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  • NIC bonding with two uplinks

    - by Karolis T.
    Is bonding the preferred way of implementing ISP redundancy? In the texts I've seen, bond device has a netmask, gateway of it's own. How can this be obtained if there are two different gateways from two uplinks, which one to choose? Do I need any special routing rules to go with it or does simply configuring separate interfaces (using Debian, /etc/network/interfaces), i.e eth1, eth2 for their corresponding uplinks and bonding them to bond0 handle routing automatically? If I want to NAT client machines, do they use bond device's IP as a gateway? Does the bond0 device is the device that goes into iptables nat rules? Thanks

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  • Server hard disk read speed and client download speed, is there a connection? [closed]

    - by Mywiki Witwiki
    Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post: Does upload speed depend upon download speed of the server? In other words, the data transfer rate between the two computers is only as fast as the speed of the "bottleneck". Let's pretend the two computers are in two different networks and both have 100Mbps internet connection. Ben wants a copy of a file in Mark's computer hard disk with 30Mbps read speed. Does this mean that Ben can download the file at a speed of around 30Mbps only, despite having an internet connection faster than 30Mbps?

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  • Apache: Limit the Number of Requests/Traffic per IP?

    - by Ian Kern
    I would like to only allow one IP to use up to, say 1GB, of traffic per day, and if that limit is exceeded, all requests from that IP are then dropped until the next day. However, a more simple solution where the connection is dropped after a certain amount of requests would suffice. Is there already some sort of module that can do this? Or perhaps I can achieve this through something like iptables? Thanks

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  • Insufficient channel capacity of 1GBit

    - by Roman S
    There is a Caching Server (Varnish): it receives data from Amazon S3 on request, saves it for some time and gives it to the client. We have encountered the problem of insufficient channel capacity of 1GBit. Peak load within 4 hours completely chokes the channel. Server performance is sufficient for now. Approximately 4.5TB of data are transmitted per day. More than 100TB are accumulated per month. The first thought that comes to mind is simply to add one more 1GBit port and sleep peacefully until 2GBit are not enough (it may happen quite quickly) or one server is not able to handle it. And then we just need to add new Caching Servers. But now we need a Load Balancer, which will send requests on one and the same URL, always on one and the same server (to avoid multiple copies of the same cached objects). Here are the questions: Does a Balancer need a band equal to sum of all bands of Caching Servers? What shall we do in case there are no ports in a Balancer? Should we add more Balancers or solve the problem by means of Round robin DNS? What are the standard approaches to such problems? Can anyone advise hosting-companies, which can solve this problem? We are interested in American and European markets.

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  • Measuring cumulative network statistics per user or per process

    - by zsimpson
    I've been googling for hours -- Under Linux I want to know the cumulative bytes sent and received by user or by process over all ip protocols. The best I've found in my searches is that it's possible to use iptables to mark packets for a user, for example: iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner test -j MARK --set-mark 1 It appears that "tc" can then shape traffic with that but I just want the statistic -- I don't want to shape the traffic. I want something like: "user U has transmitted used XMB since time Y". I can't figure out how to get statistics from these marked packets. Also, I've looked at nethogs but they seem to be measuring the instantaneous flow and I need cumulative counts. Anyone have ideas?

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  • Small TCP Window on WAN between 2 Locations

    - by Brent
    Site A: Denver datacenter. 60MBPS. Site B: Chicago. 100MBPS. ICMP pings: Packets: Sent = 176, Received = 176, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 74ms, Maximum = 94ms, Average = 75ms File transfer between sites that never goes past ~7MBPS: Windows Update download at 60MBPS+: Site to site: IPSec VPN using two Cisco 5520's. CPU at 3-4% and lots of memory to spare. The latency between to two sites is very acceptable so I can't see an issue why it is performing so slow when transferring between the two sites. I have found that any type of transfer (FTP, HTTP, Windows file shares) will never go above ~7MBPS. When the WAN was first setup, I was able to get transfers at 50-60MBPS, which is what is expected due to the WAN connection at the Site A at 60MBPS. Then a few days later, I was not able to get anything going faster than ~7MBPS. Is there a upstream router between Denver and Chicago causing this? I want to take the blame away from our setup as downloads from Windows Update go blazing fast and for the first few days after the site to site VPN came up, I was transferring VM images at 50-60MBPS. Our stack: HP P2000 MSA - HP C7000 Chassis - HP Flex-10 - Cisco Gigabit switch - Cisco ASA - WAN

