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Questions tagged [testing]

For all questions involving testing of network devices or in relation to testing in computer networks.

-1
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0answers
11 views

Is it possible to simulate a cable modem connection? [closed]

I am trying to setup a test network. I want to provide an equivalent to a cable modem connection without actually having a cable connection. The reason is I have a dd-wrt modified router I'm trying to ...
1
vote
2answers
96 views

Confused about the results from the cable tester

A little bit of backstory, just in case you want some context. In the last couple of weeks the network at least internally has slowed down. As far as I can tell the only things that have changed has ...
1
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0answers
48 views

Simulating TCP/IP Illustrated Test Network [closed]

I just recently bought TCP/IP Illustrated volume 1 first edition for cheap and I see that they reference a test network throughout the book that looks like the following Now I'm not the sharpest tool ...
1
vote
1answer
59 views

Feeding a PoE capable device with variable power supply over TIA568 A cable (DC spares)

The purpose of such a variable power over Ethernet supply would be to test network equipment that are receiving power over PoE under condition of conditions of low voltage or current and determining ...
2
votes
2answers
311 views

How to test if an sfp is working on juniper qfx5100

How to test if an sfp is working on juniper qfx5100 My manager asked me to test if a 3rd party sfp is working on juniper !! what tests can i run on it to compare different company test equipment ? ...
2
votes
1answer
4k views

Iperf results on UDP Bandwidth

I am currently testing iperf with a view to automating some testing servers for our company. To do this I am using an iperf server in the cloud which is well connected and is only 5 hops away from ...
3
votes
1answer
103 views

What binary prefix, JEDEC or IEC, is used for calculating networking gear speed

What is the common practice of calculating a speed of an ethernet enabled device, and which standard (IEC or JEDEC) is used? I'm developing and testing a product that is interconnected via ethernet. ...
5
votes
2answers
1k views

WiFi TCP iperf throughput: upstream vs down stream

In a WLAN iperf3 TCP throughput test, I have the following results: With exactly the same setting, operation in 802.11ac (3x3) (DFS channel) (TCP Cubic) 30 nodes as server receiving iperf -> ...
2
votes
1answer
45 views

How to test the maximum of clients connected to an AP?

Is there a way to test how many clients can connect a given AP BSSID using a laptop or a dedicated device? I want to know that N is my real concurrent number of clients​ connected, and when N+1 ...
1
vote
1answer
288 views

How to duplicate multicast source over several multicast addresses

I have a single Multicast source which I would like -for testing purposes- to duplicate over several Multicast addresses, e.g. an host sending packets to 239.0.0.1, I would like the same traffic to ...
3
votes
2answers
1k views

What are the most common scenarios in which the 'loopback interface' on a router is used?

I was studying about CISCO routers and we learned that every router has a LOOPBACK interface. How and when are those interfaces used? We never used it though in our configurations.
1
vote
1answer
54 views

How to test outoing traffic on random ports? (on OS X) [closed]

In some situations or on some locations, I'm struggling with restricted outgoing traffic. For example a restricted LAN where outgoing traffic is only allowed on limited ports. I know how to check or ...
1
vote
1answer
299 views

Simulate a proxy or server that is silently dropping pooled tcp connections?

We have a system whereby we make a RESTful callback to a client's remote server. We are seeing timeouts waiting for a response when a request has apparently been sent. Some constraints: it is ...
0
votes
1answer
3k views

GNS3: performance tests using iperf3? [duplicate]

I'm running some performance tests on GNS3 (I know I shouldn't, but it is not until Friday that I will have the college lab available), and I'm trying to compare real BW or "speed" and theoritecal. ...
1
vote
1answer
316 views

How can I test my ping application for proper detection of ICMP return types and codes [closed]

I have developed an application that partially replicates the functionality of the builtin ping application, essentially sending an ICMP packet, receiving the response, and parsing the header. ...
-1
votes
2answers
52 views

Do routers and networks have have a “max threads” configuration? [closed]

I've been stress testing my application now and I've identified a high average network connection time. This is odd because I haven't gone over the max bandwith at all. What can this be caused by? ...
0
votes
2answers
327 views

Testing local network speed

We've inherited an existing network that is a mixture of a cat5e, cat6, with switches and rj45 couplers that tie everything together. Is there a way to test a local network speed from one side of ...
0
votes
2answers
103 views

Wireless network testing software [closed]

I want to be able to check the speeds / throughput on my LAN, check for signal strength, interference, dead spots etc. How do I do that? I'm having some issues with my wireless, particularly with an ...
2
votes
4answers
926 views

What is the difference between uplink and downlink (JMeter)?

