Cisco :: Troubleshooting Iperf Results Over Infrastructure
Mar 19, 2013
I am working with a client who is adamant their backbone is fine. However, I am unable to get a single iperf connection to generate anything more than 9.5 megabit/s, and can go all the way up to 322 megabit/s with multiple streams before it looks like we are saturated. Note the example below for a single stream has a 1MByte window, with 8kb we were only able to see 2.4 mbits/sec per stream (as seen in the per stream in the example below). Where would you begin to look for why we cant seem to exceed 2.3mbit/s with an 8kb window, or 7.88 with a 1mbyte.
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Mar 2, 2012
I am currently using catalyst 4506 L3 switch and 2950 L2 switches for pc's which are EOL. I am replacing L3 with 3750X, two switches in a stack. L2 is 2960S all with gbps ports. I have to have a baseline (performance comparison with the current setup and new setup) and I am using the following methods
1. Iperf throughput comparison among local vlans
2. Iperf throughput comparison with remote data centers servers.
3. Ping/ftp upload/download comparison with remote DC's. FTP file is around 3GB.
Today I have tested the above with the new setup and compared it with the old setup. For the tasks 1 & 3 I found better performance with the new setup. However the task 2 did not show any performance increase infact the throughput was much lower comparing to the old setup.
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Aug 3, 2012
I have configured a few 3750G switches with trunks and I want to test the throughput. In your experience is iperf the best tool? If so what settings do you use?
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Feb 23, 2013
Troubleshooting a 137 error and other unknown errors I have been receiving for some time now.
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Jan 17, 2013
I have an authorization rule which verify that the AV (mcafee 12.x) is installed (NAC agent), time restriction and so, and so....The connection failed with this code :
15039 Rejected per authorization profile.
How can I obtain a some more details on that ?I mean, I'd like to know which condition is not verified and lead to a failed connection.
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Jan 21, 2013
I'm replacing a PA-POS-OC3-SM with PA-POS-1OC3 in a flex Wan module (WS-X6582-2PA) in Cisco 6506 using WS-SUP32P-GE PISA.I have a hard time bringing the "protocol up. the status I see is line up and protocol down. Debug shows (attached) no comunication with the edge router but when i put the older PA (PA-POS-OC3-SM ) back evertything works fine and older PA has been running for many years without the issue. I'm replacing older PA is becuase this is going EOL. I had opened a TAC case but the TAC engineer added no value. [code]
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Mar 2, 2012
We have 2 Cisco 4400 series WLC and a whole bunch of 1231G APs connected to it.Sometimes the wireless network get really, really slow.Does Cisco have any built in tools for troubleshooting bandwidth or sluggishness issues?And how does one go ahead and troubleshoot something like that?
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Sep 28, 2010
For years I have received occasional complaints about users being dropped from WiF and then reconnecting like a minute or two later. I wondered what tools people on the Forum used to troubleshoot this transient problem. Cisco APs like the 1200 don't seem to inform about why someone left. One thing that has been very useful over time is using Network Sumbler to see what WAPs are in a vicinity and make sure there is not channel overlap. How to troubleshoot transient wireless network drops?
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Nov 12, 2012
I have a ACE4710 setup to load balance a couple of web servers. The real servers all show as inservice as do the propbes and serverfarms/virtual servers. If I ping the Virtuual server ip address I get a reply but it I try to access VIP via telnet or web browser. I get a connection could not be open error on the client.The question is how do i determine where the error is comming from so far I can not tell if the client is getting through the acl or not.I have used the trouble shooting guide and nothing has worked to determine the cause so far. show service-policy int479 detail does not show an increase in the hit count when I try to connect.show stats conn does not show an increase in failed or timed out connections when i try to connect. [code]
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Oct 20, 2012
I am trying to access a government jobs page to apply for an internship. When I access the page from my home network (using multiple browsers and multiple computers) I get a result that references the job opening from last year, and doesn't have an application button. When I access the site using my 3G connection on my phone, or when accessed from any other internet connection, I get the new page which includes information about the 2013 job opening, and has an application button. When I try to enter the URL for the application page on my home network, I get a 404 error. If I turn my wifi off on my phone and reload the same page, it resolves to the correct page.
