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• proxy software that supports parallel transfer

  - by est

  Hi guys, I need to setup a really fast proxy server in a remote server, here's the scenario: The server prefetches 3KB of data, mostly HTTP resources. The server send to client 3KB of data, instead of traditional HTTP or SOCKS proxy, the server open multithreaded transfer with 3 connections, send 1KB of data per thread to each connection The client receives 1KBx3, and combine them to the original 3KB data, and return as a local HTTP proxy server. The client display the original data in browser via the local HTTP proxy The latency is not important as long as the transfer rate is good. Does any software like this exist? It's better if it's open source or free ones.

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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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• Network interface selection

  - by Antonino

  Hello. Suppose I have more than a network interfaces and I want to selectively use them per application. eth0 is the standard interface with the standard gateway in the main routing table eth1 is another interface with a different gateway. Suppose I launch an application as a user "user_eth1". I used the following set of rules for iptables / ip rules. IPTABLES: iptables -t mangle -A OUTPUT -m user --uid-owner user_eth1 -j MARK --set-mark 100 iptables -t nat -A POSTROUTING -m user -uid-owner -o eth1 user_eth1 -j SNAT --to-source <eth_ipaddress> IPRULE: ip rule add fwmark 100 lookup table100 and i build "table100" as follows (no doubts on that) ip route show table main | grep -Ev ^default | while read ROUTE; do ip route add table table100 $ROUTE; done ip route add default via <default_gateway> table table100 It doesn't work at all. What's wrong with this? Thank you in advance!

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• Why can't gif images copy at a reasonable speed on this dell laptop with XP?

  - by alt234

  I've got this somewhat old Dell Latitude D810. Strangest thing... If I try to copy anything that has gif files in it the gif files take forever. Like a few minutes per gif regardless of size. Everything else copies fine. I notice this when copying files off our network, copying off multiple external drives, and even when files are copying during an installation process. I'm on Windows XP Pro service pack 3. I've never seen anything like this before. Anyone else?

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• DDoS attacks to PBX

  - by user316687

  I'm wondering if DDOS attacks to PBX or telecommunications systems is possibe real. According to this links: http://threatpost.com/en_us/blogs/firm-sees-more-ddos-attacks-aimed-telecom-systems-073112 http://news.softpedia.com/news/DDOS-Attacks-Against-Telecom-Systems-Cost-as-Little-as-20-16-Per-Day-284875.shtml it is possible. There are DDOs attacks to web servers, which mostly give them so much concurrent loads or connections that service get unavailable. Many government or non-profit organizations that suffered this kind of attacks, eventually could choose to shutdown their web server and that's it, waiting for these attacks to end. For a DDOs attacks to PBX, I imagine that it would result in telephones getting busy or ringing all the time unstoppably. This kind of attack could really damage any kind organization. Is it possible to do that or are we just in the beginnings?

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• On Windows 7, how do I fix my cmd.exe icon and remove cruft from the jumplist

  - by sb3700

  Hi. When installing drivers for my Gigabyte motherboard, I installed a "Games" link which ran from a batch file. This was pinned to the taskbar by default. As a result, it changed the icon for cmd.exe to the icon for Games. I uninstalled the Games and it got rid of the icon leaving it with a white rectangle thing (I can post screenshots on request). There is also a link on the jumplist to open Games, which just opens a cmd window. I've tried rebuilding my icon cache as per Changing Windows 7 pinned taskbar icons, but this only removed the white rectangle icon, leaving me with no real icon. c:\windows\system32\cmd.exe still has the appropriate icon in explorer, just not on the taskbar. Any ideas on how to fix this annoyance?

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• Misbehaving Network Printers - options?

  - by Dan Kelly

  We are having some issue with printers on our network. We have 3 floors, 2 printers per floor (A3 & A4) all connected to the same Print Server. The issue is that the same printer may not behave the same on two different, seemingly identical desktops. The commonest place this is seen on our bulk print script in AutoCAD - occasionally drawings may print Landscape on Portrait paper, despite drawings always being Landscape... Does any one have any suggestions on what we can check / try? The current line of attack is to setup a new Print Server, with the HP universal print driver rather than the device specific drivers, and replace printers using exactly the same method on all desktops. Sound good?

