Sure.
Reason for my suggestion, it seems that some ISP Modems have built in router. Some can be disabled or bridged and effectively turning that function off with in the modem and giving that duty to the external router, i.e. DIR-655. In some cases however, we've seen that in most recent ISP Modems, they are making it hard to let the modem and external router interact with each other. One reason is that ISP are providing more than just Internet service, there providing voice and video services as well, as this is all being handled by the ISP Modem. Thus bridging is not an option on some of these modems. This can make working with external routers a bit more difficult as external routers are designed to handle internet services, DHCP Cable and DSL PPPoE and other protocols. Having 2 routers on the same line causes
Double NAT issues among other problems seen when in this configuration. Sometimes most ISP modem include was called DMZ. This option is supposed to un-filter and pass any and all data traffic from the Internet side of the modem or router to the private LAN side with out any interference. In most cases this works and helps with connecting external routers should the ISP modem not allow any bridging. I've seen in some DSL modems as of last there has a newer version of DMZ (Plus) which is supposed to work well, however, some people are having some problems with it and working with various devices. So it seems were hitting another bump in the road with modems and external routers.
The reason for mentioning the
DAP-1525 for example, model APs and and switch in your case, it seems to be that the ISP modem is going all the modem and routing and networking functions. It's possible in come cases that customers can buy there own modem hardware to use with external routers as well. Some ISP don't allow this. There are pros and cons to all this. Anyways, if the ISP modem is going to handle all the modem, router and networking functions, why have another router trying to do the same thing. Lets take the external router off the line and replace with just a AP and a switch. The AP will provide you with 2.4 and or 5Ghz Wifi and the switch will provide you with additional wired connections should the ISP modem be limted to 4 ports or a few in back. Doing this will eliminate the extra external router condition with the ISP modem and router thats already doing the job.
Bridge Mode vs Relay vs Acess Point (AP) / Routers vs Dedicated Access Points (AP)Help any?