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Jan 10, 2011
I did a network test with Passmarks Performancetest. I'm running a 10/100 network with all devices connecting at 100Mb. On Performancetest there are 2 tests to run for Network speed, TCP and UDP. The TCP speed test came back with an average 62000kbps (7.5Mb), and the UDP was 89000kbps (10.8Mb). As I'm running a 100mb network, shouldn't the results of been higher?
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Mar 25, 2012
Just setting up and testing a Cisco 891-K9 router. Used CCP for basic setup, figure I'll tweak any settings needed later.For the firewall, I chose the default "medium" security setting in CCP, then added some holes (already setup in NAT) for outside access in.
Now on to the real question:I noticed that I am now unable to click through google search results. On any borwser. Clicking on any search result simply loops back around to the same google search page. If I disable Javascript on the browser, everything works as expected. So it appears that the firewall is preventing something in google's scripts from redirecting and "clicking through" to the final destination page.
I'm familiar with our old Pix firewall commands, but still a relative newcomer to the zone based firewall and commands for this new 891, (relevant Config pasted below) (Gi0 is the WAN interface)
!
!
multilink bundle-name authenticated
parameter-map type protocol-info yahoo-servers
server name scs.msg.yahoo.com
server name scsa.msg.yahoo.com
server name scsb.msg.yahoo.com
[code]....
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Nov 23, 2011
I have a ASA 5505 as a default gateway to a network, whenever I tracert to outside it shows every hop ip address as the ip address I'm trying to get too, quick example
lets say I'm in a 192.168.0.0/25 network but I want to trace to 10.10.10.10
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May 28, 2013
I have an older windows xp computer, xps 400.
I had unplugged my computer due to painting the room. When i plugged back it I couldn not connect to internet. But oddlly enough my mcafee security center gave me a message that mcafee subscription expired, which it can't as I use it through my subscription through aol. Had this problem once before. So i uninstalled mcafee. I ran malwarebytes to see if there was anything that might prevent me for accessing internet, it found two adware that I quarentined.
I have tested my ethernet cord and connectivity on another computer it works fine.I had a realek RTL8139 Family PCI Ethernet NIC, i reloaded the driver after downloading from my other computer, now it say it is a realtek RTL 8139/810x family ethernet nic, not sure if I downloaded the wrong driver but before that I tried changing the speed to less than auto detect.
I have rebooted in safe mode in case there was a virus. I am at my wits end.Is there a way to factory reset the network adapter. What else can I do. light at the ethernet port looks to be yellow. Everything says it is working, I just can't connect.
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Sep 23, 2011
I'm using an Acer Aspire 5532 and just recently set up my own network with my Cisco WRT120N router. I used the installation disc and set up a WPA password, named my router, and my network. For the installation, it seemed I could not even start without physically linking the router to my laptop with the included rollover cable. I finished that, and ever since my wireless adapter has been disabled. Whenever I attempt to enable it, I get an error; my laptop shuts down and I'm presented with blue screen. The only way I've been able to get back to normal is to reboot in safe mode and than do a system restore.
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Jan 11, 2012
I have 100mbps connection but when i took the test at speedtest.net it was so slow i don't understand whats bottle necking my system. When i download games off of steam it downloads its much faster then downing anything from my browser. I know its my network because when i went on steam and changed my download settings to cable and it was fixed.
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Feb 28, 2013
I'm trying to block access to dropbox.com on our ASA5510. I have it setup and it blocks dropbox.com just fine. But it is also blocking google.com. I can't figure out why.
Here's my config. When it blocks google, it blocks it with the terminated by inspection engine, reason - disconnected, dropped packet.
regex Block_Dropbox ".dropbox.com"
access-list URL_Filtering extended permit tcp any any eq www
access-list URL_Filtering extended permit tcp any any eq https
[Code]......
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Oct 31, 2012
I have linksys E4500 and I would like to be able to see the website visited vs ip address.Is there a way to enable same or achive same via parental controls.Again I do not want to block a website but monitor which websites are visited. Is this achievable via router or an additional software/hardware required to be used with router
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Sep 11, 2012
Just did a dot11 radio link test on a point to multipoint 1400 series bridges. how to read the results of the test?
