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• Cannot ssh into server

  - by revolver

  I am trying to SSH into a linux machine running ubuntu, but the interactive shell stuck somewhere and I can't key in anything. I am on Mac OS X Lion. This only happens when I am trying to access via an external IP. Local LAN SSH is working perfectly. macbook:~ user$ ssh -v -v user@serverip // i skipped the rest of the log, but I can paste it here again if needed. Authenticated to serverip debug1: channel 0: new [client-session] debug2: channel 0: send open debug1: Requesting [email protected] debug1: Entering interactive session. debug2: callback start debug2: client_session2_setup: id 0 debug2: channel 0: request pty-req confirm 1 debug1: Sending environment. debug1: Sending env LC_CTYPE = UTF-8 debug2: channel 0: request env confirm 0 debug2: channel 0: request shell confirm 1 debug2: fd 3 setting TCP_NODELAY debug2: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 My terminal shell just hang after this, and I can't key in anything. I checked var/log/auth on the server and saw that the a session is being created and I had already logged in, but I don't see any responses on my client machine. I googled around and a lot of the solution had to do with the Broadcom wireless driver, but I am not even using one, so I am pretty clueless here. To give you more information, the linux machine is also running a web server, and I have no problem accessing the web server. Thanks. Any help is appreciated.

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• All computers on network get stuck waiting for some sites indefinetely

  - by zacaj

  This happens across three computers, running windows 7 and Ubuntu, firefox, opera, and chrome (all latest versions). I am connected to the internet through a Verizon wireless usb modem. When I try to open some web pages they will never finish loading (and usually never even show anything). The status bar at the bottom of the browser will display "Waiting for X" The servers it gets stuck on include: platform.twitter.com s7.addthis.com connect.facebook.net ajax.googleapis.com 2mdn.net Ive been getting away with just blocking them in AdBlock up until now, however the last two have been causing problems. There are some sites which require googleapis.com to load correctly, and some that wont ever load unless its blocked. eBay requires access to 2mdn.net to load pictures. On top of this its getting really annoying having to update AdBlock across all these computers whenever a new site pops up. I'm hoping there's some easier way to fix this? The different sites causing the freeze indicate to me that it's either a problem on my end (somehow?) or some server side software that got updated with a new bug?

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• LAN Webserver not accessible through PPTP VPN

  - by Joe

  I have this LAN Network with 10 clients and one server. The server has 4 virtual machines and a BIND DNS Server. When the router assigns an IP through the DHCP , it also gives the ip of the DNS Server, to resolve internal domains. Everything apparently works fine, the clients being able to access the server's vm's resources, but I also have to create the possibility of remote access. I installed the PPTP VPN on the server, and the vpn clients would get the same ip address range as the router's dhcp is assigning. Apparently everything is fine here also, except the fact that when we connect through the vpn , we cannot access the webserver on port 80 ( the webserver being one of the server's VM ). The iptables on the webserver has been turned off for testing purposes and the router's firewall is directing all the external traffic to the server. Can somebody suggest a solution to this? Extra details : VPN Server : PPTP Server Centos 6.3 x64 VPN Client : Windows 7 default PPTP VPN Connection The client is successfully connected to the server, everything works ( FTP/MYSQL/SSH/DNS ) , except the fact that when I try to access the webserver IP on the browser, it won't work.Pinging it works perfectly.

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• I need to build a mini computer lab with 6 PCs

  - by chiurox

  Hello everyone, This weekend I need to build a mini computer lab with 5-6 PCs. The purpose is for a small computer class that will be taking place. They're mostly going to be doing office and daily kind of stuff, so nothing high performance. However, I hope it will last at least for 2 more years. I already have some parts for 2 PCs, one is a P4 3.0 and another is Celeron 2.4GHz, both socket 478. For the other 4 PCs, I'm wondering if I should buy individual parts and put it all together or get workstations like those Dell Optiplex with P4s. To put things into perspective, I am not currently in the US. I'm in South America and prices here are ridiculously. Another really important thing is that I need to share an internet connection between a total of 8 PCs at this place. Right now I only have a crappy wireless router, should I get another one? Or go with switch hub? I'm not experienced in this matter. Thanks guys!

