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• hung up troubleshooting packet discards

  - by Chris Satola

  I realize my question is generic, but hopefully someone may have some guidance for me. My network consists of Cisco switches. I am seeing a significant amount (upwards of millions of packets per day) transmit drops between two switches. One being a 3750 and the other a 3560. The peak throughput of this link is only upper 400Mbps, so it shouldn't be a bandwidth issue. At this point, I am sort of clueless where to look or what tools I can use to determine what packets are dropping and why. I can setup a SPAN port on that link and wireshark it, but I don't know if that could tell me anything. Does anyone have any suggestions? Thanks in advance.

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• IIS7 response size thresholds

  - by DanielM

  I have a customer who is attempting video playback via HTTP progressive download of very large files ( 1 GB). There is no problem once a file is cached at the edge via my CDN, but hits to my origin (first hits prior to edge-cache population) experience stalling and loss of sync between audio and video about an hour and a half into playback. This occurs pretty reliably at that point, suggesting that some threshold somehwere is getting hit. Are there IIS configuration knobs governing HTTP Response size? Other data points: I am unable to replicate this problem. I am looking at client bandwidth and last mile issues. I am looking at possible encoding recipe dependencies. But this problem never came up when we were using a "push" cache configuration (CDN-hosted origin), so something funky serverside at my origin seems like a likely culprit. Thanks ...

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• HP-UX -> Linux incremental remote backup

  - by stack_zen

  Hi. I've the need to setup a differential backup process from a range of remote HP-UXes to a central RHEL5 server. I'd happily go with rsync, problem is, stock HP-UX 11.11 has no built-in rsync and I don't have permissions to install any software on the remote stock HP-UXes. How should I approach this? HP-UX provides: fbackup (HP-UX exclusive) cpio (available in RHEL5, allows backing up only the files which changed, but always grabs the totality of the file) ssh remote_user@remote_host 'find /u01/engine/logs/ -type f -name "*.log" | cpio -o | gzip -' | cpio gunzip - | -idmv Those solutions don't really answer my incremental (bandwidth efficiency) problem do they?

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• How can I unlock a file without closing the file handle?

  - by netvope

  When I'm downloading a video file with Google Chrome, the file is locked and cannot be opened by media players. I want to be able to play the file while it's being downloaded. The video bitrate is lower than my Internet bandwidth so it wouldn't be a problem. Popular unlockers work by closing file handles, which would interrupt the download. How can I remove the read-lock without closing the file handle? Can I replace the read-lock with a write-lock?

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• Dialing into multiple PPP connections on Ubuntu

  - by sharjeel

  I have multiple 3G USB based Modems. I would like them to keep connected simultaneously, NOT necessarily aggregating their bandwidth; a separate intelligent application would manage their utilization effectively. However I am running into problem of setting up proper routes for the ppp0,ppp1 interfaces: when one of them connects, other's entries in the routing table get updated so it is no more usable. If I reconnect the second one, it would override the first one's routing entries. If I do it over and over, sometimes both of them's entries disappear while in rare cases the two work well. I have tried it both using NetworkManager as well as WVDial but issue pops up in both of these. Perhaps both of them use same PPP dialer at the backend and thats why this issue appears. What is the proper solution to make them work together? In the long run, I'd also like them to automatically dial in once USB gets connected.

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• Network monitoring solution

  - by Hellfrost

  Hello Serverfault ! I have a big distributed system I need to monitor. Background: My system is comprised of two servers, concentrating and controlling the system. Each server is connected to a set of devices (some custom kind of RF controllers, doesnt matter to my question), each device connects to a network switch, and eventually all devices talk to the servers, the protocol between the servers and the devices is UDP, usually the packets are very small, but there are really a LOT of packets. the network is also somewhat complex, and is deployed on a large area physically. i'll have 150-300 of these devices, each generating up to 100+ packets per second, and several network switches, perhaps on 2 different subnets. Question I'm looking for some solution that will allow me to monitor all this mess, how many packets are sent, where, how do they move through the network, bandwidth utilization, throughput, stuff like that. what would you recommend to achieve this? BTW Playing nice with windows is a requirement.

