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• Routing WIFI and LAN for specific traffic

  - by jakebird451

  I have two network devices aboard my macbook pro: WIFI (en1): Used for general traffic. Connects to an ip of 192.168.19.* via DHCP LAN (en0): Used for specific traffic. Connects to an ip of 192.168.2.10 as a static IP. Does not connect to a router, only a switch for direct routing connection. I have 4 IP addresses I need to access on the LAN: 192.168.2.1 192.168.2.21 192.168.2.20 192.168.2.30 The rest of the traffic needs to go to WIFI. I have tried setting up a routing table for the specific ip addresses, but I only managed to mess up my network. I do not venture out into the world of networking too often, but this was the latest command I have been trying: sudo route add -host 192.168.2.30 -interface en0 This command killed my ability to use ping. It told me that ping could not allocate memory (is that even possible)? It also killed my wifi access. Logging out and back in fixed the issue. I really do not mind to make this solution permanent, so I am fine with a temporary routing. EDIT: If I currently have been trying: sudo route flush sudo route add default 192.168.19.1 This gets everything to work for about a minute. But after such minute it "forgets" the routing to WiFi while retaining LAN's (en0) routing. If I unplug and replug my LAN (en0) cable, the process works for another minute.

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• SQL Server on Linux

  - by TimothyAWiseman

  For a particular project that is coming up, I am trying to expand my knowledge of Linux, so I am going to set up a Linux system at home. Rather than dual booting, I am thinking about putting SQL Server on a Windows Virtual Machine with Linux as the host at least until this project is over when I will probably switch back to Linux. So, I have a couple of different, but interrelated questions: How well does this work? This is only a test machine at home, so I can easily accept a fair bit of degradation, but if it is going to be a horrible reduction in performance I will dual boot instead. Is there a particular virtual machine manager I should look at to go this route? Since this is my personal machine, price is an issue but I am quite happy to pay a reasonable amount. And finally, given the choice of VMM, is there a particular Linux Distro I should be looking at? [This has been cross posted at Ask.SqlServerCentral.com . I think it may be appropriate at both sites. ]

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• Toshiba laptop cd drive read causes OS to totally freeze

  - by Fujishiro

  Okay I'll try to write an understandable summary. Forgive me if I'll fail with that attempt though. So. There is a Toshiba Satellite notebook. Got Windows 7 x86 Professional (OEM) installed on it, everything is fine (okay.. somewhat). The problem. If you put an audio or any kind of disc into the drive, something starts to eat the PC. Back then when the owner told me about this, he put an audio disc into the lappy. Winamp caused the IO load, 100%. Tried taskkill, taskkill /T, tried powershell, EVERYTHING. You just can NOT kill winamp or anything which becomes the blocker at that time. Even if you kill almost everything, laptop won't do a clear shutdown. Also I tried to use the force switch at 'shutdown' from cmd, but no use. (So: At these times you can use the laptop, but the blocker/explorer/disc becomes gray as a non-responding app. You can try to kill them, but that won't work, nor you can shutdown the machine). (Also tried using PID, but no use. For the highest IO I used the "select columns" from Task Manager and enabled the IO columns.) My first hunch was the problematic disc, autoplay and it tries to read tries to read (still shouldn't kill the PC). Disabled autoplay, removed winamp. Tried other software, etc. Everything was ok. Few days later the owner tried to put a disc into the machine and it started to reproduce the same symptoms but with a totally different disc. Uhm what to know. Virus is not an option, protected by BitDefender (valid license) and Spybot. Thanks if you have ANY idea about this strange problem. ps.: For now, the owner uses Daemon tools + Blindwrite as an alternative for those apps which wouldnt start without the disc.

