Dynamic IP vs PPPoE

[DSD27]

Hey guys, a while ago I got a TP-Link router to replace the ISP one, the ISP router is being used for Voip only. When first configuring it, I chose the option Dynamic IP. It works, but my ISP provides PPPoE username and password. So should I use it instead? What's the difference?

I tried using a Lan to Lan option with the two routers but Voip didint' work, only works with Wan on the second router (ISP), is that related?

 

 

[Alex Atkin UK]

VoIP is complicated, as there are various ways your ISP may deliver it and the main router may not allow handing over the PPPoE link to a second router while maintaining VoIP itself.

 

With Dynamic IP you are basically just letting the main router be the router, and adding a second router on top which is only seen by the main router as a LAN client, which is generally a bad idea too.  In that configuration you usually want the second router to only act as an Access Point, not doing any routing at all.

What is the purpose of the second router in your setup?

[DSD27]

Yeah but I can also pick PPPoE and let the main router be the router? What will change? The option is there...

Edit: Nevermind, the PPPoE username and password were for the ADSL connection I had before, from the same ISP. 

 

Just there for Voip, otherwise I wouldn't use it.

Right now I have ONT -> TP Link (Wan), TP Link port 4 (bridge port) -> ISP router Wan port. That's the way Voip works. I tried  Lan -> Lan to have only one network but I get no Voip.