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  • Confusion about TCP packet analysis terms

    - by Berkay
    I'm analyzing our network and have some confusion about the terms: this is the 2-packet output from source to destination. from these i have to get some features as describe, pls make me clear... packets with at least a bytes of TCP data payload: it seems tcp.len0; The minimum segment size (confusion is headers are included or or not) The average segment size observed during the lifetime of the connection, the definition: is calculated as the value reported in the actual data bytes divided by the actual data pkts reported. Total bytes in IP packets, should be ip_len value. Total bytes in (Ethernet) The total number of bytes sent probably related to frame.len and frame.cap_len these two terms are describes as, also make me clear about these two terms. frame.cap_len: Frame length stored into the capture file frame.len: Frame length on the wire

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  • Database OR Array

    - by rezoner
    What is the exact point of using external database system if I have simple relations (95% querries are dependant on ID). I am storing users and their stats. Why would I use external database if I can have neat constructions like: db.users[32] = something Array of 500K users is not that big effort for RAM Pros are: no problematic asynchronity (instant results) easy export/import dealing with database like with a native object LITERALLY ps. and considerations: Would it be faster or slower to do collection[3] than db.query("select ... I am going to store it as a file/s There is only ONE application/process accessing this data, and the code is executed line by line - please don't elaborate about locking. Please don't answer with database propositions but why to use external DB over native array/object - I have experience in a few databases - that's not the case. What I am building is a client/gateway/server(s) game. Gateway deals with all users data, processing, authenticating, writing statistics e.t.c No other part of software needs to access directly to this data/database.

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  • Files listed by bash but unaccessible

    - by Cerin
    What would cause the following behavior on an Ubuntu 12.04 system? I've SSHed into a machine as the "ubuntu" user. Running ls -lah /data/* shows dozens of non-empty files (e.g. file1.txt, file2.txt, etc), all owned by the "ubuntu" user/group, and with full read/write access. If I try to cat /data/file1.txt, bash gives me the error "cat: /data/file1.txt: No such file or directory" In short, ls is listing files, but in every other way, the files essentially don't exist. I can't cat them or read them in any way. Even giving all the files 777 permission doesn't change anything. This is really bizarre. What's going on here?

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  • SSL certificate for ISAPI redirected Web Site

    - by Daniel
    I have a Win 2003 server and I'm using Ionics Isapi Rewrite Filter to redirect requests made to a Web Site configured in IIS to another Apache2 Server in a server not exposed to the Internet. The Web Site has its host headers configured to catch requests for the specific site, and the redirection is being done with the ProxyPass directive. This is working OK. So far the scenario, my question is: I'd like to add a server certificate to the Apache server, but I don´t know if I need to add the certificate to both Apache and IIS sites. I think I still don´t get the theory behind this and would like to know from someone with expertise in the field the right way to implement this. Thank you in advance.

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  • Word mergefield wildcard not correctly matching

    - by aZn137
    Hello, Below is my mergefield code: { IF { MERGEFIELD Subs_State } = "GA" "blah blah" "{ IF { MERGEFIELD CEOrgStates } = "GA" "blah blah" ""} "} I'm pulling records from a MS Access db. My goal is to check whether a record has Subs_State field matching "GA", or the CEOrgStates has the word "GA" (some records have stuff like "|FL|CA|GA|CT|KY|" (no quotes)). When I merged the docs, Word doesnt seem to be able to match with the wildcards: If I use and compare "*GA" (fields ending with GA), it works; however, the double wildcards "*GA*" dont seem to work at all. Here are the things I’ve tried: Have data in lowercase, then compare with lowercase Have data in lowercase, convert to and then compare with uppercase Do the opposite of the above 2 with uppercase data Use “*GA*” and “*ga*” (no pipe) Use different delimiters Nothing seems to work with the double wildcard matching. What am I doing wrong? Thanks!

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  • Upgrading NAS hard drives

    - by Mihai Damian
    I was thinking of buying a NAS for home-usage. I've never used a NAS or had HDDs set up in Raids. Before I commit myself to moving all my data to a NAS I need to find out how difficult it is to upgrade and replace the NAS' hard drives. Suppose I set up a Raid 1 NAS with two 1TB hdds. At some point in the future I will use up all the space and will have to install two new 2TB hdds. Now I'll need to migrate the data from the old disks to the new ones. Will I have to hook up one of the old disks in a computer and copy all the data back in the NAS? Or can the migration be done using only the NAS? I realize the answer to the question might depend on the NAS model. Being a simple for-home solution I was thinking of getting something along the lines of D-link's 323.

