You are an administrator for the local DNS server for your company, and you have
ID: 3687189 • Letter: Y
Question
You are an administrator for the local DNS server for your company, and you have been tasked with manually adding the IPv6 reverse mapping zones for your company’s domain to the server’ s config file. The IPv4 domain name for your company’s Web site is abcxyz.com, and the IPv6 domain name is abcxyz-v6.com. You must know the IPv4 and IPv6 addresses for your company’s domain and any subdomains, such as marketing.abcxyz.com and marketing.abcxyz-v6.com or sales.abcxyz.com andsales.abcxyz-v6.com, so you can configure the corresponding A and AAAA records as well as the ip6.arpa reverse mapping zone names for each IPv6 address. Determine where you would find this data, and then, once you have gathered that information, construct the beginning of an IPv6 reverse mapping zone based on that information. Use the $ORIGINcontrol statement and the following format:
$ORIGIN ip6.arpa name
PTR record
PTR record
Explanation / Answer
If you use the standard IPv6 subnetting scheme shown in the diagram in “The ABCs of IPv6 Addresses”, the reverse-mapping zones that correspond to your subnets will have 18 labels. For example, the subnet that suckerpunch.v6.movie.edu is on, 2001:db8:cafe:f9::/64, would correspond to the reverse-mapping zone 9.f.0.0.e.f.a.c. 8.b.d.0.1.0.0.2.ip6.arpa. Remember that DNS is case-insensitive, so we could also have called the zone 9.F.0.0.E.F.A.C.8.B.D.0.1.0.0.2.IP6.ARPA or even 9.F.0.0.e.F.a.C. 8.b.D.0.1.0.0.2.iP6.aRpA, if we’d been feeling punchy. They all would have handled reverse mapping of IPv6 addresses just as well. As with IPv4 reverse-mapping zones, IPv6 reverse-mapping zones mostly contain PTR records. And as with any zone, they must contain one SOA record and one or more NS records. Here’s what the beginning of that zone looks like: $TTL 1d @ IN SOA terminator.movie.edu. hostmaster.movie.edu. ( 2011030800 ; Serial number 1h ; Refresh (1 hour) 15m ; Retry (15 minutes) 30d ; Expire (30 days) 10m ) ; Negative-caching TTL (10 minutes) IN NS terminator.movie.edu. IN NS wormhole.movie.edu. 3.d.0.0.0.0.0.0.0.0.0.0.0.0.0.0 PTR suckerpunch.v6.movie.edu. 4.d.0.0.0.0.0.0.0.0.0.0.0.0.0.0 PTR super8.v6.movie.edu. Here’s hoping that most of your hosts will use dynamic update to
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.