Cisco :: Testing Link Using High IP MTU?

Apr 27, 2012

I always test ethernet family links(E, Fa, Gi) sending pings with MTU equal to 1500. Since most hosts uses MTU 1500 I think is not necessary to test using a high MTU size like 18024.

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Cisco WAN :: PA-MC-T3 - Testing Of New MPLS Link

Nov 17, 2011

I have done a bunch of research in trying to re-use an old card/router for testing our new MPLS link. I have a 45m DS3 and was wondering if the PA-MC-T3= card will work UN-channelized. I have tried the "no channelized" command under the controller to no avail. I believe that the card only works for channelized T1's.

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Cisco Firewall :: ASA 5510 7.2.1 High Traffic On Outside Interface Very High Input?

Oct 13, 2011

Today I've received reports of slow internet access/activity and have noticed myself that it seems a bit slow today.  On the dashboard of our asa 5510 the "outside interface" traffic usage is running constantly high. It's at the top of the graph. How can I tell what is causing the spike in utilization. It usually runs at about 1500-2000 Kbps, and now it's up over 10,000.

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D-Link DIR-655 :: WRT54GL High Ping Over Wired Connection

Oct 18, 2011

Since buying and using this router about 1 month ago, I've had latency problems. With my Linksys WRT54GL, my latency has always been consistent. However, pinging to google (as a benchmark), my ping is a good 50-70 higher than directly plugging into my router. Directly into my modem I get 10-20ms pings; through the router, I get minimum 60ms up to 100ms spikes. When using the Linksys router, my ping would be 20-30s. I really hope it's just a settings problem. I've turned off QoS and wireless to isolate the connection to just wired, but it still persists. I really hope I can fix this problem, else I am going to buy a different router over the weekend. I can't play FPS games like Bad Company 2 with such high latency.

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Cisco WAN :: 2801 High CPU Load / Low Traffic / High Interrupts

Nov 26, 2012

We installed a solution with 2 Cisco 2801, BGP multihomed failover.
 
1) The router which is currently getting all the traffic gets to 55% to 60% of CPU usage when handling 40 SIP/RTP streams . This equals 10Mbit up/10Mbit down and it showed around 5800 packets TX and around 5800 packets RX, with a majority of them CEF switched. As those figures are way less than the performance figures published by Cisco, we wonder if we made any mistake in setting up our router, or if we can do something to improve the router setup.
  
2) Does it have an impact on router performance if we increase/decrease RTP packet size, thus increasing or decreasing the pps relative to the consumed bandwidth?
  
3) If it is not possible to improve router configuration, we also wonder about possible replacement units for those routers. Would a 2901 do a good job? By how much would it rise the capacity? What other models would you recommend if we plan to rise the number of concurrent calls by a factor of 4 or even 8 times of what we have now (so up to 48000 pps and 80Mbit).
  
Here is what we tried:

- ip route-cache same-interface does not seem to improve anything

- ip flow ingress on or off makes no difference

- disabling the inbound ACL on fa0/0 seems to reduce load by 10%, although I don't understand why - a very high percentage is CPU interrupts, and ACLs are process switched, or not?

- we tried following the Cisco guide for high CPU due to high interrupts, with no success
  
Here are some usage statistics: 
 
The graphs that we plot via SNMP show a propotional growth/increase of CPU and bandwidth (and thus pps) At the highest loads, we had a bit more than 55% CPU utilization with more than 50% interrupt CPU.
 
CPU utilization for five seconds: 36%/30%; one minute: 30%; five minutes: 30%
PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
127       13140         954      13773  2.00%  0.29%  0.07% 194 SSH Process  

[Code].....

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D-Link DIR-825 :: High Ping Spikes When Enable DNS Relay Is Ticked

Apr 30, 2013

I was having very high ping spikes (up to 2000ms) in my online gaming. I even had high spikes (up to 80ms) just pinging my router. It happened with every computer on the network. After several weeks, I narrowed it down to one thing: Enable DNS Relay. I unticked that, and instantly the spikes went away. However, my brother's Blackberry Playbook has been acting up now that DNS Relay is disabled. Basically, every day, the internet on that thing screeches to a halt, forcing him to reconnect to the network. It's basically a minor inconvenience, but it's one I want to correct. If I turn on DNS Relay again, the ping spikes will return. Interestingly, I switched ISPs during this time. I'm on cable now. I used to be on DSL with a different router, yet I had the exact same problem. The blackberry is probably integral to this problem. So I'd like to know if there's anything I can do to make DNS Relay work properly, allowing his stupid Blackberry to work, while maintaining the integrity of the network.

