Internet ip address is internal modem address

hi!
first of all i apologize if i've overlooked a simular post and ask a previously discussed question again, but i couldn't find a clear answer.
i tried to setup dyndns on my wrt320n (fw: v1.0.03 build 010 Jul 24, 2009). after i created an acoount at dyndns and configured it on the router, i recognized that the internet ip address is the internal ip of my modem. so my dyndns address gets resolved to the internal ip of my modem. how can the router get the real external ip so dyndns is working correctly?
thx, kopi
Solved!
Go to Solution.

the modem my isp gave me is a fritz!box fon wlan 7140 sl
status:Firmware Version: v1.0.03 build 010Jul 24, 2009
Firmware Verification:     b719582d5f3e57c1f7932a15d20ff509
Current Time:     Mon, 01 Mar 2010 22:38:02
Internet MAC Address:     00:25:9C:47:EA:AF
Host Name:
Domain Name:
Internet Connection
Connection Type:     Automatic Configuration - DHCP
Internet IP Address:     192.168.0.21
Subnet Mask:     255.255.255.0
Default Gateway:     192.168.0.1
DNS1:     192.168.0.1
DNS2:
DNS3:
MTU:     1500
DHCP Lease Time:     10 Days
ipconfig response connected via wrt
Ethernet adapter Local Area Connection:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
   Physical Address. . . . . . . . . : 00-....
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::a445:c9c3:a583:8a74%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.100(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Monday, 01. March 2010 22:41:05
   Lease Expires . . . . . . . . . . : Tuesday, 02. March 2010 22:41:05
   Default Gateway . . . . . . . . . : 192.168.1.1
   DHCP Server . . . . . . . . . . . : 192.168.1.1
   DHCPv6 IAID . . . . . . . . . . . : 234890776
   DHCPv6 Client DUID. . . . . . . . : 00-....
   DNS Servers . . . . . . . . . . . : 192.168.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled
ipconfig response connected directly to modem
Ethernet adapter Local Area Connection:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller
   Physical Address. . . . . . . . . : 00-....
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::a445:c9c3:a583:8a74%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.101(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Monday, 01. March 2010 22:40:47
   Lease Expires . . . . . . . . . . : Tuesday, 02. March 2010 22:40:47
   Default Gateway . . . . . . . . . : 192.168.0.1
   DHCP Server . . . . . . . . . . . : 192.168.0.1
   DHCPv6 IAID . . . . . . . . . . . : 234888457
   DHCPv6 Client DUID. . . . . . . . : 00-....
   DNS Servers . . . . . . . . . . . : 192.168.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

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