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  • Slower than expected 802.11n wireless network speeds

    - by Ian
    I have two ASUS laptops running Windows 7 connected wirelessly via 802.11n at 150 Mbit, as reported by Task Manager. The router is Netgear WNDR3700. When testing the wireless connection speed using iperf, I'm not getting nearly 150 Mbit: C:\>iperf -c 10.0.0.123 -t 30 ------------------------------------------------------------ Client connecting to 10.0.0.123, TCP port 5001 TCP window size: 8.00 KByte (default) ------------------------------------------------------------ [148] local 10.0.0.116 port 53819 connected with 10.0.0.123 port 5001 [ ID] Interval Transfer Bandwidth [148] 0.0-30.0 sec 41.2 MBytes 11.5 Mbits/sec That's a typical result. Running parallel client threads does not increase the overall total speed. Why would I only be getting 11.5 Mbit on a 150 Mbit connection?

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  • Does using a single cable to connect two switches create a bottleneck?

    - by Nick
    I realise this may be a stupid question for some, but it's something I've always wondered about. Let's say we have two gigabit switches and all of the devices on the network are also gigabit. If 10 computers connected to switch A need to transfer large amounts of data to a server on Switch B (at the same time), is the maximum transfer speed of each connection limited by the bandwidth of the connection between the two switches? In other words, would each computer only be able to transfer at a speed of one gigabit divided by the 10 machines trying to use the "bridge" between switches? If so, are there any workarounds so that every device can use it's maximum speed from point to point?

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  • download speed is fast but transfer rate is slow

    - by Ieyasu Sawada
    I've just changed ISP and I'm pretty disappointed with the transfer rate. My previous connection has a download speed of 1.08 Mb/s as seen from this site: http://speedtest.net and the download transfer rate is about 100kb/s for sites that doesn't limit their bandwidth. Now my connection has about 2Mb/s download speed but the transfer rate is dancing from 20-50kb/s . I was expecting a speed much higher than this because of the download speed that I'm getting when I'm testing. The question is what's the difference between transfer rate and download speed, is it normal to have a high download speed but low transfer rate, should the download speed be proportional to the transfer rate?

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  • Multiple WAN interfaces in same subnet on Sonicwall NSA220?

    - by Ttamsen
    (eta salutation, which keeps getting eaten.) Hi, all. I see a bunch of related questions, so I'm hesitant to ask, but: I have a situation where I have a Sonicwall NSA220 serving as firewall/router for two internal subnets to two external WAN connections. In some locations this is two separate ISPs. In others, it's the same ISP but with multiple circuits. The problem is that one ISP has been unable to provide unique subnets for each WAN interface. Is there any possibility that I might be able to bond the two WAN interfaces into a single virtual interface, and then use source-routing to get internal subnets communicating out the appropriate physical interface? Or even just use traffic-shaping to give each internal network appropriate shared bandwidth? I haven't found anything in the docs, but it seemed like it might be worth asking. Thanks for any help! -Steve.

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  • Ask a DNS server what sites it hosts - and how to possibly prevent misuse

    - by Exit
    I've got a server which I host my company website as well as some of my clients. I noticed a domain which I created, but never used, was being attacked by a poke and hope hacker. I imagine that the hacker collected the domain from either hitting my DNS server and requesting what domains are hosted. So, in the interest of prevention and better server management, how would I ask my own DNS server (Linux CentOS 4) what sites are being hosted on it? Also, is there a way to prevent these types of attacks by hiding this information? I would assume that DNS servers would need to keep some information public, but I'm not sure if there is something that most hosts do to help prevent these bandwidth wasting poke and hope attacks. Thanks in advance.

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  • Which way should we choose to shorten backup time?

    - by facebook-100005613813158
    A company performs a full backup for its data in a daily basis for disaster recovery purposes. However, their backup process cannot be completed within the assigned backup time window. What would you recommend to this company about how to restructure its backup environment in order to minimize the backup time? We got 4 candidates, 1. Perform LAN based backup 2. Weekly full backup and daily incremental 3. Weekly full backup and daily cumulative 4. Add more ISL to increase bandwidth when comparing incremental backup with cumulative backup ,incremental backup time is surely shorter than cumulative backup time .But I don's know adding more ISL is allowed in an existing storage system,or can this operation really shorten backup time ?

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  • Does HDMI cable "quality" actually affect transmission?

