Topic 'Re: [IPv6] Comcast IPv6 Address Assignment/Delegation' in forum 'Comcast HSI' - dslreports.com

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Mon, 01 Apr 2013 11:49:46 EDT

KPEX posted : Just wanted to share an example of a working configuration I put together for the Juniper Netscreen firewalls, after I spent way too long trying to figure it all out only to realize in the end that I had to also specify the IAPD and SLA fields for Prefix Delegation. Once I did this, everything worked!
»kevpeterson.com/comcast-ipv6/

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Fri, 29 Mar 2013 07:17:43 EDT

bjbrock9 posted : I assume you will be rolling out a dual stack so I can still use my IPv4 VPN until I'm ready to switch to an IPv6 VPN. I'll have to run a dual stack at the home office since I have 150 branches with numerous ISP's. I'm assuming I can pass IPv6 traffic through the IPv4 IpSec VPN but don't know for sure. I know my Vyatta router here has that capability.

Let me think about it.

Thanks again for your help.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Thu, 28 Mar 2013 12:44:52 EDT

NetDog posted : We will be starting really soon.. Don't wait on AT&T get a tunnel.. :) Here I two tunnel brokers I have used and still using for testing.

»www.sixxs.net/
»tunnelbroker.net/
--
Comcaster.. Network Engineer with NETO

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Thu, 28 Mar 2013 06:48:49 EDT

bjbrock9 posted : Thank you for that offer. I need to get my home office converted first, though. And waiting on AT&T is like waiting on a snail. But as soon as I have that under my belt I'm going to start on my branches.

Most of my Comcast offices are in Illinois, 600 miles away. I will want to travel there and be on hand instead of trying to do it remotely. Where will you be rolling out the first trials?

Thanks again, NetDog. I'm sure I will be in touch.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 27 Mar 2013 14:47:57 EDT

NetDog posted : bjbrock9 PM me your contact info and I will see if I can add you to the trial list if you would like.
--
Comcaster.. Network Engineer with NETO

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 27 Mar 2013 14:45:08 EDT

NetDog posted : Commercial accounts are a different story, static IP's vers dynamic. So No your Commercial accounts will not be configured the same way, and as well if they are static.

We are getting ready to trial the commercial accounts here shortly we had issues with the code on the modems that needed to get worked out.
--
Comcaster.. Network Engineer with NETO

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 27 Mar 2013 13:48:42 EDT

bjbrock9 posted : I'm sure this works well for residential sites that only need one simple configuration, but what about commercial customers that need a more complex routing structure. Is the process the same for commercial customers?

I have several small branches that use Comcast. I know my routers won't do /60 prefixes and I will need more than one sub-net at the locations.

I was simply going by the RFC's and I'm sure different ISP's will do different implementations (just like they do with IPv4). But every stray from standards makes it harder for me, the consumer, to keep up with configurations.

AT&T will be upgrading my Home Office MIS to IPv6 and it will be interesting to see their take on it.

Thank you for giving me the reasoning behind Comcast's method. Will my commercial accounts be configured this same way?

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 27 Mar 2013 12:53:31 EDT

NetDog posted :

said by bjbrock :

Since there are approximately 35 trillion possible Site ID's, it is egregious to force you to one IP not to mention thumbing their nose at the RFC's and beautifully designed IPv6.

We are talking about Comcast here so I will give input from a Comcast point of view..

Comcast uses DHCPv6 and DHCPv6-PD to allocate its customer IP addresses if your using IPv4 or IPv6. With that said the router needs to request three addresses:

Single IPv4 Address for the Routers WAN
Single IPv6 Address for the Routers WAN
Prefix-Delegation for the LAN interface (routers can request a smaller prefix up to a /60)
--
Comcaster.. Network Engineer with NETO

Comcast IPv6 Home User

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 27 Mar 2013 12:27:59 EDT

anon posted : According to the IPv6 RFC's, Your ISP should not be assigning you an IP but rather a 48-bit Global ID(Site ID). The next 16 bits should be your's for sub-netting anyway you want. This give you a 64-bit prefix plus a 64-bit identifier for your IPv6 address of your router or modem. The ISP then routes according to the Global ID and not the IP. Routing is done by routing to your 48-bit Global ID and the next-hop is the link-local address of your router or modem. Since there are approximately 35 trillion possible Site ID's, it is egregious to force you to one IP not to mention thumbing their nose at the RFC's and beautifully designed IPv6. IMHO.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Mon, 18 Mar 2013 01:27:01 EDT

PGHammer posted : In the case of computer operating systems, in the case of Windows, it's Windows XP SP2 and later, as Windows Vista/7/8 support IPv6 out of the box (regardless of the bitness of the operating system itself).