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• Multiple cable adapter setup not working - VGA to smartphone. All cables tested and work

  - by Christopher Rucinski

  Issue Pictured overhead projector setup does not work. #1 - #2 - #3 - Phone. All cables are tested and work! The issue is the HDMI connection between cable #2 and #3. With all other cables, the screen will automatically be displayed onto the projector screen. No extra work needed. With the pictured setup, the smartphone screen is not displayed onto the projector screen. What is the issue with the HDMI connection?? Background We recently had to do presentations at work (school), but the administration only provided VGA means of hooking up to it. Mostly likely reason probably dealt with cost. Anyways, there are several teachers that have brand new Samsung Series 9 ultrabooks (or similar). You know, the ones without VGA support. So I bought an adapter for those ultrabooks. Cable #5 in the picture below. However, both my coworker and I have been wanting to just display our phone screens on the projector. This I knew would require some extra work. What I have VGA cable to projector (cables go through the wall) For laptops HDMI to VGA cable For laptops MHL adapter For 11-pin microUSB phones microHDMI to VGA cable For ultrabooks 11-pin to 5-pin microUSB adapter For older 5-pin microUSB phones) Equipment Projectors 1 projector with VGA and HDMI input (issue is coworkers forget to switch sources) 1 projector with VGA only input Laptops 2 new Samsung ultrabooks w/o VGA or HDMI support 1 ultrabook with VGA and HDMI support several other laptops with at least VGA support 1 tablet with 11-pin microUSB at least 1 new phone with 11-pin microUSB at least 1 old phone with 5-pin microUSB Tested VGA cable (#1) to laptop Good VGA cable (#1) to HDMI adapter (#2) to laptop Good VGA cable (#1) to microHDMI adapter (#5) to laptop Good Projector to HDMI cable (not shown) to MHL adapter (#3) to Galaxy Note 3 smartphone Good VGA cable (#1) to HDMI adapter (#2) to MHL adapter (#3) to Galaxy Note 3 smartphone Does not work!! Extra Notes The 11-pin MHL adapter will not fit inside the 11-pin to 5-pin microUSB adapter so older phones can be displayed on the screen.

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• Force SSL on one page via .htaccess without looping

  - by Will Martin

  Okay, I have this code: RewriteCond %{HTTPS} off RewriteCond %{REQUEST_URI} ^/borrowing/ill/request\.php$ RewriteRule ^.*$ https://%{HTTP_HOST}%{REQUEST_URI} [R,L] The way I would expect this to work is: A request for /borrowing/ill/request.php comes in on HTTP. The rule matches. The server redirects to HTTPS. The rule does not match, because HTTPS is now on. The way it actually works is: A request for /borrowing/ill/request.php comes in on HTTP. The rule matches. The server redirects to HTTPS. The rule matches. The server redirects to HTTPS. The rule matches. The server redirects to HTTPS ... And so on. I know that the second condition (matching the file name) is working, because the redirect loop only hits that specific page. The question is, why isn't the switch to HTTPS causing the first condition to not match? EDIT: I put the exact same .htaccess rules into a test area on another server -- same file and path info. And they worked just fine. There's got to be something wrong with the server configuration elsewhere.

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• Why do I get this message from chrome when navigating to https://www.amazon.com?

  - by Denis

  This is probably not the site you are looking for! You attempted to reach www.amazon.com, but instead you actually reached a server identifying itself as *.voxcdn.com. This may be caused by a misconfiguration on the server or by something more serious. An attacker on your network could be trying to get you to visit a fake (and potentially harmful) version of www.amazon.com. Intermittently, I get a blank page when going to http://www.amazon.com. So I stuck an 's' in the URL, making it https://www.amazon.com and got that message above (with the nice red screen) from Chrome indicating there might be some monkey business going on. After hammering on the URL a bunch of times and pulling it up in Chrome's developer tool to look at the network traffic on it, the url (without the s) started behaving. The url with the s just hangs, but the red screen no longer comes up. Some specs... I've got a macBook Pro, Snow Leopard, Time Warner cable. I've had enough strange stuff happening over the past couple months (google.com, youtube.com, amazon.com not coming up or loading strange error messages with random reference numbers) that I finally decided to switch to OpenDNS. Still having problems, though.

