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Connect to Nonencrypted Wireless Network Using Ubuntu Commands

- by Tim

I failed to connect to an open i.e. nonencrypted wireless network using Ubuntu command lines. Here is what I did: $ sudo /etc/init.d/NetworkManager stop * Stopping network connection manager NetworkManager [ OK ] $ sudo /sbin/ifconfig wlan0 up $ sudo iwconfig wlan0 essid "Cavalier High-Speed 866-4-CAVTEL" $ sudo dhclient wlan0 There is already a pid file /var/run/dhclient.pid with pid 10812 killed old client process, removed PID file Internet Systems Consortium DHCP Client V3.1.1 Copyright 2004-2008 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ wmaster0: unknown hardware address type 801 wmaster0: unknown hardware address type 801 Listening on LPF/wlan0/00:0e:9b:cd:4e:18 Sending on LPF/wlan0/00:0e:9b:cd:4e:18 Sending on Socket/fallback DHCPREQUEST of 192.168.1.67 on wlan0 to 255.255.255.255 port 67 DHCPREQUEST of 192.168.1.67 on wlan0 to 255.255.255.255 port 67 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 8 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 21 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6 No DHCPOFFERS received. Trying recorded lease 192.168.1.67 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. --- 192.168.1.1 ping statistics --- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms Trying recorded lease 192.168.1.45 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data. --- 192.168.1.1 ping statistics --- 1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms No working leases in persistent database - sleeping. $ sudo /sbin/iwconfig wlan0 wlan0 IEEE 802.11bg Mode:Managed Frequency:2.422 GHz Access Point: Not-Associated Tx-Power=27 dBm Retry min limit:7 RTS thr:off Fragment thr=2352 B Encryption key:off Power Management:off Link Quality:0 Signal level:0 Noise level:0 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 I was wondering what the problem is and how I can do it right? Thanks and regards!

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Single m0n0wall - Two LAN Subnets - How To Setup

- by SnAzBaZ

I have two LAN subnets that I need to link together they are 192.168.4.0/24 and 192.168.5.0/24 There is a m0n0wall running on 192.168.4.1. It's LAN connection goes out to our network switch, and it's WAN port goes out to our ADSL modem. WAN is connected via PPPoE. The 192.168.4.0 subnet contains all of our office workstations. The 192.168.5.0 subnet contains development servers and test machines that need to obtain internet access and be "managed" by computers on the 192.168.4.0 subnet, but need to be on their own subnet as well. I have a Draytek 2820N configured on 192.168.5.1 with it's WAN2 port configured as 192.168.4.25 and a default gateway of 192.168.4.1. Machines on the 5.0 subnet can connect to the internet via the m0n0wall just fine. I configured a static route on the m0n0wall LAN interface, Network 192.168.5.0/24 and Gateway 192.168.4.25. Machines on the 5.0 subnet can ping machines on the 4.0 network but the reverse does not work. I configured a new firewall rule on the m0n0wall that allows any traffic on the LAN interface with a source IP of 192.168.4.25 to be allowed. The DrayTek firewall is currently configured to pass all traffic regardless. When I try to ping a machine in the 5.0 subnet from 4.0 I see this in my m0n0wall log: BLOCK 14:45:27.888157 LAN 192.168.4.25 192.168.4.37, type echoreply/0 ICMP So the reply is being sent from the 5.0 subnet but is not being allowed to reach my workstation because the firewall is blocking it. Why is the firewall blocking it ? I hope the explanation of my network is clear, please ask if you require further clarification. Thank you.

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Custom Extensions on Managed Chromebooks

