IPV6 routing..

[gskhanna]

Hi,

We just received an ipv6 connection from a provider. We already are setup with a /126 between us on our ROUTER-A and them over a 1gb link. We can ping their side and they can ping us via ipv6 address.

Currently on the access router ROUTER-B we have individual servers in different vlans with ipv4 ips with gateways assigned in their vlan for them to connect.

1) I want to know how I can assign them an ipv6 /48 so they can use on their host machine in their vlan. We have already been allocated a /32 ipv6 block from ARIN.

Example:

interface vlan 1

ip address 10.10.10.1 255.255.255.0

ip address 10.10.11.1 255.255.255.0 secondary

and then the client would have 10.10.10.2 - 254 /24 and 10.10.12.-254 /24 on thier server.

If I wanted to do the same for ipv6, how would I do that? Would I just take the first address in the ipv6 /48 as I did in the ipv4 /24 above?

Example if I had ipv6 block: 2001:49f0:0000:0000:0000:0000:0000:0000

would it be:

interface vlan 1

ipv6 address 2001:49f0:0000:0000:0000:0000:0000:0001

ipv6 address 2001:49f0:0001:0000:0000:0000:0000:0001 secondary

2) I want to connect ROUTER-B that will have the vlan information for each server and the corresponding ipv6 addresses to ROUTER-A that has the direct ipv6 connection to the provider to RouterB.

How would I Put in a default IPV6 route so that ALL ipv6 traffic not local to Router-B to goto Router-A, which inturn would have a similar default route to the Provider?

if the link between the two is such:

Router-A

interface g1/1

ip address 10.10.20.1 255.255.255.252

ipv6 address 2001:49f0:0000:0000:0000:0000:0000:0001/126

Router-B

ipv6 route ipv6 route ::/0 2001:49f0:0000:0000:0000:0000:0000:0001

interface g1/1

ip address 10.10.20.2 255.255.255.252

ipv6 address 2001:49f0:0000:0000:0000:0000:0000:0002/126

Thanks you in advance for your help!

[gskhanna]

anyone?

[Harold Ritter]

1) If your block was 2001:49f0::/32

then you could indeed do something like this:

interface vlan 1

ipv6 address 2001:49f0::1/48

ipv6 address 2001:49f0:1::1/48

2) You would need to use a different subnet between Router-A and B since 2001:49f0::/48 overlaps with 2001:49f0::/126. Could be as follow:

On Router-A

interface g1/1

ipv6 address 2001:49f0:ffff::1/126

ipv6 route 2001:49f0::/48 2001:49f0:ffff::2

On Router-B:

interface g1/1

ipv6 address 2001:49f0:ffff::2/126

ipv6 route ipv6 route ::/0 2001:49f0:ffff::1

Hope this helps,

[gskhanna]

1) if I did that to the vlans, then what would the clients put on their machines to have that block? Can you provide an example.

2) That sounds what I was going to do.. thanks.

[Harold Ritter]

1) ipv6 autoconfiguration would be used for that purpose. Refer to the following document for more information on ipv6 autoconfiguration:

http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_7-2/ipv6_autoconfig.html

Hope this helps,