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• Change/Deactivate the shell for an amount of users on SUSE Enterprise Server

  - by Manfred Schmidt

  I have a SUSE Server to which ~300 users are connecting. About 100 of them have to be deactivated. I think it would be nice to change their shell to /bin/false either with chsh or with usermod. Do I have to type every command per line, or can I fill out a list of users which can be read from the script? I should mention that all of the 100 users have the same ending in their username. Can I work with wildcards here? e.g. usermod -s /bin/fish *ftpuser chsh -s /sbin/nologin *ftpuser

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• Advantages of a deployment tool over shell

  - by Jimmy

  Currently I have all of my deployment scripts in shell, which installs about 10 programs and configures them. The way I see it shell is a fantastic tool for this: Modular: Only one program per script, this way I can spread the programs across different servers Simple: Shell scripts are extremely simple and don't need any other software installed One-click: I only have to run the shell script once and everything is setup Agnostic: Most programmers can figure out shell, and don't need to know how to use a specific program. Versioning: Since my code is on github a simple git pull and restart all of supervisor will run my latest code. My question is, with all of these advantages, why is it people are constantly telling me to use a tool such as ansible or chef, and not to use shell.

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• Why does PsExec hang after successfully running a powershell script?

  - by Matt

  The script is fairly straight forward. Simply tries to start a bunch of windows services. Execution locally works fine when on the target machine. The script is actually executing fine as well when done via PsExec, it just never returns until I hit the "enter" key on my CMD prompt. This is a problem, because this is being called from TeamCity, and it makes the Agent hang waiting for PsExec to return. I've tried the following: Adding an exit and exit 0 at the end of the Powershell script Adding a < NUL to the end of the PsExec call, per the answer in this SF question Adding a > stdout redirect This is how I am actually calling psexec: psexec \\target -u domain\username -p password powershell c:\path\script.ps1 No matter what I do, it hangs until I the locally on the cmd prompt. After I hit enter, I get the message: powershell exited on target with error code 0.

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• Windows 7 - Remote Desktop - multiple credentials

  - by w-

  Hi, My home network consists of a couple XP machines and a windows 7 box. One of the XP boxes is like a shared server accessed via Remote Desktop. I have an account on there and my gf has another. Previously I was able to save RDC shortcuts to this shared server including credentials. So in order to access the server from a computer on the network, i just needed to open the shortcut. I thus would have two shortcuts, one for my account and one for my gf's. In windows 7, it seems to store credentials for a box based on machine name. i.e. i can only store one set of credentials per machine name. This seems incredibly stupid so my question is: In windows 7, is there some way to have RDC shortcuts that use different credentials to login to the same target box? thanks

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• Xmodmap configuration

  - by Krishna S

  On my Debian Linux machine Ctrl+Alt+F1 is bound to a virtual terminal. I can see the corresponding entry by running xmodmap -pke keycode 67 = F1 XF86_Switch_VT_1 F1 XF86_Switch_VT_1 Per this thread, which I might add is consistent with what I've read elsewhere, the columns on the right hand side of = correspond to key, Shift+key, AltGr+key and Shift+AltGr+key. Given that, I don't understand how the keycode mapping for F1 (above) works for Ctrl+Alt+F1. It seems it should really be either Shift+F1 or Shift+AltGr+F1? Here's the output of xmodmap -pm on my machine: shift Shift_L (0x32), Shift_R (0x3e) lock Caps_Lock (0x25) control Control_L (0x42), Control_R (0x69) mod1 Alt_L (0x40), Alt_R (0x6c), Meta_L (0xcd) mod2 Num_Lock (0x4d) mod3 mod4 Super_L (0x85), Super_R (0x86), Super_L (0xce), Hyper_L (0xcf) mod5 ISO_Level3_Shift (0x5c), Mode_switch (0xcb) Can anybody explain it?

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• cygwin rsync over ssh very slow

  - by Waleed Hamra

  I have 2 machines running Windows Xp SP3. I have cygwin installed on both, version 1.7. I have rsync and ssh installed on both, and configured using default settings as per ssh-host-config and ssh-user-config programs provided. I moved the public keys into their respective locations, and basically ssh is working fine. i began an rsync operation, using: rsync -av --delete --hard-links local_dir username@other_machine:/some_dir well... on both machines, the processor is running near idle, no heavy usage. I checked IO using process explorer on both machines, and that too is at normal levels (1~2 MB/s), so I can't see where the bottlenecks are, because network performance is aweful. I'm not going over 1MB/s... when a normal file copy using windows sharing achieves some ~10 MB/s.. What could be wrong?

