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Chapter 9: Problem 2

IPv 6 simplifies ARP out of existence by allowing hardware addresses to be part of the IPv6 address. How does this complicate the job of DNS? How does this affect the problem of finding your local DNS server?

Short Answer

Expert verified
IPv6 embedding hardware addresses complicates DNS by increasing address lengths and variability. Local DNS server discovery relies on protocols like DHCPv6 and Router Advertisements.

Step by step solution

01

Understand ARP and Hardware Addresses in IPv6

In IPv6, Address Resolution Protocol (ARP) is replaced by Neighbor Discovery Protocol (NDP). However, instead of dynamically mapping IP addresses to MAC addresses, IPv6 allows parts of a node's hardware (MAC) address to be embedded within its IPv6 address.
02

Analyze the Role of DNS in IPv6

DNS (Domain Name System) translates domain names to IP addresses so that browsers can load internet resources. With IPv6 embedding hardware addresses into IP addresses, DNS's job of translating names to these hardware-derived IPv6 addresses complicates due to the sheer length and number of potential addresses.
03

Address the Impact on Local DNS Server Discovery

The complication arises in finding local DNS servers as nodes might need to determine the local DNS server address autonomously. DHCPv6 or Router Advertisement messages in IPv6 can help nodes discover the local DNS server, but these protocols must support and handle the longer and potentially more dynamic IPv6 addresses.
04

Synthesize the Findings

Thus, embedding hardware addresses within IPv6 addresses adds complexity to DNS due to extended address length and potential address variability. It also impacts the initial setup procedures for finding local DNS servers but can be mediated through standard protocols like DHCPv6 and Router Advertisements.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Neighbor Discovery Protocol (NDP)
In IPv6, the Neighbor Discovery Protocol (NDP) plays a crucial role in the communication between devices on the same local network. NDP replaces the Address Resolution Protocol (ARP) used in IPv4. Rather than just mapping IP addresses to MAC addresses, it includes several essential functions, such as:

  • Address autoconfiguration: Allows devices to generate their own IP addresses automatically.
  • Router discovery: Determines the available routers on the network.
  • Neighbor reachability: Ensures that neighboring devices are still reachable.

By embedding parts of the MAC address directly into the IPv6 address, NDP simplifies communication. However, it makes DNS tasks more complex because DNS has to deal with much longer and more variable IPv6 addresses.
MAC addresses
MAC addresses are unique hardware identifiers assigned to network interfaces for communication on the physical network. In IPv6, portions of the MAC address can be embedded into the IPv6 address, specifically within the Interface Identifier.

This embedding, while beneficial for local communication, complicates DNS's job. DNS systems now need to handle these extended IPv6 addresses, which are not only longer but also potentially more dynamic due to changes in the network hardware. The MAC address-embedded IPv6 adds an extra layer of complexity in maintaining accurate and updated DNS records.
Domain Name System (DNS)
The Domain Name System (DNS) is vital for the internet. It translates easy-to-remember domain names into IP addresses, essential for locating network resources.

With IPv6 embedding MAC addresses into IP addresses, DNS faces challenges:

  • Address Length: IPv6 addresses are much longer, increasing the complexity in DNS resolution.
  • Variability: The dynamic nature of hardware addresses can lead to frequent changes in IPv6 addresses, complicating DNS updates.

This makes it harder for DNS to map domain names to these lengthy and fluid IPv6 addresses accurately.
DHCPv6
Dynamic Host Configuration Protocol for IPv6 (DHCPv6) is instrumental in automating IPv6 network configurations by providing IP addresses and other network details like DNS server addresses.

DHCPv6 helps address the challenge of finding local DNS servers in an IPv6 network. It can provide nodes with the information they need, despite the complexity and length of IPv6 addresses that may include parts of MAC addresses. In essence, DHCPv6 facilitates the initial network setup and configuration, streamlining access to local DNS resources.
Router Advertisements
Router Advertisements are a core part of NDP in IPv6 networks. Routers send these advertisements to inform nodes about important network parameters, including the presence of the router itself and related configurations like subnet prefixes.

Router Advertisements may also include DNS server information, aiding devices in discovering their local DNS servers. This is particularly useful in IPv6 environments, where address configurations can be complex and dynamic. With Router Advertisements, nodes can obtain necessary network details without manual configuration, smoothing over some of the complexities introduced by the inclusion of hardware-derived IPv6 addresses.

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Most popular questions from this chapter

Use the whois utility/service to find out who is in charge of your site, at least as far as the InterNIC is concerned. Look up your site both by DNS name and by IP network number; for the latter you may have to try an alternative whois server (e.g., whois -h whois.arin.net...). Try princeton.edu and cisco.com as well.

What problem would a DNS-based redirection mechanism encounter if it wants to select an appropriate server based on current load information?

RFC 1889 specifies that the time interval between receiver RTCP reports include a randomization factor to avoid having all the receivers send at the same time. If all the receivers sent in the same \(5 \%\) subinterval of their reply time interval, the arriving upstream RTCP traffic would rival the downstream RTP traffic. (a) Video receivers might reasonably wait to send their reports until the higherpriority task of processing and displaying one frame is completed; this might mean their RTCP transmissions were synchronized on frame boundaries. Is this likely to be a serious concern? (b) With 10 receivers, what is the probability of their all sending in one particular \(5 \%\) subinterval? (c) With 10 receivers, what is the probability half will send in one particular \(5 \%\) subinterval? Multiply this by 20 for an estimate of the probability half will all send in the same arbitrary \(5 \%\) subinterval. Hint: How many ways can we choose 5 receivers out of 10 ?

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