Mobile Remote Access (DNS entries)

When configuring MRA most conmanly asked question ,”what entries we need on DNS”. Below example i use Dual nic configuration with Dual Domain(internal and external different domain)

Infrastructure details

Domains:-

  • Internal Domain:- abc.local
  • External Domain:- abc.com

Server:-

  • CUCM IP addresses:- 192.168.10.10 HostName :- cucm.abc.local
  • IM Presence address:- 192.168.10.11 HostName :- im.abc.local
  • Expressway C address :- 192.168.10.12 HostName :- express-c.abc.local
  • Expressway Internal NIC :- 192.168.10.13 HostName :-
  • Expressway DMZ NIC address :- 192.168.20.13 HostName :- express-e.abc.com
  • Expressway public IP:- 168.10.20.54

Internal DNS Entries

A-record(Forward and Reverse):-

======================================================

Domain:- abc.local
cucm.abc.local 192.168.10.10
im.abc.local 192.168.10.11
express-c.abc.local 192.168.10.12

Domain :- Create a subzone abc.com

express-e.abc.com 192.168.10.13(Internal NIC IP)

======================================================

Srv-Record

New versions of Expressway doesn’t need _cisco-uds for C to discover CUCM.But required when jabber user logins internally.

======================================================
_cisco-uds._tcp.abc.local SRV service location:
priority = 6
weight = 30
port = 8443

svr hostname = cucm3.example.com

======================================================

Public DNS:-

A-record :-

======================================================

Domain:- abc.com

express-e.abc.com 168.10.20.54

======================================================

Srv-Record

======================================================
_collab-edge._tls.abc.com SRV service location:
priority = 3
weight = 7
port = 8443

svr hostname = express-e.abc.com

======================================================

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