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Author Topic: IPv6 - where are we now? (2015-12)  (Read 14071 times)

Chrysalis

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Re: IPv6 - where are we now? (2015-12)
« Reply #15 on: June 14, 2016, 07:56:02 PM »

yes dhcp6 is isp side.

for lan side it uses router advertisement.
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aesmith

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Re: IPv6 - where are we now? (2015-12)
« Reply #16 on: June 15, 2016, 01:57:46 PM »

So WAN side give you an IPv6 host address?   Have you been issued a prefix for your internal network, or is that pushed out to you as well? 

For comparison my router gets an IPv6 WAN address, but I need to configure the LAN side of the router with the /64 that A&A are currently routing onto my line.  I'm not sure whether whether either A&A or my kit support PD so I need to put that prefix in manually.   Then it's up to me to configure via my preferred combination of RA and/or DHCP.  (Currently using stateful DHCP by the way, but stateless works as well with my kit).
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Chrysalis

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Re: IPv6 - where are we now? (2015-12)
« Reply #17 on: June 15, 2016, 07:56:20 PM »

the wan side gives you the prefix. usually a /64

by the way I not yet tested if sky have routed a ipv6 subnet to my line.  Still configured to use the HE tunnel.
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Weaver

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Re: IPv6 - where are we now? (2015-12)
« Reply #18 on: June 16, 2016, 12:38:36 AM »

What size prefixes are BT and Sky et al giving out now then? Can you actually ask them for whatever you need?

I have a /48 and an extra /64 from AA, but I think I can get more /64s with no ceremony needed, if memory serves.
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gt94sss2

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Re: IPv6 - where are we now? (2015-12)
« Reply #19 on: June 16, 2016, 12:52:54 AM »

For BT Infinity, I have been issued a 2a00:23c4:XXXX:1::/64 address

As its a residential service, that doesn't offer static IP addresses I doubt they will give me more!

I presume it may well be different on their business orientated services..

On the Home Hub I am currently using, the allocation method is set to Stateless but Stateful mode is a option I can pick

« Last Edit: June 16, 2016, 12:56:27 AM by gt94sss2 »
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Chrysalis

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Re: IPv6 - where are we now? (2015-12)
« Reply #20 on: June 16, 2016, 12:57:40 AM »

who needs more than a /64?
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Hibbard

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Re: IPv6 - where are we now? (2015-12)
« Reply #21 on: June 16, 2016, 06:57:15 AM »

For BT Infinity, I have been issued a 2a00:23c4:XXXX:1::/64 address

As its a residential service, that doesn't offer static IP addresses I doubt they will give me more!

I presume it may well be different on their business orientated services..

On the Home Hub I am currently using, the allocation method is set to Stateless but Stateful mode is a option I can pick
Which hub and firmware build can I ask?
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Chrysalis

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Re: IPv6 - where are we now? (2015-12)
« Reply #22 on: June 16, 2016, 07:38:27 AM »

I did a check now, no ipv6 issued to my router from sky.

Of course I am assuming sky are using a compatible system.
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aesmith

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Re: IPv6 - where are we now? (2015-12)
« Reply #23 on: June 17, 2016, 07:14:44 AM »

the wan side gives you the prefix. usually a /64

Can I confirm we're talking about the same thing, I must admit that when talking/thinking IPv6 I sometime revert to thinking in IPv4 terms. 

For comparison on my connection I get a WAN address for the WAN interface.  My DSL is PPPoA so I believe that's negotiated by PPP (IPCP?) rather than DHCP.  (I'll need to remember to look at a PPPoE customer to see if that uses DHCP, but my guess would still be IPCP).    The WAN address prefix is different from the /64 prefix assigned to my line for me to use internally.

I'll need to have a check - I'd assumed that the customer/internal prefix wasn't pushed out as I'd seen no mention of this possibility either in the router documentation or A&A, however I might have missed it, or maybe the function doesn't work on PPPoA or on my kit.

    WAN  2001:8b0:1111:1111:0:ffff:xxxx:a27e
Internal 2001:8b0:fff3:yyyy::/64


By the way, for those of us who remember Novell addressing, we now have the option to make addresses contain silly words once more.
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Weaver

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Re: IPv6 - where are we now? (2015-12)
« Reply #24 on: June 17, 2016, 10:37:57 AM »

@aesmith I think you're correct, AA uses PPP IPCP. I believe my router, a Firebrick, gets a separate address for its own WAN via PPP, but I have to set up a LAN address-range assignment by hand on the Firebrick.

I have noticed comic addresses such as face:b00c.
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Chrysalis

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Re: IPv6 - where are we now? (2015-12)
« Reply #25 on: June 17, 2016, 01:05:38 PM »

In every instance of using ipv6 whether it be home isp or datacentre it has used DHCPv6 for me, I suppose tho there will be isp's out there not using it and deploying it via another system.

In regards to pppoe and pppoa, the authentication to the isp is typically done over ipv4, so the ipv6 doesnt also need to use ppp as the connection to the isp is already established.

If I recall correctly tho aaisp setup their system so ipv6 connectivity can stay online if there is a ipv4 outage, so that probably explains why they using PPP IPCP.  The basics are the same tho, AAISP will have issued a prefix to you, and thats what needs configuring on the router if its not an automatic process.
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aesmith

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Re: IPv6 - where are we now? (2015-12)
« Reply #26 on: June 17, 2016, 02:04:00 PM »

Cheers.   I might be wrong about IPCP, looking at Cisco documentation they seem to sort of piggyback DHCPv6 over the top of PPP, using the accounting mechanisms.   On a quick skim that could either be just a Cisco specific thing, or it may refer only to the back end and not how the IPv6 information is passed up to the client.    I'm not sure that the authentication is necessarily IPv4, at the authentication stage the remote device doesn't yet have an IP address, and in fact PPP could theoretically be carrying a different L3 protocol anyway.
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Chrysalis

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Re: IPv6 - where are we now? (2015-12)
« Reply #27 on: June 17, 2016, 02:43:36 PM »

There is an ip address, its just not presented to you.
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aesmith

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Re: IPv6 - where are we now? (2015-12)
« Reply #28 on: June 17, 2016, 07:23:16 PM »

You mean as used between the gateway and the RADIUS server?  That need bear no relation to the IP address subsequently issued to the PPP client, it won't in fact know which address to issue until the authentication is successful.
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aesmith

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Re: IPv6 - where are we now? (2015-12)
« Reply #29 on: June 18, 2016, 08:44:37 AM »

By the way have you ever worked on a deployment using other than ISP provided addressing?   That seems to be the big unknown in terms of design guides etc at the moment, whether to use PI, or to use addressing from one of your providers and use NAT when accessing the Internet via any other ISP, or use ULA and always NAT.
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