dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
91717
share rss forum feed view:
watch


netcool
Premium,VIP
join:2008-11-05
Englewood, CO
kudos:86
reply to willmo

Re: [IPv6] Evidence of Comcast IPv6 CPE Dual Stack (CPE and CPEP

said by willmo:

Clearly packets from my LAN *are* making it out of my router into Comcast's network (the 2001:558 addresses), but Comcast is not routing packets to and/or from my LAN.

Can you run your tests again? Your CMTS wasn't properly advertising its IPV6 routes, we corrected the config and you should be good now.


NetDog
Premium,VIP
join:2002-03-04
Parker, CO
kudos:78
Reviews:
·Comcast
reply to willmo

said by willmo:

Seattle, WA (Capitol Hill)
SB6121
Netgear WNDR3700v1
OpenWRT trunk r37767 (I build it from source myself)
Performance

Your CMTS is enabled for IPv6 CPE, I just checked send me your CM MAC please so I can check your modem.
--
Comcaster.. Network Engineer with NETO

willmo

join:2013-06-03
Seattle, WA
reply to willmo

Actually it appears that my router is working, and Comcast just hasn't finished enabling IPv6 here yet.

My router itself has full IPv6 connectivity, but machines on my LAN can't reach the Internet. At first I assumed my router wasn't routing, but traceroute6 says otherwise. On the router:

# traceroute6 ipv6.test-ipv6.com
traceroute to ipv6.test-ipv6.com (2001:470:1:18::119), 30 hops max, 16 byte packets
 1  2001:558:600a:63::1 (2001:558:600a:63::1)  7.467 ms  7.149 ms  19.396 ms
 2  2001:558:a2:2037::1 (2001:558:a2:2037::1)  8.975 ms  9.811 ms  10.053 ms
 3  ae-20-0-ar03.seattle.wa.seattle.comcast.net (2001:558:a0:212::1)  10.455 ms  9.788 ms  9.513 ms
 4  he-1-7-0-0-11-cr01.seattle.wa.ibone.comcast.net (2001:558:0:f741::1)  10.425 ms  9.843 ms  11.317 ms
 5  if-xe-0-3-1.0.tcore1.00S-Seattle.ipv6.as6453.net (2001:5a0:1f00:200::d)  9.157 ms  7.804 ms  10.116 ms
 6  if-ae14.2.tcore1.PDI-PaloAlto.ipv6.as6453.net (2001:5a0:200:400::e)  36.608 ms  32.630 ms  30.402 ms
 7  if-ae2.2.tcore2.PDI-PaloAlto.ipv6.as6453.net (2001:5a0:1200:300::2)  27.083 ms  25.687 ms  27.414 ms
 8  if-ae5.2.tcore2.SQN-SanJose.ipv6.as6453.net (2001:5a0:1500:500::1)  48.423 ms  54.270 ms  36.242 ms
 9  gigabitethernet5-16.core1.sjc2.he.net (2001:470:0:196::1)  38.951 ms  38.941 ms  36.617 ms
10  10gigabitethernet1-1.core1.fmt1.he.net (2001:470:0:2f::1)  37.464 ms  36.564 ms  40.913 ms
11  ip119.gigo.com (2001:470:1:18::119)  37.621 ms  44.905 ms  39.549 ms
 

On a machine on my LAN:

$ traceroute6 ipv6.test-ipv6.com
traceroute6 to ipv6.test-ipv6.com (2001:470:1:18::119) from 2601:8:b1xx:xxxx:xxxx:xxxx:xxxx:xxxx, 64 hops max, 12 byte packets
 1  2601:8:b1xx:xxxx::1  1.131 ms  3.477 ms  1.396 ms
 2  2001:558:4082:63::1  9.603 ms  12.047 ms  10.439 ms
 3  2001:558:a2:2034::1  18.784 ms  17.231 ms  16.693 ms
[wait a while]
^C
 

Clearly packets from my LAN *are* making it out of my router into Comcast's network (the 2001:558 addresses), but Comcast is not routing packets to and/or from my LAN.

It's interesting how they do this in stages: last night my router wasn't getting any DHCPv6 responses, but it was spewing messages about being unable to reach several addresses in 2001:558:4082:63::/64. I assume it was receiving ICMPv6 packets and trying to respond, but couldn't because it didn't have an IPv6 address (?).

