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• Are there any command line utilities which can calculate and/or limit how fast a pipe is running?

  - by stsquad

  I'm doing some basic stress testing of a Linux kernel network IWF with netcat. The set-up is fairly simple. On the target side: nc -l -p 10000 > /dev/null And on my desktop I was running: cat /dev/urandom | nc 192.168.0.20 10000 I'm using urandom for some poor-mans fuzz testing. However I find that even at this rate I can break something quite quickly. EDIT So I've been playing with trickle to rate limit how fast I'm generating data: cat /dev/urandom | trickle -u 10 nc 192.168.0.20 10000 But it's hard to tell if this is working. What would be really useful is a the pv equivilent of trickle that can work with pipes.

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• Detecting damage done by virus

  - by user38471

  This morning after I went to college, a virus infected my PC without any user interaction at my end. When I came home my computer was completely frozen and infected with lots of trojans. I have not typed anything important since returning so keys cannot be logged. However I want to know exactly when my computer crashed from the time of infection to see what could potentially be done remotely by a hacker. The virus my pc was diagnosed with was "fakespypro" on a fully updated Windows 7 installation with firewall enabled. My computer was connected to an internal dorm room network, so probably that has had to do something with it. Any further information about how I could backtrace this virus infection or ways to discover what data might be stolen would be greatly appreciated.

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• why this routing configuration does not work?

  - by avs099

  I have 2 VMs in HyperV role: first is RRAS - it has 2 interfaces (both manually configured, no DHCP): 192.168.1.110 - "external" one, connected to the router 192.168.10.2 - that's internal interface which other VMs will be using as well also I added VPN connection to our main server - and it gets 192.168.2.136 IP address in 192.168.2.XXX network. And IP route is create on the server as well for this interface. second VM is called KITCHENER. It only has 1 interface 192.168.10.99 / 255.255.255.0, with default gateway set to RRAS server - 192.168.10.2 QUESTION: how can I ping "main server" - 192.168.2.1 - from the KITCHENER server when RRAS server is connected to VPN? please see screenshots with ipconfig /all, route print and ping 192.168.2.1 commands. What needs to be done to get this working? all servers are Windows 2008 R2 if that matters.

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• Ubuntu 12.04 desktop, VNC viewer not refreshing screen

  - by user73279

  I've had this issues across multiple machines and multiple versions of Ubuntu desktop (all 10.04 or later). Usually it happens with an old laptop I've put Ubuntu on but now it's happening on my primary dev machine (a quad-core PC recently upgraded to Ubuntu 12.04 desktop). The problem is this - I can connect to the machine and login with the password, the initial screen looks fine but never refreshes. I can see the monitor for the machine across the room and can see the mouse move and the menus pop up but the image of the screen on the PC in front me running the VNC viewer never updates. So the mouse and keyboard commands are working. Ubuntu 12.04 Desktop Ultra VNC Viewer (also seen with RealVNC's free VNC viewer) Desktop Sharing Static IP on eth0; Dynamic ID on eth1 I think it is an Ubuntu config issue because this PC used to work just fine with 9.04, 10.04, and 11.10 (over the past couple of years). I've also had a couple of laptops that used to have this issue with older Ubuntu's but don't with 12.04. Additional info: The Win7 PC I'm trying to use to control the Ubuntu PC is connected via 2 DLink 8-port gigabit routers. The Ubuntu laptop I usually control via VNC is typically only connected to the network via wireless. The screen refresh is choppy but usable. I've repeated the issue on a Win7 laptop which was connected via ethernet and wireless.

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• set up re-direct for lan clients to local t&c page

  - by tb2571989

  Hi, I'm trying to set up something on my network so that when users connect and try and use the internet they are re-directed to a locally-hosted terms and conditions and policy page. Once they click "accept" then they will be passed through to their homepage, otherwise if they decline then the window will close or show them an error message. I've spent a while looking into this and am wondering if it's possible to do witout having to setup/add to a firewall. Otheriwse let me know what my options are and I can pass it on. Many Thanks Tom

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• deploying AV via GPO only to workstations

  - by jeremy

  We have a small (100 machines) Windows domain running Server 2008R2. We use Symantec Endpoint Protection 12.1 I want to have GPO deploy the AV software to client machines automatically, but only to client workstations, not to servers, which run a different software. I've set it up before using a GPO linked to the domain mycompany.local and it works, but it deploys the AV software to ALL machines on the domain, including my servers. I can create an OU in active directory for Servers, and perhaps create one for client machines too, but I'd rather not have to go and move new domain members from the default under Computers into a different folder. How can I use GPO to deploy this AV software only to workstations on our network, and not to servers?

