Advantages of Dynamic IP and Static IP

One of the techie words that you would often come across when you sign up for your home broadband package or business package is IP address or Internet Protocol address. When you get a broadband connection, you are normally offered an IP address so that other PCs in the world wide web network can connect and communicate with your PC (if you are a home user) or your web server (assuming, you are hosting a website on your web space).

Non-technically speaking, IP address is a unique number often assigned to your PC in a network. If you are connected to internet, just check the internet options to go to LAN settings. You would find the IP address of your PC. This address helps other PCs to identify your PC as well as helping your PC to get information from other PCs which have similar unique numbers.

IP addresses are of two types: Dynamic IP and Static IP. What are their features? Why do you get dynamic IP free, why does getting a static IP cost you a bit? What are the advantages and disadvantages of each type?

Remember, when your PC is not connected to internet, it can have any type of IP which is offered by the administrator. Usually, in a LAN network, the IP address of individual PC will be unique and that is the only required in such a network unless the PC is connected to internet.

Dynamic IP

Dynamic IP is usually offered free by all ISPs and this IP will change every time you log on to internet. This means your PC will be assigned different number codes at different times.

Advantages of Dynamic IP

In a network that is administered by Dynamic Host Configuration Protocol (DHCP), the allocation of IP address and network configuration are done much faster.

All the computers (clients) get IP address, DNS, gateway from the DHCP server, automatically. This also makes your task of adding new computers to the network much easier. Regardless of the size of the network, dynamic IP is quite useful as it is easy to allocate, distribute and manage.

In a large LAN network, dynamic IP administration helps you to save your time as you need not configure hundreds of computers manually.

Dynamic IP also helps you to log in as an anonymous user.

The main disadvantage of dynamic IP is that it is not suited to web hosting. You would require static IP then. However, home users will not find any difficulty in using this type of IP.

Static IP

A few broadband providers offer this option which has some distinct advantages. It is a useful feature when you consider web hosting as the server often needs this type of IP address as the DNS will be able to interpret the domain names as IP addresses which never change in the network. Static IP is quite helpful to identify a specific PC in a large network of PCs. Hence, static IP is often used in a large infrastructure environment.

Advantages of Static IP

As static IP never changes in the internet environment, a specific PC can be accessed and controlled and maintained from any place.

For web hosting purposes,static IP is very ideal. If you are a business user and want to promote your business via internet, go for a business broadband package which sometimes may provide you with a free static IP address. Businesses can see better growth and be in touch with their customers when they have their own websites. If you are looking for a cheaper option, find a business package that comes with free static IP and free web space.

Make sure that you pick the right business broadband package after going through the extras provided by the ISPs like free emails, free domain name, webspace etc.

Just think that you can create your own email addresses with your domain name. If your email accounts have some unique identity, they make a huge difference and become an important part of better management of your businesses, it is better to have your own email accounts with your own domain name. It will also help your company to cut a niche among your competitors.

If you are a gamer and use a dedicated broadband connection for that purpose, take a static IP and find the difference. It would definitely help you to have an significant edge over others. This is because the FTP servers make the data transfer much faster.

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CCNA Certification Training: Configuring Static Routes On A Cisco Router

The great thing about CCNA certification training is that the skills you learn will truly come in handy when working with Cisco routers and switches in production networks. That's particularly true of static route configuration. While most networks use dynamic routing protocols such as RIP, EIGRP, and OSPF to build routing tables, static routes still come in handy sometimes - especially if a routing protocol configuration goes awry.

Let's say that you just added a new segment to your network and you've successfully added it to your network's routing tables. Suddenly, on Monday morning, users on that segment can't get to a network resource such as an email server, or they can't get out to the Internet. We all know what it's like to try to fix something while the phone's ringing like crazy. That's when we have to do two things...

1. Resist the temptation to tell the caller "I would fix it, but I'm too busy talking to you"

2. Apply some kind of "quick fix" that will give you time to investigate the problem

Static routes are a great quick fix. You can use a static route to get the users where they need to be, which gives you time to find out what the problem is with the dynamic routing protocol. (You must also resist the temptation to apply a static route and declare the problem fixed!)

