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  • configure /etc/hosts file so ALL applications always use local network when it makes sense to do so?

    - by gkdsp
    I have two Linux CentOS servers setup in a local network. ServerA is 192.168.0.1 and serverB is 192.168.0.2. There's an application on serverA that communicates with serverB using host2.serverAname.com. But, the traffic is blocked on serverB because the port being used has a firewall that only allows traffic on the local network to pass. Thus, serverB needs to see traffic from serverA as originating from 192.168.0.1 (instead of host2.serverA.com). Is there a way I can configure the /etc/hosts file to ensure traffic always sent between the two servers uses local IP addresses, regardless of what hostname is in use, and for ALL applications? If so, could someone walk me through an example? I only have 2 servers, so the simpler the better.

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  • open mysql to any connection on ubuntu

    - by ThomasReggi
    I simply want to open up mysql to be accessible from any server ip. I have already commented out the bind-address in /etc/mysql/my.conf. I have already setup the user account within mysql. I have no clue whats stopping me from connecting. The more challenging I see this being the more I realize how much of a security risk it is, and I get that, I just want to be able to do it temporarily. I think that the iptables firewall is the last thing that is preventing me from achieving this, but sudo iptables -A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT is seemingly doing nothing.

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  • PFSENSE and IPV6 , direct connect rules

    - by Bgnt44
    My question is about pfsense configuration for ipv6 In theory Ipv6 are fully routable even in a LAN For stating point i ve Using this tutorial : http://doc.pfsense.org/index.php/Using_IPv6_on_2.1_with_a_Tunnel_Broker So my Lan network has ipv4 connection and ipv6 I would like to be able to access my LAN machines by their IPV6 i'm confused with firewall rules which i need to set to be able to do that Even if i set all interfaces to pass all packets, i'm not able to directly access any machine by their IPV6 Did i miss something ? Edit : Ok i found that it work now, think it has always work but my isp seems to support ipv6 sometimes and sometimes not ... weird

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  • Advise on VMWare hardware requirements and host OS

    - by edwin.nathaniel
    Hi All, I'm a newbie developer wanting to learn a bit about Virtualization (from the IT point of view, not theoretical/academic). What I'd like to do: Prepare a machine Install VMWare or VirtualBox Prepare 3 Guest OSes (one for Win2k8 server, 2 for Ubuntu Server) Win2k8 will run SQL Server 2k8 and IIS (for ASP.NET MVC deployment) 1 Ubuntu Server for Drupal, SugarCRM, MediaWiki, typical LAMP stuff 1 Ubuntu Server for Java (Tomcat/Jetty + MySQL/PostgreSQL) What I'd like to know: What would be the ideal Host OS such that the Host OS should not spend too many resources on itself but should boost these instances of VMs (e.g: does Win2k8 performs better vs Linux?) What would be the ideal machine for this (preferably AMD base chip) I'm not expecting the best performance out of this setup, just a decent one to host one drupal instance, one ASP.NET MVC (future, not now), and one Tomcat/Jetty instance. NB: If you have a better suggestions on the setup, feel free to let me know (e.g: maybe Drupal and Tomcat can be in one instance but move the database to another instance instead of 1 instance map to 1 webserver and 1 dbserver). Thank you.

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  • Hardware, network infrastructure for runnng gaming server nd on VirtualGL

    - by archer
    Foud nice project VirtualGL (http://www.virtualgl.org/). Tried to run 3D fames (EVE Online, Prototype) on server and display the output on thin client using 100Mbps network. Server: Gentoo Linux on AMD Phoenom II x6 3.4Gz, 8GB RAM, 2x NVIDIA 9800 GTX in single session with display resulution 1024x768 on client. Performance is very promising. Going to increase network speed to 1Gbps (using either Ethernet or Fiber) and run 5-6 clients simultenously. My questions are: a) what would be better for network - 1Gbps Ethernet or Fiber (clients are distributed in max 20m around server)? Is that a must to use managed switch for better network performance? b) Should I increase number of video cards to put in SLI on server (going to use Gigabyte GA-890FXA-UD7 which has 6 PCIExpress slots [2 x4, 2 x8 and 2 x16]). Will it impact performance significantly. If I need to increase the number of video cards - what would be better - put 2 banks of video cards with 3 in bank using SLI, or 3 banks with 2 in the bank? Would linux recognize that and properly use all banks of video cards? c) any suggestions on good thin clients supporting 1920x1080 HDMI video and 1Gbps network I understand that my questions can't be answered clearly (unless someone already managed to use this kind of stuff ;)) although any suggestions would be very helpful.