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• automating sql express backup via VSS backup

  - by Ornus

  I need to set up on my server automated daily SQL db backups (sql express, so no maintenance plans). To keep things simple I'm gonna use a backup solution (JungleDisk) that uses VSS to back up the DB file. SQL fully supports VSS and on requests freezes DB I/O, so I understand I'm taking snapshots. JungleDisk supports doing differential back up and compression, so it simplifies things and keeps the cost/bandwidth down. Is it enough to just backup up db file (mdf). Do I need to back up transaction log (ldf) file as well? I'm ok with losing a day's worth of work (since the last backup). if I go this route, what's the best way to restore the database? are there any issues with this approach I'm not aware of?

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• squid transparent proxy on all ports

  - by Yves Richard

  I have setup squid as a transparent proxy by redirecting port 80 to the native squid port 3128. I know there are issues with getting secure ports like ssl and imaps to go though the proxy but can I redirect all other ports through the proxy as well. I am trying to get a better idea of bandwidth usage. I have setup iptables to log usage and i am getting most traffic going into the related/established rule. I am trying to determine the origins of this traffic by sending traffic to squid for more detailed logging.

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• Thunderbird-3 keeps on downloading already downloaded messages again?

  - by Vivek Sharma

  I am using Thunderbird for my gmail account, with IMAP settings. All my folders are synchronized. A very strange behavior, after all my mails are downloaded, TB3 starts downloading email again. At times saying "downloading x out of y messages" where x y (like now downloading 19 out of 11 messages). Had the same problem in TB3 for windows so, replaced TB with Outlook-07, issue resolved. But on linux, I dont like the evolution's interface, so i have no choice but to stick to TB. Any suggestions how to TB not eat my bandwidth.

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• What can cause peaks in pagetables in /proc/meminfo ?

  - by Fuzzy76

  I have a gameserver running Debian Lenny on a VPS host. Even when experiencing a fairly low load, the players start experiencing major lag (ping times rise from 50 ms to 150-500 ms) in bursts of 3 - 10 seconds. I have installed Munin server monitoring, but when looking at the graphs it looks like the server has plenty of CPU, RAM and bandwidth available. The only weird thing I noticed is some peaks in the memory graph attributed to "page_tables" which maps to PageTables in /proc/meminfo but I can't find any good information on what this might mean. Any ideas what might be causing this? If you need any more graps, just let me know. The interrupts/second count is at roughly 400-600 during this period (nearly all from eth0). The drop in committed was caused by me trying to lower the allocated memory for the server from 512MB to 256MB, but that didn't seem to help.

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• Load balancing with Cisco router

  - by you8301083

  I have a Cisco router with two bonded T1's which are setup as a VPN to the main office. We need more bandwidth but can't get other connections (or it's too costly), so I would like to have a dsl connection installed. This DSL connection will run over a VPN to the same main office, but it won't be bonded with the T1's - so it won't act as a single connection. Since the three circuits won't act as a single connection (basically would be two connections 2 T1's + 1 DSL) we would have to split the network in half - but I don't want to do that. Instead, would it be possible to send all HTTP/HTTPS over the DSL connection but send all mission critical data (such as voice/active directory) over the T1's? I basically want to send specific ports over DSL and everything else over the T1's without separating half of the users traffic over the DSL and the rest over the T1's.

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• Looking for a good Web Server that is cheap

  - by SoLoGHoST

  I am a Project Manager, and former Lead Developer for a software portal system that requires a forum software to run. I am in need of a server that is cheap, reliable, and supports the latest PHP (5.2+), MySQL, unlimited e-mails (preferably), a cPanel, multiple sub-domains (atleast 3+). Currently I am paying $34.95 USD/month (approx. $420 USD/year). This is too high for me to pay to keep the site running. I just recently became Project Manager and in charge of Finances and I'm extremely concerned for the future of Dream Portal. With those prices I'm not sure I'll be able to keep it running for too long. Can someone please tell me of a good server that meets all of the requirements that I listed above that is cheaper on a yearly basis? Note: Currently on a Dedicated Server with limited disk space at 15000 MB (15 GB), monthly bandwidth = 500000 MB, 50 emails limit, 20 sub-domains limit, 30 FTP accts., and 25 SQL Databases.

