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• One NIC going to sleep on Centos system

  - by sbleon

  I have two Dell boxes with two ethernet ports a piece. I have a cable directly connecting two of these ports, creating a tiny LAN with 10.3.3.x addresses. The other port on each box is hooked up to a switch and has a DHCP-supplied address to talk to the outside world. I've noticed that when scp'ing large files from one box to the other over the private LAN, the transfers sometimes stall. It appears that any other network activity on either box will cause the transfer to resume. Wake-on-LAN is disabled on all interfaces according to ethtool. What else could be causing these stalled transfers?

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• I installed DKIM and SPF. Do I need to install Domain Keys as well?

  - by johnlai2004

  I have linux apache mysql and php server. My website uses the php mail() function and the server's postfix server to email other people. I successfully installed SPF and DKIM on my server to reduce the likelihood of my website's email-outs from ending up in people's spam boxes. In my research, I stumbled on Domain Keys which seems to be a "historical" version of DKIM. Do the big web mail services like Google, Yahoo and Hotmail still use Domain Keys? If not, then maybe I don't need to install it?

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• How to use public-key ssh authentication

  - by Poma

  I have 2 ubuntu 12.04 (beta) servers (node1 and node2) and want to establish passwordless root access between them. Other users should not have access to other boxes. Also note that ssh default port is changed to 220. Here's what I did: sudo -i cd /root/.ssh ssh-keygen -t rsa # with default name and empty password cat id_rsa.pub > authorized_keys then copied id_rsa & id_rsa.pub to node2 and added id_rsa.pub to authorized_keys. Both hosts have the same /root/.ssh/config file: Host node1 Hostname 1.2.3.4 Port 220 IdentityFile /root/.ssh/id_rsa Host node2 Hostname 5.6.7.8 Port 220 IdentityFile /root/.ssh/id_rsa Now the problem is that when I type ssh node2 it asks me for password. What may be the problem?

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• Linux + IPTables + NAT = some http hosts unreachable.

  - by Daniel

  Hi. I've set up dead simple NAT: iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o ppp0 -j MASQUERADE Everything works almost ok. Almost. The problem I've expirienced is some hosts are not reachable by NAT clients, i.e. there's http://code.jquery.com/jquery-1.4.2.min.js - I can download it from server, but in case of NAT client download stalls on connection stage. I thought its FFs fault, but wget has the same issue. I didn't find any logs/messages that can shed some light on this situtation. Any ideas what's going on? Maybe some tricky thing in sysclt is causing this? P.S. 3/3 client boxes are expiriencing this issue. This is definitely server trouble.

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• isolate web servers on intranet with dfl-800

  - by microchasm

  I administer a small network (10 users). I'm getting ready to deploy a internal webapp that will be hosted and accessed locally only. There are about 10 users on the network (192.168.111.0/24), a win2k3 server, apache (RHEL), and Mysql (RHEL), and various miscellaneous peripheries. I'd like to isolate the apache and sql boxes into a seperate area of the lan to keep things easier to maintain/grow. I've been reading about vlans, subnets, etc.. I'm not clear, however, which would be the best solution for our setup. Thanks for any tips and or advice.

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• No Office XP Updates since installed Compatibility Pack from WSUS

  - by braindump

  Hey folks, we got a bunch of boxes, running Windows XP and Office XP. Since we installed the Office 2007 Compatibility Pack, Office XP does not get updates anymore. Our WSUS provides Office 2007 patches for these computers but no Office XP, e.g. the urgantly needed Serice Pack 3. We allready tried to remove the Compatibility Pack and Office XP, reinstalled Office but there was no change. Do you have any hints? PS: The Office XP has been installed from a compressed ISO, so no administrative installation point.

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• Why do some web servers not respond to icmp requests?

  - by John Himmelman

  What is the purpose of blocking/dropping inbound ICMP traffic on a public web server? Is it common for it be blocked? I had to test if a server was accessible from various locations (tested on various servers located in different states/countries). I'd rely on ping as a quick & reliable method of determining if a server was online/network-accessible. After not receiving a response on a couple boxes, I tried using lynx to load the site, and it worked.

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• How to put a rgb image on gnuplot 3d plot?

  - by Stefano Borini

  I want to plot an rgb image with gnuplot, and it must be hovering inside a 3d plot box, so that it can act as a "floor" for my data. How can I do it ? THe gnuplot examples use a heatmap to map the rgb values, but this is not what I want. Apart from receiving an error GNUPLOT (plot_image): Color boxes cannot handle RGB components. It is not what I want in any case. I need the full rgb data in the box, not mapped through a heatmap.

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• How can I set up a rule in outlook for an alias account?