- by user417669

I am a developer looking for the best way to set up different schools with their own custom, private extensions (ie School A should be the only one with access to Extension A). Theoretically, I am aware that there are a few ways to get a custom, private extension pushed out on a domain: Host the .crx on a server and click "Specify a Custom App" in the management console. Create a Domain App by uploading a zip to the Chrome Web Store Upload the extension from my developer account to the Chrome Web Store and publish to a single "trusted tester," or make it unlisted Option (1), hosting the .crx, has not been working. I am not sure why, but the extension is simply not pushing out. I link directly to the crx file, which has the right ID and MIME type, still, no dice. If anyone has any tips or suggestions for getting this to work, I would love to hear them! Option (2), having the school create a domain app, seems a bit inefficient because it requires all schools to upload their own zip. So essentially I would have to email a zip file to the school, and have them publish it. All updates to the extension will also require a similar process, so this doesn't seem ideal. I doubt that option (3) would work. If I published to the admin as a "trusted tester", I don't think that the other people in the domain would be able to access it. If it is unlisted, I do not know how an admin could find it in the Chrome Web Store dialog. Also, I would rather avoid security through obscurity. Has anyone had success with hosting the extension and using the Specify a Custom App feature? Any other suggestions for getting a Custom Extension pushed out by the management console? Thanks so much!

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Windows Phone sync error when syncing with iTunes on different Hard Drive

- by njallam

I have my iTunes library file on a separate hard drive (which I believe may be the cause of the problem) and I have been trying to use it to synchronize with my Windows Phone. I would like to first note that if I set up my phone to synchronize with 'Windows Libraries', then it works fine. This is however not ideal as I have categorised my music and made playlists etc, on iTunes. When I first link my Windows Phone to the Windows Phone App (for desktop) and select iTunes from the above selection, I get the following error message: After searching that error, I found the following forum threads: Fix for error 8300300B when trying to sync Lumia 920 Windows 8 Phone in PC? Error code 8300300B on Windows Phone 8 while trying to sync I've tried the workarounds described in the above threads, however, they did not work for me. If I ignore that error message, I see the expected interface, along with all of my iTunes library's media, however the 'Sync' button is greyed out. I have tried some other things to try and fix this: Removing the app's AppData folder Uninstalling, reinstalling Using the full-screen modern app (does not allow for iTunes syncing)

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Numbered paragraphs in Word 2007

- by Kit

I have the following styles defined in Word 2007. They all have outline levels 1-6. They also correctly show up in the Table of Contents (not all, I only set the TOC up to Level 3). 1 Heading 1 1.1 Heading 2 1.1.1 Heading 3 1.1.1.1 Heading 4 1.1.1.1.1 Heading 5 1.1.1.1.1.1 Heading 6 This is what I want 1 Heading 1 1.1 Body text under Heading Level 1 1.2 Body text under Heading Level 1 2 Heading 1 2.1 Heading 2 2.1.1 Body text under Heading Level 2 2.1.2 Body text under Heading Level 2 2.1.3 Body text under Heading Level 2 2.2 Heading 2 2.2.1 Body text under Heading Level 2 2.2.2 Body text under Heading Level 2 How do I make two list sequences link to each other? Here's a {fill in the blanks} illustration: {section number} Heading 1 {section number}.{clause number} Body text under Heading Level 1 {section number}.{clause number} Body text under Heading Level 1 The example above should expand to: 1 Heading 1 1.1 Body text under Heading Level 1 1.2 Body text under Heading Level 1 Another example: {section number} Heading 1 {section number}.{subsection number} Heading 2 {section number}.{subsection number}.{clause number} Body text under Heading Level 2 {section number}.{subsection number}.{clause number} Body text under Heading Level 2 should expand to: 2 Heading 1 2.1 Heading 2 2.1.1 Body text under Heading Level 2 2.1.2 Body text under Heading Level 2 2.1.3 Body text under Heading Level 2 The numbered body text paragraphs shouldn't show up the Table of Contents. I couldn't find the right way to do that, whether in multilevel lists, fields, styles, etc. How do I do it right?

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Why do I have to log into hotmail twice?

- by Tony Lee

I just recently noticed I have to attempt a login into hotmail twice before it succeeds. Although I'm using Google Chrome (3.0.195.21), the symptoms are well described in a Mozilla thread. In short, I'm told: The e-mail address or password is incorrect. Please try again. The thread on mozilla's site that supposed to describe the latest details (and the 1st hit on google when I search for "hotmail login twice") requires an account to read so I'm hoping someone here has a good synopsis of what the cause is. I normally start at hotmail.com, which redirects to login.live.com/.... I can login by starting at mail.live.com, using IE8 or attempting a 2nd login. Oddly, if I start at login.live.com Chrome tells me there is a redirect loop. Does anyone know or have a public link to the root cause of the double login? (it is a hotmail account I'm login into) EDIT - Caused by my 'restricting how 3rd parties can use cookies'. If I allow all cookies, it works first time.

