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My d-link ethernet switch does not transfer packets even if it is powered?

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Because Data transfer ic is damaged it can not easily changed.tha

Posted on Dec 14, 2008

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How to Configure Rate Limit on S6700?


How to Configure Rate Limit on S6700?
When you configure rate limit, the following configuration is recommended: Set the CIR, CBS, and PBS values but not the PIR value. CBS = 200 x CIR PBS = 2 x CBS = 2 x 200 x CIR = 400 x CIR The CIR value is expressed in kbit/s, and the CBS and PBS values are expressed in bytes. Set the rate limit for outgoing packets on the interface to 10 Mbit/s. [HUAWEI] interface ethernet 0/0/1 [HUAWEI-Ethernet0/0/1] qos lr outbound cir 10240 cbs 2048000Set the rate limit for incoming packets on the interface to 10 Mbit/s. [HUAWEI] interface ethernet 0/0/1 [HUAWEI-Ethernet0/0/1] qos lr inbound cir 10240 cbs 2048000 S6700 Switch Thunder link com

Nov 21, 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

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Cisco asa 5500 - sh interface - reveals switch ingress policy drops - what are these ? will they slow down traffic ?


The following is an excerpt from cisco.com defining policy drops and their possible causes:

This drop is usually seen when a port is not configured correctly. This drop is incremented when a packet cannot be successfully forwarded within switch ports as a result of the default or user configured switch port settings. The following configurations are the likely reasons for this drop:

blank.gifThe nameif command was not configured on the VLAN interface.

Note blank.gifFor interfaces in the same VLAN, even if the nameif command was not configured, switching within the VLAN is successful, and this counter does not increment.

blank.gifThe VLAN is shut down.

blank.gifAn access port received an 802.1Q-tagged packet.

blank.gifA trunk port received a tag that is not allowed or an untagged packet.

blank.gifThe security appliance is connected to another Cisco device that has Ethernet keepalives. For example, Cisco IOS software uses Ethernet loopback packets to ensure interface health. This packet is not intended to be received by any other device; the health is ensured just by being able to send the packet. These types of packets are dropped at the switch port, and the counter increments.

blank.gifThe VLAN only has one physical interface, but the DEST of the packet does not match the MAC address of the VLAN, and it is not the broadcast address


Throubleshoot these and see if any of them apply to you. Thank you for choosing fixya.com.

Dec 04, 2010 | Cisco (ASA-SSM-AIP-20-K9=) Firewall

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I am connecting 4 nodes through 2 switch located at 400ft distance. the data transfer is not working. 2 nodes are connected to each switch, both nodes connected to individual switch communicates with each...


Just to clarify, you have 4 computers connected to two ethernet switches. Two computers are connecteh to each ethernet switch and a network cable connecting the two ethernet switches 400ft apart.

For all the computers to communicate with each other, they all need to be in the same workgroup "name".
The cable joining the two ethernet switches need to be connected to the RJ45 UPLINK port on both the ethernet switches, and the uplink port may have a switch (the switch allows it to function as a standard RJ45 port or a RJ45 uplink port).
If there is no RJ45 uplink ports on the ethernet switches then a cross over network cable is needed to connect the ethernet switches together.

Oct 28, 2009 | D-Link DES-1008D 8-Port Ethernet Switch...

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Same thing as above, want to se up a LAN connection


Once you connect the 2nd switch - you must power down the cable modem and the original router along with all PC's connected to the network.
Then power up the cable modem,wait 2 minutes,
power up the router - wait 2 minutes, then power up all the switches. Once all downstream devices are on - power up all the PC's and you should be OK.

Sep 13, 2009 | D-Link DES-1008D 8-Port Ethernet Switch...

1 Answer

When use igrp?


First the IGRP is a Cisco protocol. And there is not a magic solution. Here some Info:
The Routing Problem IGRP is intended for use in gateways connecting several networks. We assume that the networks use packet-based technology. In effect the gateways act as packet switches. When a system connected to one network wants to send a packet to a system on a different network, it addresses the packet to a gateway. If the destination is on one of the networks connected to the gateway, the gateway will forward the packet to the destination. If the destination is more distant, the gateway will forward the packet to another gateway that is closer to the destination. Gateways use routing tables to help them decide what to do with packets. Here is a simple example routing table. (Addresses used in the examples are IP addresses taken from Rutgers University. Note that the basic routing problem is similar for other protocols as well, but this description will assume that IGRP is being used for routing IP.)
Figure 1
network gateway interface
------- ------- ---------
128.6.4 none ethernet 0
128.6.5 none ethernet 1
128.6.21 128.6.4.1 ethernet 0
128.121 128.6.5.4 ethernet 1
10 128.6.5.4 ethernet 1
72465a7.gif

Jul 03, 2009 | 2wire Computers & Internet

2 Answers

Single-line data transfer


No, a data transfer cable always need send and receive to be sure the packet of data are reaching the destination.

Sep 16, 2008 | Computers & Internet

1 Answer

Loss of link packets


Auto-negotiation, or duplex mismatch problems are common between 10/100 and 1Gb devices. Make sure the driver on your computer's ethernet adapter is up-to-date. If that doesn't help, you may need to try an inexpensive D-link or Linksys 10/100 switch.

Jan 08, 2008 | Edimax ES-5800S Networking Switch

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