Question about D-Link DIR-625 (790069292637) Wireless Router

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TCP Block When I try to stream video online, I get buffering issues. When I looked at the log details, I found blocked TCP packet. Thanks in advance

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  • Diga Dec 08, 2007

    Could you explain in more details. I tried to follow this link but can not find any thing.
    Here is the logs from the router:
    [INFO] Sat Dec 08 08:38:09 2007 Blocked outgoing TCP packet from 209.20.1.181:1755 to 68.147.7.251:1543 with unexpected acknowledgement 2219659722 (expected 2219528870 to 2219659715)

    (Knowing that 68.147.7.251 is the IP address of my Motorola modem (Shaw cable)
    , 209.20.1.181 is the IP address of the site I am trying to stream)

    Thanks

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  • 173 Answers

In this case.. certain ports have to be forwarded.. log in to your router setup page and forward the ports

Posted on Dec 08, 2007

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1 Answer

What does queue mean, it comes up on movies ?


tcp/ip protocol uses a try to send one packet and then check if it got received ok
then it will send two packets and check
then it will send four packets and check
then it will send eight packets and check
you get the picture 8,16,32,64,128,256,512,1024,2048,4096, error ok lets resend one packet and check
2,4,8,16,32,64,128,256,512,1024,2048
so if no errors occur the packets sent increase rapidly. However if there is an error it goes back to one packet.
Now this is not really a problem if say you were downloading a file but if you are watching a time dependent streamed movie this might slow down to a point where the movie would stop . So the media player software buffers the data. It downloads a quantity into memory and then when the buffer is full it starts playing the movie. However if you get errors or a slow bandwidth of data it has to queue while it restores data into the now empty buffer memory and might sto pplaying the movie while it does this.

Jan 16, 2018 | Computers & Internet

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How do latency and packet loss determine network performance and what can be...


The triumvirate of network performance metrics are packet loss, latency and jitter.

Almost all network applications use TCP (Transmission Control Protocol) to get their data from point A to point B. About 85% of the overall internet's traffic is TCP, of which specific aspect is that it completely hides the packet-based nature of the network from applications. Whether an application hands a single character or a multi-megabyte file to TCP, puts the data in packets and sends it on its way over the network. The internet is a scary place for packets trying to find their way: it's not uncommon for packets to be lost and never make it across, or to arrive in a different order than they were transmitted. TCP retransmits lost packets and puts data back in the original order if needed before it hands over the data to the receiver. This way, applications don't have to worry about those eventualities.

Network latency
TCP has a number of mechanisms to get good performance in the presence of high latencies:
1) Make sure enough packets are kept "in flight". Simply sending one packet and then waiting for the other side to say "got it, send then next one" doesn't cut it; that would limit throughput to five packets per second on a path with a 200 ms RTT. So TCP tries to make sure it sends enough packets to fill up the link, but not so many that it oversaturates the link or path. This works well for big data transfers.
2) For smaller data transfers TCP uses a "slow start" mechanism. Because TCP has to wait for acknowledgments from the receiver, more latency means more time spent in slow start. Web browser performance used to be limited by slow start a lot, but browsers started to reuse TCP sessions that were already out of slow start to download additional images and other elements rather than keep opening new TCP sessions.
3) Also you may use simple open-transfer-close-open-transfer-close sequences that work well on low latency networks but slow down a lot over larger distances or on bandwidth-limited networks, which also introduce additional latency.
4) Try to use a DNS server close by. Every TCP connection is preceded by a DNS lookup. If the latency towards the DNS server is substantial, this slows down the entire process.

Packet loss
Packets are lost in networks for two reasons:
1) Every transmission medium will flip a bit once in a while, and then the whole packet is lost. Wireless typically sends extra error correction bits, but those can only do so much. If such an error occurs, the lost packet needs to be retransmitted. This can hold up a transfer.
But if network latency or packet loss get too high, TCP will run out of buffer space and the transfer has to stop until the retransmitted lost packet has been received. In other words: high latency or high loss isn't great, but still workable, but high latency and high loss together can slow down TCP to a crawl.
2) Another reason packets get lost is too many packets in a short time: TCP is sending so fast that router/switch buffers fill up faster than packets can be transmitted.If TCP has determined that the network can only bear very conservative data transfer speeds, and slow start really does its name justice, it's faster to stop a download and restart it rather than to wait for TCP to recover.
Jitter - is the difference between the latency from packet to packet
Obviously, the speed of light isn't subject to change, and fibers tend to remain the same length. So latency is typically caused by buffering of packets in routers and switches terminating highly utilized links. (Especially on lower bandwidth links, such as broadband or 3G/4G links.) Sometimes a packet is lucky and gets through fast and sometimes the queue is longer than usual. For TCP, this isn't a huge problem, although this means that TCP has to use a conservative value for its RTT estimate and timeouts will take longer. However, for (non-TCP) real-time audio and video traffic, jitter is very problematic, because the audio/video has to be played back at a steady rate. This means the application either has to buffer the "fast" packets and wait for the slow ones, which can add user-perceptible delay, or the slow packets have to be considered lost, causing dropouts.