Oh well, I'm patient. :-)

Seattle, WA (Capitol Hill)
SB6121
Netgear WNDR3700v1
OpenWRT trunk r37767 (I build it from source myself)
Performance

willmo

join:2013-06-03
Seattle, WA
reply to NetDog

Looks like they're in the midst of enabling it here. comcast6.net says my CMTS is supported. test-ipv6.com says I have nothing, but machines on my LAN have an IP...or several...

en0: flags=8863 mtu 1500
ether 20:c9:xx:xx:xx:xx
inet6 fe80::xxxx:xxxx:xxxx:xxxx%en0 prefixlen 64 scopeid 0x4
inet6 2601:8:b1xx:xxxx:xxxx:xxxx:xxxx:xxxx prefixlen 64 autoconf
inet6 2601:8:b1xx:xxxx:xxxx:xxxx:xxxx:xxxx prefixlen 64 autoconf temporary
inet6 fd9f:xxxx:xxxx::xxxx:xxxx:xxxx:xxxx prefixlen 64 deprecated autoconf
inet6 2601:8:b1xx:xxxx::xxx prefixlen 64
inet 192.168.1.x netmask 0xffffff00 broadcast 192.168.1.255
media: autoselect
status: active


Very possible that my router is misconfigured or buggy (OpenWRT trunk from last night, with some old config files that probably need to be updated). I'm looking into it.


Madtown
Premium
join:2008-04-26
Madera, CA
Reviews:
·Comcast
reply to NetDog

Click for full size
Madera, Ca (Parkwood)

SB6121

Netgear WNDR3700

Performance
Expand your moderator at work


PaulGo

join:2005-01-29
Gaithersburg, MD
reply to Oregonian

Re: [IPv6] Evidence of Comcast IPv6 CPE Dual Stack (CPE and CPEP

Congratulations! You appear to have both IPv4 and IPv6 internet working. If a publisher publishes to IPv6, your browser will connect using IPv6. Your browser prefers IPv6 over IPv4 when given the choice (this is the expected outcome).

Your DNS server (possibly run by your ISP) appears to have IPv6 internet access.
Your Readiness Scores
10/10 Important Measure: Your IPv4 stability, when sites offer both IPv4 and IPv6
10/10 Long-Term: Your IPv6 readiness when sites go IPv6-only - NOT CRITICAL right now

North Potomac, MD
Netgear R6300 router
Motorola SB6141 modem



Oregonian
Premium
join:2000-12-21
West Linn, OR
Reviews:
·Comcast
reply to NetDog

Click for full size
West Linn, Oregon
SB6120 modem and a Linksys EA4500 router.

grod46

join:2012-11-25
Firebaugh, CA
Reviews:
·Comcast
reply to NetDog

Click for full size
comcast6.net
Click for full size
HTC One
Click for full size
Nexus 7
Click for full size
t
1:Firebaugh,Ca
2:SMCD3GNV (Bridged) to a D-LINK DIR-615

earletp

join:2004-02-03
PDX
reply to NetDog

Click for full size
Portland, Oregon
Motorola SB6120 to a Netgear WNDR4500


Scilicet
Spaced Out
Premium
join:2005-04-11
Aurora, CO
kudos:1
Reviews:
·Vonage

1 edit
reply to NetDog

Click for full size
1. Aurora, CO
2. Modem: Motorola SB6120
3. Neatgear WGR614v10 (not yet configured)

I hadn't noticed this until today. The modem has been at IPv4 for I don't know how long. I've been troubleshooting a network problem and the IPv6 popped up on the modem status page.

Edit: It would seem that the Netgear WGR614v10 does not support IPv6. Wonderful!
--
Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality. ~ Nikola Tesla


bradyr
Columbia College IT
Premium
join:2008-10-27
Sonora, CA
reply to NetDog


IPv6 Connection Type: Native with DHCP-PD
WAN IPv6 Address: 2001:558:6012:38:4c81:eba6:7420:3b8a/64
WAN IPv6 Gateway: fe80::201:5cff:fe3d:ac41
LAN IPv6 Address: 2601:c:9c80:7b:62a4:4cff:fe29:6cb8/64
LAN IPv6 Link-Local Address: fe80::62a4:4cff:fe29:6cb8/64
DHCP-PD: Enabled
LAN IPv6 prefix: 2601:c:9c80:7b::/64
DNS Address: 2001:558:feed::1 2001:558:feed::2



lit up IPv6 for a day and a half just for because. Everything seems ready to rock and roll. Might turn it on permanently once I get some proper IPv6 firewall rules setup.