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Difference Between High-power And High-gain In Wireless USB Adapters

Nov 12, 2011

what's the difference between High-power and High-gain wireless USB adapters.

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Cisco :: Testing ACL With Ping Command?

Sep 11, 2012

why using ping to test the functionality of an ACL could proove insufficient?

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Cisco WAN :: Lab Testing Of WIC-T1 On 2921 Routers

Mar 6, 2012

I have a lab setup and I want to test a point-to-point connection between two 2921 routers in a lab environment, without going through an ISP. I have a HWIC-1DSU-T1= in each of the routers. I have already configured ip addresses to the router interfaces, eDo I need to set any CLOCK RATE or BANDWIDTH commands or anything like that, since my traffic will not actually be going through an ISP during this lab test?

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Cisco WAN :: 2811 - PBR Testing Is Not Working

Mar 15, 2011

I am deploying PBR at the moment in a simple configuration. The 'ip policy' is applied to a sub-interface on a 2811 and all ACLs and route-maps look good. I am using NAT also in this configuration. It is a very simple build, basically stating that all traffic inbound on this sub-interface is to use a next hop of x.x.x.x
 
My testing is not working, but i need clarity on this. For different reasons, i am not able to tests with hosts on the relevant VLAN yet, as there is not. So i am testing on the local router using the sub-interface as the source IP. i.e. 'ping 8.8.8.8 souce int fa0/0.99' or telnet www.cisco.com 80 source fa0.0.99
 
Nat appears to be working, but my debug on ip policy is not showing any hits. Will my tests work when i am sourcing packets from the locally connected interface?

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TP-Link 300Mbps Wireless :: TL-WR841ND - LAN Freezes With High Bandwidth Usage

Jan 13, 2013

Region : Romania
Model : TL-WR841ND
Hardware Version :
Firmware Version : 3.13.27 Build 121101 Rel.38183n
ISP : cosmote

hardware version is WR841N v8.wireless works just fine. i use it for my smartphone and an old laptop. i use ethernet cable to connect to main computer where all is ok until i start using my bit torrent client. as soon as i build up traffic above 1MB the ethernet portion of the router freezes and needs a reboot. when frozen, wireless is still working and i still have access on the lan to the router via my browser. i got this router so i could have wifi for my phone. my old router (asus rx3041) worked just fine and i accessed my isp at the maximum speeds it would allow on a 60 gigabit connection.

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VPLS Testing Missing Something

Dec 13, 2011

My company is moving the datacenter to our new building on Saturday, however the users will remain at the old building until late next month so they bought a 100M Metro E VPLS circuit through their ISP. I went to test it today but could not ping the workstation from my laptop. I wanted to do some bandwidth testing with iperf but could never get to that point because ICMP connectivity wasn't even there. From what I understand, VPLS is just a layer 2 extension so they way I'm testing the circuit below SHOULD work, but it isn't. Spoke with the ISP and they tested the circuit end-to-end on their equipment which was fine so am I missing something?

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Open - Wireless LAN Testing?

Jun 14, 2012

how can i check my wirless lan card, i have a wireless internet connection at home but now a days i am getting low speed on laptop and signals on the wireless device are full but on my laptop i am getting less signals.

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Cisco Firewall :: 2911 - Control Link In Zone-Based Policy High Availability

Jun 26, 2012

I have set up a zone-based policy firewall with HA on two 2911 routers as per the Cisco security configuration guide, for an active/passive LAN-LAN cluster. All works as expected, but there is one problem I find: when the control link between the two devices fails, they go into an active/active state as each member assumes it's the last surviving member. The ARP entries for the Virtual IPs on the neighboring devices point to the device that last claimed the active role (usually the standby device). This works in a way, just sessions don't get synched anymore (control link is the same as data link). Now when the link comes back up, the preemtion works and the active, former standby device goes back to standby. But the ARP entries on the neighboring devices still point to the standby device and nothing goes (also sessions established during the active/active state are lost due to resync with the now active member).
 