    - by TheDeeno
    I really don't want to pay a ridiculous price for a "name brand" HDMI cable if it doesn't really do anything for me. I'm just curious: now that most transmission is digital (packetized) is there such a thing as a "quality" cable? I suspect that if the cable works at all, I'm safe saying I have a quality connection. I just want to double check. Some of these reviewers complain that generic cables "create noise, lack bandwidth, can't handle X, etc". I'm skeptical of these reviews. If the logic for HDMI cables and quality can be applied to cables in general, please elaborate on that as well.

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  • Calculating Cloud Service Costs [closed]

    - by capdragon
    Possible Duplicate: Can you help me with my capacity planning? I would like to scale a web application to the Cloud and wanted to know if anyone had any experience calculating costs and could tell me how I would go about that. I have NO experience with cloud services at all. Currently my production environment consists of two web servers and one database server. If the application continues on a linear growth path, eventually, I want to scale to the cloud to avoid any more long term commitments to extra hardware. I want to be able to create a similar environment I have now as a baseline. Have this as my fixed cost that I will always have. I also want to calculate my variable costs that will increase with more users or bandwidth. I don't have a preferred cloud vendor. Amazon, Rackspace, Terremark or any other is fine as long as understand how to calculate my fixed and variable costs.

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  • Monitoring Maximum Process Network Activity

    - by user125973
    We have a collocated server on which we run some OpenVZ hosts. Recently, we have had to pay a lot extra we keep exceeding our bandwidth quota. Our quota is 5 Mb/s but we have spike to almost 50. I looked at the graphs and there are some spikes happening at some intervals. I want to know which process is causing this so I need a tool that monitors the processes and gives me the one with the maximum instant traffic (It doesn't matter how much traffic we have as long as we don't exceed the 5Mb/s quota). Does anyone have a recommendation for this? My hosts are CentOS 5 with OpenVZ so I can see all the containter processes from the host, if that helps in any way.

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  • Re-streaming RTMP stream

    - by Yvan JANSSENS
    I have a set of local RTMP stream servers in my network, but I want them to be reachable outside. The bandwidth is too narrow to serve multiple clients on the streamservers of my network, so the idea is to pull the local RTMP streams on a computer serving as a gateway, which pushes them on his turn to a hosted streaming provider. It is not possible to let the sources of the stream push their stream directly to the server outside due to network policy restrictions. Scheme of what I'm trying to accomplish: Internal network | External network ------------ ------------ ----------------------- | internal | <---- | Gateway | ------> | streamserver outside| | streams | ------------ ----------------------- ------------ | ^ | | | ----------- | | clients | | ----------- My question now is: which application which can pull a live stream from an RTMP source (Flash Media Server) and push it to another one (Flash Media Server at hosting provider).

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  • Are there any negative impact running all services on a single static IP?

    - by Jake
    I need to setup a VPN trunk (with remote branch office location), Video Conference and Web Server on-premise in the office. I am used to ISP providing blocks of 8 or 16 IPs. But I have a new ISP which says they only can provide a single IP. Are there any issues with running all services on a single IP? I don't think this has any thing to do with bandwidth..? I'm not using SSL certificates... I can do port forwarding to different machines... What else...? Disclaimer: I am a programmer by training. Sorry for noob question.

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  • Intermittent connection issues with atheros ar9285

    - by MrStatic
    I have an asus K50IJ which has an atheros ar9285 wifi chip. It has decided to start to randomly drop internet. Although the card doesn't seem to notice it has. It will show full signal instead of say 3 bars. I tried to look at the atheros site for the latest driver but they don't even offer driver downloads. I then checked the asus site and it doesn't even list that card in the downloads for this laptop. I run Windows 7 64bit. It will drop either every minute or once a day while I am doing intensive bandwidth usage and when I am just idling.

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  • Zero-channel RAID for High Performance MySQL Server (IBM ServeRAID 8k) : Any Experience/Recommendati

    - by prs563
    We are getting this IBM rack mount server and it has this IBM ServeRAID8k storage controller with Zero-Channel RAID and 256MB battery backed cache. It can support RAID 10 which we need for our high performance MySQL server which will have 4 x 15000K RPM 300GB SAS HDD. This is mission-critical and we want as much bandwidth and performance. Is this a good card or should we replace with another IBM RAID card? IBM ServeRAID 8k SAS Controller option provides 256 MB of battery backed 533 MHz DDR2 standard power memory in a fixed mounting arrangement. The device attaches directly to IBM planar which can provide full RAID capability. Manufacturer IBM Manufacturer Part # 25R8064 Cost Central Item # 10025907 Product Description IBM ServeRAID 8k SAS - Storage controller (zero-channel RAID) - RAID 0, 1, 5, 6, 10, 1E Device Type Storage controller (zero-channel RAID) - plug-in module Buffer Size 256 MB Supported Devices Disk array (RAID) Max Storage Devices Qty 8 RAID Level RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 1E Manufacturer Warranty 1 year warranty