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Asus K50I sound issues

- by MrStatic

I have an Asus K50IJ (Bestbuy) laptop and have issues with my sound. Speakers themselves work fine but when I plug into the headphone jack it auto mutes the front channel and no sounds comes out of either the speakers or the headphones. If I then unmute the channel I get sound from both the speakers and the headphones. alsamixer shows the Headphone channel as all grayed out. /etc/modprobe.d/alsa-base.conf I have tried snd-hda-intel model="asus-laptop" and snd-hda-intel model="asus" In Sound Preferences I have gone to output and changed the Connector to 'Analog Headphones' that results in no sound from either speakers or headphones. As one forum suggested I tried to comment out blacklist snd_pcsp in the blacklist.conf which resulted in no change. lspci -v shows: 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03) Subsystem: Santa Cruz Operation Device 1043 Flags: bus master, fast devsel, latency 0, IRQ 45 Memory at fe9f4000 (64-bit, non-prefetchable) [size=16K] Capabilities: [50] Power Management version 2 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00 Capabilities: [100] Virtual Channel Capabilities: [130] Root Complex Link Kernel driver in use: HDA Intel Kernel modules: snd-hda-intel

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High latency due to non-presence of a transit provider in my country

- by nixnotwin

My ISP, a state owned incumbent, buys bandwidth from different transit providers. Whenever it buys transits it announces only a specific prefix (in most cases a hitherto unused) through the new transit AS. For e.g. if it runs out of bandwidth, it buys bandwidth from a new transit and announces a new prefix through it, while the same prefix is not announced (or announced with lowest metrics, so that the routes are very rarely used) via the old transits which continue to provide bandwidth to it. I am a business customer, so I have a fiber based link to the ISP and a tiny subnet is given to me. The subnet which is provide to me is part of a prefix which is announced by the AS of a transit who, it seems, do not have a presence in my country. So when I do a trace the packets, when they leave my ISP's AS, they take about 275ms to reach the transit providers core router, which is located in USA (half the world away). Also for upstream traffic my ISP uses a transit provider (tier 1) who has a presence in my country. But the return path is always through the transit which is in USA. So, average latency is 400ms. All the users of other ISPs in my country discover my subnet via USA. Even the traffic from neighboring countries, from Europe (which is much nearer) follows the path via USA. Sites using CDNs also resolve to ips in USA. I have informed the ISP NOC about the issue and I have asked them to provide an ip subnet belonging to a prefix announced by a local transit (preferably a tier 1 transit provider) and I am waiting for a reply. My question: Is it a serious issue that I must follow up to get it resolved? When I compared the latency on other providers in my country, it is, in most cases, less than half of my ISPs latency. Why my ISP doesn't announce all its prefixes to all of its transit providers, so that the packets can take efficient and nearest routes to reach prefixes that originate within its network?

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Connect linux server to VPN server via PPTP

- by wowpatrick

I'm trying to connect a Linux (Ubuntu 10.04 LST) server to a VPN server via the PPTP client to an VPN server. I configured the PPTP client as said in the documentation. The connection is correctly added as an interface, but somehow the connection dose not work. ping -I ppp0 google.com dose not return anything and traceroute -i ppp0 only shows the first hop, and then displays nothing. Any ideas of what is going wrong? Incorrect routing configuration? ifconfig output for the configured interface: ppp0 Link encap:Point-to-Point Protocol inet addr:xx.x.xxx.xxx P-t-P:10.0.0.1 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1496 Metric:1 RX packets:415 errors:0 dropped:0 overruns:0 frame:0 TX packets:468 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:31428 (31.4 KB) TX bytes:32394 (32.3 KB) route output Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface xx.x.x.1 * 255.255.255.255 UH 0 0 0 ppp0 xx.xxx.xxx.xx sp.ip 255.255.255.255 UGH 0 0 0 eth1 192.168.3.0 * 255.255.255.0 U 0 0 0 eth2 192.168.2.0 * 255.255.255.0 U 0 0 0 eth1 default sp.ip 0.0.0.0 UG 100 0 0 eth1