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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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• What hardware factors may be considered bottlenecks on a Hyper-V virtual server during load testing?

  - by sean

  Our organization is load testing our application using virtual servers via Hyper-V to see what the user load can be using fair equipment on a single box setup. The developer group questioned the validity of the tests given the normal use of the box by the other virtual machines. IT admins answered that it is an acceptable platform to load test on because it has its own CPUs, memory and disks allocated. Is their answer mostly correct? What hardware factors may be considered bottle necks given the other virtual machines when testing our application? For example, would bus speed be a concern or network IO? The application consists of a windows service written using the 4.0 .NET Framework and SQL Server 2008 R2.

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• Limit number of simultaneous connections squid makes to a single server

  - by Ben Voigt

  Note: I am asking about outbound concurrent connection limits, not inbound, which is sufficiently covered on existing questions Modern browsers typically open a large number of simultaneous connections, to take advantage of the fact that TCP fairly shares bandwidth between connections. Of course, this doesn't result in fair sharing between users, so some servers have started penalizing hosts which open too many connections. This limit can be configured client-side (e.g. IE MaxConnectionsPerServer, Firefox network.http.max-connections-per-server), but the method differs for each browser and version, and many users aren't competent to adjust it themselves. So we turn to a squid transparent HTTP proxy for central management of HTTP download. How can the number of simultaneous connections from squid to a remote webserver be limited, so the webserver doesn't perceive it as abuse of concurrent connections? Ideally the limit would be per source address. Squid should accept virtually unlimited concurrent requests from the client browser, and issue them sequentially to the remote server, only N at a time, delaying (but not dropping) the others.

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• Blocking IP address with port forwarding

  - by Jeff Storey

  I have a website setup behind a router, so the router has the external facing address and it will forward requests to the webserver inside the network. If there are X number of invalid login attempts, that IP address will be blocked from logging in. The problem is that because the site is being accessed through port forwarding, all requests show up as though they are coming from the router address, and thus the router address becomes the blocked IP. I'm not sure if this is a limitation of the router (linksys wrt160n) or if this a more general issue. Is there a way to handle this?

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• How can I keep gnu screen from becoming unresponsive after losing my SSH connection?

  - by Mikey

  I use a VPN tunnel to connect to my work network and then SSH to connect to my work PC running cygwin. Once logged in I can attach to a screen session and everything works great. Now, after a while, I walk away from my computer and sooner or later, the VPN tunnel times out. The SSH connection on each end eventually times out and then I eventually come back to my computer to do some work. Theoretically, this should be a simple matter of just restarting the VPN, reconnecting via SSH, and then running "screen -r -d". However apparently when the sshd daemon times out on the cygwin PC, it leaves the screen session in some kind of hung state. I can reproduce a similar hung state by clicking the close box on a cygwin bash shell window while it's running a screen session. Is there any way to get the screen session to recover once this has happened, so that I don't lose anything?

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• Connecting switch to switch to router

  - by elated

  Hello, Not sure if this is the right place to ask this question. But I have a router which connects to the internet. Now I have a switch connected to this router. I added a lot more computers so I added another switch and connected it to the first switch using a cross-over cable. As soon as I connect it to the first switch, my lights in first switch start blinking like crazy and my entire network simply stops working. The minute I remove the second switch's wire, its all fine again. What could be the problem?

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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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• tradeoffs of iSCSI vs. AFP when using Time Machine with a NAS?

