File "/usr/lib/python2.7/site-packages/ipaserver/install/server/install.py", line 611, in install_check
    dns.install_check(False, api, False, options, host_name)
  File "/usr/lib/python2.7/site-packages/ipaserver/install/dns.py", line 269, in install_check
    util.no_matching_interface_for_ip_address_warning(ip_addresses)
  File "/usr/lib/python2.7/site-packages/ipalib/util.py", line 1135, in no_matching_interface_for_ip_address_warning
    if not ip.get_matching_interface():
  File "/usr/lib/python2.7/site-packages/ipapython/ipautil.py", line 217, in get_matching_interface
    netmask=ifdata['netmask']
  File "/usr/lib/python2.7/site-packages/netaddr/ip/__init__.py", line 933, in __init__
    implicit_prefix, flags)
  File "/usr/lib/python2.7/site-packages/netaddr/ip/__init__.py", line 810, in parse_ip_network
    mask = IPAddress(val2, module.version, flags=INET_PTON)
  File "/usr/lib/python2.7/site-packages/netaddr/ip/__init__.py", line 280, in __init__
    % self.__class__.__name__)

2017-06-16T07:36:25Z DEBUG The ipa-server-install command failed, exception: ValueError: IPAddress() does not support netmasks or subnet prefixes! See documentation for details.
2017-06-16T07:36:25Z ERROR IPAddress() does not support netmasks or subnet prefixes! See documentation for details.
2017-06-16T07:36:25Z ERROR The ipa-server-install command failed. See /var/log/ipaserver-install.log for more information

diff --git a/ipapython/ipautil.py b/ipapython/ipautil.py
index a277ed8..2e3da15 100644
--- a/ipapython/ipautil.py
+++ b/ipapython/ipautil.py
@@ -205,17 +205,23 @@ class CheckedIPAddress(UnsafeIPAddress):
             )

         iface = None
+        root_logger.debug('Checking network interfaces')
         for interface in netifaces.interfaces():
             for ifdata in netifaces.ifaddresses(interface).get(family, []):
-
+                root_logger.debug(ifdata['addr'])
                 # link-local addresses contain '%suffix' that causes parse
                 # errors in IPNetwork
                 ifaddr = ifdata['addr'].split(u'%', 1)[0]

-                ifnet = netaddr.IPNetwork('{addr}/{netmask}'.format(
+                root_logger.debug(ifdata['netmask'])
+                netmask = ifdata['netmask'].split(u"/")[-1]
+
+                network = '{addr}/{netmask}'.format(
                     addr=ifaddr,
-                    netmask=ifdata['netmask']
-                ))
+                    netmask=netmask
+                )
+                root_logger.debug(network)
+                ifnet = netaddr.IPNetwork(network)
                 if ifnet == self._net or (
                                 self._net is None and ifnet.ip == self):
                     self._net = ifnet

$ rpm -q python2-netifaces python-netaddr
python2-netifaces-0.10.5-5.fc26.x86_64
python-netaddr-0.7.19-2.fc26.noarch