Cisco Wireless :: LAP1042N - Throughput Calculation On 802.11g
Jan 30, 2012
I'm doing some throughput calculation test between a wireless client and a wired desktop computer, and I'm a bit confused about the result i've got. According to the client's card and the WLC, the client is connected to 802.11g, at a speed of 54Mbps. To perform my test, i'm using IPERF (available here [URL) The result is as follow:
As you can see, i'm far away the maximum theorical speed of 802.11g. Any software wich is able to test the throughput of a connection? The client wireless card is a Dlink DWA-652 and the wlc is running code 7.0.116, the AP is a cisco LAP1042N.
We will need to implement a small temporary wirelles solution where I will not have enough time to get a controller. We already have spare AIR-LAP-1042N-T-K9 that may be used (not configured in H-REAP as we use to do). If we configure these access point in local mode do they work without a controller ?
i'd like to force the speed/duplex of the integrated Gigabit interface on a LAP1042N, managed by a 4402 running software version 7.0.98 but I cannot find the command either by command line or on the GUI.
I`m trying to come up with a couple of equations to determine the characteristics of residential networks.Basically, what I`ve got so far is that the bandwidth is determined by the interval in which PSACR (power sum attenuation to cross talk ratio) has a positive value.I do realize that bends in the cable will modify the impedance and thus modify the twisted pair characteristics.So, what I am looking for are the equations that would give me length and bend (corner) dependencies (for example, if I have a 130m link that has 4 corners, my link will have a bandwidth of X,attenuation of Y and max data rate of Z).
I've been playing around with the Cisco RV180s for a while now and have come across a problem with the subnet calculation in the static routes and routing table. Essentially, if I configure up a static route for a /16 it's entered in the routing table as a /13. If I add a /24 it's entered in the routing table as a /16. I haven't tested every subnet size and combinations but this looks like a fairly fundamental maths bug.
As a side note, I notice that the 1.0.1.9 release notes state the removal of SSH Server, however, I can not find any reference to it's existance prior to 1.0.1.9, did/does it exist in 1.0.0.30 and if so where? .
Screenshots are below and an extract from the configuration file for reference.
On a pair of my CISCO7609-s (engine:sup720-3B IOS Version:12.2(33)SRD4),some interfaces is configured as routing interface but also them are attend MSTP caculation and i really caught BPDU packet go out from these ports. [code]
If I do a speed test (bandwidthplace.com) while connected to a remote locations 1140 standalone access point, the download/upload speeds are roughly 100kbps. There are no other devices connected to the access point at the time. Wired PCs on the LAN that the access point is connected to are not having a problem.Pings from the laptop, through the access point, to our central WAN router are at <10ms.The WAN circuit (remote location to headquarters) is 5Mbps. No congestion.Circuit out from headquarters to I'net is 50Mbps. No congestion.Access point and router interfaces show no errors or collisions, etc. The configuration is the same as 28 other standalone access points in 28 different LANs on the WAN. They have no problems.
What is the maximum throughput of a 2600 AP when using CLient Link 2.0. I see that the datasheet states that it is 450mbps, however, from my understanding of transmit beamforming (client link 2.0), when traffic is "beamformed" to a client it cannot use spatial multiplexing on the same antenna as well. If this is the case, with the 2600 only having 3 transmit antennas, does this mean that the max throughput to a client when using clientlink is 300mb ?
If not, how the AP transmit at 450mbps and beamforms at the same time.
I have two WLC5508 controllers running 7.0.230.0, which having the two of them probably is inconsequential because all the APs are added to only one controller. The problem I'm facing is that I have several LAP1552E's deployed throughout my facility, and I have several that are doing Ethernet bridging to some Cisco switches using G0. In this, I have a PC at the end of one of these switches, and using Iperf and PingPlotter to get some metrics, and what I'm seeing is >400ms latency with <3 Mbit throughput to the PC. On the 802.11a radios I have 18 Mbit set as mandatory, with everything below disabled and everything above Supported, with all MCS indexes under 802.11n enabled.
My channel is set to 161 with a 40 MHz channel-width, and a power of 3 configured.After many days of trying different power settings, channel settings, and such, I can't get better results than above and my channel utilization stays > 75% at all times. I do have video cameras attached to the other bridges switches, and have video QoS set to Bronze and the cameras configured to ~ 1 Mbit bandwidth maximum. Also, average RAP-MAP distance is ~ 1100 ft and average MAP-MAP distance is 400 ft, with the longest RAP-MAP being 1400 ft and MAP-MAP distance being 875 ft.
