DHCP / NAT / Dyn DNS / SIP Configuration

[guillermoandres]

Hi All. I need some help with some configurations. Excuse me for my bad English.

So I have this configuration in my lab:


--------- ------ -------- -----------------
SIP phone|<-->|Router|<-->|Internet|<-->|ADSL Modem/Router| <-->
--------- ------ -------- -----------------

------ ------------ ------- ---------
<-->|Switch|<-->|Router CISCO|<-->|SIP PBX|<-->|SIP phone|
------ ------------ ------- ---------

I configured the ADSL Modem as a Router, and now it is providing public IP addresses to the switch with DHCP.

This is what I need:

1) Configure the Interface Ethernet 0 from the Cisco Router to get a public IP address via DHCP. (one provided by the modem/router)

2) Configure the Cisco Router to forward UDP port 5060 to the private PBX IP address (10.0.0.12) via Interface Eth1

3) Configure the Cisco Router to forward UDP port range 8000-30000 to the private PBX IP address via Interface Eth1

4) Configure ddns in eth0 provided by dyndns.org, so the remote sip phone points to a domain name rather to a public IP.


It's possible to complete all this configurations????

I have been doing some research and found that with a combination of ip static nat and access lists its possible to forward ports. Nevertheless I have not found a good example ...

Thank you all in advance.