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How to install 64bit version of Mongodb

- by slownage

How can I install the 64bit (x86_64) version of MongoDB? I've specified in the 10gen.repo the 64bit: baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64 But when I run: yum install mongo-10gen mongo-10gen-server It's the 32bit (see the i686) that it's set to be installed. Failed to set locale, defaulting to C Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.fdcservers.net * epel: mirror.steadfast.net * extras: mirror.fdcservers.net * rpmforge: mirror.rit.edu * updates: mirror.fdcservers.net 10gen | 951 B 00:00 Not using downloaded repomd.xml because it is older than what we have: Current : Tue Oct 30 15:55:02 2012 Downloaded: Tue Oct 30 15:54:51 2012 Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package mongo-10gen.i686 0:2.2.1-mongodb_1 will be installed ---> Package mongo-10gen-server.i686 0:2.2.1-mongodb_1 will be installed --> Finished Dependency Resolution Dependencies Resolved ====================================================================================================================================================== Package Arch Version Repository Size ====================================================================================================================================================== Installing: mongo-10gen i686 2.2.1-mongodb_1 10gen 42 M mongo-10gen-server i686 2.2.1-mongodb_1 10gen 6.5 M Transaction Summary ====================================================================================================================================================== Install 2 Package(s) Total download size: 48 M Installed size: 118 M I think I know why it want's to install the 32bit version: the first time I've made the 10gen.repo file I had in there the 32bit link specified, and installed the 32bit, which later I've deleted. Maybe something has been cached. Could someone help me out with this.

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TC hashing filters - single rule deletion

- by exa

For traffic shaping I'm currently using a setup that looks exactly like the setup from LARTC, on this page: http://lartc.org/howto/lartc.adv-filter.hashing.html I have a simple problem with that - everytime I want to modify something in the hash table (like assign a IP to different flowid), I need to delete the whole filter table and add it again filter by filter. (I actually don't do it by hand, I have a nice program that does it for me... but still...) There is a problem - I got roughly 10k filters allocated this way and deleting and refilling the whole filtertable can get pretty lengthy, which is not exactly good for traffic shaping. My program could easily manage to delete only the rules that need to be deleted (thus reducing the whole problem to several commands and miliseconds), but I simply don't know the command that deletes only the one hashing rule. My tc filter show: filter parent 1: protocol ip pref 1 u32 filter parent 1: protocol ip pref 1 u32 fh 2: ht divisor 256 filter parent 1: protocol ip pref 1 u32 fh 2:a:800 order 2048 key ht 2 bkt a flowid 1:101 match 0a0a0a0a/ffffffff at 16 filter parent 1: protocol ip pref 1 u32 fh 2:c:800 order 2048 key ht 2 bkt c flowid 1:102 match 0a0a0a0c/ffffffff at 16 filter parent 1: protocol ip pref 1 u32 fh 800: ht divisor 1 filter parent 1: protocol ip pref 1 u32 fh 800::800 order 2048 key ht 800 bkt 0 link 2: match 00000000/00000000 at 16 hash mask 000000ff at 16 The wish: 'tc filter del ...' command that removes only one specific filter (for example the 0a0a0a0a IP match (IP address 10.10.10.10)). Removal of some small subgroup would also be good - for example I could still recreate a bucket (bkt a) pretty fast. My attempts: I tried to number all the filters using prio, but with no help -- they just create something unusuable (but deletable) below, but the bucketed filters remain there after that gets deleted. Any ideas? edit - I'm adding a simplified tl;dr description of the problem: I created hash filter on some interfce just like in this http://lartc.org/howto/lartc.adv-filter.hashing.html I want to find a command that deletes one rule (e.g. 1.2.1.123) from the table, leaving the rest untouched and working.

