Kadigan
DD-WRT Novice
Joined: 19 May 2017
Posts: 12
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 Posted: Wed May 24, 2017 14:03 Post subject: (Unresolved) WRT1900ACSV2 r30880 slow LAN-to-WAN via iperf |
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I have the Linksys WRT1900ACSV2 (named on the box as WRT1900ACS-EU). After some research on the forums, I've found release r30880 to seem fair.
In general it works well - no restarts that I'm aware of, and WiFi seems to be available. But there is a LAN-to-WAN speed problem.
My test setup:
a) a test machine w/ 10gbit port (addressed 192.168.1.1) connected to Router's WAN
b) my NAS w/ 1gbit port (addressed as 10.20.0.102) connected to any of the Router's LAN ports (checked all 4)
c) secondary computer for monitoring via 10/100 USB dongle
My test software:
iperf1 + iperf2, iperf3
Prep:
a) hook up NAS to one of the Router's LAN port
b) hook up the PC to Router's WAN port
c) configure PC with 192.168.1.1/24
d) configure Router WAN w/ static 192.168.1.9/24
e) configure NAS with DHCP from router (received 10.20.0.102/24)
f) forward port 5678 to 10.20.0.102:5678
g) connect a "monitoring PC" via a 10/100-to-USB dongle, assign DHCP (got 10.20.0.92)
h) start iperf (1/2/3) on NAS w/ port 5678
i) start iperf (matching) on PC w/ port 8765
Complete iptables:
| Code: | #!/bin/sh
iptables -F
iptables -t nat -F
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -t nat -A PREROUTING -p tcp -i `get_wanface` --dport 5678 -j DNAT --to-destination 10.20.0.102:5678
# working with /22 because I later intend to assign 10.20.1.0/24 and 10.20.2.0/24 for Guest-WiFi and VPN, respectively
iptables -t nat -A POSTROUTING -s 10.20.0.0/22 -j MASQUERADE
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Tests:
1) PC (10gbit) to NAS (1gbit) via Router:WAN-to-LAN (PC: `iperf -c 192.168.1.9 -p 5678`) -- sustained 780Mbps
2) monitoring PC (10/100) to NAS (1gbit) via Router:LAN (monitoring: `iperf -c 10.20.0.102 -p 5678`) -- sustained 95Mbps
3) NAS (1gbit) to PC (10gbit) via Router:LAN-to-WAN (NAS: `iperfc -c 192.168.1.1 -p 8765`) -- sustained 80Mbps
The last bit is my problem. WAN-to-LAN is 780Mbps, while LAN-to-WAN is around 80Mbps (average 76.5Mbps) and refuses to go up much (standard jitter allows for momentaty 90Mbps). I find it weird that it'll go ten times as fast from WAN - I'd expect a 2:1 ratio, but a 10:1?
I disconnected the NAS from the router (1900ACSv2) and hooked it back up to my main router (RT-N18U), then tried iperf between it and my personal PC (1gbit) LAN-to-LAN -- seeing around 420Mbps sustained throughput both ways, so it doesn't seem to be a misconfiguration problem on the NAS.
Ideas?
(ad.2 -- 95Mbps, or about as much as I could reasonably expect from a 10/100 dongle - and slightly more than I realistically expected from the TP-Link gizmo)
(I tried browsing the subforum but found it difficult w/ non-obvious topics; I then did a search for my model to see if anyone else reported this problem -- doesn't seem like it, and I checked every found thread) |
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Kadigan
DD-WRT Novice
Joined: 19 May 2017
Posts: 12
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| Posted: Wed May 31, 2017 6:42 Post subject: |
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I have passed the device onto the intended recipient. Upon installation in the target network, it showed improvement in LAN-to-WAN transfer (consistent 100Mbps), and I don't understand why. I assume my testing methodology was flawed.
Flagging as "Unresolved" because I no longer have the device.
It could be useful if anyone could point out to me why my testing showed an issue where there apparently wasn't any.
**Edit**
It's been pointed out to me that I have, in all likelihood, used iperf improperly while testing. |
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