Browsing articles tagged with "bandwidth - Admins Goodies"
Dec 26, 2012
tom

Bandwidth limits for Amazon EC2

I have a micro instance on Amazon EC2 cloud. Also the instance is small and it has vary low CPU and EAM usage but it generates a lot of content, so it can be considered like a web server serving small amount of static files (not of a big size) to many clients. From the technical point of view there is no problems for such instance to handle the load serving many MBs per seconds. […]

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Nov 17, 2012
tom

Is ceph usable with only 100Mbps bandwidth between nodes?

I haven’t great hardware, but my requirements are low, I would like to start using ceph so as to abstract filesystem location and allow potential easy scaling to bigger hardware in an hypothetical future. My actual hardware meets ceph hardware requirements except the ethernet bandwidth part between the hosts. Mine is 100 Mbit/s which is much lower than the 1Gbps expected in ceph, even from the minimal requirement. Will I be able to use ceph […]

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Oct 6, 2012
tom

Tool to analyze the real time traffic in Windows XP SP2

My client machine/(s) is/(are) Windows XP SP2. I can’t effort every time to have physical access to my server machine. To analyze the real time traffic and bandwidth between client and server machine, which tool would be best? Asked by Ravi Joshi XP’s built-in performance monitor (Control Panel/Administrative Tools/Performance; Start, Run “perfmon”) will be your friend here, once you’ve done some configuring on it. To wit: Remove all of the default counters by clicking them […]

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Sep 6, 2012
tom

Bandwidth monitoring with iptables for non-router machine

I came across this tutorial here that describes how to monitor bandwidth using iptables. I wanted to adapt it for a non-router machine, so I want to know how much data is going in/coming out and not passing through. Here are the rules I added: iptables -N ETH0_IN iptables -N ETH0_OUT iptables -I INPUT -i eth0 -j ETH0_IN iptables -I OUTPUT -o eth0 -j ETH0_OUT And here is a sample of the output: user@host:/tmp$ sudo […]

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Jun 27, 2012
tom

What is the best way to transfer a single large file over a high-speed, high-latency WAN link?

This looks related to this one, but it’s somewhat different. There is this WAN link between two company sites, and we need to transfer a single very large file (Oracle dump, ~160 GB). We’ve got full 100 Mbps bandwidth (tested), but looks like a single TCP connection just can’t max it out due to how TCP works (ACKs, etc.). We tested the link with iperf, and results change dramatically when increasing the TCP Window Size: […]

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Jun 20, 2012
tom

afp/smb transfers caps at 2 megabytes/sec, wireless N

I wanted to transfer files between two mac computers. The network is wireless-N and both computers have wireless-N modules in them. The problem is that when I transfer files between them, via file sharing (afp) the network speed caps at 2 megabytes/sec. Just downloading files from the internet I can get faster speeds, so this isn’t a constriction of my wifi bandwidth, it appears to be a constriction of the protocol being used. My wifi-n […]

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May 17, 2012
tom

Local network speed appears to be being limited

I have a dedicated server setup that has just started causing us issues. Our immediate problem, is that last week, could log into an admin page of one of our websites just fine, now we can’t. It does do a heavy SQL procedure on the SQL database, but as its only a small usage site, im ok with that. The problem the website is timing out, and the admin’s can not log in. It seems […]

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Apr 30, 2012
tom

Limit scp (with sshd on centos) speed / rate

I’d like to let users download / upload files via scp to my centos 6.0 system, it’s connected to lan via Gigabit ethernet, but I don’t want transfers to flow at that speed. I want to limit the speed to 10Mb/s. I have managed to find the right configuration for vsftpd to limit the rate, but failing to find the same for sshd. Any help would be very much appreciated. Edit : Just to make […]

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Apr 27, 2012
tom

Does google’s web crawler download binary files?

My Google-fu is failing me right now. I’m trying to figure out whether Google’s web crawler downloads non-image binary files when it spiders sites. I know it downloads (and indexes) images and PDFs, but what about .zip, .dmg, etc? My client offers a lot of sofware packages for download on their site, and they’re trying to figure out whether search engines are making up much of the bandwidth involving these files. Asked by jessica The […]

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Apr 22, 2012
tom

linode server bandwidth

I am ready to deploy my startup on the web so i would like to start small and get a VPS from linode as i see many good reviews and see how its going… the thing is that on their website they state: Transfer 200GB for their Linode 512 does this include incoming and outgoing traffic? what if i get some unexpected traffic due to ddos, i dont know what else and all my traffic […]

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