https://bz.apache.org/bugzilla/show_bug.cgi?id=69672
Bug ID: 69672
Summary: mod_remoteip rejecting valid IPv4-mapped IPv6
addresses
Product: Apache httpd-2
Version: 2.4.63
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_remoteip
Assignee: bugs@httpd.apache.org
Reporter: bjo...@j3e.de
Target Milestone: ---
I'm having a haproxy, which uses the proxy protocol to report the client IP
addresses to the backend server, which is Apache with mod_remoteip and
"RemoteIPProxyProtocol on". IPv4 connections are by default and intentionally
IPv4-mapped IPv6 addresses. mod_remoteip however refuses those IPs and all
those connections fail:
[Tue May 06 00:22:55.500263 2025] [remoteip:error] [pid 93692:tid 93709]
[client 192.168.4.1:36328] AH03500: RemoteIPProxyProtocol: invalid
client-address '::ffff:123.168.1.123' found in header 'PROXY TCP6
::ffff:123.168.110.148 ::ffff:99.243.150.199 31875 443'
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