86 votes
Accepted

Is "IPv10" a joke or a serious RFC draft?

As Ron said, anyone can write a proposal. I have a hard time taking proposals seriously from someone who suggests interconnecting satellites with optical fiber, though. Also, I can't imagine this ...
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  • 15.7k
27 votes

Is "IPv10" a joke or a serious RFC draft?

You must remember that anyone can submit proposals to the IETF, and they are taken seriously, until they are either adopted or die due to lack of interest. This particular proposal has expired and ...
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  • 94.1k
19 votes

Is "IPv10" a joke or a serious RFC draft?

Is “IPv10” a joke or a serious RFC draft? Both. That draft doesn't solve a single problem but opens a can of new ones. I guess that bloke is serious and he doesn't get what ridiculous schemes he's ...
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  • 71.6k
12 votes
Accepted

How is NAT a hack?

Before NAT every device connected to the internet had its own IP address. That was how the internet was designed. This gives you great flexibility and visibility. If you have a firewall then it can ...
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6 votes

How is NAT a hack?

I've been told that this was a hack; simply because the Internet was running out of ipv4 addresses. That's correct. The original concept of IPv4 was to provide end-to-end connectivity so that each ...
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5 votes
Accepted

What are the correct protocol versions (v4 vs v6) for packets inside DS-Lite tunnels?

The consensus of the comments is The segments are inside IPv4 The protocol of TCP happens to be 6 and it's not its IP version number As you say, if you're looking for 4s vs 6s for protocol versions, ...
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  • 15.9k
5 votes
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How does computer in IPv4 network communicate with computer in IPv6 network

IPv4 and IPv6 are two completely separate protocols, with separate, incompatible packet headers and addressing, and an IPv4-only host cannot directly communicate with an IPv6-only host. The correct ...
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  • 94.1k
4 votes

Since we ran out of IPv4 now, what does it mean for consumers?

ARIN ran out of IPv4 addresses to supply to the carriers. There is a market for blocks of IPv4 addresses, but it is supply and demand driven. Since the supply is dwindling, and demand is unabated, ...
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  • 94.1k
4 votes

How is NAT a hack?

Network Address Translation (NAT) and Port Address Translation (PAT) have been widely deployed since the early days of the Web. It may be misleading to characterize NAT/PAT as a hack. Restoring end-...
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4 votes
Accepted

IPv4 to IPv6 one-to-one mapping for a whole Class A range

First IPv4 network classes are dead, killed in 1993 by RFCs 1518 and 1519, which defined CIDR (Classless Inter-Domain Routing). Modern networking doesn't use network classes, and it has not for many ...
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  • 94.1k
4 votes
Accepted

Is it possible to see a Teredo IPv6 address in IPv6 neighbor cache?

You won't see Teredo addresses in the neighbor cache, because Teredo creates a virtual point to point link and therefore has no neighbors. A neighbor is another device (which, for this purpose, speaks ...
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4 votes

Security implications of IPv6 tunneling over IPv4

I've read that IPv6 over IPv4 tunnels are a security risk because IPv6 traffic cannot be intercepted by Intrusion Detection Systems and Firewalls. That's completely untrue. Maybe some specific, very ...
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  • 15.7k
4 votes
Accepted

What "IVI" from "IVI Translation" stands for?

This document presents the CERNET IVI translation design and deployment for the IPv4/IPv6 coexistence and transition. In Roman numerals, the "IV" stands for 4, and "VI" stands for ...
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  • 29.7k
4 votes
Accepted

Understand DSCP and Precedence Values in Ipv4 or Ipv6 packet

The IPv4 DSCP (IPv6 Traffic Flow) packet header field can be used to mark packets for later treatment in network congestion. There are recommendations and guidelines for interpreting these values a ...
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  • 94.1k
3 votes
Accepted

IPv4 only host on a dual stack environment

Dual-stacked hosts can easily get to either IPv4 or IPv6 devices. You need to make sure that DNS is correctly set up. Such a host will probably default to IPv6 if there is a AAAA record, so you do not ...
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  • 94.1k
3 votes

Security implications of IPv6 tunneling over IPv4

There are a few tunneling protocols, but I'm guessing you're talking about these: (1) 6to4 tunnels, which are trivially stopped by firewalls, as they are clearly marked as IPv4 protocol 41. (2) teredo ...
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  • 131
3 votes
Accepted

Translation from unique local to global unicast address

There's a multitude of IPv4-to-IPv6 transitioning mechanisms - for an overview check WP:IPv6 transition mechanism. IPv6 is normally deployed (and should be) with local and public IP addresses ...
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  • 71.6k
3 votes

What are the correct protocol versions (v4 vs v6) for packets inside DS-Lite tunnels?

Turns out, Wireshark confirms what our engine said - that the packet inside IPv4 layer is indeed TCPv6. As jonathanjo already wrote: The (6) is the IPv4 (!) protocol number which is 6 for TCP and 17 ...
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3 votes

How does computer in IPv4 network communicate with computer in IPv6 network

Welcome to the messy world of the IPv6 transition. IPv4 and IPv6 are two seperate protocols that do not directly interoperate. The IPv6 proponents idea was that we would all move to dual stack, ...
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  • 11.7k
3 votes
Accepted

Will home networks migrate to ipv6?

Home networks and mobile devices are usually the first to get IPv6. This is because the devices running those networks are often provided and managed by the ISP. ISPs use lots of IPv4 addresses so ...
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3 votes

IPv6 Subnetworks Explanation

Maybe the simplest one: Is a v6 address static? Or can I make it static like a v4 one so that I can reach my printer at home for example? IPv6 addresses like ipv4 ones can be either dynamic or static....
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  • 11.7k
2 votes

Since we ran out of IPv4 now, what does it mean for consumers?

For most people, this means nothing. Telcos still have alot of addresses (used, some even unused). What happens, depends on the country and telco. Most probably outcome is, that the cheapest internet ...
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  • 1,924
2 votes

Transmission of Data

Baseband refers to a transmission which uses all the bandwidth of a medium (encoded directly on the wire), while broadband means that a transmission only uses part of the bandwidth of a medium (...
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  • 94.1k
2 votes

Is it possible to see a Teredo IPv6 address in IPv6 neighbor cache?

If you are seeing teredo addresses in a neigbour cache then something is seriously misconfigured. Teredo creates a virtual interface on the teredo client allowing it to communicate with other teredo ...
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  • 11.7k
2 votes
Accepted

Benefits for adopting ipv6 internally?

What is the current status of ipv6 adoption in terms of usefulness? Google maintains an IPv6 adoption page, and there is a per country adoption tab. Specifically, if I have a network of ...
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  • 94.1k
2 votes
Accepted

Error in IPv4-to-IPv6 mapping of Google IT Support Professional online course?

Google's course is wrong. As you correctly discovered, IPv4 address 192.168.1.1 does not map to the IPv6 address 0:0:0:0:0:ffff:d1ad:35a7. That said, it's possible that you will be marked "wrong&...
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1 vote
Accepted

ISATAP configuration not working when adding hosts

solved, Problem was not enabling ipv6 unicast routing. this can be done by using: ipv6 unicast-routing.
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  • 121
1 vote

Is "IPv10" a joke or a serious RFC draft?

It's a serious attempt to solve a real problem. Whether the solution is good or bad (it's probably rubbish), its problem statement is correct: the current strategy of trying to implement IPv6 has so ...
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1 vote

What does the Flow mean?

A flow is usually a sequence of packets belonging together in some way. In IPv6 each packet has a flow label field that the sender can set to signal which packets belong together.
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