Public bug reported:
Ubuntu 18.04.5 LTS
apache2 2.4.29-1ubuntu4.14
A IPv4 client accesses an Apache2 server configured with proxypass to a
IPv6 capable backend. X-Forwarded-For header with the IPv4 is not passed
to the backend. Work around is to force IPv4 with ProxySourceAddress
<IPv4-address>. Expected behaviour is that it would pass the client's
IPv4 without the work around. Even though the Proxy backend connection
is IPv6, this does not mean that the X-Forwarded-For header becomes
null. Documentation highlighted statement seems to underline this:
"IPv4-over-IPv6 Mapped Addresses
As with httpd in general, any IPv4-over-IPv6 mapped addresses are recorded in
their IPv4 representation"
** Affects: apache2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1895877
Title:
proxypass IPv4-over-IPv6 excludes X-Forwarded-For header
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