I am trying to create a load test with JMeter, and what I want to do is to limit the bandwidth to 200mbit/second. I have two options, which are "Network Bandwidth Downlink" and "Network Bandwidth ...
4
votes
3answers
5k views

How to extensively test an ethernet switch

I have a Cisco SG200-26, and it appears to cause random network problems like timeouts, etc. Error logs on the switch do not indicate any problems. I replaced the switch with a different switch, and ...
1
vote
0answers
15 views

Could somebody that has worked with ePolicy Orchestrator in VMWare provide a high level overview of the roles in the stack? [closed]

E policy Orchestrator (EPO) is a McAfee product that manages AV MOVE apis. The EPO server works in conjunction with ESX and vcenter. VISUALLY I don't see the workflow of this entire process very ...
0
votes
1answer
3k views

How do testers (i.e. Fluke) get the port they're connected to?

At work I've been tasked to create a program that acts similar to Fluke testing devices (such as LinkRunners) but will be much more extensive and specific to our needs. One of the capabilities that ...
5
votes
1answer
1k views

Multiple VLANs with same subnet behind single ASA

Suppose you have three groups of servers on the following VLANs and subnets: Name VLAN ID Subnet ----------------------------------- Production 3 10.0.0.0/24 Test 103 ...
2
votes
1answer
674 views

Firewall Benchmark- Concurrent connection metrics

I intend to perform a Firewall Benchmark. I have reviewed related research papers and RFCs to create a suitable methodology. I have also examined open-source tools useful for the project (iperf, ...
5
votes
4answers
11k views

Iperf 'set bandwidth' command issues

I am unable to set the bandwidth on both sides using the Iperf tool. When I use the command iperf -c 192.168.1.15 -b 10m -l 32k -w 128k I get this error: --iperf: ignoring extra argument -- 10m --...
2
votes
1answer
134 views

Ttcp specific question

A TCP server has IP address 10.0.7.2 and a TCP client has IP address 10.0.7.3. The TCP server is waiting on port number 3333 for a connection request. The client connects to the server and transmits ...
3
votes
3answers
22k views

Sending generic UDP traffic for Network Simulation

I need to test an application which drops a user-specified percentage of packets. Right now, it will drop any packet type which I can easily verify by sending pings and observing the ICMP messages in ...
1
vote
1answer
414 views

How to test dynamic channel selection (DCS) with LANforge?

I would like to test the dynamic channel selection (DCS) feature of an access point AP. How can I test it using Candela Technologies LANforge-WiFIRE WiFi traffic generator? Would the following steps ...
3
votes
1answer
3k views

How to test Wi-Fi Multimedia (WMM) QoS management with LANforge?

I would like to test the Wi-Fi Multimedia (WMM) feature of an access point AP. How can I test it using Candela Technologies LANforge-WiFIRE WiFi traffic generator? Some thoughts after reading the ...
12
votes
3answers
20k views

Wifi TCP iperf throughput: 1 stream vs multiple streams?

In a WLAN iperf TCP throughput test, multiple parallel streams will give me higher throughput than 1 stream. I tried increasing the TCP window size, but I still cannot achieve the max throughput with ...
6
votes
2answers
7k views

Simple Question: Does High Bandwidth usage affect Speedtest.net Results?

In an office building with 20-some employees, our internet service sometimes drops to about .3 Mbits/sec from 5 Mbits/sec. I use speedtest.net to test the speed. When the speed drops, how can I tell ...
11
votes
1answer
7k views

Traffic generation from Cisco IOS device to prove WAN circuit

In essence I want to know if there is any way that we can use extended ping or any other command variants to prove to the customer that that the circuit is able to achieve the minimum CIR. The CE ...
14
votes
2answers
1k views

Simulating a poor network

I'd like to set up a poor wifi network in my office for developers to test on. What is the best way to simulate real world crappy wifi? High latency? Dropped packets? low bandwidth?
12
votes
7answers
3k views

Accurate strategy for measuring point-to-point link performance?

I have a requirement to provide an accurate means to demonstrate line performance over a flat layer2 1Gb point-to-point Ethernet circuit, approx 100 miles apart that seemingly goes through a number of ...
22
votes
10answers
23k views

How to generate traffic for lab scenarios [closed]

I'd like to start exploring QoS, and lower level optimizations for things like broadcasts/multicasts within my home lab. I've looked around for ways to generate traffic to and from a box, but haven't ...
4
votes
2answers
4k views

Cisco: No autostate on GigabitEthernet interfaces, any alternative? (not working)

I recently tried the command "no autostate" on a GigabitEthernet interface (on a newer router) and this didn't work anymore, does anyone know why this is occuring? This use to work on FastEthernet ...
23
votes
2answers
2k views

Emulate Ethernet frame loss for testing purposes [closed]

Maybe I am missing something rather basic, but I don't know so I figured I would ask. In terms of testing, how sensitive various TDMoE are to BER and packet delay, I am looking into how to simulate ...