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  • Hanging page loads every n loads

    - by Christian
    Hi Guys I recently moved my site to a new server (Apache 2, PHP5, MySQL5). The site is an Invision based forum. Every few posts / topics it just hangs. The data has been written because if you stop and reload, the post / thread is there. I thought it was a write issue initially, but nope. So, the data is written but the page load never completes. It doesn't leave the page where the data has been input. Whats the best way to trouble shoot this issue? The only thing I have done recently is reduce my MySQL timeouts, but I can't see that being an issue as the values are still big enough and there are no mentions of timeouts in the MySQL log. (For the record there is nothing in PHP's error log either) Thanks in advance!

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  • Finding X on Excel scatter plot/trend line

    - by Wilka
    If I have some data in an scatter plot in Excel, e.g. X Y 1 10 2 20 3 30 4 40 5 50 and I want to find the Y value for X = 10, or X=3.5, or whatever (obviously this is a simplified example) I've been doing the following: Add a trend-line to the scatter plot data Format the trend-line to one that fits the data (linear in this case) Display the equation for the trend-line on the chart Type the equation into an empty cell, replacing x with a cell reference. E.g. "=10*A1" then put my X value into the cell A1 Is there a better way of doing this with Excel? It's quite a few steps, and fairly repetitive. Or maybe Excel is just a poor choice of application for doing this? (I'm using Excel 2007)

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  • SSH with X11 forwarding to host where I don't have a home-dir

    - by Albert
    I am trying to ssh with X11 forwarding into a host where I don't have a home directory. Because of that, xauth fails and X11 doesn't seem to work. I tried to specify a home-directory in advance but I guess it doesn't export env-vars to the host. zeyer@demeter:~> HOME=/tmp ssh ares -XY Password: Warning: No xauth data; using fake authentication data for X11 forwarding. Last login: Mon Mar 28 11:52:57 2011 from demeter.matha.rwth-aachen.de Have a lot of fun... Could not chdir to home directory /home/zeyer: No such file or directory /usr/bin/xauth: error in locking authority file /home/zeyer/.Xauthority zeyer@ares:/> Is there any trick I can make the X11 forwarding work? I still have write access to /tmp. But I am not sure how to setup the xauth fake authentication data manually.

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  • Serial port access errors in WINE

    - by goldenmean
    Hello, I have a setup in which I use a USB serial adapter + some application which sends and receives data using that serial usb. But this setup which works on a Windows, or even in a VMWare Virtual windows, does not work under WINE. IT transmits data but i cannot receive data. The cable and the applications are same as in the working and non-working scenarios. I guess The fact that the application works over the USB serial cable just as fine under Virtual Windows(VMware running on linux) by mapping /dev/ttyUSB to the com port, no external software/DLL needed, means it does not need any specific driver. (Am I correct in this assumption that application doesnt need any driver?) (I also tried with a different setup(different USB serial adapter + different application under WINE, but even that does not work under WINE, but it works fine under WIndows/Virtual Windows) How can I get it working under WINE? Any pointers appreciated.

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  • MySQL & tmpfs : performance

    - by Serty Oan
    I was wondering if, and how much, using tmpfs could improve MySQL performance and how it should be done ? My guess would be to do mount -t tmpfs -o size=256M /path/to/mysql/data/DatabaseName, and to use the database normally but maybe I'm wrong (I'm using MyISAM tables only). Will a hourly rsync between the tmpfs /path/to/mysql/data/DatabaseName and /path/to/mysql/data/DatabaseName_backup penalize performances ? If so, how should I make the backup of the tmpfs database ? So, is it a good way to do things, is there a better way or am I losing my time ?