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• Vim autocommand on BufDelete prevents opening help window

  - by Kyle Strand

  I have the autocommand described here in my .vimrc: http://superuser.com/a/669463/199803 EDIT: Copied into body of question for convenience: function CountListedBuffers() let cnt = 0 for nr in range(1,bufnr("$")) if buflisted(nr) && ! empty(bufname(nr)) let cnt += 1 endif endfor return cnt endfunction function QuitIfLastBuffer() if CountListedBuffers() == 1 :q endif endfunction autocmd BufDelete * :call QuitIfLastBuffer() Bizarrely, though, it seems that if I have exactly one listed buffer, and I try to use the :help command, the help window fails to open (or perhaps opens and is immediately closed). If I comment out that autocommand line in my .vimrc, this behavior no longer occurs. Why is this happening, and how can I fix it? Why would :h even trigger the BufDelete event? EDIT: setting verbosity to level 12, I can see that the BufDelete event is indeed occurring. Here's the portion of the output that looks relevant to me: Executing BufAdd Auto commands for "*" autocommand call <SID>BMAdd() calling function <SNR>6_BMAdd calling function <SNR>6_BMAdd..<SNR>6_BMFilename calling function <SNR>6_BMAdd..<SNR>6_BMFilename..<SNR>6_BMMunge calling function <SNR>6_BMAdd..<SNR>6_BMFilename..<SNR>6_BMMunge..<SNR>6_BMTruncName function <SNR>6_BMAdd..<SNR>6_BMFilename..<SNR>6_BMMunge..<SNR>6_BMTruncName returning '/usr/local/share/vim/vim74/doc' continuing in function <SNR>6_BMAdd..<SNR>6_BMFilename..<SNR>6_BMMunge function <SNR>6_BMAdd..<SNR>6_BMFilename..<SNR>6_BMMunge returning 'help\.txt\ (4)\^I/usr/local/share/vim/vim74/doc' continuing in function <SNR>6_BMAdd..<SNR>6_BMFilename calling function <SNR>6_BMAdd..<SNR>6_BMFilename..<SNR>6_BMHash function <SNR>6_BMAdd..<SNR>6_BMFilename..<SNR>6_BMHash returning #340582286 continuing in function <SNR>6_BMAdd..<SNR>6_BMFilename function <SNR>6_BMAdd..<SNR>6_BMFilename returning #0 continuing in function <SNR>6_BMAdd function <SNR>6_BMAdd returning #0 continuing in BufAdd Auto commands for "*" Executing BufDelete Auto commands for "*" autocommand :call QuitIfLastBuffer()

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• Run Python script at startup using upstart

  - by MarcusMaximus

  I'm trying to create an upstart script to run a python script on startup. In theory it looks simple enough but I just can't seem to get it to work. I'm using a skeleton script I found here and altered. description "Used to start python script as a service" author "Me <[email protected]>" # Stanzas # # Stanzas control when and how a process is started and stopped # See a list of stanzas here: http://upstart.ubuntu.com/wiki/Stanzas#respawn # When to start the service start on runlevel [2345] # When to stop the service stop on runlevel [016] # Automatically restart process if crashed respawn # Essentially lets upstart know the process will detach itself to the background expect fork # Start the process script exec python /usr/local/scripts/script.py end script The test script I want it to run is currently a simple python script that runs without any issue when run from a terminal. #!/usr/bin/python2 import os, sys, time if __name__ == "__main__": for i in range (10000): message = "UpstartTest " , i , time.asctime() , " - Username: " , os.getenv("USERNAME") #print message time.sleep(60) out = open("/var/log/scripts/scriptlogfile", "a") print >> out, message out.close() The location/var/log/scripts has permissions 777 The file /usr/local/scripts/script.py has permissions 775 The upstart script /etc/init.d/pythonupstart.conf has permissions 755

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• Allied Telesis router: IP filtering for the LOCAL interface