  - by ajit.george

  I'm setting up a home NAS device (Synology DS409) that I'm planning to use for Time Machine backups (amongst other things). What are the tradeoffs between using iSCSI or AFP to mount the backup volume? The Synology wiki suggests that iSCSI is better if the Mac will be frequently disconnected from the network or sleeping, from the point of view of the volume automatically remounting. What about filesystem consistency? Given that unplugging a USB drive without properly unmounting it often requires the Time Machine volume to be repaired, would iSCSI have the same issues? Thanks in advance.

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• Virtualizing Firewalls/UTM

  - by TheD

  So Sophos UTM (Astaro Gateway UTM) can be virtualized in Hyper-V, VMWare, vSphere etc. Now I'm new to virtualization, so am wondering how the networking would be configured in this situation. Imagine the following (a very simple setup). A Zyxel router acting as the default gateway, standard ADSL line. This is connected directly via Ethernet to my VHost, Hyper-V in my case. Now I assume I need two virtual network adapters, one which is the "External" interface to the firewall, and the other being the "Internal" interface. But where does my switch go, since I have 5 machines (or X number of machines). Where is the switch connected, to the internal interface on the VHost? What default gateway do my clients use etc? How would the routing work if these two interfaces weren't bridged since they are virtual networks anyway. I'm a little confused! Any advice is much appreciated! Cheers

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• Is 192.168.122.1 a valid IP?

  - by Louise Hoffman

  From my understanding the networks is as follows Class A: 10.0.0.1 - 10.255.255.254 Class B: 172.16.0.1 - 172.16.255.254 Class C: 192.168.0.1 - 192.168.0.254 But then I look at ifconfig virbr0 on my Linux computer: virbr0 Link encap:Ethernet HWaddr 42:40:99:CB:02:7F inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:16 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:2842 (2.7 KiB) Here the IP address is 192.168.122.1. Is that an allowed IP? And if so, is 192.168 than actually a Class B network?

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• What Should I Do? [closed]

  - by Laxmidi

  What is a reasonable goal in terms of traffic for my Flex 3 site: www.brainpinata.com Since I began a couple of months ago, I've gotten roughly 5500 ad views and 280 ad clicks. And the ad revenue is a whopping $4.80. (I don't use Google Adsense). I advertise my site using Google Adwords to try to build traffic. My budget is $10/day. What should I do? a) Push the marketing. Add a blog. Try to get backlinks, contact blogs, start a Facebook page, tweet, etc. b) Google is only indexing the static content in the SWF. The questions/answers are pulled from a mySQL database. So, Google doesn't index 99% of the content. Should I re-do the site in HTML/Javascript and hard-code the questions for each puzzle? (This would be a challenge as I don't know javascript worth squat.) Or should I hard-code the questions in XML and put them in the Flex app? If I put the questions in an XML file it's roughly 500 KB. Other ideas? c) Should I switch ad networks? (I currently get about 100 visitors a day). My ad network pays so little that if I were to make even $500/month, I would need 550,000 ad views/month, which seems impossible. If I go ahead and switch ad networks, I need to find one that allows iFrames as I've got a Flex website. Which ad networks permit their ads to be shown in iFrames? d) Should I cut and run? I put a lot of work into this project and it would really stink to get nothing out of it. I'm looking for some good advice. Looking forward to your suggestions. Thank you. -Laxmidi

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• NFS Issues in Gnome

  - by Alex

  I mount NFSv4 export via /etc/fstab and mount and use the shared folder in nautilus. There are two issues: When I copy a large file (around 4 GB) to the NFS server, the progress bar rapidly goes to 2 GB and then basically stops moving. But the copy s still in progress - it is just not displayed well When I disconnect from the network without unmounting the nfs share, nautilus freezes. How can I work around that? /etc/export on the server /export/share 192.168.0.0/24(rw,sync,insecure,no_subtree_check,anonuid=1000,anongid=1000) /etc/fstab on the client: server:/share /mnt nfs4 soft,tcp

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• EC2 server in VPC stops responding after joining domain

  - by Geoff

  We have a EC2 Windows Server set up and running in our VPC, connected to our network via a Juniper 5GT. This is working well, with the tunnel up and stable. If I then join the server to our local domain, it appears to work - I can then log on using domain credentials, and use domain accounts when applying security to folders etc. After I log out, if I give it around an hour, the box becomes unresponsive. I can't ping it, although a tracert goes all the way barring the last hop - so the tunnel is ok. I can't RDP into it. If I reboot it, then it works for a while before doing the same thing. Un-joining it from the domain fixes the problem, and it stays up and stable. The event logs don't show anything obvious, at least to me. Any ideas?