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• Setup CENTOS Centralized AUDIT and RSYSLOG server

  - by Warron.French

  Attempting to use these links: Sending audit logs to SYSLOG server or http://wiki.rsyslog.com/index.php/Centralizing_the_audit_log I have been unable to get centralized AUDIT logging to work on my ALL-CentOS network environment. I have 6 workstations dt1...dt6, and the log files are not generated at all and I cannot tell if the messages are being sent from these workstations: dt1..dt6 over to the server (srv1). I have configured the rsyslog.conf on the workstations as shown in the link: Sending audit logs to SYSLOG server, and add the additional touches for generating the logfiles into a separate directory per YEAR/MONTH/DAY (using proper syntax) and into separate HOSTNAME-based_audit.log files. Note: RSYSLOG messaging does appear to work from the workstations over to the server, but the audit logging portion is not working. I am running CentOS-6.5 with RPMs: audit-2.2-4.el6_5.x86_64, audit-libs-2.2-4.el6_5.x86_64, and rsyslog-5.8.10-8.el6.x86_64 I have gotten zero responses from wiki.rsyslog.com and really need this to work. If needed I can send files of one of my workstations and the server to aid in the process. Thanks, Warron

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• WinXP on VPC - Unable to change the way users log on or off

  - by kamleshrao

  On my Win7 computer, I have setup a new Win-XP VPC. In the VPC window, when I click Ctrl+Alt+Del, it shows me Windows Task Manager. As per MS KB [ http://support.microsoft.com/kb/281980 ], we can change this behavior to show the regular Windows Security window. But while making this change, I am getting the following error: User Accounts Fast User Switching cannot be turned off from a remote connection to this computer. Log on to the computer locally to turn off Fast User Switching. OK Is there any way I can fix this setting?

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• How to extend a window on 4 virtual desktops on Windows 7

  - by Patrice

  This site is very cool, and i often get many answers in it :) But today, I've a question for you. My Problem is: - I want to use a virtual desktop or resolution expander for windows 7 - I want to multiply per 2 a window resolution (i.e. seeing only 25% of one window on a screen) I tried simple tricks that didn't work for me, and installed a virtual desktop (Dexspot, a great one), but I can't manage to strech a window (Google chrome) over the 4 desktops simultaneously. Do you understand my problem, and have an answer to it? This would be great help ;-) See ya! Patrice

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• identifying windows service

  - by András

  On my win7 machine when I watch a movie in XBMC, once per hour the desktop regains the focus. The movie keeps playing, but in the background now, so I can only hear it. It is quite irritating. I noticed, that the Windows Application log always contains two entres for this time: "The description for Event ID 0 from source Self-service Plug-in cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer." One entry is for starting, and one for stopping 60 seconds later. This keeps repeating, every two starts 3600 seconds apart. How can I repair it? How can I find out which service it is?

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• What is the specific advantage of a blade server for virtualisation?

  - by ChrisZZ

  We are planning to implement a VDI Solution. We had some discussions about Blade vs Rack. As we are only planning to implement 75-100 Clients, we calculated, that we would need 2 Servers with Dual 8C Processors - and a shared storage server. This calculation is based on a paper by ORACLE, that says, 12 active virtual machines per core. Now, for buying to servers, a blade does not scale financially. But the Blade has some other advantages: a) The interconnectivity between the blades is super-fast. b) IO Virtualisation Are there other advantages, that we should consider, that would make up for price - and are this advantages so important, that we should think about investing in the blade?

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• Parent control software for iPhone

  - by Fraser Orr

  My kids both have iPod Touches and I'd like to apply some parental controls. I have had a look and I know there are some really limited features on the phone itself, and a variety of filtered browsers. However, none of them are really hitting what I want. The features I am looking for are: Filtered web (as above) Filtered access to Youtube and music Control over how often they are allowed to play games (like 1 hour per day) Whitelist control over who they can skype (or maybe facetime, but I am an android user so can't hook that net.) Any suggestions?

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• What is "queued Windows Error Reporting"?

  - by Rewinder

  I was cleaning up my laptop hard-disk, running Windows 7, and as part of the process I ran the Disk Cleanup utility. To my surprise I saw 2 items in the list that were quite large (both ~300MB). Per user queued Windows Error Reporting System queued Windows Error Reporting I guess I had never noticed these, because they were never that big. So, what are these items? Any particular reason why they became so large all of a sudden? And finally, is it safe to remove them?