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  • NTOP gives warnings on startup

    - by FR6
    I just installed ntop 1.4.4 and when I start it, it give me infinite warnings "packet truncated": ... RRD_DEBUG: umask 0066 RRD_DEBUG: DirPerms 0700 THREADMGMT: RRD: Started thread (t2992630672) for data collection THREADMGMT[t2992630672]: RRD: Data collection thread starting [p30923] INIT: Created pid file (/var/run/ntop.pid) THREADMGMT[t3086329552]: ntop RUNSTATE: INITNONROOT(3) Now running as requested user 'nobody' (99:99) Note: Reporting device initally set to 0 [eth0] (merged) THREADMGMT[t3086329552]: ntop RUNSTATE: RUN(4) THREADMGMT[t2982140816]: NPS(1): Started thread for network packet sniffing [eth0] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread starting [p30923] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread running [p30923] THREADMGMT[t3047009168]: SIH: Idle host scan thread running [p30923] THREADMGMT[t3057499024]: SFP: Fingerprint scan thread running [p30923] **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (10274->8232) **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (8814->8232) ... Do I need to configure something? I tried to access the web interface (http://localhost:3000) but it does not work. Note: I'm on CentOS. EDIT: Not sure if it helps but there is my "ifconfig": eth0 Link encap:Ethernet HWaddr 00:16:76:BC:7E:77 inet addr:192.168.0.221 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::216:76ff:febc:7e77/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15496640 errors:0 dropped:0 overruns:0 frame:0 TX packets:19256813 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:836230629 (797.4 MiB) TX bytes:608496148 (580.3 MiB) Memory:dffe0000-e0000000

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  • Why can't get more speed on iperf on windows xp

    - by SledgehammerPL
    I test my bandwith and throughput using iperf (jperf) on desktop PC with WinXP. I can't get more than 3Mbit/s outside until I change TCP Window size - about 84Kb is ok. but I can't force XP to use this value by default.. I try very many magic spells on Registry, use many TCP Optimisers - but nothing works. I will accept that that everything is ok, when I reboot the PC, run iperf and will see 18.1Mbit - like my Linux box standing very near my Windows XP Box. Is it possible?

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  • calling a method on the parent page from a user control

    - by Kyle
    I am using a user control that I created (just a .cs file not an .ascx file), that does some magic and depending on a value generated by the control, I need it to do something on the parent page that is 'hosting' the control. It needs to call a method under certain circumstances (method is on the parent control). the control is placed on the parent page like so: <customtag:MyControl ID="something" runat="server" /> I'm dynamically creating buttons etc on the control itself but when a button is clicked, let's say for example that there's a text box on the control and if the value of the textbox is "bob" it needs to call a method on the page that's housing the control...how can I accomplish this?

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  • iptables: limiting bytes downloaded per IP per day?

    - by Miles
    On a public-facing web server, I'd like to limit the total bytes downloaded per IP address per day. For example, after a visitor downloaded 100MB, any additional requests would be dropped or rejected for the next 24 hours. Is it possible to accomplish this using iptables alone? The connbytes, connlimit, hashlimit, quota, and recent options all look promising, but the man page plays its cards close to the vest (e.g., "quota - Implements network quotas by decrementing a byte counter with each packet. --quota bytes The quota in bytes."). Would like to avoid using a proxy (like Squid) if possible.

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  • Is SATA bandwith per Port or per Controller?

    - by instanceofTom
    I always assumed that it was per Controller channel, and that If I have 4xSATA 3.0Gb/s ports on my Motherboard then I should have a potential 12.0Gb/s of bandwith. However, after doing some searching I found conflicting information suggesting that if I had 4xSATA drives connected to my MB and were using them simultaneously each drive would get only 3.0Gb/s /4 = 768 Mb/s max bandwith. So I wanted to clear up my understanding. Side question: Are there other hdd/ssd bandwith bottlenecks to be aware of? (Links to already answered questions are more than welcome)

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  • Throttling apache downloads selectively

    - by Synchro
    I have a linux box running Debian Sarge (old I know) and apache 2.0.54. It serves two kinds of files - regular web pages and small images, and a lot of large podcast mp3s. The podcast downloads swamp the connection and make the rest of the site unresponsive, so I'm looking to throttle the data transfer rate (not the request rate) of just the podcasts. I've set up haproxy using this technique which does what it says it will, but solves a different problem - even only 5 simultaneous podcast downloads is enough to saturate the link. In a perfect world, haproxy would support per-connection throttling, but it doesn't. So far I've looked at mod_bw (won't compile for me, seems unsupported), mod_cband (unsupported, widely reported as problematic) and iptables using tc. The iptables approach would allow me to throttle things, but would not be at all selective, slowing down everything on the server, not just the podcasts, so would just move the bottleneck without changing overall behaviour. Ideas?