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Dec 12, 2011
Why does the sx300 series only displays ping and traceroute results in 20ms intervals (see below)? The example in the CLI manual shows "regular" results. These 20ms intervals are not useful for troubleshooting. This is version 1.1.0.73 on an sf300-24. [code]
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Sep 18, 2012
We have a design of two 6509 running in a VSS with dual supervisor each having fthree 10/100/1000mb etherner modules. We have diagnosed a wierd problem that none of the switchports in module 1 and 2 on either switches are having layer2/layer 3 connectivity.
Tried everything from changing the cables to changing the end device but no luck with it.
Module results show pass and no errors in the logging.
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Jan 8, 2013
What is the difference between RPS 300 and RPS 675?
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Jan 19, 2012
what is the use SPA and SIP...in router hardware ? What if we do not have them ?
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Sep 25, 2012
I am managing a Cisco 881 with Adv Ip Services ( CISCO881-SEC-K9). It has IOS 15.0(1) M8 on it. I see that there is a new IOS version 15.2M&T that (I think is applicable), and I have read the upgrade procedures for upgrade via USB and TFT.
If I install it will my license for Adv Ip Services be preserved or overwritten. And if the latter, do I need to export it and reapply it? If so, what is the process?
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Jul 31, 2006
I have an ME2400 running private V LANs. The primary V LAN is 20 and the secondary V LAN's are 21 and 22. Currently, management traffic is still on V LAN 1. My question is now that the ME2400 does not have anything plugged into v lan 1; the line protocol goes down, which means that I can no longer access the switch remotely. Is it possible to keep a SVI up up even though nothing is plugged into that V LAN? If so, how do I go about doing this?
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Sep 25, 2012
My company purchased a PAK for ASA5505-SEC-PL a while back. I found it unopened and need to know if it can be used, without activating it on an ASA. I opened up a case with the Cisco TAC, provided them the PAK serial number and got the following responses from 2 different individuals:
1.Since the product was covered under warranty and then expired this means that the activation key was used before.
2. This PAK number is expired since (Warranty End Date 21-Feb-2009).
I responded that I am not interested in warranty information but I just want to know if the PAK can be used. Just because the warranty expired, does that REALLY mean the PAK can no longer be used? That doesnt make sense to me. Isn't there a tool on Cisco's website to put in the PAK S/N to see if it is available, has been used, and if so, when?
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Mar 24, 2013
I need to use:
track 1 ip sla 1 reachability
In my 4507R core switch. Need to know which IOS should I use for this command as now I am using
cat4500-entservices-mz.122-46.SG.bin
In this when I am using
(config)#track 1 ip ?
route IP route
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Mar 30, 2013
What is the difference between ASA-SM1 and FWSM and what is the throughput of it?
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Feb 22, 2012
I need some fiber to run between a Cisco Nexus and an IBM server with Intel NIC. It's 30meters, and LC-LC connectors.What is the difference between 62.5/125 vs 50/125?
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Nov 28, 2011
Is there any difference between these two models from hardware standpoint?
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Jul 4, 2011
I am going to be updating the IOS on our Cisco ASA 5520 from verion 7.0(8) to 8.2(5). I am also going to setup AnyConnect. Are there any major changes in the 2 IOS versions that I need to be aware of or will the config work in either version? Also, we are currently using the Cisco VPN Client to connect to our network. Will that still work after the upgrade?
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Jul 6, 2011
Is the configuration information for each of the access points that has joined a wireless lan controller stored somewhere specifically in the configuration screens? I enabled the power injector override on one of my access points which is plugged into a POE switch and of course now it will not stay up for more than a few seconds. Therefore I cant just go to the wireless list and modify the configuration there. I cannot seem to find it anywhere else to change it and bring it back up.
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Apr 9, 2013
WCS 7.0 to Prime Infrastructure 1.2 migration?I am so confused on the migration procedure as I found the documents in Cisco kind of contradictory.Some document said it is required to upgrade WCS to NCS 1.1 before to go to prime infrastructure 1.2.And the other document said WCS can directly upgrade to prime infrastructure 1.2.
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