  - by syneticon-dj

  Given an Allied Telesis router with an AlliedWare OS (2.9.1) I would like to disable access to all management services of the router except for a number of subnets (or alternatively have what is a "management VLAN" with other manufacturers' switch and router models). What I have tried so far: creating a new VLAN and an appropriate IP interface, setting the LOCAL IP into this subnet, creating an IP filter for the IP interface and specifying my exclusion subnets: it simply does not work as intended as I can access the LOCAL IP set from any of the other VLAN interfaces - the traffic is apparently not going through my defined filter set at all creating a new IP filter set and binding it to the LOCAL IP interface: this seems not to affect any kind of traffic at all, the counters for the filter set remain at zero packets setting the Remote Security Officer Level IP address range: this only restricts the ability for a user with the Security Officer privilege level to log in from any but the specified address ranges / subnets. Unfortunately, it does not prevent service availability (and thus DoS capacity) or the ability to log in as a less privileged user (e.g. a "manager") calling technical support: unfortunately no solution so far What I have not tried: creating a filter set for each and every IP interface defined on the router and excluding access to the router's management IP: I would like to reduce the overhead induced by IP filters as the router already is CPU-constrained at times. Setting up filters for every IP interface would mean that each and every traffic packet would have to pass the filters, thus consuming CPU cycles. If by any means possible, I would like to find a different solution.

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• Local Network - Windows 7 and Vista can't see each other

  - by ca8msm

  I've got a strange issue at home that has been bugging me for weeks, but I really need to get it sorted now so I'll detail as much as I can and hopefully someone can spot what might might be wrong. I have a wireless router connected to the internet and 3 devices connected to it. They are: Name OS Network IPv4 PC1 Windows 7 WORKGROUP 192.168.2.2 LAPTOP1 Vista WORKGROUP 192.168.2.3 PS3 192.168.2.4 and they all get their IP addresses dynamically. Both PC1 and LAPTOP1 can ping PS3 and get a response. PC1 and LAPTOP1 are unable to ping each other by ip address unless I ping by their name (which bizarrely shows that it is pinging via the IPv6 address). Also, to confirm this both PC1 and LAPTOP1 can ping each other via the long IPv6 address that they both have so they can obviously see each other just not via IPv4. I've disabled the firewalls on both machines as well to rule that out. I don't really know what IPv6 is used for and I've tried disabling it on both machines but all that happens then is that neither machine can see each other at all then. Does anyone have any idea of what may be stopping them seeing each other, any ways I can look at fixing this, or any network tools that may help identify where it is failing? Thanks, Mark

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• SBS 2008 - DNS Forwarders timing out.

  - by Moif Murphy

  Hello, We have an SBS 2008 server that keeps losing connection to the internet approx 2-3 times a day. It's a simple setup, BT Business Broadband ADSL to a Wireless Zyxel router to the server. Clients connect via WiFi from their laptops. Plugging ethernet in makes no difference, only a reboot of the router seems to bring everything back again. I'm looking at the forwarders on the DNS properties page and they're timing out when trying to resolve the IPs. Currently there are two IPs in there, 194.72.9.34 which has timed out and 194.72.9.38 which has finally resolved to ns8.bt.net We've been in there and replaced all media, installed a PCI NIC, have changed the router three times. There are no errors in the DNS event logs pertaining to what's going on. We've also been on to BT who are adamant that it's not their end. Could someone shed some light on what could be going on or where else to look in the configuration of the server? Thank you.

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• Power surge PC damage: How can I test all components of my PC without access to a second computer?

  - by Doug T.

  Ever since we had some crazy power surges last week my 64 bit Windows 7 PC has been acting strange. My USB network adapter disconnects from the wireless and can't detect the signal. I have to disable/reenable the adapter to detect it again. Also my wife has reported that the PC has rebooted a few times while I'm not sitting at it. Today I finally caught the reboot while I was using the PC. I got this blue screen of death. Stop Code 0x00000109: "Modification of system code or a critical data structure was detected." I followed the advice at the linked article and ran a memory test. I used memtest86 and its already found around 300,000 errors out of 8 gigs of ram. Now I'm worried -- what are the odds this is isolated to just my memory and not just a system wide problem? Isn't there a good chance that many other components are fried? More importantly, how can I test those other components? Are there tools similar to memtest I can use to test my motherboard/video card/power supply? If these are vender specific, is it typical for vendors to provide testing tools?