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Procurve Primary VLAN

- by fukawi2

I'm trying to depreciate usage of VLAN 1 on my ProCurve switches; 1 is unused. I understand that VLAN 1 must exist, but I want to remove it from all ports, especially trunks between switches. The problem I have is that stacking does not seem to work without VLAN 1. I have changed the primary VLAN and management VLAN on all the switches: (config)# primary-vlan 42 (config)# management-vlan 42 (config)# no vlan 1 untagged 25 Port 25 is the link between the 2 switches I'm testing with; the stack master and a member switch; I only want tagged traffic between the switches, no untagged frames. show stacking on the master shows all members as "UP" but I can not telnet any of them: Telnet failed: Connection timed out. All switches have manually assigned (static) IP addresses on VLAN 42, and all exist in the same /25 subnet, as does my desktop. I can telnet the switches directly from my desktop to the individual switch IP addresses, just not from the master switch. Do I need to reboot the switches to have the primary-vlan change take effect? Or is there something else I'm missing?

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Microsoft Mouse and Keyboard Center Needed for Keyboard but Doesn't Support Mouse

- by eljay

I recently built a new computer (running Win7 Pro 64-bit) that includes the Microsoft Sidewinder X4 Keyboard. To make use of all the extra features of this keyboard I need the Mouse and Keyboard Center. I just ran Windows Update for the first time on this system and the Mouse and Keyboard Center was included in the update. I'm left-handed and before the update I had the mouse set up for lefty use. Now after the update, it's been set to righty use and the original mouse control panel applet no longer allows the assignment of buttons. For that there's a link to the Mouse and Keyboard Center which does not support my oldish mice. (I have an IntelliMouse Optical and a Creative Mouse Lite Pro.) So I need the new utility for my keyboard, but I have to be right-handed to use my mouse? Really! I tried changing HKCU\Control Panel\Mouse\SwapMouseButtons to 1, but a reboot set it back to 0. Is there some way I can change my mouse back to left-handed? Thanx -eljay

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unable to access Internet by wireless but can by cable

- by Jeff King

i'M GOING MAD! UNtil last friday I had been successfully using wifi with the supplier as VIRGIN through their Motorola SB 4200 cable Modem and the wireless router being the Linksys WRT 54G router. Supported were three lap tops and an EPSON 510W printer and this had been running with no issue for about 3 years. Back to last friday, we started suffering significant delays and then the network collapsed with no wireless access. I was able to connect a single laptop direct to the cable modem and internet access was restored to just that one device. I thought that the problem was the router so I tried a backup D-Link device with no success. I have subsequently bought another cable modem AND a netgear router plus addidtional ethernet cables but with no success. The best that happens is that the signal appears good but I cannot get access to the internet. A yellow question mark appears on the 'gradient' icon. Each laptop and router works elsewhere so I'm stumped. Mind you I am a real novice so I'm not surprised. Please can anyone tell me what I'm doing wrong?

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Is there a limit setting a php_admin_value in php-fpm?

- by PeeHaa

I am trying to set a large value in the configuration of a pool in php-fpm, but at some point it just doesn't start anymore. php_admin_value[disable_functions] = dl,exec,passthru,shell_exec,system,proc_open,popen,curl_exec,curl_multi_exec,parse_ini_file,show_source,pcntl_exec,include,include_once,require,require_once,posix_mkfifo,posix_getlogin,posix_ttyname,getenv,get_current_use,proc_get_status,get_cfg_va,disk_free_space,disk_total_space,diskfreespace,getcwd,getlastmo,getmygid,getmyinode,getmypid,getmyuid,ini_set,mail,proc_nice,proc_terminate,proc_close,pfsockopen,fsockopen,apache_child_terminate,posix_kill,posix_mkfifo,posix_setpgid,posix_setsid,posix_setuid,fopen,tmpfile,bzopen,gzopen,chgrp,chmod,chown,copy,file_put_contents,lchgrp,lchown,link,mkdi,move_uploaded_file,rename,rmdi,symlink,tempnam,touch,unlink,iptcembed,ftp_get,ftp_nb_get,file_exists,file_get_contents,file,fileatime,filectime,filegroup,fileinode,filemtime,fileowne,fileperms,filesize,filetype,glob,is_di,is_executable,is_file,is_link,is_readable,is_uploaded_file,is_writable,is_writeable,linkinfo,lstat,parse_ini_file,pathinfo,readfile,readlink,realpath,stat,gzfile,create_function When trying to restart php-fpm it fails with the following message: Stopping php-fpm: [ OK ] Starting php-fpm: [20-Oct-2013 22:31:52] ERROR: [/etc/php-fpm.d/codepad.conf:235] value is NULL for a ZEND_INI_PARSER_ENTRY [20-Oct-2013 22:31:52] ERROR: Unable to include /etc/php-fpm.d/codepad.conf from /etc/php-fpm.conf at line 235 [20-Oct-2013 22:31:52] ERROR: failed to load configuration file '/etc/php-fpm.conf' [20-Oct-2013 22:31:52] ERROR: FPM initialization failed [FAILED] When I remove the last disabled function (create_function) it start again. I also tried with other functions, but this gives the same error so it's not related to the create_function function. The string currently is just over 1KB in size so it looks like I have hit a limit here? Is my assumption correct? Is there a way to overcome this limit? I also tried to add another php_admin_value[disable_functions] underneath it (hoping it would be appended), but that didn't work (it just used the first one).