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  • Surface (Pro) Soft Keyboard + Hardware Keyboard Issue

    - by Matt Clark
    When I got my Surface Pro 2, I loved it, and everything seemed to work flawlessly, until, wait for it, windows updates... The issue that I am having is the following, I primarily use the TC (TypeCover), as the Pro is an out-of-office laptop replacement for me, that I can still use to do whatever I need, but there are times when I will flip the cover, and use the system in tablet mode. The problem is that even when the TC is attached, any text field I click on, causes the OSK (on screen keyboard) to appear, as if I was running the system in tablet mode. As soon as I press a single button on the TC, the OSK is dismissed. When I first got the system, this was NOT the case, and it functioned as it should, where the OSK will only appear if the TC was not present. The biggest problem that I am having is the fact that the OSK causes the windows to be resized. Maximized windows will be shrunk, and stretched to their previous state, however a window that is not maximized will stay in its shrunken state, after the OSK has been dismissed. Below are pictures that show what is happening. Has anyone else experienced this issue? And is there any way to fix it? As you might imagine, having spent a pretty penny on a device like this, it it quite an annoying bug that needs fixing. I have been dealing with this issue for about 3 months now.

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  • iptables forward rule not working in openwrt

    - by Udit Gupta
    I am trying to apply some iptables forwarding rules in openwrt. Here is my scenario - My server has two cards ath0 and br-lan. br-lan is connected to internet and ath0 to private network. The other m/c in n/w also has ath0 that connects with this server's ath0 and they are able to ping each other. Now, I want other m/c in network to use internet using br-lan of server so I thought of using iptables forwarding rule- Here is what I tried - Server : $ ping 1.1.1.6 // <ath0-ip of client> works fine $ iptables -A FORWARD -i ath0 -o br-lan -j ACCEPT $ /etc/init.d/firewall restart Client : $ ping 1.1.1.5 // <ath0-ip of server> works fine $ ping 132.245.244.60 // <br-lan ip of server> (not working) I am new to iptables stuff and openwrt. What I am doing wrong here ?? Any other help if anyone could suggest for my scenario Edit- m/c - machine n/w - network

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  • Linux HA - Best Heartbeat hardware solution

    - by Martino Dino
    Hi all I would ask anyone what is the best layer 2 medium for heartbeat in Linux and how it's best configured. More precisely I've been thinking about a dedicated NIC for that purpose but then i thought that if a switch breaks then i would loose the heartbeat connection for most of the cluster and STONITH 'BUM'!!! Will probably loose my job after :) Distributing the heartbeat onto the main NICs of every node trough a vif sounds reasonable but im not sure if this is the best option (at least the switches are redundant to some extent). Is it possible to use heartbeat over a bonded interface and that sounds reasonable? Do you have any other tip/solution for that issue?

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  • OSX: Why does an uninstalled program ask for inbound connections on login? How do I fix this?

    - by CT
    I uninstalled an application using AppZapper called PdaNet. It is a tethering application for my phone. Now every time I login, I am asked if I would like to allow inboud connections from PdaNet by the firewall. A search for PdaNet with spotlight does not return any results. PdaNet creates its own Ethernet in network preferences. This hung around after uninstall. I deleted it but it did not make a difference. Any ideas? Mac OS X 10.6.4

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  • How do I expose a webapp on :8090, even though firewall allows only :80 and :22

    - by Kaustubh P
    I am a noob in Server related stuff, so bear me. I use amazon webservices (EC2) on which I have a webapp running on jetty, which runs on port 8090. I deploy the webapp through the usual method of java -jar start.jar So then to access the app, I have to add a port in the URL, like this: someIP:8090/app But just typing someIP in the browser takes me to a page that shows It works! This is the default web page for this server. The web server software is running but no content has been added, yet. which I assume is apache. I have apache, tomcat and jetty installed. What can I do so that I dont have to specify the port? Do I have to perform port-forwarding? Thanks a lot.

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  • tcp flags in iptables: What's the difference between RST SYN and RST and SYN RST ? When to use ALL?

