Thursday, March 24, 2011

How do I reset Windows Update components?

This article helps you reset the Windows Update components.

Sunday, March 13, 2011

Class A Host/Subnet Table

Class A Host/Subnet Table

Class A
Number of
Bits Borrowed            Subnet         Effective     Number of      Number of Subnet
from Host Portion        Mask           Subnets       Hosts/Subnet   Mask Bits
-------               ---------------   ---------     -------------  -------------
  1                      2       8388606           /9
  2                      4       4194302           /10
  3                      8       2097150           /11
  4                     16       1048574           /12
  5                     32        524286           /13
  6                     64        262142           /14
  7                    128        131070           /15
  8                    256         65534           /16
  9                  512         32766           /17
  10                1024         16382           /18
  11                2048          8190           /19
  12                4096          4094           /20
  13                8192          2046           /21
  14               16384          1022           /22
  15               32768           510           /23
  16               65536           254           /24
  17            131072           126           /25
  18            262144            62           /26
  19            524288            30           /27
  20           1048576            14           /28
  21           2097152             6           /29
  22           4194304             2           /30
  23           8388608             2*          /31

Saturday, March 12, 2011

Multi-NAT Router Networks

Taken from: 
Multi-NAT Router Networks
Configuration Details

NAT router default settings are designed to allow a router (one router) to be dropped into an existing network — inserted between a cable or DSL modem and the computer it was previously connected to — without requiring any configuration changes of any equipment — modem, router, or computer. But when multiple NAT routers will be used to create more complex network topologies, some customization is usually needed. A bit more understanding of NAT router operation will clarify what's going on and guide you toward making the required router configuration changes needed to create more complex networks.
What is a Router ?
Stated as clearly as possible: A router is a device used to interconnect separate networks of computers. The individual destination addresses of packets of data arriving at the router are examined and compared to the address ranges of the networks to which the router is connected. If a packet of data is addressed to a machine on another network, the router will briefly assume responsibility for that packet by "routing it" (re-transmitting it) out of the appropriate network connection interface.

In the case of small "two-interface" personal and small office routers, the router is responsible for "routing" traffic between the machines that are NOT in our network and the machines that ARE in our network:

Computers communicating with each other on the same Ethernet network, address and send their data packets directly to each other through an Ethernet switch or hub. But as we saw above, packets addressed to computers that are NOT located on the same local network need to be "routed" to a foreign network. Packets addressed to machines outside of our local network are sent to the local network's "Gateway". Each local network has a "Gateway IP" which is an IP address within the local network's address range. The Ethernet interface with this IP receives any packets that are addressed to any IP outside of our local network. Since our local NAT router serves as the "gateway" for our LAN, the IP address of its LAN interface is known to every computer on the LAN, and it is to that gateway interface that all non-local packets are sent.

There are two key facts to focus on here:

 Computers on a LAN determine whether the destination IP of packets they are sending lies within their LAN's address range. If so, the packet is sent directly to the Ethernet interface of the machine having that IP. But if the destination address of the packet falls outside of the LAN's address range, the packet is sent to the network's gateway Ethernet interface for "routing" toward its destination network.
 Packets arriving at the router's LAN interface with a destination IP falling outside of the LAN's address range are "routed" out of the router's WAN interface.
What is DHCP ?
D.H.C.P. stands for Dynamic Host Configuration Protocol. It is a very slick means by which any computer wanting to participate on a local area network can be automatically assigned an available (not currently in use) IP address and provided with all other important local area network information, such as the IP address of the LAN's gateway interface.

When a computer's network interface has been configured to "obtain its IP address automatically", it sends a "broadcast" throughout the local LAN using a special Ethernet broadcast address which it can use without knowing anything else about the local network's configuration. A listening DHCP server — in this case running and waiting patiently in our NAT router — answers these crys for help by replying with all the specific LAN settings each computer needs to communicate locally and globally. In this fashion, the configuration of individual machines is handled automatically.
NAT Routers are usually also DHCP clients too.
As we've seen, NAT routers contain a DHCP server that is used to automatically configure their client computers on the LAN. But many NAT routers are also DHCP clients of the public Internet ISP.

When the NAT router is powered up, it broadcasts its own DHCP query out of its WAN-side network interface asking the Internet ISP to assign it an available public Internet IP address and to provide it with any other information it will need for communicating over the ISP's network.
This comes into play in "multi-router networks" since the "internal" NAT router will be a DHCP server to the client machines on its LAN, and it will simultaneously be a DHCP client to the external NAT router which serves as its DHCP server.

