I'm a new CenturyLink DSL customer. Signed up for 100/10. This is the first time ever I've left cable companies to switch to copper DSL. I'm actually pretty happy with the quality of the service. I pretty much get the full speed at all times on wired devices. I do have one issue which I won't mind living with if I have to. I think it may be related to MTUs but wanted to get some second onions. I'm leased a C3000Z device. Anything that I hardware in is able to get full speed. Mobile devices using wireless can't seem to pass the 30 Mbps threshold. I know it's not a signal issue because all wired devices work at full speed all the time. For wireless I'm testing with a laptop which has a network port I use for wired testing, and a mobile phone. To rule out it being the wireless radio on the C3000Z, I set the modem into transparent bridge mode with untagged vlan and configured a asus rt-ac68u with PPPoE and vlan tagging 201 on WAN port. Same thing, wired devices go full speed and wireless hits a cap of around 30. With my old cable provided, I know the MTU on the wan side was 1500. With PPPoE connections, I know the MTU is a bit less for the auth overhead. I actually get faster local links on wifi with the rt-ac68u. My mobile device using the C3000Z radio shows a local link of 86 Mbps as opposed to almost 900 with the Asus. So I know my Asus is definitely able to handle a 100 Mbps connection. Same setup with cable allowed full 250 Mpbs over wifi on my devices using AC. The only thing that changed on the Asus is I have a PPPoE connection now over a DHCP wan port. In both cases, wired devices always work full speed, but wireless stays at around the same speed cap. I can't help but think it may be an MTU issue with wireless devices, but wanted to see if anyone had seen something similar out there? TLDR: CL router/modem or Asus AP, wired devices hit full speed, wireless devices hit the same 30 Mbps. Only thing that changed on the asus is the switch to a slower 100 Mpbs connection. What else could cause this?
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