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Add CG-NAT range to non-globally routed IP space per RFC7793

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The Shared address space (100.64.0.0/10) used by CG-NAT, defined in RFC6598 should
not have reverse DNS queries sent to global DNS infrastructure.

Confirmed in RFC7793 and listed on
https://www.iana.org/assignments/locally-served-dns-zones/locally-served-dns-zones.xhtml

Signed-off-by: Rob Gill <rrobgill@protonmail.com>
This commit is contained in:
Rob Gill via Dnsmasq-discuss
2025-06-24 22:16:04 +00:00
committed by Simon Kelley
parent 57e582492b
commit c70b92b2a4
1 changed files with 1 additions and 0 deletions
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1
src/rfc1035.c
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@@ -415,6 +415,7 @@ int private_net(struct in_addr addr, int ban_localhost)
(((ip_addr & 0xFF000000) == 0x7F000000) && ban_localhost) /* 127.0.0.0/8 (loopback) */ ||
(((ip_addr & 0xFF000000) == 0x00000000) && ban_localhost) /* RFC 5735 section 3. "here" network */ ||
((ip_addr & 0xFF000000) == 0x0A000000) /* 10.0.0.0/8 (private) */ ||
((ip_addr & 0xFFC00000) == 0x64400000) /* 100.64.0.0/10 (CG-NAT) RFC6598/RFC7793*/ ||
((ip_addr & 0xFFF00000) == 0xAC100000) /* 172.16.0.0/12 (private) */ ||
((ip_addr & 0xFFFF0000) == 0xC0A80000) /* 192.168.0.0/16 (private) */ ||
((ip_addr & 0xFFFF0000) == 0xA9FE0000) /* 169.254.0.0/16 (zeroconf) */ ||