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• How to keep Ubuntu 11.10 and Kate editor w/terminal from changing command line when changing tabs?

  - by Kairan

  I am programming C using Kate editor in Ubuntu 11.10. It works great, but when I change tabs in Kate, the terminal line changes to the file path of the tab I click on. Normally this is not a big deal (other than annoyingly adding extra text to my terminal) however if I am currently RUNNNING a C program, it obviously will type at the command line, which is not so cool. Example terminal window for my C program (its at a menu): 1) select opt 1 2) select opt 2 Enter choice: (here it waits for prompt from user) Now when I click a tab in Kate, it wants to put in the cd / path of the file in that tab, such as: cd /home/user/os/files And of course since my terminal was waiting for prompt from user it gets that command.. not good. Perhaps there is no fix, but maybe someone knows? Obviously I could choose NOT to switch tabs or end program before switching tabs... Note: I probably made the mistake of putting this under StackOverflow which is more of a programming area - so though repost here might be best (I am not sure how to link the questions but will paste hyperlink to that post - I dont want to violate any stackoverflow/superuser violations) Suggestions on merging them are welcome or if I should delete one? StackOverFlow Question

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• RRAS NAT not working on a certain computer

  - by legenden

  This is driving me crazy. I have a virtualized W2K8 server running RRAS. Every other computer or server on the network can access the internet through the NAT except one. On one server, it just won't work. I can ping the ip address of the NAT gateway just fine, and everything else works. (SMB, etc) DNS, which is hosted by the same server, also works just fine. I have even reinstalled the OS on the problem server and it still doesn't work. Recap of the steps I tried: There are 3 network cards in the server, I tried every one and different switch ports. Not a hardware problem. Reinstalled W2K8 R2 on server with the problem, didn't help. Tried the IP of the internet gateway directly - this did work (!). But I need NAT to work. All firewalls are disabled. Removed computer from domain, deleted computer membership in Active Directory Users and Computers and added it back. Disabled all other network adapters and set a static ip and specified the gateway ip manually. When I tracert a public IP, the first hop (or any other hop) comes up as: C:\>tracert www.google.com Tracing route to www.l.google.com [209.85.225.106] over a maximum of 30 hops: 1 * * * Request timed out. 2 * * * Request timed out. From a different computer, on which NAT works, the first hop comes up as: tracert www.google.com Tracing route to www.l.google.com [209.85.225.105] over a maximum of 30 hops: 1 <1 ms * <1 ms xxxx [10.5.1.1] This is the most bizarre problem I ever came across, and I realize that it's a long shot asking it here given all the details, but I'm pulling my hair out. Maybe someone has an idea...

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• Most transparent way to connect two LANS using a WET610N Wireless Bridge

  - by Spencer Ruport

  I have two wired systems hooked to a Linksys WRT54GL wired/wireless router which is also hooked to my internet. I'll refer to this as LAN1. I have two more systems in another room that are connected wirelessly. Recently I decided I would much rather have another wired LAN in the other room and use a bridge to connect them. This would be LAN2. Prior to hooking up the device I assumed that the ethernet side of the bridge would have a DHCP server so that I could simply hook it up to a switch and I'd be on my way. However that isn't the case which leads me to believe I'll have to add one to LAN2 correct? Or is there some way to have the DHCP from LAN1 also hand out IP addresses to LAN2? If I do need a DHCP device on LAN2 what would be best? Another hardware device or should I just install some DHCP software on one of the systems (since they're both on 24/7 anyway). Any recommendations would be appreciated. :)

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• Acer Aspire one is falling apart on Ubuntu