Apple - All versions of OS X back to Tiger support IPv6 out of the box.

Linux distributions - While all Linux kernels from 2.6.x out have support for it, some distributions actually have said support turned off by default by user-community request.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Sat, 09 Feb 2013 05:43:54 EDT

NetFixer posted :

said by Mike Wolf:

Honestly I've never fully understood how IPv6 works, I'd love to learn but till I'm in the mood for my head to explode I'm comfortable just happy "It works" lol
I'd love to find a router that fully supports all of what IPv6 offers, I mean on all my systems there's no IPv6 DHCP lease information and no IPv6 DHCP settings on the router side.

When you do get in the mood, there are some basic tutorial links at Comcast's IPv6 Information Center to get you started. Until then, there is no point in worrying about whether your router supports multiple IPv6 networks on its LAN side because you would not be ready to implement it. Also, if you are using recent versions of Windows, OS X, or a recent *nix distribution, IPv6 on the client side should indeed work automatically.

And FWIW, there is a reason that I picked both of the IPv6 routers that I use from Comcast's approved/tested list. IPv6 has a way of making everyone's head explode.
--
A well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.

When governments fear people, there is liberty. When the people fear the government, there is tyranny.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Sat, 09 Feb 2013 05:21:12 EDT

Mike Wolf posted : Honestly I've never fully understood how IPv6 works, I'd love to learn but till I'm in the mood for my head to explode I'm comfortable just happy "It works" lol
I'd love to find a router that fully supports all of what IPv6 offers, I mean on all my systems there's no IPv6 DHCP lease information and no IPv6 DHCP settings on the router side.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Sat, 09 Feb 2013 01:20:19 EDT

NetFixer posted :

said by Mike Wolf:

This is all I see on my router regarding IPv6 so I don't even know if it can support /128 or /60 or something.

The fact that your router does not report the assignment size for its WAN interface pretty much implies that it is properly getting a /128 (which is the size for a single IP address, and that is all a router's WAN needs).

Your screen shot also clearly shows that you are getting the current maximum /64 assignment on the router's LAN. There is really no way to tell if your router can support a /60 network assignment until Comcast once again starts issuing the /60 assignments. However, it you did not previously (before last week) get a /60 network assignment, then your router probably doesn't support it.
--
A well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.

When governments fear people, there is liberty. When the people fear the government, there is tyranny.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Sat, 09 Feb 2013 00:49:08 EDT

Mike Wolf posted : This is all I see on my router regarding IPv6 so I don't even know if it can support /128 or /60 or something.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Sat, 09 Feb 2013 00:35:59 EDT

NetFixer posted :

said by Mike Wolf:

What allocation is it for 1 address (a router with dhcp)

A router's WAN should receive a /128 with a prefix beginning with "2001:558". A router's LAN should receive a /64 with the PD prefix beginning with "2601". If your router is capable of supporting multiple IPv6 networks on its LAN, you will currently also receive a network /64 assignment with a PD prefix beginning with "2601". The image below (from my DIR655) illustrates this.

[att=1]

After Comcast finishes upgrading their CMTS software, you may (or may not) be able to get a network /60 assignment for a PD prefix starting with "2601" as illustrated below with a snapshot of my DIR655 IPv6 status taken before Comcast temporarily rolled back giving out /60 assignments.

[att=2]
--
A well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.

When governments fear people, there is liberty. When the people fear the government, there is tyranny.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Fri, 08 Feb 2013 23:40:47 EDT

Mike Wolf posted : What allocation is it for 1 address (a router with dhcp)

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Fri, 08 Feb 2013 15:37:22 EDT

biomesh posted : Probably due to the fact that very few people can or will use a /60 effectively.