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• Laptop keyboard stopped functioning properly

  - by galdikas

  Basically today out of blue my laptop keyboard started acting up. For example I press "s" but I see "`s" on the screen. Some keys don't work at all. And the weird thing is it keeps changing, in a sense that for example in the morning I press "s" and I get "`s", then few hours later "s" works correctly.. but pressing some other key output multiple characters. Then sometimes it spontaneously will start outputting some character onto any input field that is available as soon as I click on it to gain focus. And it will just keep on going and going, as if I keep a button pressed (which I don't). At first I thought this was a virus, but I have a dual boot of Windows 7 and Ubuntu, and I get same problem on both. I even tried to boo live CD, and still had same problem. Anyone had this kind of problem? It's a Toshiba Satellite c660-258. It is around year old, but quite well kept. Never spilled anything on it, or dropped it. And my wireless USB keyboard works perfectly on it (appart from the spontaneous character inputs, which I can stop by hitting NUM LOCK key)

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• Oracle 11g Data Guard over a WAN

  - by Dave LeJeune

  Hi - We are in process of looking at using Oracle's Data Guard to replicate our 11g instance from a colo facility in Washington DC to Chicago. To give some basics we have approximately 25TB of storage and a healthy transaction rate in the 1-2K/sec range. Also, because we are processing data in real-time we have a 24x7x365 requirement for processing data. We don't have any respites as far as volume except for system upgrades (once every few months) where we take the system offline but then course experience a spike in transactions when we bring the system back on-line. Ideally we would want the second instance in the DG configuration semi-online in a read-only fashion for reports/etc. We evaluated DG in 10g and were not overly impressed and research seemed to show that earlier versions had issues with replication over a WAN but I have heard good things about modifications the product has gone through w/ 11g. Can anyone confirm an instance of this size and transaction rate being replicated over a WAN and if so what is the general latency? An information or experiences with a DG implementation that is of this size and scope would really be helpful (or larger - I also realize we are still relatively small compared to many others out there). Many thanks in advance.

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• How can I determine the IP addresses allocated by DHCP on a router that I'm connected to?

  - by user234831

  This "router" is not a typical situation. I'm using my phone as a hotspot and can only configure a select number of DHCP options. I can manage the limit on how many devices/clients can use my phone as a hotspot. I have to select from a radio-button list with the options: 2,3,4,5, or 8 I can specify the DHCP starting IP address. In this case, it begins at 192.168.6.106 When I'm connected via WIFI to my phone, an ipconfig /all command shows me that the default gateway is 192.168.6.1 and my IPv4 address is 192.168.1.148. I have the luxury of connecting another device to the phone and that device was assigned 192.168.1.121. I've tried connecting to 192.168.6.1, hoping for some sort of router setup page that I'm used to seeing, but there is no such thing or maybe it's just a matter of incompatable operating systems. In summary, the "router" (phone) has an IP address of 192.168.6.1 and a DHCP server that begins at 192.168.6.106 and allows up to 8 connections. Normally, I would assume a range of 192.168.6.106 - 192.168.6.113, but connected clients are showing otherwise. How can I figure out which IP addresses are set aside by DHCP for clients?

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• How to start and stop a systemd unit with another?

  - by Andy Shinn

  I am using CoreOS to schedule systemd units with fleet. I have two units (firehose.service and firehose-announce.service. I am trying to get the firehose-announce.service to start and stop along with the firehose.service. Here is the unit file for firehose-announce.service: [Unit] Description=Firehose etcd announcer BindsTo=firehose@%i.service After=firehose@%i.service Requires=firehose@%i.service [Service] EnvironmentFile=/etc/environment TimeoutStartSec=30s ExecStartPre=/bin/sh -c 'sleep 1' ExecStart=/bin/sh -c "port=$(docker inspect -f '{{range $i, $e := .NetworkSettings.Ports }}{{$p := index $e 0}}{{$p.HostPort}}{{end}}' firehose-%i); echo -n \"Adding socket $COREOS_PRIVATE_IPV4:$port/tcp to /firehose/upstream/firehose-%i\"; while netstat -lnt | grep :$port >/dev/null; do etcdctl set /firehose/upstream/firehose-%i $COREOS_PRIVATE_IPV4:$port --ttl 300 >/dev/null; sleep 200; done" RestartSec=30s Restart=on-failure [X-Fleet] X-ConditionMachineOf=firehose@%i.service I am trying to use BindsTo with the notion that start and stop of firehose.service will also start or stop firehose-announce.service. But this never happens correctly. If firehose.service is stopped, then firehose-announce.service goes to failed state. But when I start firehose.service, the firehose-announce.service doesn't start up. What am I doing wrong here?

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• what are these weird IP address connections in resource monitor?

