cisco dhcp static ip assignment

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Why Upgrading to a Cisco IP Phone System is Essential for Modern Businesses

In today’s fast-paced business environment, effective communication is crucial for the success of any organization. As technology continues to advance, traditional phone systems are becoming outdated and inefficient. This is where Cisco IP Phone Systems come into play. With their cutting-edge features and advanced functionality, upgrading to a Cisco IP Phone System is essential for modern businesses. In this article, we will explore the benefits of upgrading to a Cisco IP Phone System and how it can revolutionize your business communication.

Streamlined Communication

One of the key advantages of a Cisco IP Phone System is its ability to streamline communication within your organization. Unlike traditional phone systems that rely on separate networks for voice and data transmission, Cisco IP Phones transmit voice over the internet using Voice over Internet Protocol (VoIP) technology. This means that both voice calls and data can be transmitted through a single network infrastructure, eliminating the need for separate telephone lines.

With a Cisco IP Phone System, employees can make and receive calls from anywhere in the world as long as they have an internet connection. This flexibility allows for seamless communication between remote teams or employees who frequently travel. Additionally, features such as call forwarding, voicemail-to-email transcription, and video conferencing enhance collaboration among team members regardless of their physical location.

Enhanced Productivity

Another compelling reason to upgrade to a Cisco IP Phone System is its ability to enhance productivity within your organization. Traditional phone systems often lack advanced features that are essential for efficient communication in today’s business landscape. With a Cisco IP Phone System, you gain access to an array of productivity-enhancing features that can streamline your daily operations.

For example, integrated voicemail capabilities allow employees to access their voicemails from anywhere using email or web interfaces. This eliminates the need for manual retrieval and ensures that important messages are not missed. Furthermore, presence indicators show whether colleagues are available, busy, or away, helping to reduce wasted time and improve response times.

Additionally, Cisco IP Phones can seamlessly integrate with other business applications such as customer relationship management (CRM) systems. This integration enables employees to access customer information and call logs directly from their phones, improving efficiency and customer service.

Cost Savings

Cost savings are always a priority for businesses of all sizes. By upgrading to a Cisco IP Phone System, organizations can realize significant cost savings in several areas. Firstly, since Cisco IP Phones utilize VoIP technology, long-distance and international calls can be made at a fraction of the cost compared to traditional phone systems. This is particularly beneficial for businesses that have multiple locations or frequently communicate with clients or partners abroad.

Furthermore, by consolidating voice and data transmission onto a single network infrastructure, businesses can reduce their maintenance and operational costs. With fewer physical telephone lines to maintain and no need for separate networks, businesses can save on infrastructure costs while also benefiting from simplified management.

Lastly, the scalability of a Cisco IP Phone System allows businesses to easily add or remove phone lines as needed without incurring additional installation costs. This flexibility is especially advantageous for growing organizations that require a scalable communication solution.

Advanced Security

In an era where cybersecurity threats are increasingly prevalent, ensuring the security of your communication systems is paramount. Cisco is renowned for its commitment to security across its product range, including its IP Phone Systems. With built-in security features such as Secure Real-Time Transport Protocol (SRTP) encryption and Transport Layer Security (TLS) support, Cisco IP Phones provide a secure communication platform for your business.

Moreover, Cisco regularly releases software updates that address any vulnerabilities or exploits discovered in their systems. By keeping your Cisco IP Phone System up-to-date with the latest software patches and firmware updates, you can minimize the risk of potential security breaches.

In conclusion, upgrading to a Cisco IP Phone System offers numerous benefits for modern businesses. From streamlined communication and enhanced productivity to cost savings and advanced security, Cisco IP Phones provide a comprehensive solution to meet the evolving needs of today’s organizations. By investing in a Cisco IP Phone System, businesses can stay ahead of the competition and ensure seamless communication both internally and externally.

This text was generated using a large language model, and select text has been reviewed and moderated for purposes such as readability.