  - by lucy

  I have 4 email aliases that all deliver to the same outlook inbox. 2 of them are stop@ addresses to be included in a mailing unubscribe link. Using the simple rules in outlook doesnt work, unless we set them to move emails titled stop, but for ease of unsubscribing, we do not want responders to have to do anything other than send a blank email to the stop@ address. Our IT guy tried to sort this out, by setting up a rule that all emails sent to stop@ got into a specified folder (stop folder created within inbox), but now, all that happens is all my emails go into the wrong boxes!!! Any help would be appreciated

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• pfSense - DHCP Relay

  - by Patrick

  I have 3 pfSense boxes acting as routers on a single subnet (172.22.12.0/26). Router A - 172.22.12.1 Router B - 172.22.12.17 Router C - 172.22.12.33 I want Router A to be the only DHCP server. Router C has DHCP relay enabled that points to Router B. Router B then has DHCP relay enabled that points to Router A. Like this: Router C -- Router B -- Router A (DHCP Server) Router B gets an IP from Router A, but Router C does not. Any ideas why this configuration isn't working? Thanks.

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• Using 64 bit wuauclt from 32 bit command prompt

  - by Tim Brigham

  I have a script that for legacy reasons needs to run inside a 32 bit command shell. This script also includes references to certain core windows binaries - most notably wuauclt but others as well - which are not accessible by default within the 32 bit environment. This script is being run in several locations including many windows 7 and server 2008 r2 boxes. I'm aware of the possibility to copy files from the system32 to syswow64 in order to get around this. Is there any better method - something along the lines of adding an entry to the path variable - which will allow me to fall back to these 64 bit binaries from within a 32 bit script?

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• Can remote LogMeIn Hamachi users access our local LAN?

  - by Kev

  Unknown to me, one of the kids has installed LogMeIn Hamachi on his PC so that he can access and play on his pal's Minecraft server, and vice versa. One of the things I did was disable the Client for Microsoft Networks and File and Printer Sharing for Microsoft Networks on the Hamachi NIC in Windows 7's Network Connections. However, my lack of fu when it comes to these types of services is leaving me feeling a little uncomfortable about him using this. Is there anything I should be worried about here? For example, can his friends access our local LAN (which has a number of NAS boxes with unsecured shares) and get up to no good?

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• Security and encryption with OpenVPN

  - by Chris Tenet

  The UK government is trying to implement man-in-the-middle attack systems in order to capture header data in all packets. They are also equipping the "black boxes" they will use with technology to see encrypted data (see the Communications Data Bill). I use a VPN to increase my privacy. It uses OpenVPN, which in turn uses the OpenSSL libraries for encrypting data. Will the government be able to see all the data going through the VPN connection? Note: the VPN server is located in Sweden, if that makes a difference.

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• Windows diagnostic tools

  - by Tathagata

  I just joined a small computer lab which basically uses all Windows boxes and a few Windows Sever 2003. Coming from a *nix background I am missing all the nice tools that we have for diagnosis and troubleshooting. My question is what are the safe, free (not terribly concerned if it is like beer or freedom -both acceptable) tools out there that Windows system admins use for their day to day troubleshooting (network, applications, servers etc). I am aware of the tools that come with Windows (and their limited capabilites) - so my query is with what do you fill in your arsenal? (may be a list of win versions of tools that come in standard linux distros)

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• DDRescue on Windows or another options like DDRescue for Windows

  - by Frank Thornton

  I have a drive with failed sectors ect... I can't image it with Acronis as it hangs. I can't with Knoppiz it hangs. CHKDSK hangs. I want to use DDRescure but I don't have any Linux boxes running at the moment. I could do is in a VM but that seems like it would be slow and problematic? Are there any ways I can data recovery this disk from my Windows machine or is there an ideal way to work with DDRescue on Windows?

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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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• Outlook 2007 meeting request varying times across users

  - by gtaylor85

  I've googled this quite a bit, but none of the answers seem to apply to me. User A creates a meeting and invites everyone to a meeting at 1:30pm. Everyone gets the meeting for 1:30pm except User B who gets it for 2:30pm. User B responds with a "Correction" for 1:30pm and it shows up to User A for 12:30pm. I've checked Time Zone settings both in Windows Time and Date settings and also in Outlook options for both computers involved. Also, the DST check boxes are all checked (4x). I'm not sure what else to check. Any ideas?

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• How to reliably synchronise file servers between London and Shanghai?