-Sonora, CA (95370)
-Zoom 5341J
-ASUS rt-n66u running latest Merlin firmware (3.0.0.4.372.30_2 at the time of this post)


ViRGEdx

join:2002-10-25
reply to NetDog

Click for full size
1. Salem, OR
2. Modem: Motorola SB6121
3. Linksys E3000, Running Tomato USB (Toastman, latest)


Coelispex

join:2013-06-03
Wilmette, IL
Reviews:
·Comcast
reply to NetDog




1. Wilmette, IL (60091)
2. Modem: Motorola SurfBoard SB6141
3. Linksys EA2700 N600 Dual-Band Wireless-N Router

JNhome

join:2012-07-15
Salinas, CA
reply to NetDog

Click for full size
Went live in Salinas, CA (70mi south of San Jose) in June 2013

CplEstesUSMC

join:2005-02-16
Douglasville, GA
reply to NetDog

Click for full size
Winston Georgia
ASUS RT-N66U - Firmware 3.0.0.4.370_172-g85af9d0
I never got IPv6 address until my firmware was updated

bgoodbody
Bill G

join:2002-05-08
North Truro, MA

1 recommendation

reply to NetDog

The Cisco CMTS has begun.
»www.comcast6.net/
--
- Bill



pende_tim
Premium
join:2004-01-04
Andover, NJ
kudos:1
Reviews:
·Comcast
reply to NetDog

Click for full size
Have IPv6 running down here in Selbyville, DE 19975. Asus RT-N16/Tomato 1.28 behind a Zoom Model "J".
--
The difference between genius and stupidity is that genius has its limits.


NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage

1 recommendation

reply to NetDog

Add another D-Link router to the list of routers that seem to fully support Comcast's dual stack implementation. I've got to give D-Link a big thumbs up; they seem to be trying very hard to make their entire current residential/soho router product line IPv6 functional. Of course (as with most vendors) if you have an older hardware version that is not in current production, you will likely be out of luck unless your particular router is supported by OpenWRT, DDWRT, et al.

Netgear EBR-2310-C1 firmware rev 3.01






--
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.
Expand your moderator at work


artie

join:2002-07-14
Panama City, FL
reply to NetDog

Re: [IPv6] Evidence of Comcast IPv6 CPE Dual Stack (CPE and CPEP

Click for full size
1) Panama City, Florida
2) Direct Connect w/ Windows 7
3) ^

jmsq

join:2013-04-25
West Lafayette, IN
reply to NetDog

Click for full size
1) West Lafayette, IN
2) Linksys E3000 running Tomato


NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage

1 recommendation

reply to NetDog

Here are the test results using the D-Link DIR601-A1 with 1.04NA firmware I obtained from the D-Link Canadian web site: »www.dlink.com/ca/en/support/prod···=ca_reva

The D-Link US website does not have that firmware release, and it contains some significant improvements to IPv6 implementation over the 1.02NA firmware that is available on the D-Link US web site.






--
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.

fredthomsen
Premium
join:2011-03-01
Reviews:
·T-Mobile US
·Comcast
reply to NetDog

Click for full size
1) Germantown, MD
2) Netgear N900


Hertz

@cisco.com
reply to NetFixer

Motorola SB5101u
Linksys E3000 + Tomato firmware
San Jose, CA

dual stack works



NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage
reply to mountainman9

said by mountainman9:

That makes sense. Thanks for the explanation Netfixer!

There is nothing that says that IPv4 and IPv6 traffic to/from the same device/network has to take the same physical path. I separate public IPv4 and IPv6 traffic for both of my dual NIC servers (except for DNS traffic to DynDNS which I always make sure goes through the same registered gateway).


# My Linux server:
webhost:/ # ifconfig
eth0      Link encap:Ethernet  HWaddr E0:91:F5:95:A8:79
          inet addr:192.168.9.3  Bcast:192.168.9.255  Mask:255.255.255.0
          inet6 addr: 2601:5:c80:62:e291:f5ff:fe95:a879/64 Scope:Global
          inet6 addr: fe80::e291:f5ff:fe95:a879/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3023244 errors:0 dropped:536795 overruns:0 frame:0
          TX packets:4015237 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:228473361 (217.8 Mb)  TX bytes:1396973299 (1332.2 Mb)
          Interrupt:18 Base address:0xef00
 
eth2      Link encap:Ethernet  HWaddr 00:1E:90:C9:D8:1A
          inet addr:192.168.20.3  Bcast:192.168.20.255  Mask:255.255.255.0
          inet6 addr: fe80::21e:90ff:fec9:d81a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3443207 errors:0 dropped:536752 overruns:0 frame:0
          TX packets:420991 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:237028064 (226.0 Mb)  TX bytes:153485293 (146.3 Mb)
          Interrupt:19 Base address:0xd000
 