I have 2 - 1410 bridges ( point to point) between two buildings approx 600' apart. They seem to be aligned well ( Signal -52dBm, SNR 41 ) and have been very reliable. However, I cannot seem to run more than 26Mbps thru them.is there any recommended tweaking that can increase my throughput ?
I recently bought a WRT160NL router. I have a 10/10 Mbps internet connection, but when I am connected via the router it only gives me ~2.5/1 Mbps speeds. Connecting my computer directly to the "wall" results in 10/10 Mbps speeds. I have tried connecting to the router both wireless and by wire, it makes no difference. The internal wired and wireless speeds are fine, as I have copied files over the internal switch and via the wireless network at relatively high speeds. I have not fiddled with any connection settings except creating a few permanent DHCP leases.
I have a E4200 V1 with 1G internet connection, when i connect my PC, with a cat6 cable, directly to the modem the download speed can upto 800Mbs, but when i connect through E4200 to the modem it down to 100Mbs.
I have a E2500 connected via LAN to my network via a switch or hub through a sonic wall and into the modem out to the internet. The problem is that I am only getting +/- 5Mpbs Down and +/-7 Mbps up through the router.
If I connect my computer to the network with out going through the router my speeds are more in the range of +/-28 Mbps down and 16Mbps up. I have been working with Linksys support but they have not been able to assist me with this yet! Is there any configuring I should be doing at the firewall or to the router to tell it to open up the port for faster speeds?
I have a client devices constantly sending data (~ 13 kb per second) to a server through a Cisco AP1241AG (802.11g).I use Iperf to test throughput, but I am having a difficult time determining what an acceptable throughput rate would be.I know in "theory" the best throughput rate I could get is 54 Mbps, but since my client devices only send 13 kbps is 1 Mbps more than enough? or is 13 kbps the low limit for my throughput test?
I have a Cisco 5508 setup at a host site with 3 other sites connected using hreap on 1252APs. When doing testing of network speed I find that the throughput from the wireless to wired network is at about 18mbps yet the same test on wired side is 85-100mbps and wireless to wireless is 18mbps
I have an E4200 running firmware v1.0.03.Works fine for a period of time (might be hours, might be days) then throughput drops to something in the range of 1-3M when typically I'll see 6-8M (DSL). I can reset the DSL modem, hubs, etc but the problem isn't fixed until I reset the E4200; so I've pretty much narrowed it down to the router.
I have been running some test to see what I can do for speed to the interenet and NAS drive.I have a NIC card (1394) and the max connection I get is 400 Mbps. The card is suppose to be 10/100/1000 card and E3000 is the same... so why can't I connect at 1000?Max transfer I get to my NAS is 64-80 Mbps. Is there any way I can get this to be faster? I have a 1TB western digital drive attached.If I went with a NAS system like a Synology BYOD system could I get faster speeds for transfers if the NIC on the system was a 10/100/1000?`
I have a 500Mbps Internet Connecton with fibre and I bought an EA3500 recently. I found the LAN through put degraded by compare connected and not connected with EA3500.all connections are using CAT5e cable with all Gigabit port enabled in PC/ISP Router.
I'm using E4200 (fw 1.0.03) as AP and EDIMAX 6675nD as a client. I can't get over ca 10MB/s data througput even there aren't any other communication loads. Test conditions are: 5GHz band, no other networks in the band, distance 2m without any obstacles, no other data transfers (except the test), data source is NTB on GLAN port of Linksys, data sink is NAS at GLAN port of Edimax, test file is 0.5GB file. The NTB and NAS doesn't seems to be a bottleneck, because NTB connected directly to the Edimax does over 50MB/s. Both the E4200 and 6675nD are (should be) capable of 450Mbit/s @ MCS23. Strange thing is that none of them allows setting of MCS23 in their manual settings. It ends with MCS15. While forcing the E4200 to a specific MCS (in the hidden wireless_advanced menu) the MCS15, 14, 13 and auto give very similar results. The throughput drops by MCS 12 and lower indexed MCSs.The 10 MB/s seems to be a low number.... and (based on internet forums) I'm not the only one fighting the magic number 10MB/s. What is the reason of the ca 10MB/s bottleneck? And the resons why both of the routers are quiet about the MCS16 to 23 schemes in their menus, while their labels aren't?
