November 2007
Beginner
642 pages
15h 43m
English
Content preview from Linux Networking CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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15.7. Calculating IPv6 Addresses
Problem
Calculating IPv4 addresses was enough fun, and now you have these gigantic IPv6 addresses to manage. Is there a tool like ipcalc to help you make sure you get your addressing right?
Solution
Yes, there is—ipv6calc. It's easy to use, as the following examples show.
This command analyzes whatever address you give it, both IPv4 and IPv6:
$ ipv6calc --showinfo -m FC00:0:0:1::
No input type specified, try autodetection...found type: ipv6addr
No output type specified, try autodetection...found type: ipv6addr
IPV6=fc00:0000:0000:0001:0000:0000:0000:0000
TYPE=unicast,unique-local-unicast
SLA=0001
IPV6_REGISTRY=reserved
IID=0000:0000:0000:0000
EUI64_SCOPE=localThis example compresses an IPv6 address:
$ ipv6calc --addr_to_compressed fc00:0000:0000:0001:0000:0000:0000:0000
fc00:0:0:1::This example partly uncompresses an IPv6 address:
$ ipv6calc --addr_to_uncompressed fc00:0:0:1::
fc00:0:0:1:0:0:0:0This example spells it out completely:
$ ipv6calc --addr_to_fulluncompressed fc00:0:0:1::
fc00:0000:0000:0001:0000:0000:0000:0000ipv6calc will figure out your DNS PTR records for you, so you can copy-and-paste them into your BIND zone files:
$ ipv6calc --out revnibbles.arpa fc00:0:0:1::
No input type specified, try autodetection...found type: ipv6addr
0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0.0.c.f.ip6.arpa.You can convert IPv6 prefixes to IPv4, and the reverse:
$ ipv6calc -q --action conv6to4 --in ipv4 192.168.1.10 --out ipv6 2002:c0a8:10a:: ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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