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  • How to change location of Maildir/ in postfix mail system

    - by adesh
    I'm using Postfix with imap and pop servers running on ubuntu linux. I want to change the the location of Maildir folder from user's home directory to some other shared folder so that all mail is in one place. I also have problem sending local mails to users who does not have a home directory (e.g. www-data), the system users created by default. I'm getting the following error. postfix/local[32123]: DCE1D221BBD: to=<www-data@********>, orig_to=<www-data>, relay=local, delay=33, delays=33/0/0/0.12, dsn=5.2.0, status=bounced (maildir delivery failed: create maildir file /var/www/Maildir/tmp/1382169296.P32123.********: Permission denied) I'd like to have a folder structure similar to this: /all-mail/<user-name>/<mail-goes-here>

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  • Converting Outlook Express csv adress book and dbx files into Thunderbird on W7

    - by PiotrK
    Recently I changed my OS from XP to W7. I made backup of any Outlook Express messages (the dbx files and adress book as CSV). On W7 I want to import that data into Thunderbird. There is option for importing from Outlook Express, but it is looking for live application data (I can't specify directory with real files myself) and there is no Outlook Express installed on W7 so I can't just import it back to it and then into Thunderbird. How can I import that data into Thunderbird?

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  • Is mismatched firmware on drives in a raid-6 a bad thing?

    - by bwerks
    Hi all, I recently expanded a raid-1 to a raid-6 with six drives. I ordered all four of the new drives from the same place, and all of them were advertised to be the same drives as the original two--Seagate 15krpm 146gb. However, when I was looking at the drives in the perc6/i utility, one of them appeared to be an earlier firmware version; it had S515, compared to the other five drives with S527. Sure enough, after inspecting the drive itself, the label advertised the earlier firmware version. Running Dell's SAS firmware upgrade utility should have in theory moved them all up to S52A, but when I ran it it moved the S527 drives up to S52A, and left the S515 drive untouched. Is this something to be worried about? If it's something that should be corrected, is there a way to target a particular drive for upgrade since the firmware utility didn't seem to do it by itself?

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  • Printer monitoring script (PowerShell)

    - by HannesFostie
    I am going to write a script of some sort to check event viewer in a windows server 2003 for all printjobs, and then write them to a comma delimited textfile like printername_floor_room.txt I am wondering what the best way is to do this realtime, and keep checking the event viewer constantly. Any caveats I need to be aware of? Thanks EDIT: Okay, so I will most likely go for PowerShell and use Get-EventLog and then edit the "table" data. Problems I'm having: if I were to save all this data to a text file, how do I get the data out of it? A comma-separated file I could work with, but this, I'm not really sure. And once that is sorted out, I'm still not sure how to keep the file updated more or less real-time. Can I make this service-like, without hogging up all resources? Run it every x seconds for example?

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  • limit linux background flush (dirty pages)

    - by korkman
    Background flushing in linux happens when either too much written data is pending (adjustable via /proc/sys/vm/dirty_background_ratio) or a timeout for pending writes is reached (/proc/sys/vm/dirty_expire_centisecs). Unless another limit is being hit (/proc/sys/vm/dirty_ratio), more written data may be cached. Further writes will block. In theory, this should create a background process writing out dirty pages without disturbing other processes. In practice, it does disturb any process doing uncached reading or synchronous writing. Badly. This is because the background flush actually writes at 100% device speed and any other device requests at this time will be delayed (because all queues and write-caches on the road are filled). Is there any way to limit the amount of requests per second the flushing process performs, or otherwise effectively prioritize other device I/O?

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  • Move MySQL database while instance is online

    - by Mike Scott
    I have a MySQL instance containing a number of databases, one of which is an archive database (although using the INNODB rather than ARCHIVE storage engine) that is not queried or written to in normal operation. The data filesystem is filling up and I'd like to move the archive database's data directory to a different filesystem (and then symlink it back, obviously). If there are no SQL statements attempting to query or update the data during the move, can I safely do this while the MySQL instance and the other databases stay online and in use? I plan to rsync the database directory to the new filesystem, then rename the old one on the original filesystem to something different and create the new symlink. lsof reports that MySQL does have the .ibd files open, so presumably it would have to reopen them.

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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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  • What will happen with my RAID5 after motherboard change?

    - by abatishchev
    Currently I have ASUS P5Q-EM and 3 HDD in RAID5 using it's on-board RAID controller Intel ICH10R. I want to bye a new motherboard, for example, Gigabyte GA-EQ45M-S2 which also have on-board RAID controller, but Intel ICH10DO. What will happen with my data on RAID5? Will I have to re-create the array from the scratch and lost all my data? Is such array a soft RAID or soft-hard? What if my current motherboard will broken? What will happen with my data?

