Connecting Cisco 831 Router behind the D-Link Router

Hi!
My home network uses D-Link Router providing 192.168.1.x addrress throughout
our home network. When I connect Cisco 831 Router so that I can be be part
of our office VPN network, My D-Link address scheme changes to 10.10.x.x.
I'm not sure why it is doing that.

My Cisco 831 router is sitting behind D-Link router. The following may
illustarte the setup:

Cable Modem----DHCP------->WAN Port on D-Link--------->One of the LAN
Ports-------192.168.1.x----->Cisco Router

The Cisco Router does see the 192.168.1.x adress provided by D-Link.

However, when I disconnect Cisco Router LAN Cable from the D-Link router, I
am back to 192.168.1.x address throught my home network and obviously
everything works fine.

Can one explain the possible cause of this and what should I set/check to
solve this issue.
yaj


.

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