I doubt there are any business class customers that could use 256 /64s vs the 16 with a /60.

I am guessing as time goes on, this may change and larger allocations may be made available.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Fri, 08 Feb 2013 12:19:55 EDT

MrJester posted :

said by jjmb:

We will be changing the defaults later this year so that /60 is the default.

I am very glad you are considering the future and not sticking users with a single /64. From an academic perspective, can you share the rationale behind choosing a /60 instead of /56?

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 05 Feb 2013 16:44:01 EDT

NetFixer posted :

said by NetDog:

I would like to give everyone a heads up, we are changing the allowed shortest prefix from /60 to a /64. There is an issue found on a version of CMTS code that creates an issue for the CMTS. Once all the CMTS's get upgraded to the latest code we will change the shortest prefix back to a /60.

So if you have a IA_PD request as a /60 the DHCP server will respond with a /64. So leave your IA_PD request as a /60 once we get the code in the field and change the DHCP back your request will be honored.

If you have any questions please feel free to PM me if you want. I will answer what I can; as you all are aware.

Thanks for the heads up. I suspect that I must have gotten caught up in the middle of the config changes yesterday: »[IPv6] IPv6 problems with router's factory MAC address

After reading your post, I tried the DIR655's original WAN MAC address again, and now it works again (with a "/64" allocation).
--
A well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.

When governments fear people, there is liberty. When the people fear the government, there is tyranny.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 05 Feb 2013 13:09:16 EDT

NetDog posted : I would like to give everyone a heads up, we are changing the allowed shortest prefix from /60 to a /64. There is an issue found on a version of CMTS code that creates an issue for the CMTS. Once all the CMTS's get upgraded to the latest code we will change the shortest prefix back to a /60.

So if you have a IA_PD request as a /60 the DHCP server will respond with a /64. So leave your IA_PD request as a /60 once we get the code in the field and change the DHCP back your request will be honored.

If you have any questions please feel free to PM me if you want. I will answer what I can; as you all are aware.

Sample from a Cisco router:


HomeRT01#show ipv6 dhcp interface 
GigabitEthernet0/1.201 is in server mode
  Using pool: phones
  Preference value: 0
Vlan101 is in client mode
  Prefix State is OPEN
  Renew will be sent in 1d03h
  Address State is OPEN
  Renew for address will be sent in 1d03h
  List of known servers:
    Reachable via address: FE80::
    DUID: 
    Preference: 255
    Configuration parameters:
      IA PD: IA ID 0x00120001, T1 172683, T2 276293
        Prefix: 2601:1:Something::/64
                preferred lifetime 345367, valid lifetime 345367
                expires at Feb 08 2013 02:22 PM (270975 seconds)
      IA NA: IA ID 0x00120001, T1 172800, T2 276480
        Address: 2001:558:6040:5:Something/128
                preferred lifetime 345600, valid lifetime 345600
                expires at Feb 08 2013 02:22 PM (270973 seconds)
      DNS server: 2001:558:FEED::2
      DNS server: 2001:558:FEED::1
      Information refresh time: 0
  Prefix name: prefix-from-Comcast
  Prefixes sent as hint:
    ::/60

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 30 Jan 2013 21:11:10 EDT

mackey posted :

said by graysonf:

Site-Level Aggregator ID: ?

Whatever you want, but when added to the prefix length the number of bits in it must be less than or equal to 64. I.e. if your prefix length is /64 then this must be 0. If your prefix length is /60 then it must be between 0 and 15 inclusive (0-15 = a 4-bit number. 4 + 60 = 64). This number is added to your prefix to get the subnet for that interface.

said by graysonf:

ISP Prefix Length: /?

The size of the prefix you're requesting from the ISP. Eventually Comcast will support /60-/64 inclusive, but for now only /64 works reliably.

/M

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 30 Jan 2013 17:18:34 EDT

NetFixer posted :

said by graysonf:

Any suggestion for values to try on a router that supports multiple LAN interfaces?

IPv6 Prefix Delegation:

Site-Level Aggregator ID: ?
ISP Prefix Length: /?

Sorry, but the only router I have that supported getting a /60 (for a while) was my D-Link DIR655, and I don't have access to the low level configuration in that router (my only choice in its html menu is to either enable/disable DHCP-PD).