This is a single point of failure and what I need is a way to mitigate that. Under:

redundancy
application redundancy
group 1
control <interface> protocol 1

only one control interface is allowed. Other manufacturers with similar functionality provide for the possibilty of a backup control link, for example the internal LAN interface or a dedicated backup link.
 
How would I go about that? Maybe use a port-channel for the control/data link (but I'm out of interfaces)?

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Cisco - Best Way To Perform Basic Router Testing?

Jul 17, 2012

I work for a company that buys used cisco equipment and we are trying to get a basic test center set up. What is the best way to perform basic router testing? We have been trying to come up with something for about 3 weeks and so far all we can do is get in the configuration and play around.

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Cisco :: 3750 - Testing A Fibre Connection

Mar 27, 2013

I have a Catalyst 3750 router and would like to know if this can be setup to accept communications from a storage switch which uses a fibre path to then send the signal onwards to some test equipment which uses a copper ethernet connection.

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Cisco WAN :: Loopback Testing On 2610 Router

Jun 22, 2011

I am working at a client site today.  The client has a large Frame Relay Hub Spoke network.  The Hub is at the HQ location, and then there are about 15 spoke sites in remote offices.
 
We are having an issue with the frame between the HQ and one of the spokes.  We are currently working with our dear friends at AT&T to troubleshoot the issue.  AT&T yesterday was trying to run a local loop test to the router at the remote (spoke) end.  We were working iwth them in trying to put the remote router (which we manage) into a loopback mode.  We were trying to use controller commands
 
COOP-Rappahanock#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
COOP-Rappahanock(config)#controller ?
% Unrecognized command
COOP-Rappahanock(config)#controller
 
That we seem to run out of options...
 
How can we put the subinterface that is the other end fo the frame into loopback mode so that a local loop test can be done between us and AT&T (provider)?

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Applications For Testing Line Quality?

May 25, 2011

We are having issues transferring a 200GB VHD file across our point to point without being corrupted in the process. Any good application for testing the line quality across the point to point?Preferably we want something free, but if there is an in depth tool that costs money, we are open to that option as well.

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Testing Websites From An External Connection?

Feb 28, 2013

At our small business I would like to be able to test connecting to some of our websites as an external IP address user outside of our network although still being physically connected to the internal network. Any thoughts on the simplest way to set this up? I have the capability to setup vlans on our switch, could I make one of the vlans/ports have an external connection instead of an internal?

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Testing ADSL Synchronization Fail?

Jan 3, 2013

I have 2 routers on 1 the internet work fine on the other the internet not work and I see this when I start diagnostic "Testing ADSL Synchronization---fail"

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Purpose Of Loop Back Testing

Aug 12, 2011

What is the purpose of loop back testing.

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Cisco WAN :: 2610 Testing Out Frame Relay Connections

Mar 13, 2012

I'm looking to test fram relay connections in a lab environment i'm building at home. I have a couple of 2610 routers that are barebones and am looking to get some serial modules. Are (2) WIC-2T's all I would need to create those test connections? Also on a side note are the any modules for the 2610 that have fast ethernet connections. I would like to have that so I can create a router on a stick model off of the 2600's.

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Cisco Firewall :: ASA 5540 Want To Ping Across Inside To Outside For Testing

Sep 27, 2012

ASA 5540 8.2 (5)I have tried many combinations of command line syntax suggested in this forum but none are providing success so far.
 
I want to ping from the Inside Interface across to the Outside Interface and visa versa.I have tried various ACLs as well as "inspect icmp" in the config, etc still no go.
 
I can ping each interface from the console command line but cannot ping across each interface. [code]

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Cisco Firewall :: ASA 5520 8.4 Failover Interface Testing?

Jan 3, 2012

From ASA 5520 we tested the interface failover it not working even the interface are getting monitor . 
 
primary is active.
 
Manually we shut the outside interface of the primary device configuration is getting reflecting in secondary as outside interface shut. Interface failover not happen.
 
ii All the interface are getting monitor when we gave command sh failover. even though when we shut outside interface failove not happening.
  
how to do the interface failover in ASA 8.4 version.