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  • Social-Networking Startup, Hosting Plan

    - by pws5068
    I've created a social networking community which is soon ready to release, and I'm trying to decide on a type of hosting plan. I have considered options such as VPS and Reseller plans. I anticipate (or hope for at least) a significant amount of traffic/bandwidth in the not-too-distant future. If I open a reseller, will I receive the same amount of server lag during busy hours that I do with a shared account? How significant is the profit margin with the reseller option? Aside from generalized "configurability", what advantages merit purchasing a VPS? Is there anything stopping me from reselling space on a VPS account? Features I need Include: PHP, MySql, Unlimited Domains, Ruby on Rails, Remote Database Connections

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  • Diagnosing high CPU waiting

    - by Will
    I have a monitoring server that is running icinga/collectd/graphite with about 50 hosts. I have noticed high load/slugging performance on the box. If you take a look at top, you'll see: Cpu(s): 0.6%us, 0.2%sy, 0.0%ni, 7.6%id, 23.4%wa, 0.0%hi, 0.2%si, 0.0%st Notice the HUGE %wa value, which as far as I know means a network or disk bottleneck. ifconfig shows no dropping packets and there's not a ton of bandwidth going on, so that leaves disk issues, right? There's not a lot of disk writing going on either...iotop is reporting we're only writing a little over 1 MB per second and the RAID tool reports everything is A-OK and write caching is enabled. How do I go about trying to figure out how to fix this? UPDATE: iostat -x output is: avg-cpu: %user %nice %system %iowait %steal %idle 0.62 0.10 0.31 9.65 0.00 89.31 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.21 33.34 83.55 16.54 1599.94 399.07 19.97 43.21 416.98 3.71 37.13

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  • PCI max throughput

    - by allentown
    Hypothetical here, but I want to understand. Say I have a hand me down machine, 4 PCI slots, 64-bit 33 MHz PCI. How much data can that PCI bus handle? System bus is 133 MHz. I want to use one slot for a SATA II card, and the rest for Gig-E cards, building out as fast a NAS as I can. I think one slot may be AGP2x, so that leaves me 2 for Gig-E and one for SATAT II. Will I saturate, what is the max bandwidth of the PCI bus?

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  • Remote monitoring with screen capture

    - by Anonymous
    Is there anyway i can perodically take screenshots of a remote computer using nagios? I am experimenting with Nagios, and i am trying to explore different monitoring. So my question is apart from using nagios to monitor cpu usage, bandwidth utilization, uptime etc.. can i monitor my worker's productivity by checking what is he doing on his computer in a form of image output. Being able to monitor processes would not be of much help to me, as i only know if he or she is running firefox.exe for example he maybe using excessive use of firefox for facebook or other stuff but he claims he is troubleshooting and looking for solutions on forums. I saw a check_vnc script but i am unable to install the requsite vnc server anyone succesfully tried the vnc script care to share how to go about it? If not anyother way to try this?

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  • If fiber runs 1gig fine, are there any concerns when considering upgrading to 10gig transceivers?

    - by Eric
    We had fiber installed (connecting ~10 buildings) around 5 years ago and it has been working great. The initial setup involved Procurve 2848 and 2824 switches w/ 1gig transceivers. However, lately we have been considering upgrading our network both to increase bandwidth and possibly add VOIP. However, a lot of this is assuming that we can just use pop the existing fiber into 10gig XFP transceivers in better switches and call it a day. If the fiber works fine at 1G does that mean it should be fine for 10gig? If not, how can we confirm that our existing fiber trunks will work, preferably in an affordable fashion?

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  • Using 2-port LSI 2308-8e card to control 24 SAS HDDs

    - by GregC
    I would like to rely on a RAID-on-chip solution to control 24 SAS hard drives in a direct-attached environment. How would you approach this to get best bandwidth given that I'd like to spend less than $10,000 on the interconnect. I've read that LSI 2308 chip can easily handle 8-drive SSD RAID6 in hardware. I'd like to harness its power to control 24 SAS hard drives over an expander in an external enclosure. Currently I use an Infortrend S24S-G2240 external enclosure. It provides its own controller and expander. I'd like to use LSI 2308 controller for RAID6 somehow instead of the mystery controller in the enclosure. P.S. I tried to create SAS-expander as a tag, but my rep on this site is low.