  - by bill

  I decided to check out Resource Monitor (on the 'Performance' tab in Task Manager, Windows 7) and I noticed in the "Network" section that the 'System' image name kept making a bunch (~5 at a time) of connections to random IP addresses, it would show anywhere from 1-500 bytes/sec 'sent'. They would stay connected for 1-2 minutes. -All web browsers are closed So, first thing I did was run a trace from network-tools.com on some of these IP addresses. 8/10 were outside of US and did not resolve to any host name. Of the 10 IP addresses I traced, 2 were in US, 4 showed origins in China, and one each to Algeria, Russia, Pakistan, Korea. (!) So, the next thing I did was turn off my wireless card, watch the connections disappear, then turn the card back on, and within 30 seconds more random connections were created by System, with different IP addresses from the first time. The next thing I did was go open Task Manager, Show Processes From All Users, then I killed just about everything that wasn't (what appeared to be) a windows process. Turned on wi-fi, and again within 30 seconds, random IP addresses connect for ~ 1 min at a time, new ones coming and going. I occasionally use bit torrent on this machine, but there was definitely no process that seemed related to bt running after I went through task manager, and bt wasn't open to begin with. So, any ideas on what these connections might be for? I have been using Ad-Aware Free and AVG Free on this computer for a while now, always up to date..

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• Can I split one ethernet line coming out of my wall into multiple separate lines?

  - by Burteçin 'Turk' Sapta

  Hi all and thanks in advance. I'll start with some background. I live in an apartment which provides internet service included in the rent. They use company called pavlov for the internet http://pavlovmedia.net/ wireless seems to be working fine but wired connection is at least %30 faster. Ethernet, cat5 outlet is built in the wall, and there is only 1 outlet in each room. I would like to take this 1 outlet coming out the wall and multiply it into 4 wires, for desktop, playstation, tv and laptop without loosing any internet bandwidth. i have absolutely no idea weather this line is coming from a switch or a router but i have been researching Ethernet splitter, routers, switches, hubs and haven't found a solid answer. what is the best solution for me? thank you once again! EDIT: ok this picture cleared few things http://www.home-network-help.com/images/home-network-expanded.jpg so seems that an ethernet switch is to ethernet as a USB hub is to USB. what is really 10/100Mbps Network Switch and what is the cap?

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• Laptop + External Monitor: Possible to Scale Mouse-crossover Position?

  - by Brian Lacy

  I have a laptop with a 16" screen @ 1366x768 resolution, and a 24" external monitor at 1920x1200 resolution. I'm extending the Windows 7 desktop onto the other screen. The 24" is the secondary monitor, and is positioned so the bottom of that screen lines up with the bottom of the 16" screen. Currently, if I move the mouse to the top portion of the 24" screen, then move left, the mouse will stop at the edge of the 24" screen until I move it down far enough to get into the range of the 16" screen. So that's all pretty standard; but I'm wondering if there's any software out there that will allow me to "scale" the mouse-crossover position, such that if I'm at the TOP of the 24" screen and move left, the mouse will cross to the TOP of the 16" screen, whereas if I'm at the BOTTOM of the 24" screen, crossing over will position the mouse at the BOTTOM of the 16" screen. So then, if the mouse cursor is on the 24" screen at (x,y) position (10,600), and I move 20 pixels left, the mouse is now on the 16" screen at position (1356,384). Anyone know of such a solution?? Note: I also use Ubuntu, so if there's a solution to this for X, but not Windows, I'd be interested in that also.

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• Selecting whole column except first X (header) cells in Excel

  - by Robert Koritnik

  I know I can select all cells in a particular column by clicking on column header descriptor (ie. A or AB). But is it possible to then exclude a few cells out of it, like my data table headings? Example I would like to select data cells of a particular column to set Data Validation (that would eventually display a drop down of list values defined in a named range). But I don't want my data header cells to be included in this selection (so they won't have these drop downs displayed nor will they be validated). What if I later decide to change validation settings of these cells? How can I selection my column then? A sidenote I know I can set data validation on the whole column and then select only those cells that I want to exclude and clear their data validation. What I would like to know is is ti possible to do the correct selection in the first step to avoid this second one. I tried clicking on the column descriptor to select the whole column and then CTRL-click those cells I don't want to include in my selection, but it didn't work as expected.

