. Every packet also has some control
information that indicates where the packet originated, where it
is going, and what application should receive it when it arrives.
This information is referred to as the packet header. A simplified
packet example is shown in the following diagram.
Figure:
Figure: Simple Packet Diagram
Figure:
Figure:
All devices on a TCP/IP network must have at least one address
called an IP address. This address uniquely identifies the device
on a network (actually in the entire world). For example, "Test
Company's" Web server has the following IP address:
205.250.128.2.
There are some reserved IP addresses that are never assigned,
which are called unroutable. Anyone can use these addresses on
a closed network. Well-known unroutable IP addresses start
with 10.x.x.x and 192.168.x.x, where x is any number between 1
and 254.
One function of a subnet mask is to tell a device what other
addresses it can directly communicate with. An example of a
subnet mask is 255.255.255.0, which defines a class C subnet.
Each component of the subnet mask (either 255 or 0 in the
example) is called an octet. A class C subnet mask means that
there are 254 addresses with which the device can directly
communicate.
Hewlett-Packard Company Virtual Private Networking Concepts Guide
Simple Packet Diagram
Simple Packet Diagram
Simple Packet Diagram
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