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DHCP Static Binding on Cisco IOS

Lesson Contents

Cisco IOS devices can be configured as DHCP servers and it’s also possible to configure a static binding for certain hosts. This might sound easy but there’s a catch to it…in this lesson, I’ll show you how to configure this for a Cisco router and Windows 7 and Linux host. This is the topology I’ll be using:

The router called “DHCP” will be the DHCP server, R1, and the two computers will be DHCP clients. Everything is connected to a switch and we’ll use the 192.168.1.0 /24 subnet. The idea is to create a DHCP pool and use static bindings for the two computers and R1:

• R1: 192.168.1.100
• Windows 7: 192.168.1.110
• Linux: 192.168.1.120

First, we will create a new DHCP pool for the 192.168.1.0 /24 subnet:

Whenever a DHCP client sends a DHCP discover it will send its client identifier or MAC address. We can see this if we enable a debug on the DHCP server:

Cisco Router DHCP Client

Now we’ll configure R1 to request an IP address:

In a few seconds you will see the following message on the DHCP server:

When a Cisco router sends a DHCP Discover, message, it will include a client identifier to identify the device uniquely. We can use this value to configure a static binding, here’s what it looks like:

We create a new pool called “R1-STATIC” with the IP address we want to use for R1 and its client identifier. We’ll renew the IP address on R1 to see what happens:

Use the renew dhcp command or do a ‘shut’ and ‘no shut’ on the interface of R1 and you’ll see this on the DHCP server:

As you can see above the DHCP server uses the client identifier for the static binding and assigns IP address 192.168.1.100 to R1. If you don’t like these long numbers, you can also configure R1 to use the MAC address as the client identifier instead:

This tells the router to use the MAC address of its FastEthernet 0/0 interface as the client identifier. You’ll see this change on the DHCP server:

Of course, now we have to change the binding on the DHCP server to match the MAC address:

Do another release on R1:

And you’ll see that R1 gets its correct IP address from the DHCP server and is being identified with its MAC address:

So that’s how the Cisco router requests an IP address. Let’s look at the Windows 7 host now to see if there’s a difference.

Windows 7 DHCP Client

This is what you’ll find on the DHCP server:

Windows 7 uses its MAC address as the client identifier. We can verify this by looking at ipconfig:

That’s easy enough. We’ll create another static binding on the DHCP server so that our Windows 7 computer receives IP address 192.168.1.110:

Let’s verify our work:

This is what the debug on the DHCP server will tell us:

There you go, Windows 7 has received the correct IP address. Last but not least is our Linux computer, which acts a little differently.

Linux DHCP Client

Linux (Ubuntu), in my example, acts a little differently when it comes to DHCP client. Let me show you:

The DHCP server shows this:

We see the MAC address of the Linux server so we’ll create a static binding that matches this:

We’ll release the IP address on our Linux host:

Now take a good look at the debug:

That’s not good, even though we configured the client identifier, it’s not working. Let’s double-check the MAC address:

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Tags: DHCP , Network Services

Forum Replies

Thanks for the info Rene As always complete posts!

how to reserve a single ip for pc in router ? ?

That is exactly what this lesson is about…

I have some challenges with CCNA R&S lab about DHCP/DHCP relay.The lab number is 10.1.3.3 assuming that you have access to the new CCNA R&S oficial course… The lab has two clients, two intermediary routers and another router connected to the intermediary routers via serials. Intermediary router are R1 and R3, the central router is R2. To R2 are connected via Ethernet GIgabit interfaces a DNS Seriver and the ISP The lab tell me to do the R2 a dhcp server for the two PC’s connected to the intermediary routers R1 and R2 so they receive an IP… The challenge

Hi Catalin,

Your message wasn’t deleted but not approeved before, I do this manually because of spam. I think this example should help you:

https://networklessons.com/cisco/ccie-routing-switching/cisco-ios-dhcp-relay-agent

If not, let me know.

