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Author Topic: Dual routers / Dual ISP Question  (Read 4696 times)

tcp179

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Dual routers / Dual ISP Question
« on: March 06, 2010, 09:18:22 AM »

Hi, in a small business, with 2 ISPs, each connected to its own router (no BGP, simply two static IPv4 0/0 routes redistributed into the IGP with one preferred over the other), I created a regular tunnel from my primary Cisco router.  This is the router used unless of failure.  I internally assigned the routed /48, which I subnetted into /56's for individual sites, and /64's for the actual internal VLANs.

Right now, if the primary ISP fails, there will be no tunnel to the IPv6 Internet.  Should I create another tunnel for my secondary router and simply not assign the /48?  What happens during a failure?  Will my primary /48 get routed over the second tunnel?  I assume not, however I also assume it may not really matter because both /48's are part of the tunnelbroker IPv6 space, which, is basically treated as a single IPv6 ISP.

Can someone confirm that?  If it works this way, I'd make sure I create the second tunnel to peer with a different city, i.e. primary New York, secondary Ashburn VA. 

Does anyone have any other ideas on how dual-homing could be setup?

Many thanks!  Great website & service!
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broquea

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Re: Dual routers / Dual ISP Question
« Reply #1 on: March 06, 2010, 09:47:45 AM »

The /48 is statically routed through 1 tunnel, if that tunnel goes down, so does your /48. The IPv6 ranges are PoP specific, so NYC space isn't statically routed to anything in Ashburn. If you want redundancy, get yourself a shiny ASN and IPv6 allocation! :D Then you can set up redundant BGP tunnels with us! YAY!
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tcp179

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Re: Dual routers / Dual ISP Question
« Reply #2 on: March 06, 2010, 10:22:12 AM »

Thanks for the quick reply broquea!

That makes sense.  And, if I understand correctly, if I had 2 tunnels with 2 different routed /48's, I'd have to rely on stateless autoconfiguration of my internal hosts, but then, I can't have my internal servers with static IPv6 addresses, which would be show-stopper.

So, dual-homing absolutely requires BGP. 

Do you think BGP for IPv6 will be more universally deployed than with our current IPv4 even in small businesses and homes?  I guess I could try and get a 'shiny' new BGP AS but I'm worried the registrar only gives that to ISP's and large enterprises! 
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broquea

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Re: Dual routers / Dual ISP Question
« Reply #3 on: March 06, 2010, 11:01:04 AM »

Do you think BGP for IPv6 will be more universally deployed than with our current IPv4 even in small businesses and homes?  I guess I could try and get a 'shiny' new BGP AS but I'm worried the registrar only gives that to ISP's and large enterprises!  

No, I don't expect residential to ever use BGP considering the cost of membership, annual fees, etc. Small businesses are a maybe, and only really if they opt for multi-homing at the office, or in colo/IXes.

Also it isn't a registrar that allocates ASNs, it is the RIR, and the same folk that hand out IPv6 allocations. If a small business that wanted to be multi-homed with IPv6 wanted, they'd get membership with their RIR, apply for the ASN and IPv6 space. If all goes according to plan, they get both the ASN and IPv6 allocation and have their upstreams speak BGP with them and accept their announcement of the allocation.
« Last Edit: March 06, 2010, 12:18:31 PM by broquea »
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