 NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4
 ·Comcast
| reply to brad
Re: [IPv6] Comcast IPv6 Address Assignment/Delegation said by brad: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  .. |
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Reviews:
·Comcast
| reply to NetDog
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? |
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 NetFixerFrom my cold dead handsPremium
join:2004-06-24
The Boro
·Comcast Business..
 ·Vonage
 ·Cingular Wireless
·Comcast
1 edit | 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.
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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. |
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| The whole internet connection would be lost? You mean even the IPv4 internet? |
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 graysonfPremium,MVM
join:1999-07-16
Fort Lauderdale, FL | reply to NetFixer
Any suggestion for values to try on a router that supports multiple LAN interfaces?
IPv6 Prefix Delegation:
Site-Level Aggregator ID: ?
ISP Prefix Length: /? |
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NetFixerFrom my cold dead handsPremium
join:2004-06-24
The Boro Reviews:
·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast
| reply to graysonf
Re: [IPv6] Comcast IPv6 Address Assignment/Delegation 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).
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:
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.
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).
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.
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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. |
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| reply to graysonf
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.
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 |
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NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4 Reviews:
·Comcast
| reply to amwdrizz
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
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NetFixerFrom my cold dead handsPremium
join:2004-06-24
The Boro Reviews:
·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast
| 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).
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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. |
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| reply to jjmb
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? |
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biomeshPremium
join:2006-07-08
Tomball, TX | 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. |
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| What allocation is it for 1 address (a router with dhcp) |
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NetFixerFrom my cold dead handsPremium
join:2004-06-24
The Boro Reviews:
·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast
| 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.
-020513.png/thumb.jpg "Click for full size")
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.
-020413.png "9106 bytes")
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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. |
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Reviews:
·Comcast
| 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. |
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NetFixerFrom my cold dead handsPremium
join:2004-06-24
The Boro Reviews:
·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast
| 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. |
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Reviews:
·Comcast
| 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. |
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NetFixerFrom my cold dead handsPremium
join:2004-06-24
The Boro Reviews:
·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast
| 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.
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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. |
|
Reviews:
·Comcast
| 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. |
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| reply to amwdrizz
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. |
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-020513.png "Click for full size")