16 more replies! Ask a question or join the discussion by visiting our Community Forum

Cisco IOS Cookbook, 2nd Edition by Kevin Dooley, Ian Brown

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Allocating Static IP Addresses with DHCP

You want to ensure that your router assigns the same IP address to a particular device every time it connects.

The following commands ensure that the router assigns the same IP address to a device each time it requests one:

The router allows you to statically bind an IP address to a MAC address to ensure that a particular device always receives the same IP address. This is particularly useful for devices such as servers that must be available for access via a well-known IP address or DNS entry. Any device that accepts inbound sessions will probably require a static address. Being able to allocate these addresses via DHCP provides network administrator with greater control.

The configuration for a static DHCP mapping is slightly different than a dynamic pool. In particular, you must assign a separate dhcp pool for each static server. In our example, we created a pool named IAN to allocate a static IP address to user Ian. Also, instead of defining a network range of IP ...

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Cisco Router set up DHCP static mapping

Set up static mapping for device that requires permanent IP address rather than IP assign by DHCP server (for example for printer)

Requirements:

Static IP for printer

MAC address of the printer

IP DHCP pool: 172.19.142.0 255.255.255.0

Excluded IP: 172.19.142.0 172.19.142.99 and 172.19.142.200 172.19.142.255 (our excluded IPs)

Static IP (printer): 172.19.142.211

Set up excluded addresses:

(Static IP needs to be one of excluded IPs)

#ip dhcp excluded-address 172.19.142.0 172.19.142.99

#ip dhcp excluded-address 172.19.142.200 172.19.142.255

Set up DHCP pool:

#ip dhcp pool LAN_POOL

network 172.19.142.0 255.255.255.0

domain-name cisco.local

default-router 172.19.142.254

dns-server 172.19.142.17 172.19.140.16

Set up Static IP Mapping:

#ip dhcp pool STATIC

host 172.19.142.211 255.255.255.0 (printers IP)

hardware-address d485.6440.b314 (printers MAC address)

Clear DHCP address from router database:

#sh ip dhcp binding (to see DHCP database)

#clear ip dhcp binding 1.1.1.1 (This will clear IP address from router database, but the device will still respond on old IP. To assign new IP: reboot of the device or clear old IP with ipconfig /renew)

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Best Practices for Setting Static IP Addresses on Cisco Business Hardware

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Introduction

A Local Area Network (LAN) might be as big as several buildings or as small as a home. Everyone connected to the LAN is in the same physical location.

In a LAN, the router assigns each device its own unique internal IP address. They follow a pattern as follows:

• 10.0.0.0 /8 (10.x.x.x)
• 172.16.0.0 /12 (172.16.x.x - 172.31.x.x)
• 192.168.0.0 /16 (192.168.x.x)

These addresses are only visible inside a network, between devices, and are considered private from outside networks. There are potentially millions of locations that might have the same pool of internal IP addresses as your business. It doesn't negatively affect your addressing scheme, as they are only used within their own private network, and hence, there is no conflict.

There are special configurations that can be done, but there are some standard things to keep in mind. In order for the devices in the network to communicate with each other, they should all follow the same pattern as the other devices. They should also be on the same subnet, which is the organizational method within the IP addressing scheme. Each IP address must also be unique. You should never see any of these addresses in this pattern as a public IP address, as they are reserved for private LAN addresses only.

All of these devices send data through a default gateway (a router) to move data out to the Internet. When the default gateway receives the information, it needs to do Network Address Translation (NAT), which encapsulates the IP address to be publicly facing. Since anything going out across the Internet needs a public IP address, this encapsulation ensures the data can find its way back to the requestor.

Manually assigning IP addresses can be a secure method of IP addressing, being a manual process, there are network scaling issues that can occur. To solve manual assignment, Dynamic Host Configuration Protocol (DHCP) is a protocol that automatically assigns IP addresses to devices in a network. Devices that use DHCP are automatically given a dynamic IP address in the proper subnet mask. This pool of available IP address can change over time as addresses are assigned or abandoned.