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• Log Problem and bash script

  - by GvWorker

  Hello Guys, I have 11 Debian servers running on rackspace cloud hosting. All running VHCS2 for hosting management. 1 server is used for application and 10 are used for only smtp. My question is regarding smtp servers. Each server hosted 1 domain. My problem is when my client use smtp there's a log created in this directory /var/log/ but within 24 hours drives are full and server refuse all smtp connections. Then I deleted the logs and ran following command to check the disk space. df -h but it shows hdd still full and server is still refusing the smtp connections. Then I ran following command to see the truth du --max-depth=1 -h It shows the truth. The real disk space used. Then I rebooted the server and now server working fine. But after few hours same situation happened. Then I created the following script. #!/bin/sh rm -fr /var/log/* rm -fr /var/log/apache2/*.log rm -fr /var/log/apache2/*.log.* rm -fr /var/log/apache2/users/* rm -fr /var/log/apache2/backup/* reboot It worked for days but after that logs are again filling the hdd. Now I want the following solutions. If anybody can help me. When I delete files from server hdd will free up without rebooting Log should be in specific range. Like a specific size of file where old data overwrite with new data

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• Router(s) Issue: DNS quries sporadically fail with multiple computers hooked in

  - by bob-the-destroyer

  Basically, after anywhere from 5-60 minutes, DNS queries fail for a few minutes, then slowly begin to resolve correctly. Then the cycle repeats. This occurs only when more than one computer is on the network. All computers on the network experiences the same sporadic DNS outage at the same time. Wireless or wired, Linux or Windows, fresh OS install or old, browser or ping, same symptoms. Duplicated on 3 routers (not chained together, mind you) and 3 ISP's and 3 separate locations over the past several months. The only common theme is a single 5-yo WIN XP laptop which has been in use on the network throughout all this. There also may be anywhere between 1 - 10 devices hooked up wired or wirelessly at a time. The only reprieve I have from this torture is by using any VPN to an outside source - always smooth sailing. I typically set up any router to a) use WPA2/etc security; b) MAC whitelist; c) UPNP OFF (if available); d) always update firmware when available; e) obtain DNS from ISP automatically; f) set the router to act as DHCP server for the internal network. Adjusting channels has no effect. Any ideas?

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• How to use non-free drivers during debian install

  - by blokeley

  I'm trying to install debian stable using unetbootin. The install process fails with "network autoconfiguration failed", probably due to the ethernet driver not working. My Lenovo U350 has a Broadcom BCM57780 which does not seem to be supported out-of-the-box: there are various bug reports here, here and here, but I don't know if the fix has made it into debian (6) stable. One discussion says that you have to use an ethernet driver from the firmware-linux-nonfree package. I'm not sure that this is correct because the BCM57780 is not in the list of drivers in firmware-linux-nonfree. The specific question tree is: Is BCM57780 supported in debian stable? If so, what could be wrong? Should I install debian unstable instead? If not, do I need to use firmware-linux-nonfree during installation and, if so, how do I do this? Please note: I've used ubuntu and debian loads in the past but please post line-by-line guidance rather than some cryptic abbreviation of any instructions. Thanks in advance for any help. Updates: Debian stable with non-free drivers did not work. Debian unstable (free drivers only) did not work. Tried loading firmware-iwlwifi_0.28_all.deb from another USB stick to get wireless working rather than BCM57780. The .deb file was found but the network configuration still failed! That's it, I'm giving up. Unfortunately I'll use ubuntu even though the Unity user interface will be very unstable for the next couple of years :(

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• Locate devices within a building

  - by ams0

  The situation: Our company is spread between two floors in a building. Every employee has a laptop (macbook Air or MacbookPro) and an iPhone. We have static DHCP mappings and DNS resolution so every mobile gets a name like employeeiphone.example.com, every macbook air gets a employeelaptop.example.com and every macbook pro gets a employeelaptop.example.com on the Ethernet interface (the wifi gets a dynamic IP from a small range dedicated for the purpose). We know each and every MAC address of phones and laptops, since we do DHCP static mapping (ISC DHCP server runs on linux). At each floor we have a Netgear stack of two switches, connected via 10GB fiber to each other. No VLANs so far. At every floor there are 4 Airport Extreme making a single SSID network with WPA2 authentication. The request: Our CTO wants to know who is present at which floor. My solution (so far): Every switch contains an table listing MAC address and originating port. On each switch stack, all the MAC addresses coming from the other floor are listed as coming on port 48 (the fiber link). So I came up with: 1) Get the table from each switch via SNMP 2) Filter out the ones associated with port 48 3) Grep dhcpd.conf, removing all entries not *laptop and not *iphone 4) Match the two lists for each switch, output in JSON or XML 5) present the results on a dashboard for all to see I wrote it in bash with a lot of awk and sed, it kinda works but I always have for some reason stale entries in the switch lookup tables, making it unreliable; some people may have put their laptop to sleep, their iphones drop connections after a while, if not woken up and so on..I searched left and right, we are prepared to spend a little on the project too (RFIDs?), does anybody do something similar? I can provide with the script if needed (although it's really specific to our switches and naming scheme). Thanks! p.s. perhaps is this a question for stackoverflow? please move if it so.

