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  • Alternate Out of Order TCP Packets problem

    - by Sunil
    I am having a network of windows and embedded nodes connected on a series of cisco switch. I have been seeing some serious network problems from few days. Used wireshark to capture the network trace and see every alternate tcp packets being marked as "out of order". Any pointers on how to troubleshoot this problem?

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  • Two DHCP Servers, Block Clients for one of them?

    - by Rilindo
    I am building out a kickstart network that resides on a different VLAN uses its own DHCP server. For some reason, my kickstart clients kept getting assign IPs from my primary DHCP server. The way I have it set up is that I have a primary DHCP server on this router here: 192.168.15.1 Connected to that DHCP server is a switch with the IP of 192.168.15.2. My kickstart (Scientific Linux) server is connected to that switch on two ports: Port 2 - where the kickstart server communicates to the rest of the production network via eth0. The IP assigned to the server on that interface is 192.168.15.100 (on eth0). The details are: Interface: eth0 IP: 192.168.15.100 Netmask: 255.255.255.0 Gateway: 192.168.15.1 Port 7 - has it's own VLAN ID (along with port 8). The kickstart server is connected to that port with the IP of 172.16.15.100 (on eth1). Again, the details are: Interface: eth1 IP: 172.16.15.100 Netmask: 255.255.255.0 Gateway: none The kickstart server runs its own DHCP server and assigns them over the eth1. Most of the kick starts are built over the kickstart VLAN through port 8. To prevent the kickstart DHCP server from assigning addresses over the production network, I have the route setup like so: route add -host 255.255.255.255 dev eth1 At this point, the clients kept getting assign IPs from the 192.168.15.1 DHCP server. I need to figure out a way to block client requests from reaching that DHCP. Its should be noted that but I also build KVM hosts on the kickstart server as well, so I need those KVMs to have the ability to get DHCP requests from the 192.168.15.1 DHCP server via the bridge network once I finish resolved this particular problem. (Currently, they communicate via NAT). So what would be done to resolve this? Through iptables or some sort of routing I need to put in? I tried to limited to requests via IPtables on that interface, allowing DHCP requests for 172.16.15.x network: -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 69 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 69 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 68 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 68 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p udp -m udp --dport 67 -j ACCEPT -A INPUT -i eth1 -s 172.16.15.0/24 -p tcp -m tcp --dport 67 -j ACCEPT And rejects assignments on eth1 from 192.168.15.x network: -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 69 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 69 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 68 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 68 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p udp -m udp --dport 67 -j REJECT -A FORWARD -o eth1 -s 192.168.15.0/24 -p tcp -m tcp --dport 67 -j REJECT Nope. :(

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  • How do I keep windows XP from automatically changing the screen resolution?

    - by roamn
    I have an Asus EEEBox (EB202, intel GMA 950) hooked up to my 1080p TV (DVI-HDMI cable). I use it to watch standard definition movies and TV shows. I prefer to run at 1280x720 so that I can see things more easily, but every time I turn off the TV, then back on again, the resolution defaults to 1080p (1920x1080). How can I force a specific resolution? If that's not possible, is there a way to use a batch script to switch to the desired resolution faster?

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  • Default setting for dual monitors (using Win+P)

    - by Tomek
    I have two displays (one monitor and one TV) connected to my card via DVI. I switch between them with Win+P (when I'm using XBMC I set "only projector"). Most of the time, I use it during late hours, so I just turn off the PC (with XBMC's option "shutdown") and go to sleep. All fine, but on the next day my display is changed (to "only projector"). Bottom line is - how can I set my Windows 7 to have "only monitor" each time system boots?

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  • Single space on secondary display?

    - by zoul
    Hello! Is it possible to only have one space on secondary display when using Spaces on Mac? I’d like to have three spaces on the primary display and only use the secondary one as a common “sideboard” that does not change when I switch Spaces on the primary display.

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  • Custom layout/group switching keys in Linux

    - by abyx
    I'm using Ubuntu (Karmic) and 2 keyboard layouts. Using the gnome settings, I managed to set it to switch with Alt+Shift (windows style), but I really want to limit it to Right Alt + Right Shift, but that option isn't available in the gnome wizard. I've opened gconf-editor and found the kbd configuration, but trying to add 'r' or 'right_' prefixes to the keys didn't help. Is this possible?

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  • Can I set Outlook to always Reply to All?

