I have setup an Idm environment with replica and AD trust. I have the following 
realms and domains:

IPADEV.EXAMPLE.LOCAL is the IPA realm with the domain ipadev.example.local
EXAMPLE.LOCAL is the AD realm with dns domain example.local

All the clients have the DNS domain example.local and are/will be enrolled to 
the IPA domain. 

In the IPA servers I had  the following entries (added by the installation 
process)  in /etc/krb5.conf : 
server
=====
[domain_realm]
 .ipadev.example.local = IPADEV.EXAMPLE.LOCAL
 ipadev.example.local = IPADEV.EXAMPLE.LOCAL
 ipadev04.example.local = IPADEV.EXAMPLE.LOCAL
 .example.local = IPADEV.EXAMPLE.LOCAL
 example.local = IPADEV.EXAMPLE.LOCAL
 .example.local = IPADEV.EXAMPLE.LOCAL
 example.local = IPADEV.EXAMPLE.LOCAL

client
====
[domain_realm]
  .ipadev.example.local = IPADEV.EXAMPLE.LOCAL
  ipadev.example.local = IPADEV.EXAMPLE.LOCAL
  ipadev02.example.local = IPADEV.EXAMPLE.LOCAL
  .example.local = IPADEV.EXAMPLE.LOCAL
  example.local = IPADEV.EXAMPLE.LOCAL

Because of various issues (either replication did not work, either clients 
could not query AD), I had removed entries on the server config (at some point 
i had .example.local = EXAMPLE.LOCAL but that broke the replication between ipa 
servers ) and now it looks like that: 

[domain_realm]
 .ipadev.example.local = IPADEV.EXAMPLE.LOCAL
 ipadev.example.local = IPADEV.EXAMPLE.LOCAL
 ipadev04.example.local = IPADEV.EXAMPLE.LOCAL

My question is , how should the [domain_realm] section of the /etc/krb5.conf  
look like on  both ipa server and ipa client   ? 
Is  dns_lookup_realm = true and dns_lookup_kdc = true enough in the 
[libdefaults] section or should these realm be explicitly added ? What are the 
tradeoffs of not using them ? 
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