    - by Kris
    I'm working on a firewall for a virtual dedicated server and one of the things I'm looking into is port scanners. TCP flags are used for protection. I have 2 questions. The rule: -p tcp --tcp-flags SYN,ACK,FIN,RST SYN -j DROP First argument says check packets with flag SYN Second argument says make sure the flags ACK,FIN,RST SYN are set And when that's the case (there's a match), drop the tcp packet First question: I understand the meaning of RST and RST/ACK but in the second argument RST SYN is being used. What's the difference between RST SYN and RST and SYN RST ? Is there a "SYN RST" flag in a 3 way handshake ? Second question is about the difference between -p tcp --tcp-flags SYN,ACK,FIN,RST SYN -j DROP and -p tcp --tcp-flags ALL SYN,ACK,FIN,RST SYN -j DROP When should ALL be used ? When I use ALL, does that mean if the tcp packet with the syn flag doesn't have the ACK "and" the FIN "and" the RST SYN flags set, there will be no match ?

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  • Best SQL Server Configuration with this hardware.

    - by DavidStein
    I just received my new SQL Server from Dell. The server will be serve approximately 15 OLTP databases which average 10GB in size. Here are the basic specs: Dell PowerEdge R510 with up to 12 Hot Swap HDDs,LED Intel Xeon E5649 2.53GHz, 12M Cache, 5.86 GT/s QPI, 6 core (Quantity of 2) 48GB Memory (6x8GB), 1333MHz Dual Ranked RDIMMs for 2 Processors, Optimized PERC H700 Integrated RAID Controller, 1GB NV Cache 300GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 4) 600GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 6) My first thought was to use 3 arrays. OS - Raid 1 - (2)300GB T-Log - Raid 1 (2)300GB DB - Raid 5 (5) 600GB Backup - (1) 600GB - non-raided. However, I could also do the following after purchasing one more drive for backup. OS and T-Log - Raid 10 - (4)300GB DB - Raid 10 (6)600GB The hard drive space is not an issue as the databases are not that large. I'm just trying to optimize the speed of the applications using these databases. So, what would you guys recommend?

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  • "Safely remove hardware"...doesn't.

    - by Kev
    I have an external USB harddisk that I have scripted to safely shut down after a backup, so the backup operator can unplug it, and knows not to if the lights are still on for some reason. It's always worked fine using the DevEject command-line utility. This week it failed for some reason: DevEject 1.0 2003 c't/Matthias Withopf Ejecting 'USB Mass Storage Device' [USB\VID_0411&PID_002A\00000704C8D2]...FAILED (23,5) Error ejecting device USB Mass Storage Device, vetoed (15,5)! Worse yet, using the SRH tray icon, I click Stop, click OK, it pauses about 5 seconds with OK and Cancel greyed out, closes the sub-window, and then the main window with the Stop button still shows the device, and Stop is still available. I can keep doing that and it never gets rid of the device. I can still access it in Explorer. LockHunter reports that nothing is locking the drive. I've made no changes to the backup configuration or anything to do with the drive this week. Why the sudden flake-out? Short of a restart, which I can't do today before the backup operator goes home, how do I fix it?

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  • Hardware and Software Working Together - What Does LJE say?

    - by Stephen Slade
     IDG News Service - Oracle CEO Larry Ellison said Oracle will continue to bet on selling high-end custom hardware for its software products, even amidst a growing trend toward roomfuls of cheap, generic servers. "You have to be in the hardware business and the software business, to get the best possible system," he said during a keynote speech at Oracle's OpenWorld conference in Tokyo. "We believe it's the right idea, we believe it's the next generation of computing, we believe all the pieces have to fit together." Ellison, as he has often done in the past, repeatedly referred to Apple as his "favorite example" of such tight integration. He was a close friend of Apple's co-founder Steve Jobs and previously served on Apple's board of directors.He said sales of Oracle's advanced servers were booming and generating around a billion dollars a year in revenue for the company, which has until recent years focused almost exclusively on its software offerings. With the explosion of popular online services and the increasing number of mobile devices that access them, demand is high for databases that can quickly respond to high numbers of relatively simple queries. While Oracle is pitching its expensive, finely-tuned machines to meet this requirement, Internet behemoths like Google, Facebook and Microsoft increasingly rely on armies of low-cost, easily replaceable servers. Ellison emphasized the high specifications of Oracle's servers, which come packed with multiple terabytes of RAM and flash-based storage for speed. Such machines are superior to large server farms, he said, because they require far less electricity and floor space, and are also cost competitive. When asked about whether purchasing such products would lock customers in to expensive hardware from Oracle, he promised that the company's software would always run on "multiple hardware sources."  Ellison, who spoke from Kyoto, Japan's ancient capital, was shown live online via webcast. The Oracle founder has a fondness for Japanese architecture and is staying in his large garden residence in the city Source: Ellison: Hardware-software integration key, Apple is best example. Oracle's founder and CEO reaffirmed his commitment to custom hardware for its software products  LINK to Computerworld article Apr 5, 2012 http://www.computerworld.com/s/article/9225858/Ellison_Hardware_software_integration_key_Apple_is_best_example?source=CTWNLE_nlt_entsoft_2012-04-09&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+computerworld%2Fs%2Ffeed%2Ftopic%2F173+%28Computerworld+Databases+News%29#disqus_thread

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  • How to block a program from using IPv4?