    - by Andrew
    This may be hidden in the options somewhere but a glance through didn't find it: Is it at all possible to set Outlook so that a click on the "Reply" button (or, as I do, hitting Ctrl-R) will always reply-to-all, rather than reply to one? Or, I suppose, a basic switch of the reply buttons so that the default is reply-to-all, and, for example, I could hit Ctrl-Shift-R instead to reply to one? It's annoying me to constantly have to hit reply-to-all when that's all I do, and I sometimes forget to do it.

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  • How to make it easier when using the vim command in unix?

    - by Mitral
    Recently i try to learn something about the unix. when i try to edit something using the vi command, it is very difficult for me since i have to switch the edit mode and control mode time by time. It is very inconvenient. Is it that i miss something or it is originally like that? Is there anyway to improve that? Thank you :)

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  • How to use dedicated video card instead of onboard?

    - by Mathias Lykkegaard Lorenzen
    Hi there! I tried running DxDiag (DirectX diagnostics), and I noticed that my graphics card is set to the onboard one that comes with the Core i5 processor (some Intel HD stuff). On my computer, I also have a dedicated graphics card (an Nvidia 310). No serious gaming stuff, I know - just for programming. However, I would still love to know how to switch to that dedicated graphics card instead. My laptop is an MSI CX720.

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  • centos install / partitioning

    - by ServerSideX
    I'm using NOC-PS to remotely install Centos 6.2 via KVM / IPMI. I'm going to install cPanel as well and they recommend this layout /boot (99MB) swap (2x server RAM) / (remainder) In the o/s install profile within NOC-PS software, it shows as this: part /boot --fstype ext2 --size 250 part pv.01 --size 1 --grow volgroup vg pv.01 logvol / --vgname=vg --size=1 --grow --fstype ext4 --fsoptions=discard,noatime --name=root logvol /tmp --vgname=vg --size=1024 --fstype ext4 --fsoptions=discard,noatime --name=tmp logvol swap --vgname=vg --recommended --name=swap By the time the default partition setup was done installing Centos, I get this [root@server005 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg-root 532G 907M 504G 1% / tmpfs 7.8G 0 7.8G 0% /dev/shm /dev/sda1 243M 28M 202M 13% /boot /dev/mapper/vg-tmp 1008M 34M 924M 4% /tmp [root@server005 ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Fri Dec 7 18:47:24 2012 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/vg-root / ext4 discard,noatime 1 1 UUID=58b31aaf-5072-4fb1-a858-33bc316fa793 /boot ext2 defaults 1 2 /dev/mapper/vg-tmp /tmp ext4 discard,noatime 1 2 /dev/mapper/vg-swap swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 My question is, how should the NOC-PS install profile look like to get the recommended cPanel partitioning? The server has 16GB RAM, dual 600GB SAS drives and will be used for cPanel shared hosting.

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  • Getting SEC to only monitor latest version of a log file?

    - by user439407
    I have been tasked with running SEC to help correlate PHP logs. The basic setup is pretty straightforward, the problem I'm having is that we want to monitor a log file whose name contains the date(php-2012-10-01.log for instance). How can I tell SEC to only monitor the latest version of the file(and of course switch to the newest log file every day at midnight) I could do something like create a latest version of the file that links to the latest version and run a cron job at midnight to update the link, but I am looking for a more elegant solution

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  • How do you run the previous command in emacs shell?

    - by Lidmith
    I am in terminal mode on Ubuntu, and I'm running emacs with 2 buffers open, one is a ruby file, and the other is a shell (opened by typing M-x shell ), and when I switch to the shell buffer, I want to run the same command that I ran before. I would normally just hit the up arrow in a terminal window, but in emacs, it simply puts the cursor up one line. Does anyone know of keystroke to run the previous shell command from within an emacs shell?

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  • My computer makes weird sounds that you can only hear through a speaker

    - by Mury
    I recently got a brand new computer. Everything was fine until I plugged my electric guitar into my amp. When I switch on my guitar amp (guitar speaker) I can hear a weird noise. It sounds like the noise that that goes through your speakers when you put your mobile phone next to it. There is nothing wrong with my guitar or guitar amp and I didn't have any similar problems with my old computer. Can anyone help me?

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  • Emacs / Wanderlust / OSX -- Any ideas what could cause Emacs to acquire focus when using Wanderlust?

    - by lawlist
    I'm using Wanderlust with Emacs on OSX 10.6.8 (Snow Leopard) and frequently switch to a different application while Wanderlust is prefetching e-mails and organizing the summary buffers. At several stages during this process, Emacs acquires focus and steels me away from whatever I was doing in another application. I don't think Wanderlust has any built-in applescripts and I haven't added any, so I have no idea what could be causing Emacs to demand focus. Any ideas how to leave Emacs in the background while updating Wanderlust?

