LINKSYS VPN Client and RV016 Router connection issue

I have a LINKSYS RV016 in my office which the subnet is 192.168.30.x. I have connected with that router two remote offices ( gateway to gateway ) and those connections are working good. The problem is when I try to connect from home where I have a Microsoft MN-700 router and subnet 192.168.60.x using the LINKSYS VPN client: I get a message from the client software that says "Verifiyng the Network" for a few minutes -  No resources can be accessed on the office network - and then I'm disconnected. But if I connect  the home ADSL modem directly to my computer I can connect to the office ( RV016 ) and see all resources on the company network. So I'm thinking that the problem resides on my home MN-700 router but I cannot see where exactly. I've tried also to do the same thing using another router in home ( Linksys WRT54GS ) and got same problem. Does anyone know how could I fix the problem ?

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Rob WilliamsCommented:
Good chance GRE protocol is being blocked at the home site. In your situation this could be caused by 2 things.
1) The router is blocking GRE. On the WRT54GS you need to enable, by choosing "enable PPTP Pass-through" on the security tab of the router's web based management console. The MN-700 may have a similar setting PPTP pass-through, VPN pass-through, or GRE pass-through, or it may not support VPN traffic at all. Some routers don't and I couldn't find out on this unit.
2) Does your modem perform NAT (Network Address Translation)? Some modems are a combined modem and router. If so they perform NAT as does your router. VPN's as a rule do not like dual NAT devices. To get around this the modem needs to be put in bridge mode. To tell if your modem performs NAT: most NAT modems have multiple network outlets, also they will assign a WAN IP address (not LAN) to you router of 192.168.0.x, 10.x.x.x, or 172.16-31.x.x  If in doubt, supply the make and model of your modem and we can advise.

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Rob WilliamsCommented:
Another option I forgot is the local/home and office subnets have to be different. Perhaps the modem is assigning an IP from a different subnet, explaining why it works. If for example the WRT54GS and the MN-700 are both using a LAN subnet of 192.168.1.x and so is your office, try changing the home router to something like 192.168.2.x
Rob WilliamsCommented:
Mario, were you able to gain access with the QuickVPN client?
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