Static routes are configured with the ip route command, followed by the destination network and mask. After that, you must specify either the next-hop IP address or the local exit interface. Both of the following masks are acceptable:

ip route 172.10.1.0 255.255.255.0 210.1.1.1

ip route 172.10.1.0 255.255.255.0 serial0

Using IOS Help on a Cisco router shows the various options:

R1(config)#ip route ?

A.B.C.D Destination prefix

profile Enable IP routing table profile

vrf Configure static route for a VPN Routing/Forwarding instance

R1(config)#ip route 172.10.1.0 ?

A.B.C.D Destination prefix mask

R1(config)#ip route 172.10.1.0 255.255.255.0 ?

A.B.C.D Forwarding router's address

BRI ISDN Basic Rate Interface

Dialer Dialer interface

Loopback Loopback interface

Null Null interface

Serial Serial

TokenRing IEEE 802.5

Remember, you're specifying either the next-hop router's IP address or the local router's exit interface!

Configuring static routes is a great skill to have in the network room and in the CCNA exam room. Be ready to configure them in either situation!

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CCNA Certification Training: Configuring static routes on a Cisco router

The great thing about CCNA certification training, the skills you learn really useful in working with Cisco routers and switches in production networks. This is mainly for configuring static route. While most networks use dynamic routing protocols like RIP, EIGRP, and OSPF to build routing tables, static routes still come in handy sometimes - especially if a routing protocol configuration goes awry.

Suppose you have just added a newNetwork segment and you've successfully added the network routing tables. Suddenly, on Monday morning, users of this segment did not get to a network resource, such as a mail server, or can not get out to the Internet. We all know how to solve groped for something while the phone is ringing like crazy. This is when we have to do two things ...

1. Resist the temptation to say, the caller: "I would fix it, but I'm too busy to talk to you"

2. Apply a sort of"Quick Fix" that gives you time to examine the problem

Static routes are a very quick way. You can create a static route to the user, where they must be the time to find out what the problem is with the dynamic routing protocol to get. (You must also resist the temptation to apply a static route and declare the problem solved!)

static routes are configured with the command ip route through the destination network and mask below. Then, you must eitherthe next hop IP address or the local exit interface. These two forms are allowed:

ip route 172.10.1.0 255.255.255.0 210.1.1.1

ip route 172.10.1.0 255.255.255.0 Serial0

Help with IOS on a Cisco router shows the different possibilities:

R1 (config) # ip route?

ABCD Destination prefix

Profile to activate the IP routing table profile

Configuring VRF static route for example, VPN forwarding / routing

R1 (config) # ip route 172.10.1.0?

ABCD Destination prefix mask

R1 (config) # ip route 172.10.1.0 255.255.255.0?

ABCD Forwarding router's address

BRI ISDN Basic Rate Interface

Dialer Dialer interface

Loopback Loopback interface

He knew Interface

Serial

Token Ring IEEE 802.5

I remind you that you are or IP address of the router next hop or output interface of the local router!

Configure static routes is a great ability toin the area of networking and CCNA exam room. Be prepared to configure it either way!

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PPTP and HTTP Port Forwarding with Static NAT on a Cisco router

Recently a student asked one of our seminars on port forwarding on a router. Its purpose was to connect clients to a server outside the internal PPTP VPN on this. This article will explain how to come together with a brief look at the static NAT for packets to be transmitted to a web server.

Port forwarding on a Cisco router

Sometimes we have internal resources that should be accessible from the Internet, such as web servers, mail servers or VPN servers.recommending isolate Typically these resources in a DMZ to the LAN of the office for protection from evil, but regardless of how you choose to create, the process of packet forwarding, the router interface belongs requested outside of an internal host . It 's really a fairly simple process. Here is the configuration of a Cisco 2611:

Interface Ethernet0 / 1

IP address 12.1.2.3 255.255.255.0

ip nat outside

!

Interface Ethernet0 / 0

IP Address192.168.101.1 255.255.255.0

IP NAT inside

!

ip nat inside source interface Ethernet0 list 101 / 1 overload

ip nat inside source static TCP 192.168.101.2 1723 interface Ethernet0 / 1 1723

!

access-list 101 permit ip any any

In the above configuration is Ethernet 0 / 1 over the internet with a static address of 12.1.2.3 and Ethernet 0 / 0 is connected to the internal network with a static address 192.168.101.1. Outside NAT configured on E0 / 1inside and NAT is configured on E0 / 0. Access-list 101 works in collaboration with the "IP NAT inside source interface Ethernet0 list 101 / 1 overload" statement to permit hosts E0 / 1 to use to access Internet Sharing, which has assigned IP address Ethernet E0 / 1 interface. connect

The statement "overload" implements PAT (Port Address Translation) which makes it possible. (PAT allows multiple internal hosts to a single address on an external interface by adding different partsThe port numbers for each connection.)