webhost:/ # netstat -r -n --inet --inet6
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
216.146.35.35   192.168.9.254   255.255.255.255 UGH       0 0          0 eth0
216.146.36.36   192.168.9.254   255.255.255.255 UGH       0 0          0 eth0
192.168.8.248   192.168.9.9     255.255.255.248 UG        0 0          0 eth0
192.168.1.248   192.168.9.9     255.255.255.248 UG        0 0          0 eth0
192.168.20.0    0.0.0.0         255.255.255.0   U         0 0          0 eth2
192.168.9.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
0.0.0.0         192.168.20.1    0.0.0.0         UG        0 0          0 eth2
Kernel IPv6 routing table
Destination                                 Next Hop                                Flags Metric Ref    Use Iface
2601:5:c80:62::/64                          ::                                      UA    256    637       0 eth0
fe80::/64                                   ::                                      U     256    0        0 eth2
fe80::/64                                   ::                                      U     256    0        0 eth0
::/0                                        fe80::1e7e:e5ff:fe4c:e6ff               UGDA  1024   0        0 eth0
::1/128                                     ::                                      U     0      136       1 lo
2601:5:c80:62:e291:f5ff:fe95:a879/128       ::                                      U     0      0        1 lo
fe80::21e:90ff:fec9:d81a/128                ::                                      U     0      0        1 lo
fe80::e291:f5ff:fe95:a879/128               ::                                      U     0      47       1 lo
ff02::1/128                                 ff02::1                                 UC    0      1        0 eth0
ff00::/8                                    ::                                      U     256    0        0 eth2
ff00::/8                                    ::                                      U     256    0        0 eth0
 
# My Windows server:
C:\>ipconfig
 
Windows IP Configuration
 
PPP adapter RAS Server (Dial In) Interface:
 
   Connection-specific DNS Suffix  . :
   IP Address. . . . . . . . . . . . : 192.168.9.208
   Subnet Mask . . . . . . . . . . . : 255.255.255.255
   Default Gateway . . . . . . . . . :
 
Ethernet adapter Local Area Connection 2:
 
   Connection-specific DNS Suffix  . : dcs-net.lan
   IP Address. . . . . . . . . . . . : 192.168.20.2
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.20.1
 
Ethernet adapter Local Area Connection:
 
   Connection-specific DNS Suffix  . : dcs-net
   IP Address. . . . . . . . . . . . : 192.168.9.2
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   IP Address. . . . . . . . . . . . : 2601:5:c80:62:e291:f5ff:fe95:beac
   IP Address. . . . . . . . . . . . : fe80::e291:f5ff:fe95:beac%4
   Default Gateway . . . . . . . . . : fe80::1e7e:e5ff:fe4c:e6ff%4
 
C:\>netstat -r
 
IPv4 Route Table
===========================================================================
Interface List
0x1 ........................... MS TCP Loopback interface
0x10002 ...00 53 45 00 00 00 ...... WAN (PPP/SLIP) Interface
0x10003 ...00 40 f4 2a 31 1e ...... Intel 21143-Based PCI Fast Ethernet Adapter (Generic)
0x10004 ...e0 91 f5 95 be ac ...... NETGEAR GA311 Gigabit Adapter
===========================================================================
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0     192.168.20.1     192.168.20.2     30
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1      1
    192.168.1.248  255.255.255.248      192.168.9.9      192.168.9.2      6
    192.168.8.248  255.255.255.248      192.168.9.9      192.168.9.2      4
      192.168.9.0    255.255.255.0      192.168.9.2      192.168.9.2     10
      192.168.9.2  255.255.255.255        127.0.0.1        127.0.0.1     10
    192.168.9.208  255.255.255.255        127.0.0.1        127.0.0.1     50
    192.168.9.255  255.255.255.255      192.168.9.2      192.168.9.2     10
     192.168.20.0    255.255.255.0     192.168.20.2     192.168.20.2     30
     192.168.20.2  255.255.255.255        127.0.0.1        127.0.0.1     30
   192.168.20.255  255.255.255.255     192.168.20.2     192.168.20.2     30
    216.146.35.35  255.255.255.255    192.168.9.254      192.168.9.2      8
    216.146.36.36  255.255.255.255    192.168.9.254      192.168.9.2      8
        224.0.0.0        240.0.0.0      192.168.9.2      192.168.9.2     10
        224.0.0.0        240.0.0.0     192.168.20.2     192.168.20.2     30
  255.255.255.255  255.255.255.255      192.168.9.2      192.168.9.2      1
  255.255.255.255  255.255.255.255     192.168.20.2     192.168.20.2      1
Default Gateway:      192.168.20.1
===========================================================================
Persistent Routes:
  Network Address          Netmask  Gateway Address  Metric
    216.146.35.35  255.255.255.255    192.168.9.254       8
    216.146.36.36  255.255.255.255    192.168.9.254       8
    192.168.8.248  255.255.255.248      192.168.9.9       4
    192.168.1.248  255.255.255.248      192.168.9.9       6
 