    - by Ian Boyd
    I have a program that can communicate over IPv4 (TCP and UDP) and over IPv6 (TCP and UDP). I want to block the program from being able to use IPv4. I tried the Windows Firewall: Except it blocks IP sub-protocols (e.g. TCP, UDP, encapsulated IPv6, GRE), rather than blocking IPv4 itself. In other words, I need to block IPv4: IPv4/TCP IPv4/UDP IPv4/ICMPv4 IPv4/GRE IPv4/L2TP while allowing IPv6: IPv6/TCP IPv6/UDP IPv6/ICMPv6 IPv6/GRE IPv6/L2TP Can I block a program from using IPv4? Note: If it cannot be done, then don't be afraid to add that as an answer. There's no shame in giving the correct answer to a question.

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  • BIOS password and hardware clock problems

    - by Slartibartfast
    I have HP 6730b lap top. I've bought it used and installed (Gentoo) linux on it. BIOS is protected with password, and guy I bought it from said "I've tweaked BIOS from Windows program, it never asked me for password". I've tried to erase password by removing battery, but it's still there. What did get erased obviously is hw clock. This is what hapends: a) I can leave lap top in January 1980 and it works b) I can correct system time, but boot wil fail with "superblock mount time in future" from where I need to manually do fsck and continue boot c) I can correct system time and sync it with hwclock -w but than it will behave as b) and it will reset BIOS time to 1.1.1980 00:00 So I need either a way to bypass a BIOS password (wich after lot of googling seems impossible),a way to persist a clock, or a setup that will enable hw clock in eighties, system clock in present time and normal boot.

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  • I can't do a Remote Assistance session to a Windows XP box from Windows 7.

    - by superkinhluan
    My Mom's computer is running Windows XP, and my desktop running Windows 7. She's having some technical issue, so I want to do a Remote Assistance session to her machine. However, no matter what I've tried, the Remote Assistance program doesn't connect successfully. I've verified that the Windows Firewall (on both my and her machines) is configured properly to allow Remote Assistance program to go through. What's interesting is that I have the same problem when I try to do Remote Assistance from my desktop to my laptop, which is also running Windows XP. However, when I try to connect to my girlfriend's machine, which is runninng Windows 7 this time, the connection is successful. So in the end, I guess there must be some incompability between Windows 7 and Windows XP. Does anyone experience the same issue? How did you resolve it?

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  • Port forwarding does not work always?

    - by ITFan
    I opened port 25374, this is eMule TCP port, then I use canyouseeme.org to check if it is really opened. I got the weird problem : when eMule is running, canyouseeme.org see my port. I got the message : "Success: I can see your service on xxx.xx.xxx.xx on port (25374) Your ISP is not blocking port 25374" When I close eMule then check the port again on canyouseeme.org I got : Error: I could not see your service on xxx.xx.xxx.xx on port (25374) Reason: Connection timed out But when I turn off the windows firewall I got a different error : Error: I could not see your service on xxx.xx.xxx.xx on port (25374) Reason: Connection refused Can anyone please explain to me why it happened like that and how to make the port always opened ? Thanks

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  • How to remove a virus that trigger the internet explorer every some minutes?

    - by Hoang
    Some days ago, I got a file in Windows Live Messenger by an account of my friend, I thought it was a normal file because he normally sent me some files as well. But this time, I had no luck, he got the virus from someone else. I don't know what happens in my computer excepts that my computer hard disk runs as mad and every some minutes it trigger the internet explorer to launch some ads page, includes doubleclick, cam4, motor, etc.... How do I remove this virus from my computer? I don't have any virus program installed yet. My computer os: Windows Vista, the Windows Firewall is disabled somehow that I could not reenable it.