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• Advice for migrating email server

  - by Chris Adams

  Hi there, I'm planning to migrate a Zimbra server with about 200gb of data from a server hosted in an office into a datacentre, to increase uptime (we've had a couple of outages when our network here started flaking out, and we have people in other countries relying on this server too). However, I'm not sure how best to migrate the data into the data centre without rendering the connection unusable during office hours, because there's far too much to send in over night over the two meg upstream connection we have here. I'm familiar with using tools like nice to stop a long running process degrading machine performance - is there a simple way to throttle a connection between office hours, so the long running transfer doesn't block the pipe, but then opens up outside of office hours to make the most of the bandwidth? I'm aware the alternative here is to simply mail a hard drive to the data centre, but I'd like to avoid doing that if I could. We're using Centos Linux for our servers, in the office and the datacentre, so extra points for an open source linux answer.

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• Looking for something like Google's Picasa [closed]

  - by Skizz

  I almost like Picasa, but there are two issues that irk me and I wondered if anyone knew of an application that does what Picasa does but without the following problems: Network drives. Picasa is hopeless with network drives. Ideally, I'd like photos to be stored remotely and thumbnail databases to be stored locally with a client-server set-up to update client databases. The main aim is to get updates propagated to clients efficently, reduce network bandwidth and have quick browsing on the client. It needs to be snappy when used over a wireless network. This is just a minor point but the folder view looks awful, especially when it uses those tiny thumbnails. (Also, what is it with folders being drawn vertically. Having spent years looking at folders orientated horizontally, turning them on their side looks so wrong.)

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• IPtables rate-limit, What are the differences between modules? Recent, Limit

  - by TechZilla

  I am doing some rate-limiting with IPtables, and i'm not sure if I should use "Recent" or "Limit" What are the differences between the two? If they both achieve the same result, which one has better performance? I would like to know, regardless if any difference would be perceivable. I am looking to ACCEPT if under limit, and REJECT if over. I'm not interested in thus bandwidth throttling, I don't want a queue. I don't need any syntax examples, both have ample use examples online. I have also used Limit in the past. I appreciate any responses.

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• NGINX 301 and 302 serving small nginx document body. Any way to remove this behaviour?

  - by anonymous-one

  We have noticed that when using nginx internal 301 and 302 handling, nginx will serve a small document body with the appropriate Location: ... header. Something along the lines of (in html): 301 redirect - nginx. As appropriate in the above behaviour, a content-type text/html and content-length header is also sent. We do a lot of 302 and some 301 redirects, the above behaviour is wasted bandwidth in our opinion. Any way to disable this behaviour? One idea that crossed our mind was to set error_page 301 302 to an empty text file. We have not tested this yet, but I am assuming even with the above, the content-type and content-length (0) headers will be sent. So, is there a clean way to send a "body-less" 301/302 redirect with nginx?

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• OSS Router firmwares

  - by Cherian

  DD-WRT, Open WRT , Tomato or Third-party firmware projects ? What are the compelling reasons to choose between these? I used to be a great DD-WRT fan until I realized that the author was deceiving users by publishing it as a OSS, but made it very cumbersome to download the source and change it (requires you to download GB’s of source files) .Also their bandwidth monitoring feature was part of the paid version, which IMHO is a killer. Having said that, DD-WRT just worked. And I think that’s great..

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• Apple Software Update Server for Windows

  - by Matthew Iselin

  We have just added a few iMacs to our system and we've found that they all want to download about 1.6 GB of updates... not so great when we only have limited monthly bandwidth! All of our Windows machines just use WSUS, which works great in our environment. It'd be nice if we could do the same for the iMacs without purchasing an additional Mac for a server role. So is it possible to run Apple's Software Update Server on a Windows server? Or do we need to look at purchasing a Mac in order to distribute updates across our clients? Alternatively, could we set up one of the iMacs to run the update server for the other iMacs whilst it is being used as a standard machine (ie, not installing OSX server, and keeping it available for staff to use)?

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• How can I make a specific image stop loading in Firefox?

