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US Cable Support > Comcast HSI > [IPv6] Evidence of Comcast IPv6 CPE Dual Stack (CPE and CPEPD)

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EG
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join:2006-11-18
Union, NJ
kudos:9

reply to santy

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

You're golden.
to forum · permalink · 2013-03-30 01:10:25 ·


Chris 313
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join:2004-07-18
Houma, LA
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Your IPv4 address on the public internet appears to be 174

Your IPv6 address on the public internet appears to be 2002:

World IPv6 day is June 8th, 2011. No problems are anticipated for you with this browser, at this location. [tech details]

Congratulations! You appear to have both IPv4 and IPv6 internet working. If a publisher publishes to IPv6, your browser will connect using IPv6. Note: Your browser appears to prefer IPv4 over IPv6 when given the choice. This may in the future affect the accuracy of sites who guess at your location.

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

Houma, La
Currently direct connected to a Arris 722G while awaiting my new router.
Windows XP SP3

to forum · permalink · 2013-03-31 09:59:05 ·


NetFixer
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The Boro
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·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast
1 edit

said by Chris 313:

Your IPv4 address on the public internet appears to be 174

Your IPv6 address on the public internet appears to be 2002:

...

Currently direct connected to a Arris 722G while awaiting my new router.
Windows XP SP3

FWIW, you are not currently using Comcast's native dual stack; you are using a 6to4 tunnel. Try the test at »test-ipv6.com/ to see details (this is the test that Comcast based their test on, but Comcast has not updated their copy of the code to provide the additional information that the current test provides).

A ray of hope is that possibly your new router might be able to utilize Comcast's native dual stack since Windows XP's IPv6 implementation doesn't natively support DHCPv6 and that may be why you are currently using a 6to4 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.
to forum · permalink · 2013-03-31 17:29:26 ·


NetDog
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join:2002-03-04
Parker, CO
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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

to forum · permalink · 2013-04-01 12:59:45 ·

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

to forum · permalink · 2013-04-04 13:25:59 ·


NetFixer
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The Boro
Reviews:
·Comcast Business..
·Vonage
·Cingular Wireless
·Comcast
1 edit

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.
to forum · permalink · 2013-04-04 16:05:12 ·

mountainman9

join:2013-03-28
Broomfield, CO

reply to NetDog
That makes sense. Thanks for the explanation Netfixer!

to forum · permalink · 2013-04-04 18:15:57 ·


NetFixer
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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.
to forum · permalink · 2013-04-04 19:32:38 ·


Hertz

@cisco.com

Motorola SB5101u
Linksys E3000 + Tomato firmware
San Jose, CA

dual stack works

to forum · permalink · 2013-04-05 16:47:15 ·
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