The IPID is the Identification field of the IP protocol packet header which a;long with the source address uniquely identifies the packet. The IPID is used to reassemble the packet should it be fragmented. Every fragement of the packet will then have the same IPID for the destination device identify them all to be a simgle packet.
The IPID is primarily used in the Idle Port Scanning by a hacker where he spoofs a victims IP address to then use it to scan a target network or system. Various Operating Systems generate these IPIDs in different ways.
A firewall is as much as the huge walls of a Fort to block enemies coming into the territory. These are devices or Software which deny access to your computer from anything external. It stops hackers, intruders and other malicious evils from accessing your computer and take any critical information like Bank Account Detials, Credit Card details, Identification Information or even your Business critical information. It is highly advisable to have a Firewall device or a simple software loaded on your computer from these evils. Apart from using firewall, one has to ensure that a proper antivirus software
/ mantispyware software is installed and properly run on the computers to ensure absolute security on the Internet, failing which you always vulnerable to attacks from the Internet.
There are 2 ways that any Network device will get its IP Address. One is manual entry by users / administrators while the other is automatic called DHCP. A DHCP server in the network (locally) or at your ISP (Public) does this job. Normally, most if not all computers and network devices are setup to look for a DHCP server and obtain IP Address.
Well, there is no actual difference between these addresses except for the fact that a set of address are reserved for private use and can be used by anyone to use locally on their network. Unlike, the Public IP Address are assigned by your ISP and normally comes at a cost (Home users may not pay for this but are hidden in your Internet charges). Additional Public Address can be purchased, in other words, leased from the ISPs to host servers of your own on the Internet.
On the other hand, Public IP is the face of any network device or a computer on the Internet. This address is the valid address normally assigned by your Internet Service Provider to your network or your computer.
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