Best way to have redundant internet?

Hi,
we have 2 internet lines from the same provider coming into our office.

both have seperate static IP's, and DNS is setup. both lines are used independantly but we would like a solution ideally where if one line fails it will automatically switch over to the live line.

I know that some routers are able to do this, but can anyone recommend a good router lower than £500.

We think we have the DNS worked out where we can set the TTL to 1 hour and then we can push the update manually. (again if a better way someonne can recommend then please do)
KenziiAsked:
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Brian HarringtonIT ManagerCommented:
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richardsk-octjamaicaCommented:
You can try using Endian Community Edition open-source software which does fail-over very simply. All you need is a old box to act as a server with three network cards one for your local network interface, ISP 1 and lastly your fail-over ISP 2. It can be (if enabled) a proxy server with content filtering, smtp (mail relay), DHCP server (if enabled), NTP server, and can also be a VPN server and supports NTLM. You can check them out at www.endian.com
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