Moving our Class C to new ISP

BOTA-X
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My company owns a Class C network we pay for 1200 a year for, which I believe is directly to ARIN.  Right now our ISP is Level 3 communications, but we would like to get away from them.  Our information is on the WhoIs info so I believe that means we can take it with us.

https://ws.arin.net/whois/?queryinput=67.97.92.0

I would like to know what exactly we need to do to get traffic to route through the new ISP so that when we pull the plug on Level 3 we will still be reachable.  Can I simply enable RIP or OSPRF on our router to advertise the network to the new ISP?  Or do I need to update some routing information with ARIN?

Also, given that Level 3 owns 67.96.0.0 - 67.99.255.255, is that going to give us any problems taking a "reassigned" network with us?
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Istvan KalmarHead of IT Security Division
Top Expert 2010

Commented:
Hi,

It is intreresting..
If it subnets belongs to an ISP BGP network  you not able to move it other ISP, if is not belongs you able to change, please contact your local sales support, and ask it,.,..

Best regards,
Istvan
BOTA-XSenior Developer

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Commented:
I'm not sure I understand.  From looking at the registration information does it look like Level3 actually owns it?
BOTA-XSenior Developer

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Commented:
Bumping to 500 points if anyone can help with this.
Commented:
Please forgive if this does not apply for US ISP, but I believe it is the same as in Europe where I live.

The rules are very simple, when you normally buy some IP adresses at an ISP, you are not the legally owner, even if it shows that your company is the 'user' of the IP adresses. ISP's get their IP adresses from ARIN, RIPE etc in large blocks and then subdivide it to their customers.
So in effect, your company is just renting the IP adresses as long as you are customers at the same ISP.

Clearly, this is not optimal when you have change to another ISP and that is why some bright network admins register themselves as an ISP, recieving their own block of IP adresses directly from ARIN/RIPE etc. In effect, your company gets your own AS number (BGP) and if you someday move to another ISP, the new ISP will register your AS number, so it becomes globally routable. The new ISP will normally handle all this, just talk to the guy with higest BGP expertise and he should know all the drill.

In your situation, you are stucked because you dont own your own block of IP adresses. So you will need to change IP adresses yes, which can be a major workout for the network guys (and you I guess). However, a proper and well maintaned DNS schema will cut the most part of the work, at least when it comes to the application layer (web, mail etc). For VPN's and other more low-level services you have some work to be done. Ah, here's the beauty of DNS comes into play....

If you now understand the difference between ISP assigned IP adresses and IP adresses you are directly delegated from a RIR/LIR, you should apply for your own block before you start the IP adress change, so you never would have to change IP adresses again in near future.

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