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Posted by on May 28, 2007, 9:15 am
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Hi,
Need advice as to whether or not this is possible... We have several
ethernet building control devices that we want to connect to Cable/DSL
modems for internet access to their web pages and so they can
communicate with eachother. The catch is that each controller needs
to be configured with a static Public IP address and not a local IP
address. This is because each controller sends its static IP address
to the other controllers so they can talk to eachother on demand.
Will it be possible to arrange with ISP's to assign static Public IP
addresses to our building controllers, even though each controller
will be sitting behind Cable/DSL Modems?
Many thanks,
Ellis
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Posted by f/fgeorge on May 28, 2007, 10:39 am
On 28 May 2007 06:15:25 -0700, gabovitche@yahoo.com wrote:
>Hi,
>
>Need advice as to whether or not this is possible... We have several
>ethernet building control devices that we want to connect to Cable/DSL
>modems for internet access to their web pages and so they can
>communicate with eachother. The catch is that each controller needs
>to be configured with a static Public IP address and not a local IP
>address. This is because each controller sends its static IP address
>to the other controllers so they can talk to eachother on demand.
>
>Will it be possible to arrange with ISP's to assign static Public IP
>addresses to our building controllers, even though each controller
>will be sitting behind Cable/DSL Modems?
>
>Many thanks,
>
>Ellis
Yes, my Comcast Business cable modem has a second port that the
assigned IP address goes thru.
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Posted by Tom Stiller on May 28, 2007, 11:51 am
gabovitche@yahoo.com wrote:
> Hi,
>
> Need advice as to whether or not this is possible... We have several
> ethernet building control devices that we want to connect to Cable/DSL
> modems for internet access to their web pages and so they can
> communicate with eachother. The catch is that each controller needs
> to be configured with a static Public IP address and not a local IP
> address. This is because each controller sends its static IP address
> to the other controllers so they can talk to eachother on demand.
I can understand why the IP addresses have to be fixed, but Why do they
have to be public?
>
> Will it be possible to arrange with ISP's to assign static Public IP
> addresses to our building controllers, even though each controller
> will be sitting behind Cable/DSL Modems?
--
Tom Stiller
PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
7BDA 71ED 6496 99C0 C7CF
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Posted by Warren H on May 28, 2007, 1:14 pm
gabovitche@yahoo.com wrote:
> Need advice as to whether or not this is possible... We have several
> ethernet building control devices that we want to connect to Cable/DSL
> modems for internet access to their web pages and so they can
> communicate with eachother. The catch is that each controller needs
> to be configured with a static Public IP address and not a local IP
> address. This is because each controller sends its static IP address
> to the other controllers so they can talk to eachother on demand.
>
> Will it be possible to arrange with ISP's to assign static Public IP
> addresses to our building controllers, even though each controller
> will be sitting behind Cable/DSL Modems?
What the hell is a "control device" or "controller"? Since their getting
IP addresses, can we assume they're actually routers?
I can understand why they might need static IP addresses, but why would
they need to be public IP addresses? If they're public IP addresses, not
only can they communicate with each other, but everyone in the world can
communicate with them, too. Also, with public IP addresses, the route
between them will go back to the headend or central office for your ISP,
where certain ports will be blocked preventing you from sharing files
and printers.
I'm assuming this is a business, so you're likely to have greater
security needs than a home user, so depending on NAT and the simple
firewall features built into the typical home broadband router, you'll
need to maintain three separate firewalls as well.
Essentially, the topology you're proposing is to set-up three separate
networks, comparable to three neighbors on a street, each with their own
home network. But even if you have static public IP addresses, you won't
be able to communicate between the networks. In addition to the ISP
blocking certain ports, you can run into some subnet issues as well.
Both cable and DSL providers can provide multiple IP addresses at an
additional cost. Nearly all DSL providers, and many cable providers can
also offer static IP address, but those usually come with business-level
accounts. But I don't think getting multiple static public IP's is going
to get you the results you are looking for.
Also, since these "control devices" have IP addresses, meaning they're
likely actually routers, I have to wonder why? There might be some
specific situation in which you want to essentially be running three
separate networks in the same building, and still need them to act as a
single network for some purposes, but that's a fairly advanced topology.
It's far more likely that the "control devices" are actually hubs or
switches, but in that case, they wouldn't even have IP address, let
alone public IP addresses.
I'd suggest you contact your IT consultant to discuss exactly what it is
that you have, and what you need to get the results you want. (And I
know you can't be the IT guy because if you were, you wouldn't be
talking about "controllers". You'd be using meaningful terminology.) I'm
positive that whatever you actually need is entirely possible. What
you're asking for now, however, will not accomplish even the very basic
needs you're also communicating.
--
Warren H.
==========
Disclaimer: My views reflect those of myself, and not my
employer, my friends, nor (as she often tells me) my wife.
Any resemblance to the views of anybody living or dead is
coincidental. No animals were hurt in the writing of this
response -- unless you count my dog who desperately wants
to go outside now.
Maintain your landscape with Black & Decker:
http://www.holzemville.com/mall/blackanddecker
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Posted by Elmo P. Shagnasty on May 28, 2007, 1:52 pm
> What the hell is a "control device" or "controller"? Since their getting
> IP addresses, can we assume they're actually routers?
he said "building control devices". I presume he meant
security-oriented pieces--door controllers, alarm controllers, HVAC
controllers, whatever.
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