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XP/Intel wirelss only showing 'hpsetup' ad-hoc network that isn't there

- by ewall

Trying to help my friend with her work XP laptop, which recently stopped seeing any wireless SSIDs except the SSID 'hpsetup' (presumably from a wireless-enabled HP printer). Relevant information: The laptop is a Lenovo T500 (Centrino 2 chipset) with XP SP3. The network adapter is Intel WiFi Link 5300 AGN (built-in). The latest version (13.5) of the Intel drivers only are installed, not the Intel config software, so XP is using the Wireless Zero-Config manager. The wireless router is a NetGear WGR614 v7 with 802.11b/g. The SSID is broadcasting, and all the other laptops in the house can see and connect to it. On the laptop, I have tried repairing the network connection, disabling power management, turning off 802.11a & n radio, and more... but it didn't help. Some of the wireless settings are managed by Group Policy from her office (I get the "At least one of your changes was not applied successfully to your wireless configuration" message). It is enforced to connect to "Access point (infrastructure) networks only". The real kicker is that my laptop does not an SSID named 'hpsetup' here, but it can see several broadcasted SSIDs including the one we want, while my friend's laptop doesn't see any SSID except 'hpsetup'. Any suggestions?

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Google bots are severely affecting site performance

- by Lynn

I have an aggregate site on a linux server that pulls in feeds from a universe of about 2,000 blogs. It's in Wordpress 3.4.2 and I have a cron job that is staggered to run five times an hour on another server to pull in the stories and then publish them to the front page of this site. This is so I didn't put too much pressure all on one server. However, the Google bots, which visit a few times every hour bring the server to its knees in the morning and evenings when there is an increase in traffic on the site. The bots have something like 30,000 links to follow at this point. How do I throttle the bots to simply grab the new stories off the front page and stop there? EDIT- Details of my server configuration: The way we have this set up is the server that handles all the publishing is an unmanaged instance via AWS. It mounts the NFS server and connects to the RDS to update content, etc. You get to this publishing instance via a plugin that detects the wp-admin link and then redirects you into there. The front end app server also mounts the NFS and requests data from the RDS. It is the only one that has the WP Super Cache on it.... The OS is Ubuntu on the App server and the NFS runs CentOs. The front end is Nginx and the publishing server is Apache.

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Slowdown upon router/modem setup change