The "ip nat inside source static TCP 192.168.101.2 1723 interface Ethernet0 / 1 1723" statement takes the incoming port 1723 (PPTP) requests on Ethernet0 / 1 and forwards it to the VPN server is 192.168.101.2.

It could be something similar with a Web server using port 1723 to port 80 or to the 443rd's what it would look like this:

Interface Ethernet0 / 1

IP address 12.1.2.3 255.255.255.0

ip natoutside

!

Interface Ethernet0 / 0

IP address 192.168.101.1 255.255.255.0

IP NAT inside

!

ip nat inside source interface Ethernet0 list 101 / 1 overload

ip nat inside source static TCP 192.168.101.2 interface Ethernet0 80 / 1 80

!

access-list 101 permit ip any any

In this example, the Web server are on 192.168.101.2 and instead of forwarding PPTP (port 1723) traffic, we redirect HTTP (port 80) traffic.

Of course, you canCisco router configuration in a similar way forward to accommodate almost any type of traffic from an external interface to an internal one.

Copyright (c) 2008 Don R. Crawley

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PPTP and HTTP Port Forwarding with Static NAT on a Cisco router

Recently a student asked one of our seminars on the port forwarding on a router. She wanted to PPTP clients from outside to a VPN server on the get in touch. In this article I will explain how to do it together with a brief look at using static NAT traffic to a web server.

Port Forwarding on a Cisco router

Sometimes we have the internal resources that it be Internet access, such as Web servers, mail servers or VPN servers.In general, I recommend isolating those resources in a DMZ to protect your corporate network from the bad, but regardless of how you choose your design, the process goes forward packages you want from the outside interface of the router to an internal host. It's really quite simple. Here is the configuration on a Cisco 2611 router:

interface Ethernet0 / 1

IP address 12.1.2.3 255.255.255.0

ip nat outside

!

Interface Ethernet0 / 0

IP Address192.168.101.1 255.255.255.0

ip nat inside

!

ip nat inside source list 101 interface Ethernet0 / 1 overload

ip nat inside source static tcp 192.168.101.2 1723-interface Ethernet0 / 1 1723

!

access-list 101 permit ip any any

In the above configuration is Ethernet 0 / 1, is connected to the public Internet with a static address of 12.1.2.3 and Ethernet 0 / 0, connected within the network with a static address 192.168.101.1. NAT is outsideconfigured E0 / 1 and NAT inside is configured on E0 / 0 Access-list 101 works in conjunction with the "ip nat inside source list 101 Ethernet0 / 1 overload" statement to allow to use all the hosts within the E0 / 1 interface to the common use of the Internet, which is assigned the IP address of Ethernet -connect interface to connect to E0 / 1.

The "overload" statement implements PAT (Port Address Translation) which makes this possible. (PAT allows multiple internal hosts to single address on an external interface of sharesAnnexes different port numbers for each port.)

The statement "ip nat inside source static tcp 192.168.101.2 1723-interface Ethernet0 / 1 1723" takes incoming port 1723 (PPTP) requests on Ethernet0 / 1 and forwards them to the VPN server is 192.168.101.2.

You could do something similar with a Web server by using port 1723 443. on port 80 or port Here's what would look like:

interface Ethernet0 / 1

IP address 12.1.2.3 255.255.255.0

ipnat outside

!

Interface Ethernet0 / 0

IP address 192.168.101.1 255.255.255.0

ip nat inside

!

ip nat inside source list 101 interface Ethernet0 / 1 overload

ip nat inside source static tcp 192.168.101.2 80 interface Ethernet0 / 1 80

!

access-list 101 permit ip any any

In this example, the Web server is located at 192.168.101.2 and instead of forwarding PPTP (port 1723) traffic, we will forward HTTP (port 80)Traffic.

Of course, you can configure your Cisco router in a similar manner so that almost any type of traffic from an external interface helps us to an internal host.

Copyright (c) 2008 Don R. Crawley

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