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  • What is the overhead when redirect through mod_proxy

    - by ivoba
    I have an API that used to run on Apache but now is served via lighttpd. I can easily switch the API URL in the app to the lighty port like api.net:81. I wonder if I should use mod_proxy instead to have cleaner urls. There is no redirect for legacy urls necessary. What would be the overhead for the Apache in between compared to the direct call? Would mod_proxy and Apache steal the benefit of lightys lightweightness?

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  • How to log all sql going through JBoss datasource with log4j

    - by Ichorus
    I've looked at log4jdbc (which does not support datasources), p6spy which seems to be what I am looking for but it has not been updated since 2003 which makes me nervous and lists only JBoss 3.x (we use JBoss 5), and JAMon which seems heavyweight for what I am trying to accomplish (a simple log of all SQL statements running through a JBoss application server). I was hoping that JBoss itself would have a switch to log all the sql (as Websphere does) but I cannot find any documentation for it so that functionality might not exist.

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  • An device with an unknown MAC address is connected to my router

    - by Yar
    There is a computer that is not mine that is accessible on my network. I can even access its filesystem via AFP. What I want to know is how the computer could get on my network. My network is secured like this: Does that mean that they've used password cracking tools? The pass is not easy to guess but not hard to figure out via brute-force hacking, I guess. If I am being hacked, should I switch to WPA?

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  • How should we serve files in a small bioinformatics cluster?

    - by cespinoza
    We have a small cluster of six ubuntu servers. We run bioinformatics analyses on these clusters. Each analysis takes about 24 hours to complete, each core i7 server can handle 2 at a time, takes as input about 5GB data and outputs about 10-25GB of data. We run dozens of these a week. The software is a hodgepodge of custom perl scripts and 3rd party sequence alignment software written in C/C++. Currently, files are served from two of the compute nodes (yes, we're using compute nodes as file servers)-- each node has 5 1TB sata drives mounted separately (no raid) and is pooled via glusterfs 2.0.1. They each have as 3 bonded intel ethernet pci gigabit ethernet cards, attached to a d-link DGS-1224T switch ($300 24 port consumer-level). We are not currently using jumbo frames (not sure why, actually). The two file-serving compute nodes are then mirrored via glusterfs. Each of the four other nodes mounts the files via glusterfs. The files are all large (4gb+), and are stored as bare files (no database/etc) if that matters. As you can imagine, this is a bit of a mess that grew organically without forethought and we want to improve it now that we're running out of space. Our analyses are I/O intensive and it is a bottle neck-- we're only getting 140mB/sec between the two fileservers, maybe 50mb/sec from the clients (which only have single NICs). We have a flexible budget which I can probably get up $5k or so. How should we spend our budget? We need at least 10TB of storage fast enough to serve all nodes. How fast/big does the cpu/memory of such a file server have to be? Should we use NFS, ATA over Ethernet, iSCSI, Glusterfs, or something else? Should we buy two or more servers and create some sort of storage cluster, or is 1 server enough for such a small number of nodes? Should we invest in faster NICs (say, PCI-express cards with multiple connectors)? The switch? Should we use raid, if so, hardware or software? and which raid (5, 6, 10, etc)? Any ideas appreciated. We're biologists, not IT gurus.

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  • How to set Standby server

    - by lasko
    I have an application that connects to SQL Server 2008. What I want is to make a standby server (this standby server should be a mirror of the primary one). So that when the connection fails, the primary server should automatically switch to standby server without modifying my application. If there is way, please tell me in detail or even if there is third party product. Note that I need to set the connection in my application to one server only.

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  • windows 7 BOOTMGR is missing (no win7 CD/usb)

    - by WideBlade
    I've got an Asus Eee PC with Windows 7 starter pre-installed on it. Now, I don't have anything attached to it, no CD/USB Stick/Cables. However, I still get this error: BOOTMGR is missing Press Ctrl+Alt+Del to restart Since I do not have the USB stick with the windows 7 starter OS and don't want to switch this computer to ubuntu as it is not for me, I can't follow the instructions in this tutorial. Please help!

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  • grabbing/parsing iSCSI iface information

    - by chrisg
    I'm writing a puppet provider for iSCSI and want to grab information about the ifaces (in my case HBAs) we have, is there a better way than doing this: iscsiadm -m iface -I be2iscsi.00:00:00:00:00:00|grep iface.ipaddress|sed -e 's/iface.ipaddress = //' it looks pretty ugly, but the -n switch doesn't seem to work unless you're in --op=update is there a better way to grab this information, in particular in ruby?

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