  - by Narcolapser

  Question: How do I have my netbook detect and install hardware? Info: I have an Acer Aspire One, it came with windows XP and I loaded it with Win7. I decided I wanted to change to Ubuntu so I tried Ubuntu netbook remix, which failed horribly, and so after attempting 3 or so other OS's I ended with Ubuntu Desktop 9.10. Which worked fine for a while, but there were some minor issues so I asked a question about it here and decided to change my OS again. This last weekend I tried mandriva like that guy in my other question suggested, no success. when I had though my netbook lost the ability to use it's touch pad, I didn't think much of it, just thought it must be a driver or something. But When Mandriva failed, and I also while I was at it tried Damn small linux and Debian, which both failed to, I decided to switch back to Ubuntu Desktop(some where in here my keyboard stopped working for one attempt to). But first I gave the netbook remix one more try. it worked this time, with the exception of it didn't have any networking. I thought it was a driver issue again and finished the weekend with ubuntu desktop 9.10 again. But now things get really crazy. it doesn't know it has a wireless card or an ethernet card. It doesn't know my phone is connected trying to provide wireless broadband either. I'm clueless on what could be the problem. And with only a minimal amount of experience with Ubuntu can't navigate the entire interface with only my keyboard(it doesn't detect a USB mouse when I plug it in, it had when I installed it. in fact the network interfaces were working just fine when I live boot ubuntu to installed it). Even so, I don't know where to go or what to do to make it recognize it's hardware. I'm in a dire situation, any help is welcome.

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• Moving automatically spam messages to a folder in Postfix

  - by cad

  Hi My problem is that I want to automatically to move spam messages to a folder and not sure how. I have a linux box giving email access. MTA is Postfix, IMAP is Courier. As webmail client I use Squirrelmail. To filter SPAM I use Spamassassin and is working ok. Spamassasin is overwriting subjects with [--- SPAM 14.3 ---] Viagra... Also is adding headers: X-Spam-Flag: YES X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on xxxx X-Spam-Level: ************** X-Spam-Status: Yes, score=14.3 required=2.0 tests=BAYES_99, DATE_IN_FUTURE_24_48,HTML_MESSAGE,MIME_HTML_ONLY,RCVD_IN_PBL, RCVD_IN_SORBS_WEB,RCVD_IN_XBL,RDNS_NONE,URIBL_RED,URIBL_SBL autolearn=no version=3.2.5 X-Spam-Report: * 0.0 URIBL_RED Contains an URL listed in the URIBL redlist * [URIs: myimg.de] * 3.5 BAYES_99 BODY: Bayesian spam probability is 99 to 100% * [score: 1.0000] * 0.9 RCVD_IN_PBL RBL: Received via a relay in Spamhaus PBL * [113.170.131.234 listed in zen.spamhaus.org] * 3.0 RCVD_IN_XBL RBL: Received via a relay in Spamhaus XBL * 0.6 RCVD_IN_SORBS_WEB RBL: SORBS: sender is a abuseable web server * [113.170.131.234 listed in dnsbl.sorbs.net] * 3.2 DATE_IN_FUTURE_24_48 Date: is 24 to 48 hours after Received: date * 0.0 HTML_MESSAGE BODY: HTML included in message * 1.5 MIME_HTML_ONLY BODY: Message only has text/html MIME parts * 1.5 URIBL_SBL Contains an URL listed in the SBL blocklist * [URIs: myimg.de] * 0.1 RDNS_NONE Delivered to trusted network by a host with no rDNS I want to automatically to move spam messages to a folder. Ideally (not sure if possible) only to move messages with puntuation 5.0 or more to folder.. spam between 2.0 and 5.0 I want to be stored in Inbox. (I plan later to switch autolearn on) After reading a lot in procmail, postfix and spamassasin sites and googling a lot (lot of outdated howtos) I found two solutions but not sure which is the best or if there is another one: Put a rule in squirrelmail (dirty solution?) Use Procmail Which is the best option? Do you have any updated howto about it? Thanks

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• Why won't 2GB of ram across 3 of 4 slots work on my motherboard (max 2GB)?

