Issues with DMVPN en EIGRP routing

Hi all,

I have a main and branch office connected to the Internet. The main office is equiped with a Cisco 1812 router and the branch office is connected with a Cisco 871.

The 1812 is acting as a hub in the DMVPN and the 871 as a spoke. EIGRP is used as the routing protocol.

The IP configuration is as follows:

Main office
- Private IP address: 192.168.1.30 in range: 192.168.1.0/24
- mGRE endpoint VPN tunnel: 172.16.1.1/16
- NAT disabled

Branch office:
- Private IP address: 192.168.0.1 in range: 192.168.0.0/24
- mGRE endpoint VPN tunnel: 172.16.2.1/16
- NAT enabled

From the main office router I can ping the private IP address of the router in the branch office. From my workstation (IP: 192.168.1.80) at the main office I can ping the private IP address of the branch office router as well.

Trace route output:

[code:1]C:\Documents and Settings\admin>tracert 192.168.0.1

Tracing route to 192.168.0.1 over a maximum of 30 hops

1 <1 ms <1 ms <1 ms 192.168.1.30
2 12 ms 13 ms 15 ms 192.168.0.1

Trace complete.[/code:1]

From the branch office router I can ping both the main office router and my workstation.

However, when I try to ping other clients at the branch office the ping fails. A trace route shows the following:

[code:1]C:\Documents and Settings\admin>tracert 192.168.0.254

Tracing route to 192.168.0.254 over a maximum of 30 hops

1 <1 ms <1 ms <1 ms 192.168.1.30
2 14 ms 18 ms 17 ms 172.16.2.1
3 14 ms * 17 ms 172.16.2.1
4 * * * Request timed out.
5 * * * Request timed out.
6 ^C[/code:1]

Does anyone have a clue about what's going on? Thanks in advance!