On 04/12/2018 08:39 PM, Paul Raines via FreeIPA-users wrote:
The problem is on this line in ipautil.CheckedIPAddress with the 
netmask=ifdata['netmask'] call

     ifnet = netaddr.IPNetwork('{addr}/{netmask}'.format(
           addr=ifaddr,
           netmask=ifdata['netmask']
           ))

On my CentOS 7.3 box which has python-netifaces-0.10.4-3.el7.x86_64 it works

On my CentOS 7.4 box where I am trying to install 
ipa-server-4.5.0-22.el7.centos.x86_64 and it has 
python2-netifaces-0.10.5-2.el7_4.x86_64 installed, it fails with:

ValueError: IPAddress() does not support netmasks or subnet prefixes! See 
documentation for details.

So I don't see how anyone has been able to install ipa-server on a RedHat 7.4 
or CentOS 7.4 box

Might be related to this:

https://bitbucket.org/al45tair/netifaces/issues/50/netmask-format-of-ipv6-address-is-not
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Hi,

this is a known issue, see #7021 ipa-server-install failure on checking matching interfaces - invalid format of netmas [1]. The fix was provided in FreeIPA 4.5.3, but I don't think it is available in CentOS.

HTH,
Flo

[1] https://pagure.io/freeipa/issue/7021
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