Is this a valid IPv6 address and can you help me convert it?

gigatexal

I'm here to learn
Nov 25, 2012
2,862
575
113
Portland, Oregon
alexandarnarayan.com
so I am leaving to see the in laws for 3 weeks and forgot to grab my public ip so I could connect to my home network. I know, Noob mistake.

Calling Comcast they apparently think my IPv6 address of my modem is this: (it’s not one of those backdoor black box monolith modem gateway shitstorms, it’s just a dumb Motorola cable modem hence why they can’t get info on it)

2001:0558:4060:005c:223d:66ff:fe9c:9a4d

But I can’t make heads or tails of it
 

nkw

Active Member
Aug 28, 2017
130
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Code:
10  be-10847-cr01.seattle.wa.ibone.comcast.net (2001:558:0:f5b8::1)  96.189 ms hu-0-3-0-7-cr01.9greatoaks.ca.ibone.comcast.net (2001:558:0:f8e2::1)  112.648 ms *
11  * ae-72-ar01.troutdale.or.bverton.comcast.net (2001:558:0:f736::2)  93.702 ms *
12  ae-72-ar01.beaverton.or.bverton.comcast.net (2001:558:0:f733::2)  106.460 ms ae-52-sur04.troutdale.or.bverton.comcast.net (2001:558:f0:14a::2)  100.753 ms  101.211 ms
13  ae-52-sur03.troutdale.or.bverton.comcast.net (2001:558:f0:78::2)  111.753 ms po-2-1-cbr01.troutdale.or.bverton.comcast.net (2001:558:f2:20bf::2)  99.560 ms ae-52-sur03.troutdale.or.bverton.comcast.net (2001:558:f0:78::2)  112.184 ms
14  po-2-1-cbr01.troutdale.or.bverton.comcast.net (2001:558:f2:20bf::2)  96.048 ms !X  97.428 ms !X po-1-1-cbr01.troutdale.or.bverton.comcast.net (2001:558:f2:127::2)  106.785 ms
Looks like a valid Comcast IPv6 address maybe somewhere around Oregon? Doesn't respond to pings but that is as far as my traceroute went.
 
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Pri

Active Member
Jul 30, 2014
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"asn": "AS7922",
"provider": "COMCAST-7922 - Comcast Cable Communications, LLC, US",
"country": "United States",
"ip": "2001:0558:4060:005c:223d:66ff:fe9c:9a4d",
 
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LukeP

Member
Feb 12, 2017
183
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How to Translate Teredo IPv6 addresses
  • First 32 bits: 2001:0000 (fixed Teredo prefix)
  • Second 32 bits: IPv4 address of the server
  • 16 Bits of Flags (determining what kind of NAT is in use)
  • 16 Bits for UDP port used (obfuscated)
  • last 32 Bits: public IPv4 address of the client
i had a look and couldnt find any oregon ip so not sure the problem. never tried it before.
 
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mstone

Active Member
Mar 11, 2015
505
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You can go to IPv6 from IPv4 but not the other way around? Dang. Thanks everyone.
You can do neither in the general case. There are ways to convert an ipv4 to specific types of ipv6 (and back) in order to tunnel it over a pure ipv6 network, but that's only a transition mechanism and not a general property of ipv6.
 
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acquacow

Well-Known Member
Feb 15, 2017
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Gotta run your own DNS services man... or have a synology nas on your network and have it use synology's free dns service.
 

mstone

Active Member
Mar 11, 2015
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Gotta run your own DNS services man... or have a synology nas on your network and have it use synology's free dns service.
Or just use a dynamic dns service, they're fairly commodity. Linksys even bundles support for a couple into their consumer routers, IIRC.
 

mstone

Active Member
Mar 11, 2015
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Perhaps this can serve as a wake up call that it's far past time for technologists and network admins to understand and implement IPv6.
I'm not sure that IPv6 is particularly relevant to the problem at hand--it just happens to be a comcast fail that for some random reason they can figure out a customer's IPv6 and not the customer's IPv4. I'd chalk that up to clueless/disempowered tech support person as much as anything else.