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

1 edit

IPv6 vs IPv4 reliability through my Comcast connection

I am posting this example of the IPv6 vs IPv4 reliability on my Comcast connection as a comment because the official review update will not allow imbedded code (which is needed to illustrate my point).

Shown below is a prime example of the problem. This is of course, not Comcast's fault; it is just an indication of the current state of IPv6 implementation on the Internet (and it does not just occur with Yahoo!):


C:\>ping l.yimg.com
 
Pinging ds-fo-anyycs-l.ay1.b.yahoodns.net [2001:4998:f00d:1fc::c:1103] 
from 2601:5:c80:a1:e291:f5ff:fe95:beac with 32 bytes of data:
 
Reply from 2001:4998:f00d:1fc::c:1103: time=24ms
Reply from 2001:4998:f00d:1fc::c:1103: time=23ms
Reply from 2001:4998:f00d:1fc::c:1103: time=40ms
Reply from 2001:4998:f00d:1fc::c:1103: time=24ms
 
Ping statistics for 2001:4998:f00d:1fc::c:1103:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 23ms, Maximum = 40ms, Average = 27ms
 
C:\>ping l.yimg.com
 
Pinging ds-fo-anyycs-l.ay1.b.yahoodns.net [2001:4998:f00b:1fb::c:1101] 
from 2601:5:c80:a1:e291:f5ff:fe95:beac with 32 bytes of data:
 
Reply from 2001:4998:f00b:1fb::c:1101: time=49ms
Reply from 2001:4998:f00b:1fb::c:1101: time=46ms
Reply from 2001:4998:f00b:1fb::c:1101: time=44ms
Reply from 2001:4998:f00b:1fb::c:1101: time=50ms
 
Ping statistics for 2001:4998:f00b:1fb::c:1101:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 44ms, Maximum = 50ms, Average = 47ms
 
C:\>ping l.yimg.com
 
Pinging ds-fo-anyycs-l.ay1.b.yahoodns.net [2001:4998:f00b:1fb::c:1103] 
from 2601:5:c80:a1:e291:f5ff:fe95:beac with 32 bytes of data:
 
Request timed out.
Request timed out.
Request timed out.
Request timed out.
 
Ping statistics for 2001:4998:f00b:1fb::c:1103:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
 


An attempt to access http://my.yahoo.com during the above time frame (with native IPv6 active) results in an extremely long delay (like several minutes) in loading the Yahoo! start page, or a browser timeout. And once again I will reiterate that this symptom also happens on sites other than Yahoo!.

Shown below are repeated successfull IPv4 pings to the same host name:

C:\>ping -4 l.yimg.com
 
Pinging ds-fo-anyycs-l.ay1.b.yahoodns.net [206.190.56.191] with 32 bytes of data:
 
Reply from 206.190.56.191: bytes=32 time=34ms TTL=54
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
 
Ping statistics for 206.190.56.191:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 33ms, Maximum = 34ms, Average = 33ms
 
C:\>ping -4 l.yimg.com
 
Pinging ds-fo-anyycs-l.ay1.b.yahoodns.net [206.190.56.191] with 32 bytes of data:
 
Reply from 206.190.56.191: bytes=32 time=32ms TTL=54
Reply from 206.190.56.191: bytes=32 time=32ms TTL=54
Reply from 206.190.56.191: bytes=32 time=32ms TTL=54
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
 
Ping statistics for 206.190.56.191:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 32ms, Maximum = 33ms, Average = 32ms
 
C:\>ping -4 l.yimg.com
 
Pinging ds-fo-anyycs-l.ay1.b.yahoodns.net [206.190.56.191] with 32 bytes of data:
 
Reply from 206.190.56.191: bytes=32 time=31ms TTL=54
Reply from 206.190.56.191: bytes=32 time=32ms TTL=54
Reply from 206.190.56.191: bytes=32 time=32ms TTL=54
Reply from 206.190.56.191: bytes=32 time=32ms TTL=54
 
Ping statistics for 206.190.56.191:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 31ms, Maximum = 32ms, Average = 31ms
 
C:\>ping -4 l.yimg.com
 
Pinging ds-fo-anyycs-l.ay1.b.yahoodns.net [206.190.56.191] with 32 bytes of data:
 
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
Reply from 206.190.56.191: bytes=32 time=35ms TTL=54
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
 
Ping statistics for 206.190.56.191:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 33ms, Maximum = 35ms, Average = 33ms
 
C:\>ping -4 l.yimg.com
 
Pinging ds-fo-anyycs-l.ay1.b.yahoodns.net [206.190.56.191] with 32 bytes of data:
 
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
Reply from 206.190.56.191: bytes=32 time=32ms TTL=54
Reply from 206.190.56.191: bytes=32 time=33ms TTL=54
Reply from 206.190.56.191: bytes=32 time=32ms TTL=54
 
Ping statistics for 206.190.56.191:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 32ms, Maximum = 33ms, Average = 32ms
 


--
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.


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

1 edit

1 recommendation

It is possible that the IPv6 problems I was seeing were related to my DIR655 sometimes getting a "/60" and sometimes getting a "/64" PD prefix assignment combined with a CMTS bug. See NetDog See Profile's post »Re: [IPv6] Comcast IPv6 Address Assignment/Delegation for details. Since that announcement, I have only been getting the "/64" PD prefix assignments, and I do not currently see the problem with CDN and round robin IPv6 servers frequently not responding.
--
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.

brockalee

join:2003-08-17
Jacksonville, FL
Just wanted to say thanks for posting all this info. I was basically just trying to get a feel for Comcast VOIP reliability and you gave a lot of great info in your posts. Thanks!