Specify how Postfix should find the local network interfaces.
Postfix needs this information to avoid mailer loops and to find out
if mail for user@[ipaddress] is a local or remote destination.
If your system has the getifaddrs() routine then add
the following to your platform-specific section in
src/util/sys_defs.h:
#ifndef NO_IPV6
# define HAS_IPV6
# define HAVE_GETIFADDRS
#endif
Otherwise, if your system has the SIOCGLIF ioctl()
command in /usr/include/*/*.h, add the following to your
platform-specific section in src/util/sys_defs.h:
#ifndef NO_IPV6
# define HAS_IPV6
# define HAS_SIOCGLIF
#endif
Otherwise, Postfix will have to use the old SIOCGIF commands
and get along with reduced IPv6 functionality (it won't be able to
figure out your IPv6 netmasks, which are needed for "
mynetworks_style
= subnet". Add this to your platform-specific section in
src/util/sys_defs.h:
#ifndef NO_IPV6
# define HAS_IPV6
#endif
Test if Postfix can figure out its interface information.
After compiling Postfix in the usual manner, step into the
src/util directory and type "make inet_addr_local".
Running this file by hand should produce all the interface addresses
and network masks, for example:
% make
% cd src/util
% make inet_addr_local
[... some messages ...]
% ./inet_addr_local
[... some messages ...]
./inet_addr_local: inet_addr_local: configured 2 IPv4 addresses
./inet_addr_local: inet_addr_local: configured 4 IPv6 addresses
168.100.189.2/255.255.255.224
127.0.0.1/255.0.0.0
fe80:1::2d0:b7ff:fe88:2ca7/ffff:ffff:ffff:ffff::
2001:240:587:0:2d0:b7ff:fe88:2ca7/ffff:ffff:ffff:ffff::
fe80:5::1/ffff:ffff:ffff:ffff::
::1/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
The above is for an old FreeBSD machine. Other systems produce
slightly different results, but you get the idea.
