[分享]如何优化你手中的华硕无线路由器

rickygao

家里有华硕无线路由器的朋友可以参考我的这篇文章来优化各种参数，让你的路由器性能最大化
I’ve been really enjoying Asus wireless router at home for years, which I believe is the best home wireless router in the world.
The reason why I’m saying best is because of the following consideration as a home wireless router

• Coverage
• Performance
• Features
• Compatibility
• Third party firmware support, like Tomato and DD-WRT
  

The last Asus wireless router I was using was RT-N16 which is one of the classic router from Asus, it served my home for 2 years without any issues. However, by moving into a bigger house and all of my devices now supporting dual-band network, it seems that I have to buy a new router.
The consideration of the new router will still be the above, especially for the best signal coverage as I don’t want to extend my network by using any WIFI extender and slow down my network.
Lucky, the new Asus RT-AC87U can meet all of my requirements, the only AC2400 4×4 MIMO wireless router in the world with 465m2 coverage premised.

In case some people need to understand a few performance parameters:
AC2400: the WIFI network speed can reach to 2.4Gb with 600Mbps (Max speed of 2.4GHz network) plus 1734Mbps (5GHz network)
4×4 MIMO: best router capacity, read here
With the best hardware (home router), our next step is to tweak the router to best match our environment since every family may have their own needs.
So the first thing we need to think about is the firmware loaded on the router.
Since Asus router supported various types of firmware, and they all have pros and cons, you can consider by my below matrix

Firmware	RT-AC87U Supported	HW Acceleration	VLAN	Guest Network	VPN	QoS	Per IP Traffic Monitoring	Save History to USB	Static DHCP Nickname	Firmware Quality
Asus Original	Yes	Yes	No	Yes	Yes	Yes	No	No	No	Stable
Asuswrt-Merlin	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Stable
Tomato		No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Less Stable
DD-WRT		No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Less Stable

I also struggling a long time to decide since all of the features are critical for me, especially for a home network with a lab. Although both Tomato and DD-WRT still haven’t support the latest RT-AC87U yet, but I can still flash to it, just lacking the new feature support I believe.
However, the Hardware Acceleration can boost your router a lot, especially for NAT, the internet speed once you have a large number of devices, I don’t want to miss these important feature, so finally I decided to go with Asuswrt-Merlin, which is the one just right build on the original firmware with more customized features. Once Tomato and DD-WRT starting support HW Acceleration, I may switch to them.
To be more clear on the Hardware Acceleration on both Asus original and Asuswrt-Merlin firmware, please refer to below table

• CTF(Cut Through Forwarding): Software optimization technique to accelerate NAT
• FA (Flow Accelerator): Hardware NAT acceleration mechanism design for accelerating wired DHCP and Static IP connections
  

Level 1=CTF Only
Level 2=FA + CTF

Category	Feature	Menu	Support HW Acceleration  Level
QoS	Traditional	Adaptive Qos->QoS	Off
QoS	Adaptive	Adaptive QoS->QoS	Level 1
None of Above			Level 2

Asuswrt-Merlin

Category	Feature	Menu	Support HW Acceleration  Level
QoS	Traditional	Adaptive Qos->QoS	Off
Traffic Monitor	IP Traffic Monitoring	Tools->Other Settings	Off
QoS	Adaptive	Adaptive QoS->QoS	Level 1
None of Above			Level 2

OK, now we are clearly enough on the Hardware Acceleration, let’s start tunning the settings
I will ignore a few basic settings since everybody should knows that , will only focus on the advanced settings
1. Wireless->General

Option	Description	Recommendation
Protected Management Frames	Current 802.11 standard defines "frame" types for use in management and control of wireless links. IEEE 802.11w is the Protected Management Frames standard for the IEEE 802.11 family of standards. TGw is working on improving the IEEE 802.11 Medium Access Control layer. The objective of this is to increase the security by providing data confidentiality of management frames, mechanisms that enable data integrity, data origin authenticity, and replay protection. These extensions will have interactions with IEEE 802.11r and IEEE 802.11u More security, Less compatibility	Disable
Wireless Mode (2.4GHz)	Max the 2.4GHz performance since the 802.11 a/b/g connection will slow down the 2.4GHz speed, and it’s hardly to see any a/b/g client now	N only
Network Key Rotation Interval (2.4GHz+5GHz)	The key is automatically generated from the SSID and the password set for the network. Refreshing of this key does not mean that a new password will have to be entered every hour. However, it results into Internet connection being unavailable for some time at regular intervals More security, connection may lost during key renew	0