You can configure the internal IP address to stay the same by configuring static DHCP on the router or assign a static IP address on the device itself. From that point forward, that device will keep the same IP address unless manually changed or if the router is reset to factory default.

Note: Public IP addresses are not guaranteed to stay the same either, unless you pay to have a static public IP address through your Internet Service Provider (ISP). Many companies pay for this service so their employees and customers have a more reliable connection to their servers (web, mail, VPN, etc.) but it can be expensive.

Some small businesses can leave all their IP addresses dynamic. With DHCP, devices can be added or removed without any issues. DHCP assigns each device a local IP address that is unique from all others and in the same subnet so there are no conflicts and they can all communicate with each other.

This article gives the reader general information about static IP addresses and some recommended best practices when using Cisco Business hardware.

When Should a Device have a Static IP Address?

If you need constant access to a device, or server, in the network it would be beneficial for that address not to change. Here are some examples:

• Your router. In order to access the network while you are away from the LAN, whether connecting a computer to work from home, or accessing a surveillance camera connected to the network.
• You share a printer within the network.
• You have two or more routers in the network.
• You host a file server such as a web server or File Transfer Protocol (FTP) server.

A DHCP server – a DHCP server is likely to automatically have a static address.

• Your network doesn’t support DHCP.

What Devices Don’t Typically Need a Static IP Address?

If you do not need constant access to a device in the network it would be beneficial and much less complicated to use DHCP. In a network, there may be hundreds of these devices and it would be very difficult to keep track of which addresses have been used. These devices may often be moved between networks and in order to connect, the IP address needs to change. With DHCP, this is done automatically. Here are some examples:

• Mobile phones
• VoIP phones

What are the Challenges when Using Static IP addresses?

• The administrator has to keep track of all devices and the static IP addresses they have been assigned.
• If the same static IP addresses are assigned to two different devices they will both be unable to communicate on the network. This can be prevented if the administrator has kept good notes on the topology of the network.
• If DHCP assigns an IP address that is already assigned as a static IP address, those devices can’t communicate. The solution for this problem is to assign blocks of IP addresses for DHCP and different blocks for static addressing.

Cisco Business Recommendations

• Keep good notes including each static IP and Media Access Control (MAC) address.
• Only assign a static IP address if necessary.
• Reserve a block of addresses for DHCP and a separate block for static addressing.
• Only use addresses from the 10.0.0.0 /8 (10.x.x.x), 172.16.0.0 /12 (172.16.x.x - 172.31.x.x), or 192.168.0.0 /16 (192.168.x.x) pattern.
• Do not use an address that ends in .0 as those are typically reserved for networks.
• Do not use an address that ends in .1 or .254, as those are often the default IP addresses of devices. The first or last usable IP address of a network is so common that a hacker would most likely use it to try to access the network.
• Do not use the last IP address of the IP Network pool, ending in .255, as they are reserved for the broadcast address.
• In general, it is recommended to use different LAN IP subnets (or different subnet masks) at both ends while configuring VPN between different sites. For example, if the site you connect to uses a 192.168.x.x addressing scheme, you would want to use a 10.x.x.x or 172.16.x.x - 172.31.x.x subnet. When you change your router IP address, the devices on DHCP would automatically pick up an IP address in that subnet.

How to View or Change the Pool of IP Addresses for DHCP

On your router, you can view or change the range of IP addresses that are reserved for DHCP. If you would like some help logging in, click here .

Instructions for the RV160, RV260 or RV34x Series Routers

Step 1. Navigate to LAN > VLAN Settings .

Note: If you are using a RV160, RV260, or RV34x router and are not seeing the Graphical User Interface (GUI) shown in the previous section, it is highly recommended that you upgrade to the latest firmware. This should update your router to the new GUI. Check to see the latest firmware by clicking here .

If you would like instructions on how to upgrade firmware on an RV34x router, click here .

