Posts Tagged ‘ ip address ’

Setting up your IP camera surveillance system using an NVR with Two Ethernet Ports

Written By:
Monday, September 28th, 2015

The technology behind an IP security camera system is constantly evolving and there have been some nice improvements recently. Here at TechPro Security Products, we offer 3 types of systems including ones using IP cameras to provide the video. Although IP cameras may cost a bit more, they are also going to give you the highest resolution available on the market today. This article is going to explain how to set up this type of security camera system using a very useful configuration because some people are a bit intimidated by the networking involved.

There are several different ways that an IP surveillance camera system can be set up. This article is going to go over the type of set up which uses a NVR with two Ethernet ports. This configuration is great because it can be used to avoid putting an unnecessary bandwidth load on a network. All of the IP cameras that we carry give you megapixel quality video. The data involved in transmitting the video from even a one megapixel camera is fairly significant. If you are working with several of these cameras or ones that provide higher resolution (we now carry up to 12 megapixel cameras!) then transmitting all of that video will use an immense amount of bandwidth. This will cause the most common network to not function correctly. Not only can it cause the camera system to not work correctly, it will probably mean that nothing else will be able to use that network correctly. The solution to this is using the second Ethernet port to keep the data involved with the video transmission separated from the main network.

For the purposes of this article we’ll go over setting up a 64 channel NVR with 64 cameras using the dual Ethernet port method. This set up will require the following equipment.

64 ch NVR
A 64 channel NVR (Model# NVR-ELHS-64-4K-DH)

simple switch
A simple gigabyte switch (Model# Switch-5G)

A 16 channel POE switch. (Model# POE-16MB2GP)

An IP camera. (Model# IPOD-EL3MPIR50)

The first step in this type of setup is putting together a temporary configuration so that you can initialize each camera (see Diagram 1). You will need to have a computer, a POE switch and the NVR (using Ethernet port 1) all connected to the same router. You will also need to make sure that you have the NVR’s Ethernet port 1 configured to work with your network.

IP camera layout 1
Diagram 1

This layout will allow you to power each of the cameras and then log into them from the computer in order to get them set up to work with your NVR. The main thing you will need to do while logged into the camera will be to enable motion detection and assign the camera a unique IP address for the IP scheme that will be assigned to the NVR’s second Ethernet port. Changing the camera’s IP address is the last thing that you should do because you will not be able to access it from that computer once this change has been made and saved. There may be some other settings in the camera which will help to customize it for the application which you have planned for it. It’s also a good idea to label each camera with the IP address which you have assigned to it.

Once all of the cameras have been initialized, then they are ready to be set up in their final configuration (see Diagram 2). You will need to go to the network page of the NVR and choose “Multi-Address” from the drop down menu, this will allow each ethernet port to be set to a different IP scheme (for example – Ethernet port 1 can be set up to use the scheme and Ethernet port 2 can be set up to use This is a key feature in keeping the network which is handling the video transmission, from the cameras to the NVR, separate from the main network at the location.

IP camera layout 2
Diagram 2

At this point you should have Ethernet port 1 set to match the IP scheme of the main network, which will be used for remote connection. You should also have Ethernet port 2 set to a different IP scheme and all of your cameras set to unique IP address within that scheme (for example – Ethernet port 2 can be set to and each camera would be set to 10.1.1.x, where x is unique to each camera).

The last step is to get each camera assigned to its own channel on the NVR. This is done by assigning the IP address from a camera to the particular channel which you want to associate with that camera’s live video feed and its recorded video footage. This will be accomplished through the ‘Remote’ page of the NVR using one of two different methods depending on the model of camera that you are using (see picture 1).

If the camera is one of our EL models (for example – IPOD-EL3MPIR50) then the NVR will detect it through the ‘Remote’ page of the NVR’s menu system. Clicking on the ‘Device Search’ button will get the NVR to list any network devices which it can detect. Once that you can see that the camera has been detected then all you have to do is put a check mark next to the camera’s IP address and click on the ‘ADD’ button.

