Question about D-Link DES-1008D 8-Port Ethernet Switch (790069217708)

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I have it two but they can't send packet between them.

Posted by Anonymous on

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Please provide more information as to you issue such as :
a. model number
b. year manufactured/firmware updated
c.Are you using router wirelessly or hard connected.
d. You have checked the user manual 1st?.
e. You have confirmed that you have connectivity with the ISP ( internet service provider).

Posted on Jul 12, 2010

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Posted on Jan 02, 2017

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1 Answer

Can the S2700 Switch Function as a Gateway?


The S2700 switch cannot be used as a gateway. The S2700 is a Layer 2 switch. If it is used as a gateway, it sends all packets that need to be forwarded at Layer 3 to the CPU to forward the packets through software. This causes a high CPU usage. Because CAR parameters are configured to protect the CPU, a large number of packets are dropped, affecting forwarding of service packets.

Aug 08, 2016 | 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

1 Answer

How can i activate packet data???????? it ******'


Can you be more specific please. Packet data is chunks of data that is input to the PC, like CD/DVD assemblies sending bits of data at a time.

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Definition


The definition of a Router is:

A Router is a device that connects two networks - frequently over large distances. It understands one or more network protocols, such as IP or IPX. A Router accepts packets on at least two network interfaces, and forwards packets from one interface to another.

Router's may be programmed to filter out some packets, and to dynamically change the route by which packets are routed.

Router's often use different media on each interface. For instance, a router might have one Ethernet port and one ISDN port.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
They are most common for in home use to connect multiple computers, as well as assign internet from one service provider modem to the router and in turn spread the wired or wireless signal to all networked computers in a household or office.

Hope this answers your question. :)
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for all the hard work to the Community! :D
~~Dayminner

Jun 18, 2011 | Computers & Internet

2 Answers

Internet setting


i m sending u some network's settings...
send me ur network's name ....i will send u thier settings

For idea-
account name-spicegprs
proxy - enable
use pref. access pt.- No
data bearer- packet data
packet data acc. pt. - spicegprs
network type - IPv4

For AIRCEL-
account name-aircelgprs
proxy - enable
use pref. access pt.- No
data bearer- packet data
packet data acc. pt. - aircelgprs
network type - IPv4

FOR AIRTEL-
account name-mobileoffice
proxy - enable
use pref. access pt.- No
data bearer- packet data
packet data acc. pt. - mobile office
network type - IPv4

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2 Answers

Packet data connection not awailable


Hi,
To subscribe to packet data you need to contact your service provider through phone or go directly to their office.
They will send you the settings for your model. Please save the settings to your phone and set it has a default settings.Then you can start using the internet in your phone.
Thank You

Aug 16, 2010 | Cell Phones

1 Answer

Activate free gprs


please i am using nokia 2600c and i have being trying to activate free gprs but it is not working, rather it will be writting packet data connection not available or subscribe to packet data first and link not available i want you to send me the manual configuration setting now in my inbox or through sms in my phone my phone number is 9937130474. I live in Dhenkanal district of Orissa state.

May 11, 2009 | Nokia 2600

2 Answers

Packet data


please i am using nokia 2600c and i have being trying to activate free gprs but it is not working, rather it will be writting packet data connection not available or subscribe to packet data first and link not available i want you to send me the manual configuration setting now in my inbox or through sms in my phone my phone number 00267 71731903, using mascom

Dec 27, 2008 | Nokia 2600

1 Answer

CANT SEND FAX THRU VOIP LINE


Make sure baud rate is set to 9600 and error correction mode (ECM) is off. If this does not correct your issue then you may have to contact your provider to adjust your sample rate (packetization). This adjusts the size of the packets and is often a common fix. You may want to run a ping/tracert from command prompt to check for latency and/or packet loss with your ISP. I'm a voip tech and these are the primary fixes for fax issues.

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