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  • How to configure remote access to multiple subnets behind a SonicWALL NSA 2400

    - by Kyle Noland
    I have a client that uses a SonicWALL NSA 2400 as their firewall. I need to setup a second LAN subnet for a handful of PC. Management has decided that there should be a second subnet even though intend to allow access across the two subnets - I know... I'm having trouble getting communication across the 2 subnets. I can ping each gateway, but I cannot ping or seem to route traffic fron subnet A to subnet B. Here is my current setup: X0 Interface: LAN zone with IP addres 192.168.1.1 X1 Interface: WAN zone with WAN IP address X2 Interface: LAN zone with IP address 192.168.75.1 I have configured ARP and routes for the secondar subnet (X2) according to this SonicWALL KB article: http://www.sonicwall.com/downloads/supporting_multiple_firewalled_subnets_on_sonicos_enhanced.pdf using "Example 1". At this point I don't minding if I have to throw the SonicWALL GVC software VPN client into the mix to make it work. It feel like I have an Access Rule issue, but for testing I made LAN LAN, WAN LAN and VPN LAN rules wide open with the same results.

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  • Set up DPM to use hardware VSS Provider with EMC Clariion SAN

    - by Ryan
    We recently purchased an EMC Clariion AX4 SAN and we're using it to provide storage for our Hyper-V virtual machines. I've already got the servers registered with it and configured the failover cluster CSV's, etc. I'm wanting to figure out what I have to do to set up the VSS Provider for the SAN, so that Microsoft Data Protection Manager can use it to backup the virtual machines. I'm new when it comes to Clariion SAN's, so I have no idea how to set up the VSS provider. I downloaded something from Powerlink that was labeled VSS Provider and installed it on one of the machines connected to the SAN. It had something to do with a Solutions Enabler (I don't know what that is), but it doesn't really seem like it did anything. I read something that suggested I'd need to have Navisphere Manager to use the VSS Provider on the AX4, but we didn't purchase that - we're just using Navisphere Express. Can anyone help me figure out how to get the VSS Provider up and running?

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  • mystery Internet traffic to port 445

    - by Ben Collver
    Recently, I noticed traffic from the office network to TCP port 445 on the Internet [a]. Below are the Linux firewall log entries to Facebook's network [b] and Google's network [c]. I would like to identify the source of this traffic. My first guess is that Facebook and Google might be using multiple TCP ports for SSL load balancing. However, I could not confirm this based on the web proxy logs. What else might it be? [a] http://support.microsoft.com/kb/204279 [b] Sep 4 08:30:03 firewall01 kernel: IN=eth0 OUT=eth2 SRC=10.0.0.131 DST=69.171.237.34 LEN=52 TOS=0x00 PREC=0x00 TTL=127 ID=14287 DF PROTO=TCP SPT=51711 DPT=445 WINDOW=8192 RES=0x00 SYN URGP=0 [c] Aug 28 06:02:41 firewall01 kernel: IN=eth0 OUT=eth2 SRC=10.0.0.115 DST=173.194.33.47 LEN=52 TOS=0x00 PREC=0x00 TTL=127 ID=4558 DF PROTO=TCP SPT=49294 DPT=445 WINDOW=8192 RES=0x00 SYN URGP=0

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  • methods for preventing large scale data scraping from REST api

    - by Simon Kenyon Shepard
    I know the immediate answer to this is going to be there is no 100% reliable method of doing this. But I'd like to create a question that details the different possibilities, the difficulty of implementing them and success rates. I would like to go from simple software ip/request speed analysis to high end sophisticated soft/hardware tools, e.g. neural networks. With a goal of predicting and preventing bogus requests and attempts to scrape the service. Many Thanks.

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  • Bridge and OpenVPN with shorewall

    - by Javier Martinez
    I have this scenario and everything it's working OK, but I want to configure my Shorewall and I can't do it. My interfaces are: br0 (bridge of eth0) tun0 (OpenVPN) vnet* (each one of bridged interfaces with public IP's) Public Main IP: 188.165.X.Y OpenVPN IP's: 172.28.0.x Bridge: public ip's So, I have the next configuration for shorewall: /etc/shorewall/zones #ZONE TYPE OPTIONS IN OUT # OPTIONS OPTIONS fw firewall inet ipv4 road ipv4 /etc/shorewall/interfaces #ZONE INTERFACE BROADCAST OPTIONS inet br0 detect routeback road tun+ detect routeback /etc/shorewall/policy #SOURCE DEST POLICY LOG LIMIT: CONNLIMIT: # LEVEL BURST MASK $FW all ACCEPT inet $FW DROP info road all DROP inet road DROP /etc/shorewall/tunnels #TYPE ZONE GATEWAY GATEWAY # ZONE openvpnserver:1194 inet 0.0.0.0/0 The problem is that even with shorewall running I am able to ping or connect to the virtual machines behind the bridge

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