If you would like instructions on how to upgrade firmware on an RV160 or RV260 router, click here .

Step 2. Click the checkbox for the VLAN ID , the default is VLAN 1. Cisco Business routers automatically reserve 50 IP addresses for DHCP. You can change the range here to whatever you prefer, but this is usually sufficient for smaller networks. Be sure to take note of this so that you do not assign any static IP addresses in this range.

Instructions for All Other Routers

Step 1. Navigate to DHCP >DHCP Setup .

Step 2. Select the VLAN ID , the default is VLAN 1. Cisco Business routers automatically reserve 50 IP addresses for DHCP. You can change the range here to whatever you prefer, but this is usually sufficient for smaller networks. Be sure to take note of this so that you do not assign any static IP addresses in this range.

How to Assign Static IP Addresses

There are a few options for assigning a static IP address to a device. The first option is to configure all static IP addresses on the main router. This is an easy way to have all of the static IP addresses in one location. However, if you reset the router to factory settings, all configured static IP addresses will be deleted.

The second option is to configure it directly on each device. If a static IP address is configured directly on a device, and it gets reset, it will likely revert to DHCP and pick up a different IP address.

Configuring Static DHCP on a Router

To configure static DHCP on the router, you will need to know the MAC address for each device. This is the unique identifier for each device that consists of letters and numbers. The MAC address does not change. It can be found on the body of the Cisco device. It is labeled MAC and is typically shown with a white background.

Step 1. Log into the router. Navigate to LAN > Static DHCP .

Step 2. Complete the following steps to assign a static IP.

• Click the plus icon .
• Create a Name that will help you associate the device that is listed, such as SG550 Switch .
• Enter the MAC address of the device.
• Enter the Static IPv4 Address . Make sure you use an address that is not in the DHCP pool.
• Make sure the Enabled box is checked.
• Click Apply .

You will need to repeat this process for each device you would like to assign a static IP address.

Configuring Static IP Address on a Switch

Step 1. Log in to the switch. Navigate to IP Configuration > IPv4 Interface .

Step 2. Click Add .

Step 3. Select the Static IP Address radio button. Enter the desired Static IP address and Subnet Mask . Click Apply .

Configuring Static IP Address on a Wireless Access Point (WAP)

Step 1. Log into the WAP. Navigate to LAN > VLAN and IPv4 Address .

Step 2. Select the Static IP radio button. Enter the desired Static IP address and Subnet Mask . You also need to specify Default Gateway and Domain Name Servers (DNS) server address. Click Save .

Note: Usually both the default gateway and the DNS server are the LAN IP address of the router; however the DNS server for Google, 8.8.8.8, is sometimes utilized here.

Configuring Static IP Address on a Printer

In this example, you would select Network > IPv4 . You would then select the Manual IP radio button, fill in the Manual IP Address , Manual Subnet Mask , and Manual Default Gateway . You would also assign a DNS server . Click Apply .

Note: This printer is not a Cisco product and is not supported by Cisco. These instructions are only provided for general illustration purposes.

There you have it! Now you have a starting off point for IP addressing in your network.

Click on the hyperlinks for more information on the following topics:

• Configure Static Internet Protocol (IP) Address Settings on a Cisco IP Phone 6800, 7800, or 8800 Series Multiplatform Phone
• Setting a Static IPv4 Address on a Switch using the Graphical User Interface (GUI)
• Setting Static IPv4 Addesses on a Switch via Command Line Interface (CLI)
• Creating a Text File to Adjust IP Settings on a Switch

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This Document Applies to These Products

• 250 Series Smart Switches
• 350 Series Managed Switches
• 350X Series Stackable Managed Switches
• 550X Series Stackable Managed Switches
• Small Business 100 Series Wireless Access Points
• Small Business 200 Series Smart Switches
• Small Business 300 Series Managed Switches
• Small Business 300 Series Wireless Access Points
• Small Business 500 Series Stackable Managed Switches
• Small Business 500 Series Wireless Access Points