IPv6 Route Table
===========================================================================
Interface List
  5 ...ff ff ff ff ff ff ff ff  Teredo Tunneling Pseudo-Interface
  4 ...e0 91 f5 95 be ac ...... NETGEAR GA311 Gigabit Adapter
  3 ...e0 91 f5 95 ............ 6to4 Pseudo-Interface
  2 ...c0 a8 09 d0 ............ Automatic Tunneling Pseudo-Interface
  2 ...c0 a8 09 02 ............ Automatic Tunneling Pseudo-Interface
  2 ...c0 a8 14 02 ............ Automatic Tunneling Pseudo-Interface
  1 ........................... Loopback Pseudo-Interface
===========================================================================
===========================================================================
Active Routes:
 If Metric Network Destination      Gateway
  4   1016 2601:5:c80:62::/64       fe80::1e7e:e5ff:fe4c:e6ff
  4   1256 ::/0                     fe80::1e7e:e5ff:fe4c:e6ff
  2   1004 fe80::5efe:192.168.9.208/128
                                    fe80::5efe:192.168.9.208
  2   1004 fe80::5efe:192.168.9.2/128
                                    fe80::5efe:192.168.9.2
  2   1004 fe80::5efe:192.168.20.2/128
                                    fe80::5efe:192.168.20.2
  4   1004 2601:5:c80:62:e291:f5ff:fe95:beac/128
                                    2601:5:c80:62:e291:f5ff:fe95:beac
  4   1008 2601:5:c80:62::/64       On-link
  5   1004 fe80::ffff:ffff:fffd/128 fe80::ffff:ffff:fffd
  4   1008 ff00::/8                 On-link
  4   1004 fe80::e291:f5ff:fe95:beac/128
                                    fe80::e291:f5ff:fe95:beac
  1   1004 ::1/128                  ::1
  1   1008 ff00::/8                 On-link
  1   1004 fe80::1/128              fe80::1
===========================================================================
Persistent Routes:
  None
 



--
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.

mountainman9

join:2013-03-28
Broomfield, CO
reply to NetDog

That makes sense. Thanks for the explanation Netfixer!



NetFixer
Freedom is NOT Free
Premium
join:2004-06-24
The Boro
Reviews:
·Cingular Wireless
·Comcast Business..
·Vonage

1 edit
reply to mountainman9

This new behavior by »test-ipv6.com does not indicate a problem with your dual stack IPv6 connection. They have always tried to detect if you are using a tunnel (and they used to do it successfully), but their current AS number comparison test needs some tweaking on their end.

If you go to »as.robtex.com/as7922.html and »as.robtex.com/as33652.html you can see that AS7922 feeds AS33652. This apparently is confusing the »test-ipv6.com tunnel test. An additional routing step != a tunnel.



--
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.

mountainman9

join:2013-03-28
Broomfield, CO
reply to NetDog

Westminster, CO

Looks like dual stack is working here but I'm getting a message about it appearing I have a non-managed tunnel configuration because they are showing 2 different ASNs.

Your IPv4 address on the public Internet appears to be 98.x.x.x
(CMCS - Comcast Cable Communications, Inc.)

Your IPv6 address on the public Internet appears to be 2601:1:xxxx:xx:xxxx:xxxx
(COMCAST-7922 - Comcast Cable Communications, Inc.)

Since you have IPv6, we are including a tab that shows how well you can reach other IPv6 sites. [more info]

It appears that you use a non managed tunnel mechanism for either IPv4 or IPv6. [more info]

Good news! Your current configuration will continue to work as web sites enable IPv6. [more info]

Your DNS server (possibly run by your ISP) appears to have IPv6 Internet access.
Your readiness score
10/10 for your IPv6 stability and readiness, when publishers are forced to go IPv6 only


Find IPv4 Service Provider
ok (0.270s) using ipv4 ASN 33652
Find IPv6 Service Provider
ok (2.105s) using ipv6 ASN 7922



NetDog
Premium,VIP
join:2002-03-04
Parker, CO
kudos:78
Reviews:
·Comcast

2 recommendations

reply to Chris 313

User NetFixer is correct Windows XP doesn't support DHCPv6 so a tunnel would be the only thing you get. But this is why a Windows XP device will work behind a router, your router will send the RA to the XP box and tell it what to do.

Bottom line Comcast only supports DHCPv6\DHCPv6-PD on the WAN side of your modem.
--
Comcaster.. Network Engineer with NETO