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  • Remote file copy util (like rsync) but that will take account of data already copied (in this sessio

    - by Rory McCann
    Let's say I have a directory with 2 files, both are identical and quite large (e.g. 2GB ea.) I want to rsync that directory to a remote host. As I understand it (and I could be wrong), rsync calculates checksums of files. Surely if it sees 2 files with the same checksum it can just copy the first file, then do a local copy on the remote host for the 2nd file? That would make it faster, no? On a similar note, doesn't rsync hash all the remote files before copying? If it saw a different file with the same hash as a file that was to transfered, it could do a local copy on the remote host. Does rsync support this sort of thing? Is there some way to turn it on? Is there a tool similar to rsync that will do this sort of 'hash based' local copies?

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  • How do I split an internet connection into 4 equal connections?

    - by luis velasco
    My 4 roomates and I have a problem: One of my roomies is downloading torrents all the time. When somebody need make a call or doing something like you tube or a quiz using the internet conection. The internet is very slow.... I can not create a network using a computer as a proxy. I just need a good router (and in the budget no more than $50).. I just want to split a 16MB connection into a separated 4 x 4 mb (theoretically)..

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  • Du Meter Log file

    - by Jack
    Where can I find the Du Meter Log file? I tried searching C:\ProgramData\Hagel Technologies\DU Meter but the folder is empty. I also tried C:\Users\Username\AppData\Roaming and Local and LocalLow but none of them even have a Du Meter or Hagel Technologies folder. I even tried searching the temp folder but still nothing. I have a NetMeter.csv log file that I want to try and replace over the Du Meter log file cause I can't seem to find any other way to import data into Du Meter.

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  • Setting up a download limit for a computer

    - by sprsr
    Hello all, A friend of me asked me a question like that,"I have a modem, and a house mate. He is using my modem, and slowing down my internet. What I want to do is, limit his bandwith without using any program like netlimiter or so. How can I do that?" What are the ways to do this ? Thanks.

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  • Are there any command line utilities which can calculate and/or limit how fast a pipe is running?

    - by stsquad
    I'm doing some basic stress testing of a Linux kernel network IWF with netcat. The set-up is fairly simple. On the target side: nc -l -p 10000 > /dev/null And on my desktop I was running: cat /dev/urandom | nc 192.168.0.20 10000 I'm using urandom for some poor-mans fuzz testing. However I find that even at this rate I can break something quite quickly. EDIT So I've been playing with trickle to rate limit how fast I'm generating data: cat /dev/urandom | trickle -u 10 nc 192.168.0.20 10000 But it's hard to tell if this is working. What would be really useful is a the pv equivilent of trickle that can work with pipes.

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  • Verizon FiOS Speed concerns

    - by Josh K
    I'm working on getting a separate internet connection to run out and I was looking into available options. FiOS claims to offer 25Mb up / 25 Mb down as a maximum rate. Do they have listed minimum rates? Is there anything with fiber I should be concerned about? Special hardware, special routers, availability concerns?

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  • .NET (C#) passing messages from a custom control to main application

    - by zer0c00l
    A custom windows form control named 'tweet' is in a dll. The custom control has couple of basic controls to display a tweet. I add this custom control to my main application. This custom control has a button named "retweet", when some user clicks this "retweet" button, i need to send some message to the main application. Unfortunately the this tweet control has no idea about this main application (both or in their own namespaces) How can i send messages from this custom control to the main application?

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  • PHP / javascript live chat using too much bandwidth

    - by David
    So I am learning about javascript, so I am making a live chat system with PHP and javascript. I have it so the javascript refreshes the log (each message gets logged in a file on the server), and it refreshes every second. Im using firebug to monitor the resource usage, and I see under the net tab each times its updated, and the bytes add up really fast. I know I can change it to update less, but is there a way that when a user on the other end I'm talking to, when the send a message, it gets sent to the server, then an alert gets sent to me saying that the chatlog needs to update somehow. That way it only updates when the log is updated. let me know, thanks

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