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Receiver and Sender Limited?
Posted by: rapayn1
Date: October 15, 2011 08:01AM
For the past 48 hours our Verizon FIOS Internet connection connection has been flakey. Maybe it is due to all of the rain we have been getting here in Maryland. When the network is working correctly, things move fast enough for me. However, when it is not acting properly, web pages keep stalling and needing to be refreshed. Some pages don't load at all. Xbox Live drops its connections in the middle of online games, etc. Running tests on Verizon's speediest system, as well as Speakeasy, DSLReports tools and many others, shows various readings (some good and some bad). On the Verizon Web100 report, I saw the following and wondered what it meant (the Verizon support person could not tell me):

This connection is receiver limited 10.23% of the time.
This connection is sender limited 88.38% of the time.
This connection is network limited 1.38% of the time.:

Having something limited 88.38% of the time sounds like a BIG problem to me. I'm assuming I am the receiver and that Verizon is the sender, or whatever web site I am going to is the sender. Yet, the network is only limited 1.38% of the time. This seems odd.

Analysis information:

Checking for Middleboxes . . . . . . . . . . . . . . . . . . Done
SendBufferSize set to [131768]
running 10s outbound test (client to server) . . . . . 5.04Mb/s
running 10s inbound test (server to client) . . . . . . 25.19Mb/s

------ Client System Details ------
OS data: Name = Mac OS X, Architecture = x86_64, Version = 10.7.2
Java data: Vendor = Apple Inc., Version = 1.6.0_26

------ Web100 Detailed Analysis ------
Client Receive Window detected at 524280 bytes.
10 Mbps Ethernet link found.
Link set to Full Duplex mode
No network congestion discovered.
Good network cable(s) found
Normal duplex operation found.

Web100 reports the Round trip time = 156.15 msec; the Packet size = 1448 Bytes; and
No packet loss was observed.
This connection is receiver limited 10.23% of the time.
This connection is sender limited 88.38% of the time.
This connection is network limited 1.38% 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: ON
RFC 1323 Window Scaling: ON
Information: Network Middlebox is modifying MSS variable
Server IP addresses are preserved End-to-End
Information: Network Address Translation (NAT) box is modifying the Client's IP address
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Re: Receiver and Sender Limited?
Posted by: modelamac
Date: October 15, 2011 10:32AM
Good site to bookmark. Maryland is not 100% at the moment. You may be in that 6% with problems.

[www.internettrafficreport.com]



Mr. Curmudgeon, on Mountain Lion.
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Re: Receiver and Sender Limited?
Posted by: rapayn1
Date: October 15, 2011 10:40AM
Modelamac,

Thank you!! Great site. Things are better than last night. SItes not responding is more the exception rather than the rule. Of course it is not raining here today either. LOL!!!

Did I understand the whole "This connection is sender limited 88.38% of the time" and "This connection is receiver limited 10.23% of the time." statements? What are they talking about there? Is this something on Verizon's end or something with my Macintosh computer? The only thing new that I have done (which is a big change) has been to update my OS to 10.7.2. So, while that might be a coincidence, I hate when right after I make a change, something like this happens.
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