E4200V2 slow wired LAN speeds

Set up my new E4200V2 last night, everything appeared to be working but while streaming videos over wired LAN I get short hiccups over wired. While streaming videos, a few second long pause is really, distracting, this is a deal breaker and my previous router (DIR-655) had no issue streaming any videos. The wiring has not changed, only the router.
So onward to trying to lock down the problem.
I set up a ping between two wired linux boxes, and get:
64 bytes from 192.168.0.5: icmp_seq=65 ttl=64 time=0.184 ms
64 bytes from 192.168.0.5: icmp_seq=66 ttl=64 time=0.180 ms
64 bytes from 192.168.0.5: icmp_seq=67 ttl=64 time=0.566 ms
64 bytes from 192.168.0.5: icmp_seq=67 ttl=64 time=10.52 ms
Whoa, 10 ms over gigabit LAN. This is crazy, but doesn't tell us much. The 10 ms was one out of hundreds of pings, so its only intermittant. This might explain the hiccups, but this router doesn't appear to log anything, so its hard to say.
Next was scp transfers, which never exceed 15MB/s, in either direction. For gigabit, wired LAN this is awful, with my previous DIR-655 I would get at the very least 40 MB/s, in all situations.
Next up, iperf. I set up iperf on the two hosts, and iperf reports reasonable gigabit speeds
3] local 192.168.0.5 port 48303 connected with 192.168.0.3 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.10 GBytes 941 Mbits/sec
and on the iperf server:
4] 0.0-10.0 sec 1.10 GBytes 940 Mbits/sec
I have tried the following solutions:
Firmware: its the newest firmware, as of last night (Feb 14) 2.0.36 build 126507 2011-12-23 01:39
MTU - I adjusted this to 1400, 1492, 1450, set to auto, no difference
QoS - I enabled this as someone reported QoS being off would throttle certain transfers, no difference
I added both the MAC addresses of the two linux boxes as High Priority in QoS, no difference
I'm running out of things to try. Tonight I am thinking of reverting to an old firmware, doing a hard reset and seeing if it persists, and if no ideas come up in this forum, it is getting returned, 15MB/s over gigabit lan is terribly broken.
Any ideas?
Xian

Try these troubleshooting steps:
A] With the help of Cisco Connect Software (if at all you have installed the router with the help of this software)
1] Open the software and go to the option which says "Router Settings"
2] Then click on the option which says "Advanced Settings" which will take you to the router's configuration page.
3] Then click on security and disable the SPI firewall.
B] If you haven't installed Cisco Connect then you can log on to the router's user interface using it's default IP address in the browser which is 192.168.1.1 and type in 'admin' as the password leaving the username field blank. This will take you to the router's web interface and then follow steps as mentioned above to make the changes.
Hope it will help you.
Second, you can reduce the speed of the LAN card as well.
Here is the step:
START--> right-click My Network Places and click Properties
right-click on the device and click properties
Click on the CONFIGURE button
Select the ADVANCED tab and the settings you can alter are listed on the left.
Try to make the LAN speed to manual speed.

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Message Edited by Bigmatt on 07-07-2009 11:47 AM
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Thanks for the help, Hubrisnxs.
Here's an update since I got home:
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Performance mode ('n')
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Maybe I'll try channel 11 next.....
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Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
SendBufferSize set to [261360]
running 10s outbound test (client to server) . . . . . 34.66Mb/s
running 10s inbound test (server to client) . . . . . . 84.24Mb/s
------ Client System Details ------
OS data&colon; Name = Windows XP, Architecture = x86, Version = 5.1
Java data&colon; Vendor = Sun Microsystems Inc., Version = 1.6.0_37
------ Web100 Detailed Analysis ------
Client Receive Window detected at 1045440 bytes.
622 Mbps OC-12 link found.
Link set to Half Duplex mode
Information: throughput is limited by other network traffic.
Good network cable(s) found
Normal duplex operation found.
Web100 reports the Round trip time = 41.51 msec; the Packet size = 1452 Bytes; and
There were 72 packets retransmitted, 2254 duplicate acks received, and 2281 SACK blocks received
The connection was idle 0 seconds (0%) of the time
This connection is sender limited 91.83% of the time.
This connection is network limited 8.17% of the time.
Web100 reports TCP negotiated the optional Performance Settings to:
RFC 2018 Selective Acknowledgment: ON
RFC 896 Nagle Algorithm: ON
RFC 3168 Explicit Congestion Notification: OFF
RFC 1323 Time Stamping: OFF
RFC 1323 Window Scaling: ON
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Information: Network Address Translation (NAT) box is modifying the Client's IP address
Server says [] but Client says []
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strike that.
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Hello Tesserax
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Anirudh Hingle wrote:
I have already followed his blog but i think he is explaining the process if one has a data cord or something...
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Message was edited by: r.cloud

[Solved] Failed to connect internet by Wired LAN, but wifi is working.

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Last edited by rasr11 (2015-04-12 01:50:44)

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E4200V2 slow wired LAN speeds

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