  - by Gibby

  I don't want to prevent all images from loading or stop loading everything, I just want to stop loading an individual image after I've seen that it's probably not something I care about so I can use that bandwidth for something else. My internet is very slow, but I still like browsing sites like tumblr, imgur, etc. that have lots of images. It seems like GIFs are getting more and more common and they can be several megabytes each... my internet just can't handle it. When I right-click a broken/unloaded image in Firefox, there's an option to reload the image. I essentially want the counterpart to that: to right-click a still-loading image and stop the download. Is this possible? Greasemonkey script, extension, I'll take any method.

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• Is an Adnroid-based Phone a Suitable MP3 Player for Music Streamed over the Internet?

  - by James McFarland

  I am considering getting an HTC phone running Android from Verizon Wireless when I next upgrade my phone. I also have an online account with a music vendor, where I have rights to listen to my collection, but not download the MP3s. Further, I have an unlimited data plan and Wi-Fi, so I have full access to bandwidth volume without any concerns. I am especially interested in mounting my phone in a car kit, and streaming my online music to my car's sound system while driving. If you are experienced in this scenario, or have tried this scenario - Is is reasonable to expect my HTC Android phone to provide me with streaming music via my cell data plan anywhere I get cell service?

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• How do I associate server traffic to a domain hosted on that server?

  - by morley

  I have three or four Linux servers, each of which hosts anywhere from 5 to 50 domains. Each domain has its own folder: /www/projectname/web/ Logs go in: /www/projectname/log However, if there's a traffic spike (or, as I see it on my end, a memory usage spike), I'm not sure how to figure out which domain is responsible for the traffic without running tail -f on each of the projects and making an educated guess based on how fast things scroll. There's got to be a better way! There probably is, but I haven't seen it. And the last time I checked, bandwidth monitors only report system-wide load. So if anyone knows how to do this the right way, please let me know. Thanks!

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• How do i mitigate DDOS attacks on static servers?

  - by acidzombie24

  Here is a slightly different take on DDOS attacks. Rather than a server with dynamic content being attack i was curious how to deal with attacks on servers with STATIC CONTENT. This means cpu tends to not be an issue. Its either bandwidth or connection problems. How would i mitigate a DDOS attack knowing nothing about the attacker (for example country, ip address or anything else). I was wondering is shorting the timeout and increasing amount of connections is an acceptable solution? Or maybe that is completely useless? Also i would limit the amount of connections per IP address. Would the above help or be pointless? Keeping in mind everything is static checking for multiple request of the same page (html, css, js, etc) could be a sign of a attack. What are some measures i can take on a static content server?

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• Datacenter Backup Strategy

  - by EasyEcho

  What are common approaches to backup solutions in remote data centers? I am already familiar with general backup principals and have a very good backup strategy for our local data center but am having great difficulty extending it to a remote data center. We currently do a full backup on Friday, differential Mon - Thu, rotate offsite Friday morning ...rinse and repeat week after week. BTW, we use disks and have been very happy with this approach. We could buy a large storage server and backup everything to it, but this solution doesn't give you offsite. We could encrypt and upload to Amazon or some other online storage but that would take a large amount of time given the data and would be rather expensive paying for the bandwidth leaving the data center and receiving at amazon. We could drive to the data center every Friday and continue to rotate disks as we do now. But that just seems old fashion. What am I missing, are there better options?

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• Which programs using my internet connection ? [closed]

  - by Eray Alakese

  Possible Duplicate: Monitor all and any internet traffic from my home PC - what should I use? My internet connection has 4GB quota. But my quota is run out very fast. I setup Net Limiter , for look which programs using my internet connection. But there isn't any weird program. There is only firefox.exe . So, how can i look all programs which using my connection and leech my bandwidth quota? For example, is there any CMD command ? like netstat

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• USB 3 adapter for a dell 2850 with PCI (or PCIX) ports

  - by Don Dickinson

  Does anyone know if there is a plain PCI (or PCIX) USB 3 adapter. i understand the bandwidth of PCI < USB3, but it still beats the heck out of USB 2. i have some older dell 2850s that do not have the PCI E ports that most USB 3 adapters require. i'd really like to get usb3 in those servers. i searched the internet but didn't see any. the local computer store said they only had pcie adapters. tia, don

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