2. Wireless->WPS

Less security protocol, just turn it off
3. Wireless->Professional

Option	Description	Recommendation
Roaming assistant	Enabled if more than one AP	Disable
IGMP Snooping (2.4GHz+5GHz)	Better streaming TV	Enable
Preamble Type	Preamble Type defines the length of time that the router spent for CRC (Cyclic Redundancy Check). CRC is a method of detecting errors during data transmission. Select Short for a busy wireless network with high network traffic. Select Long if your wireless network is composed of older or legacy wireless devices. Newer wireless "b" devices using a short preamble typically experience quicker data transfers. Moving from a long to short preamble will not solve poor connection issues or slow Internet speeds. However, moving to wireless "g" and wireless "n" devices increases transfer speed and range. Short preambles work with every wireless type other than older types with limited transmission rates in the 1 to 2 Mbps range. Better performance, Less compatibility	Short
AMPDU RTS	Deal with traffic congestion problems. For example, the throughput of your machine might be suffering when others are doing large downloads or file transfers or streaming media	Enable (default)
Enable TX Bursting	Improve transmission speed of g device	Enable
Enable WMM APSD	WMM APSD is a QoS setting which, when enabled, allows some devices to go into a lower power and higher latency state while others stay as low latency as possible. WMM = QoS and APSD = Automatic Power Save Delivery.	Enabled (default)
Reducing USB 3.0 interference	Better 2.4GHz performance and range, less USB 3.0 speed	Enable
Optimize AMPDU aggregation	MPDU aggregation also collects Ethernet frames to be transmitted to a single destination, but it wraps each frame in an 802.11n MAC header. Normally this is less efficient than MSDU aggregation, but it may be more efficient in environments with high error rates, because of a mechanism called block acknowledgement. This mechanism allows each of the aggregated data frames to be individually acknowledged or retransmitted if affected by an error	Disable (default)
Optimize ack suppression	with no ack is that SSL based communications are more likely to error, very slight bandwidth decrease with it enabled	Disable (default)
Turbo QAM	Better performance, both router and client must support it	Enable (default)
Airtime Fairness	With airtime fairness, every client at a given quality-of-service level has equal access to the network’s airtime. This is essential for ensuring predictable performance and quality-of-service, as well as allowing 802.11n and legacy clients to coexist on the same network. Without airtime fairness, router using mixed mode networks risk having legacy clients slow down the entire network or letting the fastest clients crowd out other users	Enable (default)
Explicit beamforming	The clien’ts WLAN adapter and router both support beamforming technology. This technology allows these devices to communicate the channel estimation and steering direction to each other to improve download and uplink speed.	Enable (default)
Universal Beamforming	For legacy wireless network adapter that do not support beamforming, the router estimates the channel and determines the steering direction to improve the download speed	Enable (default)
Regulation mode	IEEE 802.11h is the IEEE standard for Spectrum and Transmit Power Management Extensions. It solves problems like interference with satellites and radar using the same 5 GHz frequency band. It was originally designed to address European regulations but is now applicable in many other countries. The standard provides Dynamic Frequency Selection (DFS) and transmit Power Control (TPC) to the IEEE 802.11a MAC It has no useful function as far as we are concerned. However, if left "floating" in an unknown state, it caused association problems	Off (default)

4. LAN->Switch Control

Option	Description	Recommendation
NAT Acceleration	HW Acceleration	Auto
Enable Jumbo Frame	More compatibility, less performance	Disable

5. WAN->Internet Connection

Option	Description	Recommendation
Enable VPN + DHCP Connection	If you enabled VPN service, this must be enabled	Yes

If you would like to flash the router to Tomato, you can refer to here

staples

netgear R8000 比它好，很少设备支持4×4 MIMO，还不如R8000两个频段的5G网有效。有篇文章分析过。Dynamic QoS对同时游戏，下载，HD streaming 的带宽分配效果也非常好

rickygao

staples 发表于 2015-2-25 22:49
netgear R8000 比它好，很少设备支持4×4 MIMO，还不如R8000两个频段的5G网有效。有篇文章分析过。Dynamic  ...

