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From "Jerome Boulon (JIRA)" <>
Subject [jira] Commented: (CHUKWA-412) check for IPv6 compatibility
Date Mon, 09 Nov 2009 20:05:32 GMT


Jerome Boulon commented on CHUKWA-412:

>From Wikipedia:
IPv6 addresses are 128 bits in length and are normally written with hexadecimal digits and
colon separators like 2001:db8:85a3::8a2e:370:7334, as opposed to the dot-decimal notation
of the 32 bit IPv4 addresses. IPv6 addresses are typically composed of two logical parts:
a 64-bit (sub-)network prefix, and a 64-bit host part.

IPv4-mapped addresses
Dual stack IPv6/IPv4 implementations typically support a special class of addresses, the IPv4-mapped
addresses. This address type has its first 80 bits set to zero and the next 16 set to one
while its last 32 bits represent an IPv4 address. These addresses are commonly represented
with their last 32 bits written in the customary dot-decimal notation of IPv4; for example,
::ffff: is the IPv4-mapped IPv6 address for IPv4 address

> check for IPv6 compatibility
> ----------------------------
>                 Key: CHUKWA-412
>                 URL:
>             Project: Hadoop Chukwa
>          Issue Type: Task
>            Reporter: Ari Rabkin
>            Priority: Minor
> We should test on an IPv6-only cluster and verify that nothing breaks. I'm worried about
demux parsers in particular, but there may be other issues elsewhere.

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