[att=1]

When I was getting a /60 from Comcast the config above was also being used, and a secondary router behind the DIR655 was able to get its own /64 IPv6 subnet. I have no idea why I no longer get a /60 from Comcast.

The screen shot below shows what I would get from Comcast when the /60 was working:

[att=2]

The DIR655 would get an IPv6 Network assignment of 2601:5:c80:90::/60, and its LAN would get the IPv6 assignment 2601:5:c80:91::/64. Unfortunately I did not get a screen capture of the secondary router's assignment, but as I recall it was 2601:5:c80:92::/64.

Now that I only get a /64 assignment, I get the same 2601:5:c80:90::/64 for both the Network and LAN.

[att=3]

My secondary (guest network) router is now connected directly (well, actually through a switch), to the modem and it still gets its own /64 assignment (it's just not a subnet of the DIR655's former /60 network).

One interesting thing is that just before I stopped getting the /60 assignment, Comcast changed the Network PD IP address from 2601:5:c80:90::/60 to 2601:5:c80:b0::/60. The next change was to eliminate the /60 assignment (but I went back to the 2601:5:c80:90: subnet again).

[att=4]

I guess that the point of this TLDR reply is to point out that Comcast's IPv6 implementation for dynamic IP address customers is still in flux (and may possibly stay that way), so even if you get something to work today, don't count on it to be working the same way tomorrow. If/when Comcast finally gets IPv6 for static IP business class customers working, I may go back to paying for static IP addresses again.
--
A well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.

When governments fear people, there is liberty. When the people fear the government, there is tyranny.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 30 Jan 2013 11:06:12 EDT

graysonf posted : Any suggestion for values to try on a router that supports multiple LAN interfaces?

IPv6 Prefix Delegation:

Site-Level Aggregator ID: ?
ISP Prefix Length: /?

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 30 Jan 2013 11:04:57 EDT

Mike Wolf posted : The whole internet connection would be lost? You mean even the IPv4 internet?

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 30 Jan 2013 01:40:26 EDT

NetFixer posted :

said by Mike Wolf:

What would requesting a smaller prefix entail, what would I gain, and what would I lose?

It would entail having a router that was capable of maintaining multiple VLANS/LAN subnets, and the ability to be configured to request a PD other than the standard /64 from Comcast.

What you might gain is the ability to have multiple /64 IPv6 networks behind your router (how you would use them is up to you).

What you might lose is your internet connection if your router somehow got a /60 from Comcast and didn't know how to handle it.
--
A well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.

When governments fear people, there is liberty. When the people fear the government, there is tyranny.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 30 Jan 2013 01:26:06 EDT

Mike Wolf posted : Not sure what you mean by "back to a dialogue"
Anyway if you guys wanna do some testing on the IPv6 stuff, your're welcome to use me as a test subject :) What would requesting a smaller prefix entail, what would I gain, and what would I lose?

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Wed, 30 Jan 2013 00:58:00 EDT

NetDog posted :

said by brad:

said by NetDog:

[att=1]

LOL. I love the Cray supercomputer icon for your Windows server ;) Is that what the current requirement is for running Windows? :P

Not many people get that joke :)..

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 23:21:50 EDT

brad posted :

said by AVonGauss:

I wasn't aware that U-verse was offering native IPv6 at this point, though admittedly I don't follow it as closely as I once did. If they are now offering it to residential U-verse subscribers that is good news indeed. We might just get this IPv6 migration thing done in under two decades after all. ;-)

It isn't native yet. They're using 6RD.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 23:20:32 EDT

brad posted :

said by NetDog:

[att=1]

LOL. I love the Cray supercomputer icon for your Windows server ;) Is that what the current requirement is for running Windows? :P

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 22:10:06 EDT

AVonGauss posted :

said by mackey:

On Uverse, AT&T offers a /60 for each IPv4 address you have.

/M

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 21:56:49 EDT

NetDog posted : So here is what I have for my network..

Main network
Kids network (monitored)
Office network
Voice network
Guest Wifi network

[att=1]

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 21:35:09 EDT

mackey posted :

said by AVonGauss:

Its far more than I personally was expecting from any decently sized residential provider to offer.