- by Ollie Saunders

I’ve been using a Belkin FSD7632-4 modem router to connect to my TalkTalk provided ADSL internet connection for some time and been pretty happy with it. Recently, however, the connection has been failing and I decided to get a ASUS RT-N16 instead, which is also a much more capable router generally. The ASUS RT-N16 doesn’t come with a modem built-in so I purchased as Zoom modem as well. I’ve set them both up and am using them to post this message. But I’m a bit miffed to find that I get a significantly and consistently slower downstream rate from the new configuration than with the old Belkin. Belkin modem router: downstream: 3.45 mbps upstream: 0.73 mbps ASUS router + Zoom modem: downstream: 2.71 mbps upstream: 0.66 mbps Any ideas why this is? The really weird thing about this is that the Zoom supports ADSL2 and ADSL2+ but I don’t think the old Belkin does. At first I thought it might be due to the Zoom modem being limited to PPPoE instead of PPPoA, which my ISP supports, but then I tried using PPPoE with the Belkin and that still gave a high speed. I’m using VC-Mux encapsulation with both. VPI of 0 and VCI of 38. I pulled this data off the Zoom: Mode: ADSL2 Line Coding: Trellis On Status: No Defect Link Power State: L0 Downstream Upstream SNR Margin (dB): 12.3 11.8 Attenuation (dB): 43.0 24.9 Output Power (dBm): 12.9 0.0 Attainable Rate (Kbps): 3936 844 Rate (Kbps): 3194 840 MSGc (number of bytes in overhead channel message): 59 10 B (number of bytes in Mux Data Frame): 99 14 M (number of Mux Data Frames in FEC Data Frame): 2 16 T (Mux Data Frames over sync bytes): 1 8 R (number of check bytes in FEC Data Frame): 8 8 S (ratio of FEC over PMD Data Frame length): 1.9833 9.0594 L (number of bits in PMD Data Frame): 839 219 D (interleaver depth): 32 2 Delay (msec): 15 4 Super Frames: 15808 14078 Super Frame Errors: 0 4294967232 RS Words: 513778 111753 RS Correctable Errors: 126 4294967238 RS Uncorrectable Errors: 0 N/A HEC Errors: 0 4294967279 OCD Errors: 0 0 LCD Errors: 0 0 Total Cells: 1920175 237597 Data Cells: 205993 392 Bit Errors: 0 0 Total ES: 0 0 Total SES: 0 0 Total UAS: 34 0

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What is causing ocassional white windows on my Mac?

- by user63333

Hello. I'm having a very strange problem with my Mac lately. When I'm working in an app and a new window pane or sheet is displayed, sometimes it comes up completely white. Once an app is having these problems, it will continue to bring up a blank screen for that particular window (although other windows work fine). After the app is relaunched, the window is fine again. What I'm noticing that's very strange is that although the interface turns completely white, the functions of the interface are still available. So I have to "navigate blindly" around the interface, until I can relaunch. This occurs throughout the operating system. Screenshots: This is what happened when I tried opening the File menu in Lightroom app. What happened to me on Lynda.com (in Firefox) after selecting the "Software..." dropdown. (All other dropdowns were fine. Reloading the page fixed it.) When I was decompressing a file, The Unarchiver launched and opened this white window. It still decompressed the file. This is what happened one time when I opened Finder (with TotalFinder) to my Downloads folder. This is something I've never seen before. This just started happening lately. What could be the problem? Thanks for your help. NOTE: since new users are not allowed to post images, just image blank white interface elements. And since new users also aren't allowed to post more than one link, here's the first screenshot:

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Why cache static files with Varnish, why not pass

- by Saif Bechan

I have a system runnning nginx / php-fpm / varnish / wordpress and amazon s3. Now I have looked at a lot of configuration files while setting up the system, and in all of them I found something like this: /* If the request is for pictures, javascript, css, etc */ if (req.url ~ "\.(jpg|jpeg|png|gif|css|js)$") { /* Remove the cookie and make the request static */ unset req.http.cookie; return (lookup); } I do not understand why this is done. Most of the examples also run NginX as a webserver. Now the question is, why would you use the varnish cache to cache these static files. It makes much more sense to me to only cache the dynamic files so that php-fpm / mysql don't get hit that much. Am I correct or am I missing something here? UPDATE I want to add some info to the question based on the answer given. If you have a dynamic website, where the content actually changes a lot, chaching does not make sense. But if you use WordPress for a static website for example, this can be cached for long periods of time. That said, more important to me is static conent. I have found a link with some test and benchmarks on different cache apps and webserver apps. http://nbonvin.wordpress.com/2011/03/14/apache-vs-nginx-vs-varnish-vs-gwan/ NginX is actually faster in getting your static content, so it makes more sense to just let it pass. NginX works great with static files. -- Apart from that, most of the time static content is not even in the webserver itself. Most of the time this content is stores on a CDN somewhere, maybe AWS S3, something like that. I think the varnish cache is the last place where you want to have you static content stored.