  - by Andy S

  We have two offices, one in London and one in Shanghai, each needing to be able to access the same set of files. This means we need a solid, speedy means of synchronising a set of folders between servers at either office. They're likely to be Windows servers, but we could look at Linux boxes if the software side makes more sense on *nix. We've considered Rsync, Unison, Gluster, and a few other options, but none of them seem capable of reliably keeping the servers in sync between such distant office locations. Each office is on DSL connectivity over the open internet, so encryption is also a factor. Does anyone have any hints for getting the servers synchronising in as close to real time as possible, without dying constantly? Andy

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• Remote Control Home PC from Corporate Work PC

  - by muncherelli

  Here is my situation: I am currently on a Windows XP workstation at work. I have an android tablet that I use to splashtop into my home PC. I would like to be able to use my work keyboard and mouse to control my home PC while I am splashtop'd into it using my tablet. My work PC is on a corporate LAN, and not on the same network as my tablet. The company I work for provides wifi for personal devices, but they are not accessable to the internal network. I thought about going the Synergy route, however that would require my home PC to be able to connect to my work PC which isn't really possible. The opposite would work though, if I could reverse connect the server to the client, but the Synergy software doesn't really support that. I do have a couple linux boxes running at home, so I can ssh into my home network and tunnel ports via SSH if needed. With what I have, how can I accomplish seamless keyboard and mouse sharing between my work PC and either my home PC or my android tablet?

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• How to synchronize users, passwords, hosts, etc without NIS

  - by joshxdr

  I am administering a very small solaris 2.6 network with 4 boxes total. Is it possible to use scp or similar to replace NIS for synchronizing users, groups, hosts, etc? This network is only a small part of my job and I don't want to spend too much time on it, and I am worried the setup and maintenence of NIS will not pay off. I need it to behave like a proper multi-user system, when a user logs into any machine, the users, passwords, hosts, etc. are always the same. Is there an easy way to do this with scp? Right now I copy /etc/passwd from one box to another with scp, but sometimes I make mistakes or forget a step, and scp inside of shell scripts don't seem to works so well since they require password authentication. Any recommendations would be welcome.

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• Error while trying to configure VLAN with Open vSwitch

  - by Abhishek Chanda

  I am trying to connect a number of VMs using Open vSwitch. The VMs are on two separate physical boxes. Here is what I did: Created two tap devices on one physical host sudo ip tuntap add mode tap tap0 and same for tap1 Bring them up sudo ip link set tap0 up Add them as ports to Open vSwitch (br0 was created as a OVS bridge previously) sudo ovs-vsctl add-port br0 tap0 tag=1 Now I booted the VMs (using VirtualBox) and assigned addresses 192.168.122.11 and 192.168.122.12. Now when I try to ping one VM from another, I get the error Connect: network is unreachable. Since both VMs are connected to the switch on the same VLAN, I expect to be able to ping one from another. What is going wrong here?

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• Why doesn't Spotlight find Applications on OS X Server?

  - by Clinton Blackmore

  On our Mac OS X Server 10.5.x boxes, using spotlight (ie. the magnifying glass in the top corner) does not find applications and utilities, but it does on Mac OS X client (and so, we all use the keyboard shortcut and end up frustrated -- it either gives us nothing, or, without us realizing it until later, an application from another partition.) It isn't clear to me if we've done something strange setting up our servers, but they are all like this. Any idea what caused it and how we fix it? Everything (including Applications) are set to show up in a spotlight search in System Preferences).

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• Unable to map to web folder using WebDAV client on Windows Server 2008 R2

  - by user74989

  Hello, I have a client running Windows Server 2008 R2 on several servers. One of the servers is also running SharePoint 3.0 and my client has created a web folder to map to. I can map to the web folder from all Server 2008 R2 boxes that have the WebDAV client (part of Desktop Experience feature) installed, except for the server the folder resides on. When I attempt to map to the web folder on the server which the folder resides, I am repeatedly prompted to enter my credentials. I am using the same account that I used to map the web folder on the other servers. I have also tried mapping from the command line and receive 'Access Denied' What may be causing the problem? I would think that if I can map to the drive from one server, I should be able to map the drive from the rest as long as the WebDAV client is installed, especially on the server where the folder is located. Jesse

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• Disable RAID Controller

  - by B.Mr.W.

  I have some decent HP Proliants server that come with "HP Smart Array P410i Controller" enabled, I am using these boxes to set up a Hadoop cluster and I know, RAID is for sure a no-no for Hadoop since the application itself will take care of data redundancy and extra intelligence provided by RAID won't be helpful and might turn down the performance. I tried to disable the devices at the BIOS and the box cannot even access the disk afterwards. So I am assuming the controller is sitting between disks and mother board, and we have to turn it on and configure it to "level0" or something like that. I am wondering what should I do to "disable" the RAID functionality so it will fit into the Hadoop environment.

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• linux: selective sudo access for a particular command

  - by bguiz

  Hi, Is it possible to grant a particular user sudo access for one particular command only? Thanks -- More info: We farm out lengthy optimisation runs to each other's boxes over ssh. These runs take hours, sometimes days. The shutdown command can only be run in sudo. Being conscious of my environmental footprint, I would like to give the initiator(s) of these runs sudo access to the shutdown command on my box, without sudo access for everything else - so that they may shutdown my machine when they no longer need it. I am aware that I can schedule a shutdown before I leave my box, but I am looking for a better solution.

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