萝卜青菜各有所爱，4x4和trible-band各有各的优点，而且华硕也推出了ac3200的路由器
我自己还是更在乎覆盖率，trible-band的亮点是复杂设备环境下的性能，而不是覆盖率。起码华硕敢承诺465平米覆盖，实际使用中覆盖效果超级好，我朋友家2000平米一个AC87U基本覆盖

有兴趣的可以看看这里http://pcdiy.asus.com/2014/06/rt ... uter-computex-2014/
华硕自身已经澄清了这两款路由器的侧重点不同

RT-AC3200 vs RT-AC87U – Don’t Be Confused

the case for buying the AC87U

if your talking about max performance in the home. The 87U will provide a 1700Mbps 5GHZ 802.11AC 4×4 Bridge between the two routers… and if you can get your clients laptops with build in 802.11AC (like the Intel AC7260 card) connected on the 5Ghz you will get 866mbps 2×2 Max connection (until someone releases a 3×3 internal card or USB device then 1300Mbps)

in this case if you have 2-3 older 802.11N or G devices connect them to the 2.4ghz radio with a 40mhz channel if no other networks are nearby (or a 20mhz wil give better throughput if it’s there are lots of other wireless networks around)… my understanding this will NOT slow down your 5Ghz 1300 bridge or 866mbps clients

(if you attempted to connect your 802.11N 5ghz to the existing 802.11AC 5ghz it would slow down your overall network

So why buy the AC-3200

the Speed of this Router is Slower… limited to 1300Mbps 3X3… (you cannot bond for a single 2600Mbps connection) it’s “Tri-Band” meaning in the case above your bridge would be limited to 1300Mbps not 1700mbps but the big advantage is that a slower client would not slow down the rest of your network

so you have all your 802.11AC 5Ghz clients connect to Radio #1 – your 802.11N 5GHZ would connect to Radio #2 and your older 2.4ghz would connect to Radio #3 – so for an office or “mix mode” office this would be a better router..

to make this more confusing some companies like Cisco are introducing 802.11AC routers with 4 physical antennas but still 1300Mbps – the forth antenna is basically used for better reception – but consumers see 4 antennas and think it’s faster.

basically what you want is an 802.11AC routers with the largest channel size like 160mhz vs 80mhz and the greatest # of streams.. take a look at the visual chart below it explains things in more detail – so you want to buy a router with 8 Streams on the 160mhz channel for 6.92Gbps throughput – but this doesn’t exist yet. (if I have said anything wrong in this post… please let me know :-)

fengliu1234

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future2521

看晕了。。。加分帮顶了。

chiu793

有些圖失聯了!
請問可以補圖嗎?
謝謝喔~

明月星光

已经准备从3台华硕路由切换到ubiquiti体系……

chiu793

感謝R大您的幫忙讓圖片回復!
另外想請問您設定這些參數是否有您的看法呢?
例如 IGMP Snooping (2.4GHz+5GHz) . Enable WMM APSD 等等 網路搜尋的結果都是建議"關閉"

Network Key Rotation Interval (2.4GHz+5GHz)  為何是設為"0" ,而不適預設值呢?

最後是這個CTF(Cut Through Forwarding): Software optimization technique to accelerate NAT
FA (Flow Accelerator): Hardware NAT acceleration mechanism design for accelerating wired DHCP and Static IP connections
Level 1=CTF Only
Level 2=FA + CTF

看不太懂是要從哪邊設置~  

Leetecit

就一枪文也有人顶。就是用default就可以了，哪有什么（通用）优化，只有根据实际环境作些tweaking，这个没一点基础哪能行。

什么“best home wireless router” 就一无耻的推广常用词而已，实际就是让你花双倍的钱买一些无甚意义的所谓功能，即是浪费钱而已。

有人连基础的双向传输都不知道就跟着谈什么覆盖率了，不知所谓。

就是这些骗人的东东，才会有人花大钱买了一（堆）router，到头来还得像楼上那个换成AP。