https://issues.apache.org/bugzilla/show_bug.cgi?id=55098
Bug ID: 55098
Summary: does not listen to IP4 when IP6 wildcard address is
used on host where IP6 is not bridged to IP4
Product: Apache httpd-2
Version: 2.4.4
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: Core
Assignee: [email protected]
Reporter: [email protected]
Specifying a "Listen" directive which results in binding to the IPV6 wild card
address will cause Apache HTTPD to not bind to the IPV4 address. On hosts where
IPV6 data is not routed to corresponding IPV4 ports, this causes HTTPD to be
unreachable by IPV4.
When the IPV4 address is the wild card address, no error is emitted and the
server runs.
When the IPV4 address is a specific address, an error is emitted and the server
ends without fully starting service. The latter address is excluded by the
former.
An example error message is:
(98)Address already in use: AH00072: make_sock: could not bind to address
127.0.0.1:80
no listening sockets available, shutting down
An example combination of directives causing that error is
Listen [::]:80
Listen 127.0.0.1:80
An example combination of directives for the wild card addresses is
Listen 0.0.0.0:80
Listen [::]:80
On Linux, setting
sysctl net.ipv6.bindv6only=1
causes the IPV6 and IPV4 protocols not to be bridged.
net.ipv6.bindv6only=0
, which is the default, causes them to be bridged.
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