  - by Andrew

  My desktop is an old home-built machine circa 200[5-6] running Ubuntu 11.10 (but this is not relevant because I'm reading available ram from BIOS loading screen), with an ASUS P5GPL motherboard, not X or X-SE - it has four slots. I'm mainly a laptop person, but keep this around for running a server from if needed, backing up to, seeding Ubuntu to people from, etc… It has four (DDR) ram slots, two black and two blue, in the order black-blue-black-blue (I will call them D, C, B, and A, respectively) with some space in the middle. The blue ones are the closest to the processor. I used to have two 512MB chips in the two blue slots. I just got a 1GB chip and plugged it into one of the black slots; my system didn't recognize it. I messed around and discovered that it will not recognize chips in many positions, and I couldn't get it to recognize all three of these chips at the same time. In particular, if I put the 512MB chips in A and B it would only use 1, but AC, AD, BD, and CD worked. I didn't try BC, I believe. Only some of these continue to work when I switch the 1GB chip into one of these positions. Can I have some advice as to how to position these chips to get all 2GB used? How about if I get another 1GB chip - where should I put the two? And what about the RAM maximum Crucial says? Can I go above 2GB, if I get another 1GB chip? Right now, I have a 512MB chip in A and the 1GB chip in C. EDIT: I read some other posts and tried dmidecode in Ubuntu to clarify the max memory question, that wasn't a major part anyways. It says my max memory module size is 1024M (OK) and my max memory size is 4096M (doesn't agree with Crucial OR the Asus web site, maybe it will only work while in Linux and BIOS won't OK it?).

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• HP LaserJet 2550 has a carousel motor error

  - by Arlen Beiler

  I have a LaserJet 2550, and it's worked pretty good for a long time (except for some slowness a while back, spooling I think), but just recently it suddenly quit working. We moved this summer, but left it at our other place, and just recently when my Dad went over there to try to print something out, it didn't work. When you turn it on, you hear the fan give a false start (basically a quick pulse), and the carousel goes through its usual thing. Then it starts up in earnest like it's getting ready to print something. All of a sudden it just stops. Everything stops, and the three lower lights are steady. When I push the Go button, the Go light (bottom of the 3) turns off, but the other two stay on. I looked it up on the HP website and it says it is a carousel motor problem. I called HP, but they said it is out of warranty. I've opened the cover and held the switch with a screw driver so I could watch it, and it goes through its thing like I described (doesn't seem to make a difference whether the imaging drum is in or not), then when it stops it kind of seems to jump back a little bit (the carousel). I hope this all makes sense (I know you like details), and hopefully you also know what to do to fix it. Thanks.

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• Automatically install driver on headless WHSv1 system

  - by Dan Neely

  I have one of the HP Mediasmart Windows Home Server v1 boxes. It's network port appears to have died a few days ago but the system is not giving any other sign of failure: No activity lights activate on either side of the cable when connected to my gigabit switch; when connected to one of my routers 100 megabit ports the lights turn on but it remains unreachable over the network and my router never lists it as among DHCP clients. I bought a USB-ethernet adapter to temporarily get it back online; but the adapter needs a driver to work which I can't install because the system is headless by design (no video out, no PCI/PCIe slots) with admin access only available via the WHS client or remote desktop. Both of those options require network connectivity and are consequently unavailable. I tried copying the drivers to a flash drive; but Windows either didn't look there or none of the drivers provided were suitable (Win8, Win7, or combined XP and Vista). I've been told that a USB WiFi adapter would have the same driver problem.

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• Long Gigabit Ethernet Run

  - by Timothy R. Butler

  I am trying to get an Gig-E network between two buildings that are approximately 260 ft. away. While some TRENDnet switches failed to be able to connect to each other over Cat 6 at that distance, two Netgear 5-port Gig-E switches do so just fine. However, it still fails after I put in place APC PNET1GB ethernet surge protectors at each end before the line connects to the respective switches. So I find myself wondering if I simply need to find a better surge protector that doesn't degrade the signal as much (if so, what kind would you recommend?) or if I should give up on copper and use fiber between the buildings. If I opt to go the latter route, I could really use some pointers. It looks like LC connectors are the most common, but I keep running into some others as well. A media converter on each end seems like the simplest solution, but perhaps a Gig-E switch with an SFP port would make more sense? Given a very limited budget, sticking with my existing copper seems best, but if it is bound to be a headache, a 100 meter fiber cable is something I think I can swing cost wise.