On Uverse, AT&T offers a /60 for each IPv4 address you have.

/M

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 20:57:53 EDT

AVonGauss posted : Oh I'm sure we can come up with all sorts of nifty ways to use routable IPv6 segments, but from the home user perspective, I think most other than a truly isolated guest network are probably more a product of tinkering rather than a definable need. I think Comcast's approach of providing additional routable segments only to those that request and know how to with DHCP-PD to be a very good compromise. Its far more than I personally was expecting from any decently sized residential provider to offer.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 19:59:21 EDT

whfsdude posted :

said by AVonGauss:

While I'm glad Comcast is going to give out a /60, and I'm not trying to pick on you personally, but you're saying 295,147,905,179,352,825,856 IPv6 addresses just won't be enough for say 256 real / virtual devices in the home?

Each VLAN or routed segment should be a /64 for the foreseeable future (netstacks stink, even without SLAAC in use). Which is why some segment (edit: network-pun unintended) of Comcast's residential users will need a /60.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 19:51:31 EDT

AVonGauss posted : While I'm glad Comcast is going to give out a /60, and I'm not trying to pick on you personally, but you're saying 295,147,905,179,352,825,856 IPv6 addresses just won't be enough for say 256 real / virtual devices in the home?

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 18:16:50 EDT

mackey posted :

said by NetDog:

This is totally the type of innovation I was looking for in that comment..

No, the way you phrased it and stated the obvious ("If not there is no point in asking for anything less then /64") it was clearly a challenge while saying you didn't think there was any reason to request something larger then a /64.

Of course there are multiple VLANs attached to it; I wouldn't be requesting something larger then a /64 otherwise. All the PCs and tablets are on one, a "guest" network is another, there are 4 or 5 VoIP phones and an Asterisk box on yet another, a locked down network that's only used for cleaning viruses, and while it's not really used any more, yet another is set up that had a couple file servers/NAS boxes on it.

Yes I'm aware that's only 5, and yes I'm aware that a /60 can be broken into 16 subnets, but there's no reason to be stingy with v6 addresses like there is with v4's and I like having elbow room to handle whatever tomorrow throws at me. I prefer to configure stuff once and not look at it again for quite a long time ;)

I considered the VPN angle, but for my needs there's no reason to have an internet routable address assigned to that interface.

/M

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 17:14:37 EDT

NetDog posted :

said by biomesh:

My guess is that users will setup guest vlans or networks.

This is what I am doing as well..

said by biomesh:

This could also be used for vpn configurations in order to isolate their 'business network' from their 'home network'.

This is totally the type of innovation I was looking for in that comment.. I didn't even think about a VPN type VLAN back to the office..

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 17:05:46 EDT

NetDog posted :

said by Mike Wolf:

How do I know if my Linksys router supports these different things? Is there a way for Comcast to check?

Ok back to a dialogue??? :)

Tell you the truth I only know two routers that support the a smaller prefix hint. Cisco IOS and a Cisco RV042G, other then that I have not tried other devices. But if you request a smaller prefix the DHCP server will grant to your device but depending on the CMTS your on will depend on if your route will get injected. It is safe at this time to just stick with the /64.

I will post when it is safe to request a smaller prefix.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 17:01:57 EDT

AVonGauss posted :

said by mackey:

RFC 6177 says ISPs should issue something significantly larger then a /64 and "the default assignment size should take into consideration the likelihood that an end site will have need for multiple subnets in the future and avoid the IPv4 practice of having frequent and continual justification for obtaining small amounts of additional space."

I need more then a single /64. I shouldn't need to justify requesting something as tiny as a /60. Back on page 1 jjmb said the default size later this year will be a /60. Why are you guys even thinking about doing that if you feel no one has a valid reason for getting anything larger then a /64?

/M

A bit of an over reaction, no? It was simply a question asked, not a demand for justification on how or for what purpose are you planning on using it - a fair question. I'd be willing to bet if we really took a look at it, this would fall more under the "I want to tinker" category, which is alright, but lets not masquerade it as something which it is not.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 16:58:28 EDT

biomesh posted : My guess is that users will setup guest vlans or networks. This could also be used for vpn configurations in order to isolate their 'business network' from their 'home network'.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 16:52:12 EDT

Mike Wolf posted : How do I know if my Linksys router supports these different things? Is there a way for Comcast to check?