If the camera you are using is any other type then you will need to manually add it to the NVR. To do this you will first need to click on the ‘Manual Add’ button. Next, you will need to enter the camera’s IP address, user name, password and the ports that it is using for video transmission.

Picture 1

This type of IP camera system can be customized to suit any sized system. Our sales team can help you get the type of system which best suits your needs. Our tech support team is also available to help you get everything set up and running correctly.


What is a Subnet?

Written By:
Monday, August 3rd, 2015

When configuring IP devices such as IP cameras, NVRs, and DVRs, you need to set up IP addressing so each device can communicate with the other devices. If you don’t understand how IP addressing works, this can be a frustrating experience.

“Are You on the Same Subnet?”

You may keep hearing this question when you call a Tech Support representative. If you don’t understand what that is and why it’s important, then you have come to the correct place. A subnet refers to the IP address range that a computer ‘lives on’. Every device that is connected to a network has a unique address on that network. That device can only connect to another device that is in the same subnet or address range. To be able to see any other range of IP addresses, you must connect through a router or similar device that is performing NAT (Network Address Translation). A NAT device allows you to view other subnets, like Internet Addresses.

So, What is a Subnet?

A subnet is determined by your ‘Network ID’. Your Network ID is determined by a couple of factors:

1. Your router. Your router settings will determine the initial Network ID when you set up it’s LAN address (Local Area Network).

2. Your ‘Subnet Mask’ determines what range of addresses in your subnet your computer can see and communicate with.

Lets look at an IP address and break it down –

An IP V4 address consists of a group of 4 sets of numbers separated by a ‘dot’ or period. example =

Each number is limited to an integer between 1 and 255 – you’ll never see an address that contains a number larger than 255. If you do – it’s wrong.

Each ‘set’ of numbers is called an ‘Octet’ (from the Latin and Greek ‘octo’ meaning ‘eight’ – each number is an 8-bit value)

When you connect to a LAN (Local Area Network), the router will assign your computer an IP Address, Subnet Mask, Gateway, and DNS Server(s)

IP Address = the unique address of your computer on the LAN.

Subnet Mask = Determines what segments of your Network ID your computer can communicate with.

Gateway = Usually your router. Your router is the ‘Gateway’ to another network. (The Internet is another network = WAN (Wide Area Network)

DNS (Domain Name Service) Server = This is the engine that translates a DNS name into an IP Address. When you type in, the DNS server translates that name to an IP Address =  (Computers use IP Addresses, not names.) The DNS Server looks at constantly updated tables to convert the name to the actual IP address so you can connect.

Your router usually performs NAT and DNS for you as well as other functions such as DHCP and IP Masquerading.

If you plug into a LAN and you get no IP Address or Gateway, etc. it usually means one of two things:

1. You do not have a good connection. (bad cable, defective port, or other hardware issue)

2. There is no DHCP server on the LAN. (Dynamic Host Control Protocol). A DHCP server automatically assigns an IP Address, Gateway, etc. to a device that gets connected to the LAN and is responsible for keeping all addresses it assigns unique between devices. The DHCP server is usually your router.

So, What Does it Mean to be “On the Same Subnet”?

Let’s say your computer has a LAN address of
Your computer has a standard Subnet Mask of
With that Subnet Mask, your computer can only see a device where the first three Octets match exactly. You could not connect to a computer or device with an address
of because the third Octet is different. Your computer is limited to 254 addresses that it can communicate with. (255 possible, minus your computer = 254)

The only way you can ever connect to another network is if one of those remaining 254 addresses is a Gateway performing NAT. (Network Address Translation).

Here is where the Subnet Mask is important – you can ‘unmask’ more addresses and expand your Network ID range.