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• Sophos UTM in Hyper-V

  - by TheD

  So, I had a previous thread about this Virtualizing Firewalls/UTM. Essentially, I have configured what I think would work, but networking isn't my strong point! Two Virtual Adapters - with IP addresses 192.168.0.2 (External) and 192.168.0.3 (Internal) respectively. The External Adapater looks at 192.168.0.1 (my Zyxel) for it's default gateway. The Internal Adapter, 192.168.0.3, which is what the Sophos UTM listens on, has it's default gateway set to 192.168.0.2, the IP of the External Lan interface. So, PC (192.168.0.11, DHCP) --> (LAN) --> Switch --> 192.168.0.3 (Internal LAN Interface IP) --> Sophos UTM --> 192.168.0.2 (External LAN Interface IP) --> 192.168.0.1 --> Internet Would this be the correct setup, or am I completely out of the game here? Cheers!

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• How to set up ProxMox 1.9 on VPN?

  - by Gnudiff

  Disclaimer: I have only rudimentary knowledge of VPNs. I would love to learn about them properly, however, at the moment I really need to make stuff work on short notice. I am trying to set up a ProxMox virtualization platform in an existing network. The network currently consists of several servers which have VMWare free edition. There is some sort of VPN defined in switch. In order for VMWare management interface to be accessible, there needs to be ticked a checkbox in the network settings for VPN and entered the VPN id. I didn't notice any such configuration option during ProxMox installation, so my Proxmox VE on the same physical server, using same manual IP settings (ip/nm/gw), is not accessible. As I understand I should touch the Proxmox's underlying Debian config in /etc/network/interfaces, but I have no idea, what should I aim for: do I specify the settings for eth0, do I make a virtual interface? How to make it accessible for both ProxMox VE and underlying future VMs? I read the ProxMox installation guide, but unfortunately it presumes better understanding of VPNs than I have. A config template or similar would be appreciated. Thanks in advance.

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• Packet drop measured by ethtool, tcpdump and ifconfig

  - by Rayne

  Hi all, I have a question regarding packet drops. I am running a test to determine when packet drops occur. I'm using a Spirent TestCenter through a switch (necessary to aggregate Ethernet traffic from 5 ports to one optical link) to a server using a Myricom card. While running my test, if the input rate is below a certain value, ethtool does not report any drop (except dropped_multicast_filtered which is incrementing at a very slow rate). However, tcpdump reports X number of packets "dropped by kernel". Then if I increase the input rate, ethtool reports drops but "ifconfig eth2" does not. In fact, ifconfig doesn't seem to report any packet drops at all. Do they all measure packet drops at different "levels", i.e. ethtool at the NIC level, tcpdump at the kernel level etc? And am I right to say that in the journey of an incoming packet, the NIC level is the "so-called" first level, then the kernel, then the user application? So any packet drop is likely to happen first at the NIC, then the kernel, then the user application? So if there is no packet drop at the NIC, but packet drop at the kernel, then the bottleneck is not at the NIC? Thank you. Regards, Rayne

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• Dell Inspiron 1564 overheating but fan not switching on, how to diagnose?

  - by Smugrik

  I've got a Dell Inspiron 1564 laptop that is about one and a half years old. Since about a week, the laptop started to overheat, causing it to switch off unexpectedly... The cpu fan is working erratically, it can start to spin for a while, doing its job and cooling down the cpu before it stops, but then the temperature goes up, and the fan doesn't reacts, once the temperature reaches a critical point (over 85 celsius, checked with speedfan...), the laptop switches off... I already cleaned the vents and fan from dust, to no avail, and it was actually quite clean anyway. Drivers and bios are up-to-date, no crapware was ever installed on this machine. I don't know how to diagnose the problem, could it be the temperature sensors that sends wrong information, so the fan doesn't reacts? but then I believe the computer wouldn't detect the overheat and stop... Is there a way I can pin point the problem? Maybe some low-level diagnostic tools to check functionality of sensors and fans??? The warranty is already over so any suggestion would be welcome. Thanks!!