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 16:50:16 EDT

NetDog posted : This is me just asking a question, trying to understand what people are thinking. Yes I have read that RFC, and a lot of others on IPv6 as well. I was thinking we could have a dialogue about this subject but I guess not.

So I will leave topic with this "Comcast will change the default to a /60 at a later date, but today it is /64. If your device supports requesting a smaller prefix up till a /60 you can request it."

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 16:09:59 EDT

NetFixer posted :

said by mackey:

I need more then a single /64. I shouldn't need to justify requesting something as tiny as a /60. Back on page 1 jjmb said the default size later this year will be a /60. Why are you guys even thinking about doing that if you feel no one has a valid reason for getting anything larger then a /64?

It's called the left hand vs right hand syndrome. It is a common malady in many (if not most) large organizations. :hmm:
--
A well-regulated militia, being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.

When governments fear people, there is liberty. When the people fear the government, there is tyranny.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 15:42:51 EDT

mackey posted :

said by NetDog:

Does your CentOS Box have more then one VLAN or LAN behind the WAN? If not there is no point in asking for anything less then /64? Do you really need that may networks that a /60 will give you? Just asking...

I thought this thread was about the current state of getting something larger then a /64 on Comcasts' network, not justifying the need for something larger. My bad.

RFC 6177 says ISPs should issue something significantly larger then a /64 and "the default assignment size should take into consideration the likelihood that an end site will have need for multiple subnets in the future and avoid the IPv4 practice of having frequent and continual justification for obtaining small amounts of additional space."

I need more then a single /64. I shouldn't need to justify requesting something as tiny as a /60. Back on page 1 jjmb said the default size later this year will be a /60. Why are you guys even thinking about doing that if you feel no one has a valid reason for getting anything larger then a /64?

/M

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 10:46:08 EDT

NetDog posted :

said by mackey:

said by magamiako:

Whenever I configure my juniper to request ::/60 ; I'll receive a /64 back from Comcast.

If I create another IAPD-ID, say, 1, and put another preference for ::/60, I'll get another /64 back, but all routing then stops for the original /64 I received. I assume because it's overwriting the route entry on the ISP end with the new /64.

I'm seeing something similar using WIDE-DHCPv6 on a Linux (CentOS) box.

If I request ::/60 I just get a /64 back. However, if I request 2 IA_PD's in the same request using different ID's, the server happily obliges. (The packet looks something like "Req IA_NA, ID 0; Req IA_PD, ID 1; Req IA_PD, ID 2"). Both of the returned /64's work fine after a several seconds/minute delay (I'm assuming the routes are propagating during this time).

/M

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 01:16:29 EDT

mackey posted :

said by magamiako:

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Tue, 29 Jan 2013 00:16:13 EDT

NetDog posted :

said by magamiako:

I've sent my flow logs off to Juniper to see if they can figure it out and give me an answer.

PM me the Juniper case number and I will troubleshoot this on my end as well. PM me your model number as well.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Mon, 28 Jan 2013 20:51:08 EDT

magamiako posted : Okay,

Rephrasing here.

Whenever I configure my juniper to request ::/60 ; I'll receive a /64 back from Comcast.

If I create another IAPD-ID, say, 1, and put another preference for ::/60, I'll get another /64 back, but all routing then stops for the original /64 I received. I assume because it's overwriting the route entry on the ISP end with the new /64.

** So I think I found my problem **

It seems the SSG5 is not passing the IA_PD Prefix option aloing with the IA_PD Option. Which would explain why I'm getting a /64, because the DHCP server is defaulting to a /64 when no request for a larger prefix comes through.

I've sent my flow logs off to Juniper to see if they can figure it out and give me an answer.

Re: [IPv6] Comcast IPv6 Address Assignment/Delegation

Thu, 24 Jan 2013 21:31:42 EDT

AVonGauss posted : Boynton Beach, two hours south of Orlando - 45 minutes north of Miami - and one very neglected Cisco CMTS needing attention. It doesn't even have upstream bonding yet, it might take a week on-site to get in to shape - or at least that's what I'd put on the travel requisition.