IPv6 configuration in dialer interface

[Satheesh80]

I am trying to find out if it is possible for a single dialer interface to negotiate and obtain both IPv4 and IPv6 address on a PPPoA session.

I am working on a dual-stack ADSL solution, and hence it would be helpful if someone can share their knowledge on this.

Thanks & Regards,
Satheesh

 

[burtsbees]

Depends on the image...post a sh ver. Also, what model router?

Burt

 

[Satheesh80]

Thanks Burt for immediate response.

I am planning to use a Cisco 877 as CPE, and since this is going to be a trial I can try any image for this model as suggested.

Regards
Satheesh K

 

[burtsbees]

Do you already have this router? Please post a sh ver and I can look up the features, or you can with this link...

http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp

If IPv6 is in there, then it should support negotiating an IPv6 address via the dialer interface, as long as the ISP RADIUS server that the Cisco gets the IP address from is an IPv6 address. Hope this helps.

Burt

 

[Satheesh80]

Hi Burt,

I think I have to clarify my question again

Can the dialer WAN interface (in CPE) negotiate and obtain both IPv6 address and IPv4 address at the same instance in a PPPoA session? This is required as I would have both IPv4-only and IPv6-only devices connected behind CPE.

I don't have the CPE router yet, and hence couldn't post the sh ver. Thanks for sparing your time to respond to my queries.

Regards,
Satheesh K

 

[burtsbees]

I think I see---you mean both ipv4 AND ipv6 at the same time? I would think the answer is no. Why would you want to do this? It can be either or, but not both at the same time. HTH.

Burt

 

[Satheesh80]

Hi Burt,

As mentioned before, I would have both IPv4-only and IPv6-only devices connected behind CPE which need to communicate natively with outside network.

I think for this, CPE has to be dual-stack and the dialer interface need to have both IPv4 & IPv6 address.

Regards
Satheesh

 

[burtsbees]

Well, the ipv4 and ipv6 nodes behind the router will be on separate networks, correct? This requires a L3 switch or other means of routing. Therefore, why would you need both on the WAN link?

Burt

 

[Satheesh80]

The CPE is dual-stack, and will have both IPv4 and IPv6 nodes on its LAN interfaces.

But the traffic has to be passed on natively on WAN dialer interface, and hence I feel it need to have both v4 and v6 address. Otherwise, I will be forced to use some tunneling approach over WAN which I don't want to go with.

Please suggest if there is any solution to this.

Regards
Satheesh

 

[burtsbees]

But the traffic has to be passed on natively on WAN dialer interface"
Why? Am I missing something? Are you planning to NAT? Any reason you can't separate IPv4 and IPv6?

Burt