[c-nsp] multihoming solution over two different ISP's

[Joe Maimon]

Get a 2950 or even a 3524XL, use vlans and subinterfaces.

Use BGP if available.

Otherwise, if you are already using NAT, then this should work fine.

http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html

https://supportforums.cisco.com/docs/DOC-8313

If you need redundancy and incoming IP reachability, and you cannot get 
BGP/Public IP addresses from your existing ISP's, you can obtain it from 
other ISP's, even if all they can offer you is a tunnel.

Joe

Martin T wrote:
> At the moment I have a following setup:
>
> http://img69.imageshack.us/img69/4227/252530.png
>
> The ISP-A connection is the primary link and the ISP-B connection(over
> WiMAX) is the backup one. In case the primary link fails, I physically
> plug out the fiber-optical converter cable from my Cisco router(Cisco
> 1841) and insert the one from WiMAX device. In addition, I reconfigure
> the IP parameters in the router. This is probably the most manual
> "multihoming" possible :) I'm ready to upgrade my router so it
> supports two Ethernet cables.
>
> a) Is it somehow possible to automatically switch over to another one
> connection in case the primary one fails. For example ping
> www.google.com over a period of time and in case it doesn't respond,
> automatically switch over to backup connection?
>
> b) Is it somehow possible to have one static IP address while using
> the services of two different IPSs?
>
>
> While I'm afraid the latter is impossible, the first automatic
> switchover should be somehow doable, shouldn't it? As I told, I'm
> ready to invest into new equipment if it's necessary.
>
> PS I'm aware, that probably the most elegant solution would be a BGP
> sessions with ISP routers over different last-mile technologies. This
> would provide fast failover and I could use one IP address.
>
>
> What are the best practices for multihome connection over two different ISP's?
>
>
> regards,
> martin
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