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• How to have a soft-real-time process in presense of heavily swapping IO-intensive background load?

  - by Vi

  schedtool: PID 32301: PRIO 4, POLICY R: SCHED_RR , NICE -20, AFFINITY 0xf ionice: realtime: prio 4 But the music is stumbling anyway. Background load is low prio (SCHED_IDLEPRIO, idle ionice), but uses a lot of memory (more than is physically available) and does a lot of IO and calculations. Latencytop shows about 1500ms for: Following symlink Writing buffer to disk (sync) Page fault Writing a page to disk both for the bg load and for unrelated processes. Load average is 10 and counting. Why cannot it allocate, for example, 200MHZ of one of the cores and 32M of memory and not less than once per second opportunity for IO for mplayer to make it happy while continuing calculations on the background? Or: why it cannot leave background task and swap loving each other but keeping the rest of the system as if there were no background load? How to have RT processes AND heavy bg load simultaneously (without of virtual machines)?

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• If i make a mail server can i send bulk email?

  - by Jake Smith

  I work for a small company and we have fallen into the fad of "email campains" a.k.a Junk mail. So far the company has gotten a subscriber list from our website, and paid a good chunk of change for a emailer program. The problem is, Our list has close to 4,000 people on it and growing. with gmail only allowing 100 emails per account through on SMTP and I am on a tight budget so I cant hire anyone else. I was thinking of doing a dedicated mail server off of the website server we have running in the office. Is it possible? to make emails on your own server, and then send it through your own SMTP? if it is, what software would I need and is if free or low cost at least. We run a WAMP server, i set it up just for information, but i could switch it to lamp or whatever if need be. Thank you for your time and youre answers

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• how limit the number of open TCP streams from same IP to a local port?

  - by JMW

  Hi, i would like to limit the number of concurrent open TCP streams from the the same IP to the server's (local) port. Let's say 4 concurrent conncetions. How can this be done with ip tables? the closest thing, that i've found was: In Apache, is there a way to limit the number of new connections per second/hour/day? iptables -A INPUT -p tcp --dport 80 -i eth0 -m state --state NEW -m recent --set iptables -A INPUT -p tcp --dport 80 -i eth0 -m state --state NEW -m recent --update --seconds 86400 --hitcount 100 -j REJECT But this limitation just messures the number of new connections over the time. This might be good for controlling HTTP traffic. But this is not a good solution for me, since my TCP streams usually have a lifetime between 5 minutes and 2 hours. thanks a lot in advance for any reply :)

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• Server suddenly running out of entropy

  - by Creshal

  Since a reboot yesterday, one of our virtual servers (Debian Lenny, virtualized with Xen) is constantly running out of entropy, leading to timeouts etc. when trying to connect over SSH / TLS-enabled protocols. Is there any way to check which process(es) is(/are) eating up all the entropy? Edit: What I tried: Adding additional entropy sources: time_entropyd, rng-tools feeding urandom back into random, pseudorandom file accesses – netted about 1 MiB additional entropy per second, problems still persisted Checking for unusual activity via lsof, netstat and tcpdump – nothing. No noticeable load or anything Stopping daemons, restarting permanent sessions, rebooting the entire VM – no change in behaviour What in the end worked: Waiting. Since about yesterday noon, there are no connection problems anymore. Entropy is still somewhat low (128 Bytes peak), but TLS/SSH sessions have no noticeable delay anymore. I'm slowly switching our clients back to TLS (all five of them!), but I don't expect any change in behavior now.

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• One vs. many domain user accounts in a server farm

  - by mjustin

  We are in a migration process of a group of related computers (Intranet servers, SQL, application servers of one application) to a new domain. In the past we used one domain user account for every computer (web1, web2, appserver1, appserver2, sql1, sqlbackup ...) to access central Windows resources like network shares. Every computer also has a local user account with the same name. I am not sure if this is necessary, or if it would be easier to configure and maintain to use one domain user account. Are there key advantages / disadvantages of having one single user account vs. dedicated accounts per computer for this group of background servers? If I am not wrong, one advantage besides easier administration of the user account could be that moving installed applications and services around between the computers does not require a check of the access rights anymore. (Except where IP addresses or ports are used)

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