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• Server load increases by lot of httpd request with same PID

  - by user3740955

  I can see that my server load increases to more than 200-300 range. Before 1 week the maximum load was around 20-25. In top and ps -ef i can see a lot of httpd threads and the PPID of most of the httpd request are of the same PID. When i verified this the parent process ID is of root. Please let me know how i can reduce the server load. I have searched a lot for this but not able to find out a proper solution for this. Please let me know. Please see below a part of the top output. apache 29698 2062 1 16:54 ? 00:00:00 /usr/sbin/httpd apache 29700 2062 3 16:54 ? 00:00:00 /usr/sbin/httpd apache 29701 2062 10 16:54 ? 00:00:02 /usr/sbin/httpd apache 29702 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29703 2062 1 16:54 ? 00:00:00 /usr/sbin/httpd apache 29705 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29706 2062 3 16:54 ? 00:00:00 /usr/sbin/httpd apache 29707 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29708 2062 1 16:54 ? 00:00:00 /usr/sbin/httpd apache 29709 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29710 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29711 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd apache 29712 2062 0 16:54 ? 00:00:00 /usr/sbin/httpd Server version: Apache/2.2.3

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• ubuntu 12.04 kvm virtual server network setup, can't get the machine to be connectable

  - by xyious

  I have worked on my Ubuntu Server host for weeks now and I just can not manage to get the virtual machines into the network.... here's what I need to do: I need to be able to create virtual machines that have IP addresses that can be reached from the outside (192.168 network). I need to be able to connect to the virtual machines through ssh, ftp, http and preferably https, anything else doesn't matter that much. So far everything seems simple enough and I have a lot of leeway in terms of IP address range and server/client configuration. I have the option of taking part of a /24 net as most IPs aren't used, and if it's absolutely necessary I have the option of creating a new /24 subnet. Also have the option of reformatting and reinstalling OS on the host and recreating the virtual machines as nothing has been done other than trying to get virtual machines to work. I would prefer if the virtual machines were just part of the normal network which would be 192.168.5.0/24. The host machine has 2 network cards so I don't even necessarily need the Host to be connectable in the same /24 network. I have tried (I think) just about everything from about 5 different tutorials on bridging (giving br0 the same IP that eth0 used to have (Host is able to connect to VM and vice versa, VM doesn't have outside network access), having eth0 set up like it always was and having br0 have a different IP (same as above), NAT with port forwarding (which I would have preferred not to use but will if it works), turning off one of the hosts network cards and just using one of them, different subnets.... etc. I do know my way around iptables fairly well.... Host is 64bit Ubuntu Server 12.04, using libvirt/kvm. edits: Local network is 192.168.5.0/24, host has static ip 192.168.5.254, GW .5.1 which is also nameserver. We have a second Local network at 192.168.10.0/24 with .10.1 GW, but both hosts and VMs were supposed to go into the .5 subnet. The .10 subnet isn't required, but it wouldn't be horrible if the Host were only accessible in the .10 subnet.

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• cheap gigabit switch for small business

  - by neoice

  my friend's business is currently borrowing my Adtran 1224R and is very happy with it. it's configured with a few VLANs to segment customers, internal traffic and public wifi. port 1 is a "trunk" port to the router, a chunky Linux box with iptables+NAT. they push a lot of traffic over the LAN (data backups) and really need gigabit. besides, I'd like my Adtran back :P my goal is to find a cheap(ish) switch that can function as a drop-in replacement. it looks like VLAN trunking is actually part of the 802.1q spec, so anything with VLAN support should cover the current trunk-to-router setup. it's nice to have both a web interface and SSH, but I can configure it either way if needed. things like the Netgear GS724T have caught my eye, but it seems like none of the hardware in the $300-500 range have really solid reviews. I'm concerned that "cheaper" hardware might not work for a network full of power users. does anyone have a recommendation for the Netgear GS724T or a switch that will meet my needs?

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