I've just upgraded to FIOS quantum service. (50 MB down, 25 up). I have a Linksys 2500 connected to the FIOS router. The FIOS (ActionTec) router provides the full advertised speeds with any speed test service I try. But with the 2500 connected to the FIOS router I get download speeds about 3MB. The MTU on the linksys is 1500. It's connected correctly and is running it's own DHCP server. (Why am I doing this? I try to avoid the ActionTec routers, they have broken many services in the past.)The 2500 firmware is up to date. I've tested on the wireless and wired (ethernet) interfaces.
We have a 1841 setup with WAN and LAN subinterfaced(2 WAN connections, 1 internal VLANs) and I am recieving some pretty horrible throughput when traversing the router to the WAN.
I am receiving about 2 MBPS down but around 5 up.Currently there is a ACL on the WAN interface, and as well we are running NAT NVI. It is possible that this might have something to do with it, but I am not sure.
Most of the CPU is going to IP input however I cannot seem to determine the cause. One thing I am thinking is the overload for NVI is using a route-map. Could that cause it to process switch instead of fast/CEF switch?
My first wireless router, which I still have and works perfectly, was a DIR-601, A1, fw v1.00na. It has always been reliable and worked great, save for being a little weak on the signal range. Back when I got it I knew little about networking period, let alone wireless routers- so I never tweaked anything on it. Now it's almost 4 years later. Being a little more knowledgable, and my family creating A LOT more traffic on my network, I decided some upgrades were in order. First I called COX to upgrade my speed too, which led me to having to purchase a new Motorolla SB6121 modem- and everything was great. However, aside from the same old dead spots in my house, I was starting to realize the limitations of my 601 with regards to handling the traffic load. Since I never had an issue with my 601, I decided to stay loyal to D-Link. After, albeit, a small amount of research... I decided on the 655. It fit the budget, and I read some decent reviews on it regarding gaming. Plus, from what I've read, I didn't really see any benifit to justify a dual band router for what I do. Anyway, my new 655, B1, fw v2.05NA has solved all of my wireless issues and handles our traffic perfectly, except for one slight problem- my wired PS3. I have Cox ultimate, which here in Nevada is up to 150Mbps, and wired my laptop is getting 107Mbps download- pretty consistently with the 655, and around 100 with the 601. My PS3 on the other hand, went from 27 to 32Mbps wired with my 601, to only getting 8 to 15Mbps wired to the 655- and a lot of lag on certain online games. It seems that out of all of our devices, my PS3 is the only one that doesn't like the 655. I really hesitate to DMZ my PS because of the risks, but at this point I'm almost desperate enough to try anything. I hooked the 601 back up for now for the PS3 performance...but we are REALLY missing the wireless and traffic handling performance of the 655!!
When a physical switchport/routed port has high usage, you can move the link to a higher capacity port, upgrade the port, bond links, etc. What exactly do you do when an SVI has high usage? I guess you could remove some servers from the VLAN, but that doesn't seem like a reasonable solution. What dictates the capacity of an SVI? The backplane of the switch?
We are looking at providing an ISR 819 for one of our customers using FTTC & 3G for failover .. However, I cant seem to find any recommended throughput guidence for the device? We could be looking at up to 80Mbps via the ethernet interface and I just dont know if the device will cope?
I have a Cisco 881 (without wifi model) connected to a 100Mb unmanaged switch and a cable modem with a 120Mb down, 10Mb up connection. When I connect the modem directly to my laptop, I can reach the 120Mb/s down and 10Mb/s upload speed. When I connect the modem to the 881, the max download is about 30Mb/s. Upstream 10Mb is no problem. I've been trying to change the duplex and speed settings on the FastEthernet4 interface, but this has only a worsening effect. I should be able to get about 100Mb/s (since switch is only 100) right?
We have multiple sites that have either fiber 20mb d/u or cable 50/10 d/u. Recently we have upgraded our head end router to a 2921 security based router and noticed that no matter if we are sending or receiving the most we can push is 1.6Mb. I would expect this number to be at least 8Mb for uploading and at least 18mb for downloading from other sites.I have included parts of my config and screen shots of bandwidth usage for troubleshooting. [code]
