Minggu, 23 Februari 2014

Connecting router with security cameras?




Josh


I just put in a new router at the office and wifi works great but now the 4 Sharx security cameras do not work. They used mulit-view to be over saw when working. anyway how to line the cameras with my router?


Answer
Most security systems have to be configured on the router. I would connect the old router to a PC or laptop via Ethernet and examine it's configuration. Especially, look at the port forwarding and DHCP address reservation sections. Jot down any camera specific settings and transfer the same configurations to the new router.

Here is how it works,

Your security system DVR will have a IP address. It needs to be in the same subnet as your router and you would want to reserve it on your router (DHCP) or set it static on the device so it doesn't change. For example if your router is 192.168.1.1 you could set your DVR to any unused IP from 192.168.1.2 - 192.168.1.254

Your security system will have settings for web port and media port. You really need to look at the manual to see how to set these up. For my Swann system the web port is 85 and the media port is 9000. The web port is used to access your DVR from your local LAN or the Internet using a laptop or PC. The media port is used for mobile phone access.

Both ports must be properly forwarded on your router to the IP of the DVR. For example if your DVR is 192.168.1.2 you would forward the TCP and UDP port 85 to the IP 192.168.1.2.

Then you would access your cameras from your local LAN using the IP followed by a colon and the port number such as http://192.168.1.2:85

To access them from the Internet you will need the WAN address. You use the same process, the WAN IP followed by a colon and the port number.

Let me explain:

A router connects two separate networks and manage the traffic between them.

In most home network applications the router connects your local group of computers and devices known as the LAN with the Internet, commonly called the WAN or Wide Area Network.

The router usually assigns unique Local IP addresses to all of the devices connected to it via a service known as DHCP. The addresses assigned by your router are private addresses http://en.wikipedia.org/wiki/Private_network and are not routable across the Internet.

Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks. Computers that are connected to IP networks must be configured before they can communicate with other computers on the network. DHCP allows a computer to be configured automatically, eliminating the need for intervention by a network administrator. http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol

Your cable or DSL modem will get a Public WAN IP address from your ISP. The modem is connected to the WAN port on your router. The router will manage the traffic between the devices on the LAN and the Internet.

You can see your current public WAN IP here: http://www.mywanip.com/

Depending on your ISP your WAN IP might be dynamic (changing periodically) or static (fixed).

If you have a static WAN IP, you will have no problem. However if you have a dynamic WAN IP your IP will change periodically preventing you from accessing your cameras via the Internet.

If the latter is the case then you'll need a DDNS (Dynamic DNS) service. http://en.wikipedia.org/wiki/Dynamic_DNS

Many security camera manufacturers provide free DDNS service. There are also DDNS companies. http://dyn.com/dns/

This will allow you to always be able to access your cameras even when your public IP changes.

Good Luck...

Cisco Switches - Campus IP Security Cameras Question?




rawr


I am trying to figure out a network design question, which requires me to find some switches and VLAN configurations that fit the below requirements for a campus network. Any guidance would be appreciated.

1.Must support PoE, which prevents the mounting of power bricks or using power injectors;
2.Must segment camera IP traffic from the existing network for security reasons;
3.Must support a minimum of 150 cameras;
4.Must provide physical, as well as logical, redundancy;
5.Must provide sufficient bandwidth for full HD support;
6.Must comply with the Cisco hierarchical design model;
7.Must integrate 1Gb uplinks; and
8.Must minimize rack space.



Answer
Well, first off - PoE requires a power injector to put the power on the Ethernet line.
It saves having to wire an AC outlet AND an ethernet cable.
( you could consider wireless IP cameras.. but then you need AC power to the cameras.)

If you need to support at least 150 cameras - plus networking devices - then you need more than just a single /128 host network. get a full 256 host ( like 10.10.10.1 / 255.255.255.0) net,
or bridge a couple of smaller vlans together.

Sufficient bandwidth for full HD support + minimum 150 camera + 1Gb uplinks.. redundant. Use all the fiber you can, and where you cannot - use Cat 6.

I'd look at the overall size of the area you are supposed to cover. Since you need both physical & logical redundancy... (are you going to run 2 Cat6 lines to each camera in case one fails?)
remember the cable length requirements, too.
I would think in a "star" topography, where you gather 32 or 64 cameras feeds on one aggregator switch, - spread out using one or two switches in each quadrant of the campus - ( or spread them out to cover grater areas if you need to) then using 3-5 of these switches, use fiber to bring it all down to one main feed.

Ultimately, you also need to consider the "consumer" of all this data. No human is going to be able to monitor 150+ cameras at one time. even if you cycle them one per second, there is 2.5 minutes of 'blind' time between cycles.
Plus 150 devices all on at all times.. feeding HD quality video.. is going to be an awful lot of bandwidth. You want this separate from the campus network just for that reason.. security is nice too.

If all this stuff is just going to be recorded, then you may want to separate each area of campus with it's own digital recorder. Then, make the data files from those boxes available over the network.

If you have a campus with 150+ cameras, the odds are good that you may need to record multiple feeds on demand.. if you aren't already recording 100%. Make sure you can switch any feed to any of your multiple recording devices.. and that your law enforcement folks are satisfied with the data format
--- before they need to use it as evidence.

If you are going to have 5 or 10 security personnel monitoring all 150 feeds - then I'd bring in a contractor ( like a Cisco partner) who has done stuff like this before. Make them meet the project requirements.

Get a better definition of what your bosses / project consumers mean by the redundancy requirements, and how much rack space they are willing to trade for super-expensive mini-switching equipment.




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