With an address of – change your Subnet Mask to

This will ‘unmask’ the third Octet from your computer and open your Network ID to

Now you can see a device with an address of (where x = any number between 1 and 255)

Here is how your Subnet Mask affects your Network ID.

IP =
Network ID = 192.168.1
Mask =
The first three octets must match for communication.

IP =
Network ID = 192.168
Mask =
The first two octets must match for communication.

IP =
Network ID = 192
Mask =
Only the first octet must match for communication.

This last subnet mask allows you to see a lot more devices than the standard mask = 254 x 254 x 254 = over 16 million devices instead of only 254.

What You Should Have Learned Here

Look at the Subnet Mask to determine your Network ID.
The number of times you see ‘255’ is the number of octets that must match in the LAN IP Addresses of your devices.
Those matching numbers are your ‘Network ID’.

This is an over simplification of Subnet Masking. It provides a very basic ‘rule of thumb’ for setting network addresses.
There are other numbers you may see on a subnet mask such as 192, 224, 240, 248, 252.

If you see these other numbers appear in your Subnet Mask, consider them a ‘red flag’.

If and when you see this, STOP what you are doing. I guarantee there will be an IT person on site that you will need to consult. Only an IT person (or Network Administrator) will be using those numbers on a LAN and you have no choice but to involve them in the process. (Unless you are an Information Technology person or Network Administrator and you understand how those other numbers can limit the usable IP addresses available on the LAN)

In short – if you see anything other than ‘255’ in your LAN subnet mask this is a strictly managed network and your chances of casually breezing through your installation have just ended.

Call the on site Network Admin for advice before you do anything else.

There are other ranges of IP Addresses that you may encounter on the LAN. Don’t be afraid! They all work the same way.
A LAN will always use what are called Private or Internal address ranges. These addresses will never be used on the Internet, they are reserved for use on the Internal LAN.


If you look at a DHCP LAN address on your computer and it does not fall within one of the private ranges shown above, there is a problem.

There is one more range of addresses you may see, but they usually indicate a network issue. These are ‘Zero Config’ addresses.

The ‘Zero_conf’ addresses start with Range possible = to

This address range is what you will find on a ‘Windows’ PC that can not connect or cannot find a DHCP server.

You will see it on a Windows PC as an ‘Autoconfiguration Address’. When you see a address, you are probably not connected to a network.

Any other address range is not considered ‘Private’ and can cause complications when you try to connect outside of the LAN. (like to the Internet.)

This is because almost all other IP Addresses can be used publicly as Internet Addresses. Since your router is performing NAT, your computer can ‘see’ that expanded range of addresses.

This presents the issue of IP Address conflicts. (Remember that all devices must have a unique IP address.)
If your LAN IP Address range is not within the boundaries of the private ranges shown above, there is a good chance that an Internet site may have the same address as one of the devices on your LAN. You will try to access a device on your LAN and end up connecting to a porn site in Brazil or something crazy.

So just be sure when you set up a LAN, you stay within those Private Address guidelines.

For more assistance with you network range when setting up your security camera equipment, feel free to give our tech support department a call at 866-573-8878 option 3 or check out our Networking Forum on our website.


What is the difference between an internal and external IP address?

Saturday, October 10th, 2009

When you want to connect to your DVR remotely, you will need to use either the internal or the external IP address. This will be determined by whether you are accessing the DVR from inside the network or from outside the network. If you are accessing the DVR from inside your network then you will use the internal IP address. The internal IP address will usually begin with 192.168.XX.XXX . No port number would be used since you are connecting internally. The internal IP address can usually be found in your DVR under network settings.

To access your DVR from outside the network, you will need to use an external IP address followed by the port number to identify the DVR (unless you put the DVR on port 80). An external IP address is the IP address used to connect to your router. The port number will identify the individual device inside the network you wish to access. So an external IP address would not have 192.168 in the beginning but it could be anything else. An external IP address would be entered as XXX.XXX.XXX.XXX:port#