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• Mac OS X Client With Static DHCP Assignment Requests Wrong IP via Option 50

  - by Starchy

  I have a number of Mac (and a few Linux) laptops getting DHCP from a Force10 layer 3 switch, the only DHCP server on the subnet. There's a global dynamic pool, and for each full-time employee's laptop I have a single IP static pool set by MAC address. One and only one of the clients, running OS X 10.7.5, consistently fails to get a static assignment. The MAC address in the static pool definition has been carefully re-checked. Running tcpdump on a mirrored port when the laptop connects, I see that it is specifically requesting 10.100.0.252 (a dynamic address): 11:32:10.108280 IP (tos 0x0, ttl 255, id 28293, offset 0, flags [none], proto UDP (17), length 328) 0.0.0.0.bootpc > broadcasthost.bootps: [udp sum ok] BOOTP/DHCP, Request from 3c:07:54:xx:xx:xx (oui Unknown), length 300, xid 0x1399da89, Flags [none] (0x0000) Client-Ethernet-Address 3c:07:54:xx:xx:xx (oui Unknown) Vendor-rfc1048 Extensions Magic Cookie 0x63825363 DHCP-Message Option 53, length 1: Request Parameter-Request Option 55, length 9: Subnet-Mask, Default-Gateway, Domain-Name-Server, Domain-Name Option 119, LDAP, Option 252, Netbios-Name-Server Netbios-Node MSZ Option 57, length 2: 1500 Client-ID Option 61, length 7: ether 3c:07:54:xx:xx:xx Requested-IP Option 50, length 4: 10.100.0.252 Lease-Time Option 51, length 4: 7776000 Hostname Option 12, length 10: "host-name" END Option 255, length 0 PAD Option 0, length 0, occurs 8 I haven't been able to find any extra system prefs or unusual software on the laptop. Disabling the interface and rebooting or temporarily setting the IP manually both fail to make any difference. Any suggestions appreciated.

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• Should I enabled 802.3x hardware flow control?

  - by Stu Thompson

  What is the conventional wisdom regarding 802.3x flow control? I'm setting up a network at a new colo and am wondering if I should be enabling it or not. My oh-cool-a-bright-and-shiny-new-toy self wants to enable it, but this seems like one of those decisions that could blow up in my face later on. My network: An HP ProCurve 2510G-24 switch A pair of Debian 5 HP DL380 G5's with built-in NC373i 2-port NIC LACP'd as one link. 9000 jumbo frames enabled. (Application) A pair of hand-built Ubuntu server with 4-port Intel Pro/1000 LACP'd as one link. 9000 jumbo frames enabled. (NAS) A few other servers with with single 1Gbps ports, but one with 100Mbps. Most of this kit is 802.3x. I've been enabling it as I go along, and am about to test the network. But as my 'go live' day nears, I am worried about the 802.3x decision as I've never explicitly used it before. Also, I've read some 10-year old articles out there on the Intertubes that warn against using flow control. Should I be enabling 802.3x hardware flow control?

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• Using two ports on my ZyXel USG gateway to patch two devices together?

  - by Matthew Beza

  I don't know if this is possible but it would save me many long drives! I have drawn, with my epic MS Paint skills, my current setup. I have a ZyXel USG300 Gateway with a built in 5 port switch. It supports bridging, tunnles, VLANs, etc.. I have a Cisco WLC2112 plugged into port 6 (P6). The cisco is set to 192.168.6.2 and P6 is set to 192.168.6.1. This works but I need to incorporate a Nomadix AG3000 to handle guests. (Router (A) in the picture). So I need the Cisco WLC2112 to use the Nomadix as if it where plugged into it's LAN port. Right now the Nomadix WAN Port is plugged into (P2) on the ZyXel, and the Nomadix LAN port is plugged into (P3). Is it possible to set something up where (P3) and (P6) are somehow "Patched" as if the Cisco was plugged directly into the Nomadix LAN port? Basically making the ZyXel a fancy Cat5e coupler?