Public and Private IPs
The scientists and engineers who designed Internet predicted that non-public private networks of machines might want to use the same "IP" Internet Protocol as was used by the global public Internetwork. They realized that "address collision" problems would quickly arise if machines on private "intranets" were using the same IP addresses as machines on the public Internet. If the public and private networks were ever interconnected address ambiguities would arise for the private machines.
To prevent the possibility of public and private IP address collisions, three large ranges of Internet addresses were reserved and set aside in advance for use by private networks:

Network DesignationFirst AddressLast AddressNumber of Addresses,536,048,576,777,216
The IP addresses within these three ranges are forbidden for use on the public Internet. They can, therefore, be freely used, and re-used, within any private network without fear that any machine on the public Internet might be using the same IP as one on a private network. In terms of your own NAT router configuration, this means that whatever you do, you will want to be certain that your NAT router(s) translate their public WAN-side IP into LAN sub-networks that fall completely within these private IP ranges. This also means that you are free to use any of the IP address ranges shown above which your NAT router's configuration options will allow.

Putting it all together . . .
We can distill all of the information above into three simple rules:

 Unless your ISP requires non-DHCP configuration for your primary external NAT router, or you have special needs for establishing fixed addresses for specific machines within your network, you may use your NAT router's built-in DHCP server and client to automatically assign and establish all IP addresses within your network.
 Every NAT router must be configured to use blocks of non-public, private IP addresses shown in the table above.
 Routers decide whether to route local data packets "upstream", out of their WAN port based upon whether or not the packet's destination IP address falls within the local LAN address range. Therefore, the IP address assigned to a router's WAN port must lie outside the address range the router is using for its LAN-side addresses.
Following these two simple rules, a typical two-router configuration could be setup with the external NAT router configured to issue LAN addresses in the 192.168.1.* range and the internal router configured to issue its LAN addresses from the non-overlapping range 192.168.2.*.
Since the internal router's DHCP client would receive an address for its WAN port from the external router's LAN range (192.168.1.*), no address it receives — where the third address byte is "1" — could possibly conflict with any of the 192.168.2.* addresses it will be assigning to its own machines. Therefore the internal router will always be able to determine whether data packets are bound for other machines within its LAN, or need to be "routed" out of its WAN port.
If your routers allow the third number of their LAN networks to be user-specified and configured (as all routers we've seen do), while assigning the final address byte automatically as needed, you can sequentially and uniquely number every NAT router within your network (of any complexity), and use that number as the third address byte assigned to machines within that router's LAN network. In this way, EVERY computer will have a unique private address, none of the private LAN networks will be overlapping, and there will never be any collision with the Internet's public IP space.
Making the electrical connection
Standard Ethernet network cables with standard "RJ-45" Male connectors are wired "straight through". This means that pin 1 at one end is wired to pin 1 at the other end, pin 2 connects to pin 2, and so on for all eight pins. This means that pins which connect to signal outputs at one end of the cable need to connect to signal inputs at the other. This is handled automatically for users by having their RJ-45 Female counterparts available in two different signal arrangements:

PC Ethernet adapters uniformly use one set of pins for inputs and outputs (we'll call it "A-style"), and Ethernet switches and hubs deliberately use the reverse arrangement ("B-style"). This allows PC adapters (A) to be plugged directly into switches and hubs (B) with "straight through" cables.
Since a NAT router's LAN ports are meant to be plugged directly into PCs (A), the router's LAN-side connections have the arrangement of switches and hubs (B). But since a NAT router's WAN port is meant to emulate and take the place of a single PC, its WAN-side connection is that of a PC (A!). This conveniently means that the WAN connection from internal NAT routers, which appear to be PCs, can be plugged directly into the LAN ports of another (external) NAT router using a standard "straight through" Ethernet cable.

So long as you have configured each NAT router on your network to have different and "non-overlapping" WAN-side and LAN-side networks, all of the DHCP clients and servers should interact correctly, and packets should all be routed exactly the way you want.

NAT Router Security Solutions

Taken from:
NAT Router Security Solutions
Tips & Tricks You Haven't Seen Before

What does a NAT router do?
A NAT router creates a local area network (LAN) of private IP addresses and interconnects that LAN to the wide area network (WAN) known as the Internet. The "Network Address Translation" (NAT) performed by the router allows multiple computers (machines) connected to the LAN behind the router to communicate with the external Internet.
The most common use for NAT routers is serving as an "interface" between the global public WAN Internet and a private non-public LAN:

One of the key benefits of NAT routers (and the main reason for their purchase by residential and small office users) is that the router appears to the Internet as a single machine with a single IP address. This effectively masks the fact that many computers on the LAN side of the router may be simultaneously sharing that single IP. This is good for the Internet since it helps to conserve the Net's limited IP space.
There were dire predictions for many years that the Internet was going to "run out" of IP addresses. (And it would have by now!) But the widespread use of NAT routing technology has slowed the "apparent" growth of the Internet by enabling the use of many more machines than IP addresses.
While some ISPs may grumble a bit about the idea of many computers sharing a single "Internet account", they are also relieved, since each ISP has a limited allocation of customer IPs. Therefore, as home and office networks grow in size, NAT routers are ISP-friendly.
A few important bits of terminology we are about to need:
The Internet is called a "packet switched" network because all data moves across it in individual "packets" of data. Each packet contains the source IP address that apparently originated the packet — which is the IP address to which replies will be sent — and the destination IP address which the packet is trying to reach. Many common packets also contain "source port" and "destination port" numbers to give finer granularity to the source and destination addresses.

