DaemonPremium
join:2003-06-29
San Francisco, CA Reviews:
 ·webpass.net
 ·AT&T U-Verse
 ·Comcast
4 edits | [IPv6] ipv6 address received, but not routing I have several macs connected to an airport extreme that is setup in IPv6 router mode, which is then connected to an SB6121 I activated this evening. During activation, I was directly connected to the modem and IPv6 worked great. I then put the modem behind the airport extreme, and it didn't work so well anymore.
It's currently not working for several reasons:
-no hosts, including the router, appear to be able to get on the IPv6 internet.
-the router is only getting ipv6 DNS servers, no ipv4. Because ipv6 is not working, this means that no computers get working DNS queries, which borks everything. I have worked around this by manually adding 75.75.75.75 as a DNS server to each computer. This is an issue that only started happening in the last 2 hours or so. (maybe comcast is messing with settings)
Some info:
-All machines get IPv6 addresses in the 2601:9:: space
-All machines autoget a DNS server in the same /64, which I presume is the router, as well as the IPv4 DNS 10.0.0.1 (which is the router's private IPv4 address)
-All machines have an fe80:: router/gateway assigned to them, which is pingable on en0. (i just learned you have to specify the interface to ping a link-local address) It does not appear to be the same private address given to the router per Airport Utility, and I am not sure where it comes from at all. I attempted to extract the MAC from the link local address and didn't find anything close-- it certainly doesn't seem to be the router or the modem.
-The router has a 2001:558 address assigned to it automatically, and has 2001:558:feed::1 and ::2 as DNS servers. Although the machines get a 2601:9:: DNS server automatically, no 2601:9:: address for the router appears anywhere I can find.
-Airport utility uses link-local IPv6 and is working just fine.
-One additional network detail: the main router has its wireless network extended by two other airport extremes, all running firmware 7.6.2. The issues above happen no matter which computer is attached to which router, though, so I'm not sure if it's relevant or not.
Questions:
Anyone have any idea why the entire IPv6 internet would be unreachable? I can't ping any IPv6 addresses except the local machine from itself. Is it normal for the router to be in 2001:558 and the computers in 2601:9? Why am I no longer getting IPv4 DNS servers via comcast's DHCP servers?
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-Ryan
I use Linux, OS X, iOS and Windows. Let the OS wars die. |
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DaemonPremium
join:2003-06-29
San Francisco, CA Reviews:
·webpass.net
·AT&T U-Verse
·Comcast
| at 12:40AM PDT, the router received a new lease on both IPv4 and IPv6 with updated settings that fixed this issue. Must have been overnight maintenance and a misconfigured setting or something.
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-Ryan
I use Linux, OS X, iOS and Windows. Let the OS wars die. |
|
 whfsdudePremium
join:2003-04-05
Washington, DC
 ·T-Mobile US
| reply to Daemon
said by Daemon:Anyone have any idea why the entire IPv6 internet would be unreachable? I can't ping any IPv6 addresses except the local machine from itself. Is it normal for the router to be in 2001:558 and the computers in 2601:9? Why am I no longer getting IPv4 DNS servers via comcast's DHCP servers?
These are the exact addresses you should be seeing. So this is working for you now? |
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DaemonPremium
join:2003-06-29
San Francisco, CA Reviews:
·webpass.net
·AT&T U-Verse
·Comcast
| said by whfsdude:These are the exact addresses you should be seeing. So this is working for you now?
Yep, it's working. When I ran the comcast testipv6 site, it told me I didn't have an ipv6 address, but the public version of the same test came back 10/10 for ipv6 and ipv6 only sites like ipv6.google.com work no problem.
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-Ryan
I use Linux, OS X, iOS and Windows. Let the OS wars die. |
|
DaemonPremium
join:2003-06-29
San Francisco, CA | reply to Daemon
So it just went down again. Same problem. It appears to be a DNS issue and not a routing issue. It did come back up a few minutes later, though.
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-Ryan
I use Linux, OS X, iOS and Windows. Let the OS wars die. |
|
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whfsdudePremium
join:2003-04-05
Washington, DC Reviews:
·T-Mobile US
| Can you ping6 external hosts? Eg. ping ipv6.google.com
Edit: keep in mind happy eyeballs means that v6 won't always be preferred in situations where the IPv4 path is 300ms faster. If you are on wireless you might flap between v4 and v6 in a browser. |
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DaemonPremium
join:2003-06-29
San Francisco, CA Reviews:
·webpass.net
·AT&T U-Verse
·Comcast
| reply to Daemon
When it's down, it's difficult to ping anywhere, because DNS queries do not resolve and I do not have the IPv6 addresses memorized.
When it's down NO DNS queries work, so it appears as though the internet is down entirely, though sites where the DNS info is cached locally still work. It's been more stable in the last 24 hours, though.
--
-Ryan
I use Linux, OS X, iOS and Windows. Let the OS wars die. |
|
 graysonfPremium,MVM
join:1999-07-16
Fort Lauderdale, FL | If you suspect DNS problems, try using others. Here's one from HE:
2001:470:20::2 |
|
 NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4
1 edit | reply to Daemon
Please use the Comcast v6 anycast DNS Servers:
2001:558:feed::1
2001:558:feed::2 |
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| Looks like NetDog had a typo, the servers are:
2001:558:FEED::1
2001:558:FEED::2 |
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DaemonPremium
join:2003-06-29
San Francisco, CA Reviews:
·webpass.net
·AT&T U-Verse
·Comcast
2 edits | reply to NetDog
said by NetDog:Please use the Comcast v6 anycast DNS Servers:
2001:5589:feed::1
2001:5589:feed::2
said by nate1234:Looks like NetDog had a typo, the servers are:
2001:558:FEED::1
2001:558:FEED::2 said by Daemon:-The router has a 2001:558 address assigned to it automatically, and has 2001:558:feed::1 and ::2 as DNS servers.
--
-Ryan
I use Linux, OS X, iOS and Windows. Let the OS wars die. |
|
| reply to Daemon
Looks like Comcast in the Carmel NY District turned it on. My router picked up the primary and secondary DNS P6 addresses. They're routed back to Connecticut. System seems to be running fine. |
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NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4 Reviews:
·Comcast
| reply to nate1234
said by nate1234:Looks like NetDog had a typo, the servers are:
2001:558:FEED::1
2001:558:FEED::2
Thanks for picking up on that.. |
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NetDogPremium,VIP
join:2002-03-04
Parker, CO
kudos:4 Reviews:
·Comcast
| reply to YukonHawk
said by YukonHawk:Looks like Comcast in the Carmel NY District turned it on. My router picked up the primary and secondary DNS P6 addresses. They're routed back to Connecticut. System seems to be running fine.
the feed DNS servers are assigned via DHCPv6, that would be the best route. |
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| Thank you |
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