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Duplex Mismatch Issue!


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As we speak I am on hold with Cox trying to figure out my issue. The rep won't transfer me to a Level 2 agent, and he is clueless. I need some help!

Setup Information:

Windows XP Home Edition

NVIDIA nForce Networking Controller (onboard)

(Also installed, Network Everywhere Fast Ethernet Adapter. Same results)

Ethernet cable connection, cable internet (rated 1 Mpbs UP, 9 Mpbs down)

No registry edits in place

Motorola SURFboard Gateway SBG900

Line Setup:

Incoming Line > SVI Subscriber Amplifier (Gain 15 dB) >

(1st Out) To Monster Cable 2 GHz Two-Way Splitter

-(1) Cable to Computer room

-(2) Digital Cable in the Family Room

(2nd Out) To Three-Way Splitter for Rest of House

I'm doing network testing via http://netspeed.stanford.edu/

This is my testing results with "Full Autonegotiation":

WEB100 Enabled Statistics:

Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done

running 10s outbound test (client to server) . . . . . 1.04Mb/s

running 10s inbound test (server to client) . . . . . . 8.19Mb/s

------  Client System Details  ------

OS data: Name = Windows XP, Architecture = x86, Version = 5.1

Java data: Vendor = Sun Microsystems Inc., Version = 1.5.0_08

------  Web100 Detailed Analysis  ------

Cable modem/DSL/T1 link found.

Link set to Half Duplex mode

No network congestion discovered.

Good network cable(s) found

Alarm: Duplex mismatch condition found:  Host set to Full and Switch set to Half duplexD

Web100 reports the Round trip time = 57.05 msec; the Packet size = 1460 Bytes; and

There were 14 packets retransmitted, 387 duplicate acks received, and 255 SACK blocks received

The connection was idle 0 seconds (0%) of the time

This connection is network limited 99.8% 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

Packet size is preserved End-to-End

Server IP addresses are preserved End-to-End

Information: Network Address Translation (NAT) box is modifying the Client's IP address

Server says [X.X.X.X] but Client says [X.X.X.X]

With "Autonegotiate for 10 HD":

WEB100 Enabled Statistics:

Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done

running 10s outbound test (client to server) . . . . . 1.05Mb/s

running 10s inbound test (server to client) . . . . . . 6.63Mb/s

------ Client System Details ------

OS data: Name = Windows XP, Architecture = x86, Version = 5.1

Java data: Vendor = Sun Microsystems Inc., Version = 1.5.0_08

------ Web100 Detailed Analysis ------

Cable modem/DSL/T1 link found.

Link set to Half Duplex mode

No network congestion discovered.

Good network cable(s) found

Normal duplex operation found.

Web100 reports the Round trip time = 131.88 msec; the Packet size = 1460 Bytes; and

There were 4 packets retransmitted, 436 duplicate acks received, and 284 SACK blocks received

The connection was idle 0 seconds (0%) of the time

This connection is sender limited 30.68% of the time.

This connection is network limited 69.32% 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

Packet size is preserved End-to-End

Server IP addresses are preserved End-to-End

Information: Network Address Translation (NAT) box is modifying the Client's IP address

Server says [X.X.X.X] but Client says [X.X.X.X]

So there it is. If anyone can offer me any help, I'd really appreciate it! I've been fighting this thing for over two months now, and what was first just a tid bit annoying, is now really bugging me.

If anyone could just help me figure out what a few things are, that could help a bunch too. I'm somewhat knowledgeable with networks and such, so some definitions and common usages/locations would benefit my troubleshooting a great deal

What is a network switch and where is it located? Should I get a different Ethernet Adapter? I'm being rushed so I cannot properly finish this post, but I'll try and further it later. Thanks in advance 

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Welcome to the forum ;)

Don't worry about it as long as your speeds are fine (and they're pretty good)

That duplex tester isn't very accurate from my experience.  Also it could be that your modem is half duplex.

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Welcome the the forum!

php hit it on the head... for the most part the modems til this point have operated at 10Mbps..  not 10/100..  So that is what you are seeing.. also like php said.. if your speeds are ok.. then you should be alright.  I know my 5100 operates at 10Mbps..

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