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• Windows won't sleep after booting from grub

  - by mkasberg

  I recently added a second hard drive to my computer and I am using it do dual-boot Linux (Ubuntu 12.04) with Windows 7. Both hard drives are SATA. I am using the default grub bootloader on my second hard drive. The windows drive is unmodified. To get to grub, I changed the hard disk boot priority in my BIOS (P35-DS3L) to boot from the second drive. The problem I'm having is that when I boot to Windows 7 (on sda) from grub (on sdb), Windows 7 will not go to sleep (from the start menu). The display shuts off momentarily as if its going to sleep, then comes back on and displays the switch-user screen. Powercfg -lastwake does not show anything. I am sure that this is related to booting from grub on sdb because when I change the hard disk boot priority in the BIOS to boot from my (unmodified) Windows hard disk, the computer goes to sleep fine. It occurred to me that installing grub on sda might solve the problem, but I'd rather not since I like to have my windows hard disk unmodified so that booting to it from the BIOS boots directly to windows. A possible work around is to use the BIOS as a bootloader, by pressing F8 to select the boot device. Still, I'd like to know why the problem is happening in the first place.

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• How can I find out which processes on my computer are accessing the microphone?

  - by Vinayak

  After reading this interesting Lifehacker post and reading the comments on the page, one person was wondering if it would be possible to use the Physical Device Object Names of other hardware such as the microphone to find out the names of processes using that device. I tried the same approach, but so far it only seems to work for the webcam. Is there any other way I could get this to work in Process Explorer? UPDATE: The Lifehacker post was about finding out which Windows process is currently using your webcam. This is how they went about doing it: Start Device Manager (WIN+R → "devmgmt.msc" → OK) Find your webcam among the list of devices (check under Imaging Devices) Open the properties window of the device and switch to the Details tab (Right click → Properties → Details) In the dropdown menu, select Physical Device Object Name and copy the string(Right click → Copy) Download Process Explorer Make sure you have opened Process Explorer in Administrator Mode(File → Show Details for All Processes) Hit CTRL+F and enter the string you copied earlier(it should be something like \Device\000000XX) Hit the Search button and you should see a list of processes using the webcam(if there are any)

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• Change the default route without affecting existing TCP connections

  - by Patrick Horn

  Let's say I have two public network addresses on my server: one NAT through an ISP (192.168.99.0/24), and a VPN through a different ISP (192.168.1.0/24), already configured with a per-host route to the VPN server through my ISP. Here is my initial routing table. I am currently routing through my ISP on subnet 192.168.99.0/24. $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.99.1 0.0.0.0 UG 0 0 0 eth1 55.66.77.88 192.168.99.1 255.255.255.255 UGH 0 0 0 eth1 192.168.99.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 tap0 Now, I want new TCP connections to switch to my 192.168.1.0/24 so I type the following: $ route add -net 0.0.0.0 gw 192.168.1.1 dev tap0 When I do this, it causes some long-standing TCP connections to hang. Is there a way to I safely change the default interface for new connections, while allowing existing TCP connections to use the old route (i.e. do I need enable some sort of stateful routing table)? I am okay with a solution that only works with established TCP connections, and I don't care how hacky it is. For example, if there is a way to add temporary iptables rules for existing connections to force them over the old route. But there has to be some way to do this. EDIT: Just a note about a simple "route add -host ... " for existing connections: this solution would work if I am fine with leaving a subset of IPs on the old interface. However, in my application, this actually doesn't solve my problem because I want to allow new connections to come on the new interface even if they have the same source IP. I'm now looking at using the "ip route" command to set source-based routing rules.

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