A NAT Router's Inherent Security
Although NAT routers are not generally purchased for their security benefits, all NAT routers inherently function as very effective hardware firewalls (with a few caveats examined below). As a hardware firewall they prevent "unsolicited", unexpected, unwanted, and potentially annoying or dangerous traffic from the public Internet from passing through the router and entering the user's private LAN network.

The reason they do this is very simple: With multiple "internal" computers on the LAN behind the router, the router must know which internal computer should receive each incoming packet of data. Since ALL incoming packets of data have the same IP address (the single IP address of the router), the only way the router knows which computer should receive the incoming packet is if one of the internal computers on the private LAN FIRST sent data packets out to the source of the returning packets.
How is this done?
Since the NAT router links the internal private network to the Internet, it sees everything sent out to the Internet by the computers on the LAN. It memorizes each outgoing packet's destination IP and port number in an internal "connections" table and assigns the packet its own IP and one of its own ports for accepting the return traffic. Finally, it records this information, along with the IP address of the internal machine on the LAN that sent the outgoing packet, in a "current connections" table.

When any incoming packets arrive at the router from the Internet, the router scans its "current connections" table to see whether this data is expected by looking for the remote IP and port number in the current connections table. If a match is found, the table entry also tells the router which computer in the private LAN is expecting to receive the incoming traffic from that remote address. So the router re-addresses (translates) the packet to that internal machine and sends it into the LAN.
And here's the really good part:
If the arriving packet does not exactly match traffic that is currently expected by the router, the router figures that it's just unwanted "Internet noise" and discards the unsolicited packet of data.

With a NAT router protecting your connection to the Internet — even if you only have one computer on the LAN behind the router — none of the Internet scanning and worms and hackers and other annoying and malicious Internet nonsense can get to your computer or computers.
If the NAT router isn't already expecting the incoming data, because one of the machines on the LAN asked for it from the Internet, the router silently discards it and your private network is never bothered.
So now that we have the basics . . .

Let's get a bit more advanced
Since NAT routers allow data to pass readily from the internal secure LAN out to the external insecure Internet WAN, but will automatically BLOCK unsolicited inbound data from the WAN, a NAT router can be thought of as a sort of one-way valve:
When designing your own Internet "plumbing" it's
useful to think of a NAT router as a one-way valve.

Packets of data can freely flow from the secure LAN out to the insecure
WAN, but "unsolicited" traffic attempting to flow in from the insecure
WAN to the secure LAN is automatically blocked from entering.

Also, a multi-port NAT router is two components in one box:

As you can see from the block diagram above, internally a NAT router is a standard network switch interconnecting the machines plugged into the router to the router's network address translation WAN interface. What's significant for our discussion is that all of the internal machines are interconnected on the same LAN. This is convenient for sharing files and data among the machines, but it creates a security problem if all of the machines are not equally secure and trustworthy. If any malware or Trojan software were to somehow get onto any one of the machines, and that machine is on the LAN with all of the others (as it normally is), the malicious software would have access to every other uninfected machine sharing the once-secure LAN. By sending "ARP broadcasts" to the LAN, an infected machine can determine the IP and "MAC" addresses of every other machine on the LAN . . . and go to work on them.
Malicious hackers know all about this LAN-side vulnerability. This is why many recent viruses and worms attempt to spread not only by scanning the Internet for additional vulnerable targets, but they also attempt to spread locally through Windows file sharing, RPC vulnerabilities, and many other well-known Windows insecurities. Once one machine gets hit, every machine on the LAN can fall victim.
What can be done to improve LAN security with multiple machines?
Here's where thinking about NAT routers as one-way valves comes in. A second NAT router can be used on the internal LAN to create a second, even MORE SECURE LAN:

Yes, this works! NAT routers can be cascaded "IN SERIES" and used as one-way security flow valves. Looking at the diagram above:  Machines on the "Semi-Secure" (middle) LAN can access the Internet, but they are protected by the "External NAT" from most Internet badness.
 Machines on the "Super-Secure" internal LAN can also access the Internet, first by going out through the "Internal NAT" and then the "External NAT". As with machines on the Semi-Secure LAN, the "External NAT" will keep unsolicited traffic from entering the network.
 Because the Semi-Secure LAN is on the OUTSIDE (WAN side) of the Internal NAT, the machines on the Semi-Secure LAN are unable to freely access the machines behind the Internal NAT.
 The machines behind the Internal NAT can access the machines in the middle, but NOT the other way around!
Where would TWO NAT routers be useful?

