Wireless Access

Hi all,

I am planning to implement a dual-homed ISP with non-provider independent IPv6 addresses. Still trying to get my head about certain part of the design.

1) If each ISP provides their own IPv6 /48 range, how will the client know which ISP IPv6 address to use? I am assuming that the clients will get IPv6 addresses from both ISP.

2) If my SD branch gateway is running active-backup for the ISP links, how will the clients route to the Internet if ISP A is the active link and ISP B IPv6 IP address is used by the client?

3) Do i configure both IPv6 IP address on the controllers/switches/APs etc?

4) If the switches/servers/APs/gateways have both IPv4 and IPv6, which will have priority? Which will be the preferred network used?

5)  Should we be getting provider independent IPv6 addresses instead and route form BGP with both ISP? That should solve everything.

Thanks.

Regards,
Victor

If you are running SD-Branch, the gateway is performing the routing and NAT.  Your ISP connections will terminate at the gateway, you aren't forwarding (switching) the ISP connections through the gateway.

Hi Carson, 

yes. thank you for your input. My branch gateway will be routing for IPv6.

with dual homed isp, is having a provider independent IPv6 /48 or /56 the best option?

if each isp gives me their Pa IPv6 pool, does that mean I have to assign 2 ip address(one from each range) to the network infra/servers and endpoints? Then the question of the how the endpoint chooses which IPv6 address and how they are going to route if that isp is down comes into the picture. 

You need your own address space internally, you can't use what the ISP(s) are providing as they own the routing for that address space.  Same as IPv4.  Once you have your own address space you can then setup the ISPs as peers and utilize routing to provide failover or load balancing or whatever you are trying to achieve.

Hi Carson,

I have been trying to contact the ISP to ask for Provider independent IP address. They were saying they cannot provide provider independent IPv4 addresses for their services. A bit ???? to me. They have not gotten back to me on IPv6 addresses.

For IPv4, i can still do nat at the Branch gateway so my endpoints can just use their private IPv4 addresses and nat to the internet if needed.

For IPv6, in the event that the ISPs are providing only their own IPv6 IP addresses range, what options do I have with 2 ranges of IPv6 IP addresses? How will the endpoints or servers work? Each to have 2 IPv6 addresses (one from each ISP)? I am also in favour of Provider-independent IPv6 addresses,

Thank you.