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Issues with 2.4 GHz speed on the new TP-Link AC4000 (Archer A20)

Issues with 2.4 GHz speed on the new TP-Link AC4000 (Archer A20)

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tomadam9
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03-01-2025, 02:11 AM
#1
Hi, I just installed my TP-link AC4000, also known as Archer A20, and it's performing well overall. The only issue is with the 2.4GHz frequency; I'm only achieving up to 40 Mbps, while the maximum bandwidth is listed at 200 Mbps. When operating in router mode, I see around 230 Mbps down. It also works in 'router mode' as it did with my Spectrum router, which provided similar speeds on the 5G band. I'm curious about what might be limiting the performance. Both IPv4 and IPv6 are active, and I haven't altered default settings except for names and passwords. Security protocols are all turned on, and I switched IPv6 LAN type to DHCPv6 instead of the default SLAAC + Stateless DHCP. Should I revert to SLAAC + Stateless DHCP, or is my DHCPv6 setup sufficient? I'm seeking improvements in speed, reliability, range, and security. My IPv4 connection seems sluggish—have I accidentally enabled too many security features? That doesn't seem logical. Perhaps it's just a minor adjustment, but reducing speeds significantly isn't the case. If anyone has suggestions, it would be greatly appreciated! Model: Archer A20 Hardware Version: V3 Firmware Version: 1.03 20191026 rel.16299 (5553) Thank you in advance, Sithtiger
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T
tomadam9
03-01-2025, 02:11 AM #1

Hi, I just installed my TP-link AC4000, also known as Archer A20, and it's performing well overall. The only issue is with the 2.4GHz frequency; I'm only achieving up to 40 Mbps, while the maximum bandwidth is listed at 200 Mbps. When operating in router mode, I see around 230 Mbps down. It also works in 'router mode' as it did with my Spectrum router, which provided similar speeds on the 5G band. I'm curious about what might be limiting the performance. Both IPv4 and IPv6 are active, and I haven't altered default settings except for names and passwords. Security protocols are all turned on, and I switched IPv6 LAN type to DHCPv6 instead of the default SLAAC + Stateless DHCP. Should I revert to SLAAC + Stateless DHCP, or is my DHCPv6 setup sufficient? I'm seeking improvements in speed, reliability, range, and security. My IPv4 connection seems sluggish—have I accidentally enabled too many security features? That doesn't seem logical. Perhaps it's just a minor adjustment, but reducing speeds significantly isn't the case. If anyone has suggestions, it would be greatly appreciated! Model: Archer A20 Hardware Version: V3 Firmware Version: 1.03 20191026 rel.16299 (5553) Thank you in advance, Sithtiger

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Koalacat101
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03-01-2025, 02:11 AM
#2
The outdated router might have been violating regulations and operating on a 40Mhz channel while other overlapping 2.4Ghz networks were present, whereas the newer model complies with standards. It’s also conceivable your client uses a 3x3 or 4x4 MIMO setup (though rare, older Macs typically supported this, and 2x2 remains most common), and nearly all contemporary routers support 2x2 MIMO on 2.4Ghz. With just a 20Mhz channel width in a 2x2 MIMO configuration, it’s not unusual to hit 40Mbit speeds.
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Koalacat101
03-01-2025, 02:11 AM #2

The outdated router might have been violating regulations and operating on a 40Mhz channel while other overlapping 2.4Ghz networks were present, whereas the newer model complies with standards. It’s also conceivable your client uses a 3x3 or 4x4 MIMO setup (though rare, older Macs typically supported this, and 2x2 remains most common), and nearly all contemporary routers support 2x2 MIMO on 2.4Ghz. With just a 20Mhz channel width in a 2x2 MIMO configuration, it’s not unusual to hit 40Mbit speeds.

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