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  • Recommendation for e-mail forwarding

    - by Paul Mrozowski
    We currently have a provider that we use to primarily forward our e-mails to both a hosted Exchange site and to outside e-mail addresses. We have a large # of forwards set-up (maybe 500). They work fine for us but the bandwidth costs are a getting pretty expensive (approx 80GB in email a month) so we're looking for a less expensive alternative (it costs us nearly $150/mo). I've looked at just hosting this here via a PostFix server and one of the nice front-ends available for it. However, I'm not thrilled with the prospect of being responsible for maintaining yet another server, backups, network connectivity, etc. So I'm leaning towards having this hosted by someone else if possible. Does anyone have any recommendations for hosting providers? Are there some I should stay away from?

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  • Instant messanger capable of offline messaging & tolerant of network interruptions

    - by Terry
    I am looking for an instant messaging solution to facilitate communications between recovery vehicles in remote rural areas. All the vehicles have internet connections, but they are intermittent depending on location. Ideally we'd like something that has the following features: Offline messaging: messages sent to clients who are offline will be delivered when they next come online, regardless of whether the sender is still online or not. Lightweight: CPU cycles are limited on the machines in these vehicles. A bloated solution will be an issue. Client platform is primarily win32, but support for osx/linux/mobile devices would be a bonus. Non-chatty: Bandwidth is a precious commodity for us, so services which use a minimal amount are ideal. Fault tolerant: We see plenty of packetloss and high latency, so whatever we use needs to be able to function in trying network conditions. I'm not fussed if we use a hosted platform like gtalk/skype/msn/icq/whatever, and likewise I can run a server if need be. Suggestions would be appreciated!

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  • iptables rules for botnet (UDP flood) protection

    - by Petar Simeonov
    I'm currently experiencing a massive UDP attack on my server. I host a couple of gameservers, mainly Tf2, CS:GO, CS 1.6 and CS:Source, and my 1.6 server is being flooded. I tried different rules in iptables, but none of them seemed to work. I'm on a 100mbps bandwidth tariff, but the flood i receive is 500+mbps. This is the log of the latest tcpdump - http://pastebin.com/HSgFVeBs Packet length varies throughout the day. Only my gameserver ports are being flooded - 27015, 27016, 27018 via UDP packets. Are there any iptables rules, that might prevent this?

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  • Is there a way to bridge two outgoing TCP connections in order to bypass firewalls and NAT?

    - by TK Kocheran
    We're all familiar with the problem of port-forwarding and NAT: if you want to expose something to accepting an incoming connection, you need to configure port-forwarding on the router or conjure up some other black magickery to "punch holes" in the firewall using UDP or something. I'm fairly new to the whole "hole-punching" concept so could someone explain how it works? Essentially, I'd like to understand how hole-punching would work and the theory behind it, as well as if two TCP connections could be bridged via a third party. Since there's no issue with outgoing TCP connections since it's handled with NAT, could a third party bridge the connections so that the two parties are still connected but without the bandwidth cost of traffic going through the third party?

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  • MRTG + RRDTool Hourly Graph

    - by SuperMicro321
    I am using MRTG + RRDtool to monitor the bandwidth on each switchport of a Cisco Catalyst 2950 via snmp. Is MRTG capable of generating an hourly graph? With RRDtool I was able to set the interval to 1 minute in hopes of getting a more detailed graph, but the shortest timeframe the graph is 'Daily' graph (5 Minute Average) and the image is too small. What I am looking to get out of this: I am looking to be able to visually monitor all of the switch ports and tell when port begins to have unusually high traffic, in real time (1 minute interval of snmp poll, graphs generated, and page refreshed).

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  • background copy large files to a laptop?

    - by Roy Pardee
    Hey All, I like to watch windows media center recorded TV files on my laptop in bed. I find thought that when the programs are in HD I have a lot of stuttering and delays--no doubt b/c of the amount of data being transferred. I actually have a fair amount of space on the laptop's hdd, and wouldn't mind moving the files onto that hard drive, where no doubt my problem would go away. But that requires some planning & time for the files to move. Is there a utility out there that would kind of 'trickle' the files over to the laptop over a long period of time, w/out soaking its bandwidth? Something like ms' BITS tech? Both machines are running win7. Many thanks! -Roy

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