   Completely isolating a router's DMZ network and servers.

   Isolating an open or low-security wireless access point.

   Protecting one "high-value" machine from the rest of the network.

Our Multi-NAT Router Networks configuration details page contains extensive detailed background information on NAT router operation and configuration within multi-NAT router networks.
Let's look at each application in turn:

Completely isolating a router's DMZ network and servers:
Our previous discussion of NAT routers stated that incoming packets which have not been explicitly solicited by machines on the router's LAN side are discarded. The router's default "discard all unsolicited packets" configuration can be altered for more advanced applications:

 Port Forwarding can be enabled to configure routers to forward unsolicited packets arriving at specified router ports to specified machines within the router's LAN network. This can be useful when using some instant messaging, VoIP, or peer-to-peer systems that are otherwise unable to penetrate the firewall that NAT routers inherently create.

 A Routing DMZ machine can also be specified, separately or additionally, to receive any and all unsolicited traffic that is not otherwise being returned to other machines on the router's LAN network. This puts the specified machine "out on the front line" of the Internet to receive anything that might be aimed at the router's public IP. ("DMZ" stands for "De-Militarized Zone")

As you might imagine, a router's "DMZ" machine, and even a "port forwarded" machine needs to have substantial security or it will be crawling with Internet fungus in no time. That's a BIG problem from a security standpoint. Why?

As the NAT router block diagram above shows, a NAT router has a standard Ethernet switch interconnecting ALL of its LAN-side ports. There's nothing "separate" about the port hosting the special "DMZ" machine. It's on the internal LAN! This means that anything that might crawl into it through a forwarded router port, or due to its being the DMZ host, has access to every other machine on the internal private LAN. (That's really bad.) What can be done to create a super-secure internal LAN, while still allowing the flexibility of having one or more security-challenged DMZ or port-forwarded machines? Just use a secondary NAT router:

Remember that NAT routers are like one-way flow valves for data:

Data can flow freely OUT through the router from the LAN to the WAN, but unsolicited data is blocked from flowing back IN from the WAN to the LAN. Since there is nothing to prevent TWO NAT routers from being "chained" and connected in series, the security-challenged machine can be completely isolated from the internal network by sandwiching it in between the two chained routers. It's behind the external router and in front of the internal router. Since it's in front of the internal router, its traffic can not flow into the internal LAN, but it can still reach the Internet (through the external router)  . . . and the users on the internal LAN can reach it since it's outside the internal LAN. Now let's look at the second typical application:

Isolating an open or low-security wireless access point:
Suppose you have a first-generation wireless Wi-Fi NAT router access point running either fully-open (you never bothered to setup any security at all) or with crackable WEP encryption (because your hardware cannot be upgraded to the later generation of really good WPA encryption).

Since the wireless access point radio is simply on the external router's LAN switch, ANYONE who has, or gains, access to your wireless network is also on the rest of your LAN and can directly access any of your other machines. You can leave your old and not-so-secure WEP Wi-Fi access point right where it is by adding a second NAT router to protect your LAN from any dangers created by the wireless router:

Our final application example:

Protecting one "high-value" machine from the rest of the network:
Suppose that rather than protecting all of your network from one "external danger" — like a machine on a DMZ or a Wi-Fi access point — you want to protect one "high-value" machine from potential insecurity within the rest of your own network.

For example, suppose that each of your teenage kids has their own computer connected to your shared "family" LAN created by a single NAT router. Or you might be the boss in a small office, where everyone in the office is sharing a single NAT router. In either case, you might not like the idea, for whatever reason, of having your (dad or boss) computer on the same LAN network as everyone else. If your kids or employees were to get themselves infected, download or bring something really nasty home from school, it could quickly spread to all "peer" machines connected to the same LAN network.
So in this case the main LAN, as opposed to a single high-risk machine, is the "scary zone" and you want to protect your single "high-value" machine from anything that might be going on out on that network. So this time you give your single machine its own "one-way security valve" NAT router. The router participates on the LAN with the other high-risk "scary" computers while preventing anything out there from crawling into your machine:

As we have seen, NAT routers make valuable network security devices and offer much more flexibility than just being used to interface a local network to the Internet. They can also be used as "one-way security valves" to create layers of protected sub-networks.

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