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TP-Link ADSL2+ Wireless :: TD-W8951ND Generating High Data Usage With No Devices Connected

May 3, 2013

Region : UnitedKingdom
Model : TD-W8951ND
Hardware Version : V5
Firmware Version : 22.05.2012
ISP :

I have a TD-W8951ND v5 on the latest firmware.

I recently broke my broadband data cap which surprised me as I had not been using the internet much.

I only have tablet which I switched off having first checked the router to make sure there were no other wireless connections and adding MAC address filtering to be sure no one else was stealing my bandwidth. With just my router connected to the ISP, my ISP has recorded 170MB of downloaded data in 3.5 hours. Switching off the router stops the traffic being recorded (as you would expect), but when switched back on the large data transfers start up again.

I have plugged in an older router (not wireless) and no traffic is generated, so it seems to be the TP-Link router rather than my ISP or ADSL circuit that is at fault.

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Broadband :: Cable Testing Color Coding?

Mar 3, 2011

i want to know more about cable testing color coding

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Network Packet Generator Testing Tools?

Apr 23, 2012

I have been in this field for a few years and I found this book, Network Performance Toolkit: Using Open Source Testing Tools, to be very useful. It is full of great open source testing tools and has easy to use instructions for them all.However, to be more specific, I am looking for a packet generator that can simulate network packets over an extended amount of time. So the end result is I have this generator test my physical network for an hour but it simulates a week of real network traffic. Any tool, ideally it be open source?

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Linksys Wireless Router :: Testing QoS On New E3000

Apr 19, 2010

Has anyone tested QoS on the new E3000? Whenever I add an application (e.g. Voice Device) and set priority to Medium or High, my upstream bandwidth for everything else is immediately cut significantly, even when I'm not using the priority application. 
 
For example, with QoS disabled, I can consistently get 10Mb upstream (speedtest.comcast.net).  As soon as I enable QoS, upstream is capped to exactly 2Mb! On my old router, there was an option to set the total upstream bandwidth -- but on the E3000 there is no such option that I can find.  

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AAA/Identity/Nac :: ACS 5.2 - Disable Logging Of Testing User?

Apr 30, 2013

I am looking for the way how to disagle logging of one user. We are using one testing user for checking accesibility of ACS from large number of switches - this checking exhausting logs quite quickly. Is it possible to disable logging of such user?

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Cisco Switches :: How To Use SG-300 Combo Ports For Loop Back Testing

Sep 5, 2011

I've got an SG300-10P switch and am trying to use it to create a testing environment for a Fiber Test set. What I would like to do is get two hosts, A & B, plugged into ports 1 and 3 on the switch, to talk to each other, but forcing the traffic to be routed through the two Combo ports 9 & 10. Please see the attached diagram.I've attempted to configure two VLAN's, 10 and 20. Vlan 10 is used for traffic between Ports 1 and 9, Vlan 20 is used for traffic between Ports 3 and 10.I don't really care whether the traffic is tagged or untagged as it passes between ports 9 and 10.
 
I've tried various combinations of tagged/untagged ports, PVID's, etc. As a first test I've bypassed the Fiber Test set and simply created a direct connection between ports 9 and 10.  I am unable to get the traffic from Host A to Host B to get routed through ports 9 and 10 (I ping each host from the other and get no response).

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Cisco AAA/Identity/Nac :: Testing OCSP Servers For Certificate Validation On ACS 5.4

Mar 14, 2013

I'm currently having issues testing OCSP servers for certificate validation on ACS 5.4. Server team claims everything is fine on their side, but all attempts result in the following error:12562  OCSP server response is invalid
 
I've already tried to disable NONCE extension support and signature validation, which hasn't really had any effect. How to debug OCSP processing or look into the problem more precisely another way?

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Cisco Firewall :: Testing 5515x At Home - No Internet Route

Apr 15, 2013

im new to cisco asa and the model is 5515x with license plus.  below is my config at home,
 
ciscoasa#
ciscoasa# sh run
: Saved

[Code]......

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Best Open Source Website Load Testing Tool

Feb 13, 2013

what is the best open source website load testing tool?

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