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• How to query a DHCP server to get the local DNS servers

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a) reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b) calling their tech support (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• How can I figure out exactly which process is keeping my Mac from going to sleep and waking it up?

  - by pattern86

  I have read this knowledgebase article, but would like to know if there's a way to tell exactly which process is causing my Mac not to follow the sleep schedule I have set in System Preferences Energy Saver. I have narrowed it down to a being a process and will explain why I think so (see below). I am running OS X (10.6.5) on the new iMac 27" and I am certain it's not the following: The "Wake for Network Access" checkbox in Energy Saver settings (has never been a previous issue) Peripherals (has never been a previous issue) Any active GUI application (all are closed) Additional USB/FireWire drives (none are connected) Bluetooth (it's off) Sharing services (has never been a previous issue) The symptoms are as follows: The computer doesn't go to sleep at the predetermined time. It will wake up some number of hours after being put manually to sleep (but not within the first few seconds/minutes.) Is there a specific string I should be looking for in Console? I have tried searching for "wake" and "sleep" but can't make total sense of the results.

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• Bound external Cisco CIGESM ports to a specific BladeServer

  - by Vinícius Ferrão

  We have an IBM BladeCenter with 14 blade servers and one external Cisco CIGESM for Ethernet connectivity. Since this hardware is a little old, we will use it for other services, and we want to run a pfSense instance on one of the blades. It's just an Firewall Appliance, but it needs two network interfaces: one for the WAN and the other one for LAN access. Our architecture works on top of static routes, we don't use NAT, so we got the WAN IP in one interface routing to the another one. The main problem is how to plug the WAN cable in one of the four external ports and make it exclusive to the blade server containing the firewall. And we also need an exit port that goes through a 3COM 4200G switch that makes the internal routing and VLAN separation. Thanks in advance

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• Is the Alternate Ubuntu installer still required for LVM or Software RAID setup?

  - by jimp

  Over the past 5 years, I have been setting up Ubuntu servers using the Alternate installer. I need to provision a new server today, and I'm curious if the Alternate CD is still the only way to setup LVM/RAID at installation time. I'm my limited experience with Red Hat Enterprise Linux, I noticed it's single installer configures LVM automatically. Has Ubuntu's installer, at least the standard "Server" installer, added support for LVM/RAID, or is the Alternate installer still required for that kind of server setup? http://mirror.anl.gov/pub/ubuntu-iso/DVDs/ubuntu/12.04.1/release/ Alternate install CD The alternate install CD allows you to perform certain specialist installations of Ubuntu. It provides for the following situations: setting up automated deployments; upgrading from older installations without network access; LVM and/or RAID partitioning; installs on systems with less than about 384MiB of RAM (although note that low-memory systems may not be able to run a full desktop environment reasonably). LVM has always been fundamental for our server needs, so I'm surprised if it is still not considered a server-worthy feature.

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• how to workaround glassfish 3.0.1 admin page slow startup?

  - by black sensei

  I've installed netbeans which comes with glassfish. i just got a book about glassfish and i wanted to try.the first surprise is the time it took to the admin page to load. i've found on serverfault and by googling that the server is making call to external resource on the network on online (not sure about that). but the adding of the java options didn't speed up the loading of the admin page. how to work around it? i've heard so good about glassfish that this leaves me perplexed. thanks for reading and for helping.

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• Cisco 1841 Box and Watchguard XTM21-W

  - by Corey

  I have never set one of these up before and need a little assistance. Right now we have a T1 line coming in from Sprint to a Cisco 1841 and then on to our router. However, when I plug the Cisco 1841 into Port 0 and the router into Port 3 it does not work. In Port 1 I have my management computer plugged in. We have one subnet and this must be easy but I cannot figure out how to make this work. When the firewall is plugged in then I get no internet or network access.

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