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commit: e5c3bb95ed454a270cf1796bc123fb0c8f34ab5a |
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Author: Kerin Millar <kfm <AT> plushkava <DOT> net> |
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AuthorDate: Wed Jan 27 16:25:05 2021 +0000 |
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Commit: Lars Wendler <polynomial-c <AT> gentoo <DOT> org> |
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CommitDate: Wed Jan 27 16:55:21 2021 +0000 |
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URL: https://gitweb.gentoo.org/proj/netifrc.git/commit/?id=e5c3bb95 |
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|
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net/apipa.sh: Account for the first and last /24 being reserved |
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|
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While the 169.254/16 prefix is used to define IPv4 link-local addresses, |
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RFC 3927 states that the first 256 and last 256 addresses are reserved for |
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future use. Therefore, the number of available addresses amounts to neither |
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64516 nor 65534, but actually 65024. |
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|
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Signed-off-by: Kerin Millar <kfm <AT> plushkava.net> |
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Signed-off-by: Lars Wendler <polynomial-c <AT> gentoo.org> |
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|
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net/apipa.sh | 6 +++--- |
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1 file changed, 3 insertions(+), 3 deletions(-) |
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|
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diff --git a/net/apipa.sh b/net/apipa.sh |
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index f3ec534..41274fa 100644 |
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--- a/net/apipa.sh |
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+++ b/net/apipa.sh |
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@@ -36,11 +36,11 @@ _random_apipa_octets() |
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seed=$(_random_bytes_as_int 2) |
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|
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# For APIPA (RFC 3927), the 169.254.0.0/16 address block is |
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- # reserved. This provides 65534 addresses, having accounted for the |
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- # network and broadcast address. Note that we must count from 1. |
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+ # reserved. This provides 65024 addresses, having accounted for the |
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+ # fact that the first and last /24 are reserved for future use. |
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awk "BEGIN { |
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srand($seed) |
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- for (i=1; i<65535; i++) print rand() \" \" i |
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+ for (i=256; i<65280; i++) print rand() \" \" i |
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}" | |
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sort -k 1,1 -n | |
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POSIXLY_CORRECT=1 awk '{ |
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