In conclusion, in networks that use multiple connections to the internet, it can really pay off to avoid paths that are much longer and thus incur a higher latency than alternative paths to the same destination, as well as congested paths with elevated packet loss. The path selecting process can be performed automatically: learnhow to automate evaluation of packet loss and latencyacross multiple providers to choose the best performing route.

on Jan 27, 2015 | Computers & Internet

2 Answers

How to resolve the Roku paid channels not working issue?


sorry no idea here . possibly your tv is not compatible

Nov 13, 2017 | Roku Televison & Video

1 Answer

WHAT ARE THE PORT RANGES FOR ADDRESSES


Usable tcp and udp ports range from 1 to 65535. However you should not need to open any ports by default. Most routers include a stateful packet inspection (SPI) firewall. This is a fancy way of saying the router inspects the packet on it's way out to the internet when a computer on the inside of the firewall sends it out to the internet. The firewall will only allow connections from the internet on that TCP or UDP port if it returns from the original destination. For example, if you send a packet requesting the web page at cisco.com, the firewall will only allow traffic back into your network on TCP port 80 from the web server at cisco.com. If a packet from any other IP address tries to piggyback into your network through tcp port 80, the firewall will block it.

The only reason to open ports on your firewall is to allow a server inside your network to receive unsolicited traffic e.g. a web server inside your network may need TCP port 80 and 443 (HTTP and HTTPS) opened if you want to be able to access it from the internet. A mail server may need port 25 and 110 open for SMTP/POP e-mail. However, most home users do not host their own mail or web servers.

Mar 22, 2014 | Cisco Linksys Refurbished E3000...

5 Answers

Whenever I try to play clips ( ie Youtube, etc) they keep stopping after a few seconds, they stop for maybe 20 seconds and they play for four seconds and stop and so on


This is generally a symptom of a download problem. Check your netowrk connections and verify that they are solid. The video is bufferred down to your local machine and displayed. The display is utilizing the downloaded data faster than you can load additional packets from the net. If you can not find the delay, pause the video for a little while. It will continue to load. That should allow the video to play to completion without delay. If not, then your graphics card may need an upgrade. If the card itself does not have sufficient on-board memory, the information needs to be refreshed from main computer memory which will slow things down.

Check those things first and update this with your results. There are other possibilities as well.

Thanks,
Dan

Jul 27, 2009 | Computers & Internet

1 Answer

All of a sudden I am not able to hear people - they can hear me. This is intermittent.


First, Hello! Second.

VOIP means Voice over IP, naturally VOIP is a realtime communication and there fore is prone to error. Let me explain in more detail.

TCP/IP (Transfer Control Protocol/Internet Protocol) uses two communnication protocols, TCP(Transfer Control Protocol) and UDP (User Datagram Protocol).

The TCP uses sequencing and acknowledment in order to start the connection, transfer data, acknowledge data arrives in order to send the subsequent data segment. In order word is like mail delivery with confirmation.

The UDP is like besto effort delivery. "I sent the data and hope you get it". Because the data travel many different ways in many Packets TCP send the data, but on destination arrives the segments in different order, The TCP puts them together, on realtime it will imposible to understand the other party in this way. So, this is why you sometimes you see squares or "error" on video streaming, because video is in real time, if you have to wait for all the packet to get toghether take toooooo much time.

So you have to check for Qos or resuce you transfers over internet while sepaking. On Wikipedia are very good info on Qos. Theres router with Qos integrated to ensure some bandwith is dedicated to VOIP transmissions. I Hope It Helps! Good Day!



Jul 02, 2009 | Hitachi WIP-5000 IP Wireless Phone

1 Answer

HI.I was watchinglive streaming but there is a eror sudenly.this eror:rtsp://78.129.143.64/broadcast/pull/81.31.32.47:2030/broadcast/pull/81.19.7.50:3051/stv3.rmvb Can you help me...


Streaming audio/video quality can be affected by connection rate and Internet congestion. Many types of interruptions between your computer, your player, your computer's OS, your local network, your ISP and a streaming server can exist and cause trouble....
When you listen to the live audio/video stream, the sound or video skips, cuts out or buffers if the player doesn't have enough network bandwidth, it will buffer. Try increasing your player's buffering setting.Also:
  • Make sure you are choosing the appropriate bandwidth version of a media stream based on your Internet connection.
  • Make sure you are choosing the appropriate bandwidth settings in an Internet media player or streaming audio/video recorder.
  • Make sure NOT to download applications or files while watching/listening to media streams. Your Internet connection is shared between all open applications including your web-browser, your download manager and your streaming player. Closing applications that use your Internet connection simultaneously with your streaming player may reduce buffering.
  • Close other unnecessary applications that may be open on your computer. Reboot your computer. If you have lots of other programs open, they may be using too much processor time and/or RAM for the player to work properly.
  • Make sure your Internet connection is fast enough to reliably listen to streaming audio and/or watch streaming video online. High speed Internet connection is recommended.
  • Make sure your computer is fast enough. If your computer is old, it might be too slow to play an audio/video stream regardless of what else it's doing.
  • Update your media players and streaming audio/video recorders regularly.
Internet congestion can slow down the delivery of the stream, make it difficult for you to connect or cause buffering. Often the interruption is temporary. Please try to connect a few times at different times of the day, if possible. If you repeatedly have problems connecting, please notify your ISP - there are often quick fixes they can make when they learn about your issue.

Try the above steps you will find a solution to your problem....100% it will work.....

Sep 18, 2008 | Computers & Internet

1 Answer

Actiontec router Outbound Traffic Blocked - NAT out failed


k first delete all temp files and cookies and clear history>and change teh dns to global one>i hope that u pinged with the web site have u tried ping with the ip address of teh web site>then here the way to change teh dns to static
start-->control panel-->and network connection-->right click on local area conn-->properties-->and high light the TCP/IP-->and click properties and u can see a dialog box>in that look @ the left side down u can see obtain DNS sufficx>and use the current following DNS select that and the DNS range is
4.2.2.1
4.2.2.2>and apply and ok>and reboot the pc>and check with teh web site iam sure its a dns issue>and rate me solved if its help full thx

Nov 04, 2007 | Computers & Internet

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