I have an HTTP server behind Microsoft load balancing. DNS is provided by the hosting provider.

I want to increase the available bandwidth by adding another internet ISP.

How can I ensure availability when one carrier is down?

What kind of router do I need?

How can the servers remain on line if the static IP is provided by a specific carrier?

closed as not a real question by MDMarra, Dave M, mgorven, mdpc, Khaled Mar 7 '13 at 7:49

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If you want to properly handle multiple lines you have two options.

First Option

Set up your DNS with a very low TTL for the domain, when the primary connection goes down, update this with the IP given to you by the second ISP. This of course is manual, it might be possible to set up something with DYDNS, and some monitoring scripts.

Second Option

Do it properly and obtain an AS number and your own IP address range. You can then have your IP range made reachable from both connections from multiple ISPs (possibly even more than 2). This does cost money and time, but it is a much more stable and permanent solution.

  • what is an AS number? how can i obtain it? – user2119955 Mar 6 '13 at 15:34
  • can i buy another router another isp line another static ip another nic and add the second ip to host provider dns configuration panel? is it another solution? – user2119955 Mar 6 '13 at 15:36
  • An AS number is an Autonomous System number, basically it identifies you as a piece of the internet, not just a user connected to an ISP. read a bit more here : en.wikipedia.org/wiki/Autonomous_System_(Internet) – NickW Mar 6 '13 at 15:42
  • As for your second solution, it will work, but if you do something like round robin DNS, the DNS doesn't know if a line is up or down, so it will give out address 1, or 2, and if that line is down, the site is unavailable for that user.. so it really isn't a solution which will increase your availability. – NickW Mar 6 '13 at 15:44
  • why you have closed the question? – user2119955 Mar 7 '13 at 9:45

How can I ensure availability when one carrier is down?

Get a router that supports active/active load balancing of outbound connections.

What kind of router do I need?

One that meets your needs. Call your preferred vendor like Cisco, Juniper, Extreme, etc and ask them what products they have in your price range for your requirements.

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