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  • Does Lapping a CPU / Heatsink actually drop the temp?

    - by Pure.Krome
    Hi folks, i've been watching some YouTube vids about Lapping a CPU. I've never heard of this modding technique before and, though extreame, I was wondering if it acutally works? Assuming you lap your cpu and/or heatsink correctly, will the temps drop? When I say drop, at least a 1 degree drop is success (for the debate of this topic). To keep this topic clean, please refrain from anyone commenting on the overkill of labour, just for a 1 degree (worst case) drop, etc. This is a discussion about the theory and concept, not personal opionion of wether to lap or not.

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  • How would I / could I obtain an reasonably comprehensive list of domain names?

    - by Simon
    I know that domain names are constantly changing, and I know there are a lot of them, but there is clearly a region of the domain name space which is stable. How would I go about getting a list, even a very big one? Such a thing must logically exist, even if it is in a distributed form, because the web's DNS servers resolve names to IP addresses. So in theory if I could poll all the DNS servers in the world at a moment in time I would have the complete list of mapped names. Is there a practical way of doing that? As an aside, does anyone have any good estimates of how many domain names exist at the moment?

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  • Amazon EBS root volume persistence

    - by hipplar
    When I launch a new Windows EC2 instance I am given a 30 gig root EBS volume. I'm trying to make sure I understand the EBS terminology and want to make sure I understand this correctly: Q: What happens to my data when a system terminates? The data stored on a local instance store will persist only as long as that instance is alive. However, data that is stored on an Amazon EBS volume will persist independently of the life of the instance. What exactly does "instance is alive" mean? If I write files to the root volume and reboot the instance will the files remain? Or do I physically have to terminate (delete) the instance for the root volume to go away? Thanks

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  • Getting live traffic/visitor analytics when using a reverse proxy

    - by jotto
    I'm in process of implementing Varnish as a reverse proxy for a Ruby on Rails app and I'm using Google Analytics (JS/client side script to record visitor data) but it's several hours delayed so its useless for knowing what's going on now. I need at a glance live data that includes referring traffic and what current req/sec is. Right now I am using a simple Rack middleware application to do the live stats (gist.github.com/235745) but if the majority of traffic hits Varnish, Rack will never be hit so this won't work. The closest solution I've found so far is http://www.reinvigorate.net/ but it's in beta (there are also no implementation details on their front page). Does Varnish have traffic logs that I can custom format to match my Apache logs so I can combine them, or will I have to roll my own JS implementation like GA that shows the data in real time?

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  • Rugged Netbook and software options for Running R statistical software?

    - by Thomas
    I am interested in purchasing a netbook to do field research in another country. My hardware specifications for the nebtook: -Be rugged enough to survive a bit of wear and tear -Fairly fast processing (the ability to upgrade from 1GB of RAM to 2GB) -A battery life of longer than 6 hours -At least a 10 inch screen -A decent camera for Skyping My software needs: -Be able run a Spreadsheet program to do basic data input (like Excel or Open Office) -Use the Open Source Statistical Program R to do basic data analysis (Regression, data analysis etc.) -Word Processing (Word or Open Office) Do you have any suggestions on which models or brands my fit my needs? Some of the models I was considering: Samsung NB-30 Toshiba NB 305 Asus Eee PC 1005HA Lenovo S10-2 Also any recommendations on the best software to load on the aforementioned Netbooks. I saw this resource from [livehacker][6] Any comments. Thanks for your help! -Thomas

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  • Load balance between two virtual directories on a single machine running IIS6

    - by Emil Lerch
    I'm trying to simulate a production environment using a single VM. The production environment will have 3 servers behind a load balancer with sticky sessions. Production will be using IIS6. For development, I have no need to distribute load, but I want to make sure the team does not write code that relies on a single-server module. I have been hoping to set up two virtual directories and find some isapi filter to perform some rudimentary software load balancing, but I've been unable to locate anything suitable. isapi_rewrite comes close but there's no ability for a random rewrite. I don't even need sticky sessions since the application does not (in theory) rely on them. Is there something easy/free to do this, or am I stuck with multiple VMs and a NLB setup (which seems like total overkill)?

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