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sudo fdisk in a live session does not show all hard drives

- by cornbread

I am having Grub2 issues in my Ubuntu 10.04 dual boot, 2 hard drive system. So I am attempting to follow the standard grub2 reinstallation guide (cant post link because of spam filters allowing only one... ?_?) Don't know if this is the root of my problem, but my speedy internal HD with my OS on it is not showing up anywhere in a live session. Not in nautilus, behind fdisk.... no where. When I can get the main system to boot, there is no issue seeing all available partitions. But the live session sees only the 1TB internal media/backup hard drive. I need access to the other hard drive and it's partitions to finish the grub2 re-installation but I am not sure anymore that is the underlying issue. Anyone have experience with this? The issue I have identified as a grub2 issue is fully described here. SandPvvr describes it exactly. Some notes: I do not see the grub2 menu for my os's holding down the shift key after my bios screen works maybe 10% of the time Not related to reinstalling a windows os. havent been touched in a year do some web development. issue may have started when I was playing with ruby and django. not sure on this. Could a dev environment do this? fdisk in live session ubuntu@ubuntu:~$ sudo fdisk -l Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0001d518 Device Boot Start End Blocks Id System /dev/sdb2 1 121601 976759939 5 Extended /dev/sdb5 487 110765 885816036 83 Linux /dev/sdb6 110766 121601 87040138+ b W95 FAT32 /dev/sdb7 1 486 3903700+ 82 Linux swap / Solaris Partition table entries are not in disk order

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Setting up port forwarding for web server

- by Javier Badia

This could belong on Super User, but I thought this place was more appropiate. I want to run Apache in my computer and want to make it available to the outside world to test a couple things. Apparently, I have to go into my router's (a TP-LINK TD 8910G) settings and forward port 80 to my PC's IP. So far so good. Thing is, since the router uses a web based interface and it's kind of stupid, it told me that since I was using port 80 for this, I should access its settings through port 8080. Maybe it can't detect requests coming from the LAN, I don't know. Point is, now neither port can't access the configuration, and I can't access Internet. Specifically, trying to access anything (including 192.168.1.1, the router's settings) through port 80 turns up a blank page (maybe if I had the server running in my computer I'd get something, but I don't want to risk trying, I had to reset the router and restore the settings), and port 8080 gives a "Can't establish connection" error in Firefox (and similar ones in other browsers). Is there a way to configure the router to not redirect requests coming from inside the network? I'm a beginner with this stuff, so please try to explain in a simple way. If this is more appropiate in Super User, I'm sorry.

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Encrypted WiFi with no password?

- by Ian Boyd

Is there any standard that allows a WiFi connection to be encrypted, but not require a password? i know that (old, weak) WEP, and newer WPA/WPA2 require a password (i.e. shared secret). Meanwhile my own wireless connections are "open", and therefore unencrypted. There is no technical reason why i can't have an encrypted link that doesn't require the user to enter any password. Such technology exists today (see public key encryption and HTTPS). But does such a standard exist for WiFi? Note: i only want to protect communications, not limit internet access. i get the sense that no such standard exists (since i'm pretty capable with Google), but i'd like it confirmed. Claraification: i want to protect communcations, not limit internet access. That means users are not required to have a password (or its moral equivalent). This means users are not required: to know a password to know a passphrase to enter a CAPTCHA to draw a secret to have a key fob to know a PIN to use a pre-shared key have a pre-shared file to possess a certificate In other words: it has the same accessibility as before, but is now encrypted.

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Standards for documenting/designing infrastructure

- by Paul

We have a moderately complex solution for which we need to construct a production environment. There are around a dozen components (and here I'm using a definition of "component" which means "can fail independently of other components" - e.g. an Apache server, a Weblogic web app, an ftp server, an ejabberd server, etc). There are a number of weblogic web apps - and one thing we need to decide is how many weblogic containers to run these web apps in. The system needs to be highly available, and communications in and out of the system are typically secured by SSL Our datacentre team will handle things like VLAN design, racking, server specification and build. So the kinds of decisions we still need to make are: How to map components to physical servers (and weblogic containers) Identify all communication paths, ensure all are either resilient or there's an "upstream" comms path that is resilient, and failover of that depends on all single-points of failure "downstream". Decide where to terminate SSL (on load balancers, or on Apache servers, for instance). My question isn't really about how to make the decisions, but whether there are any standards for documenting (especially in diagrams) the design questions and the design decisions. It seems odd, for instance, that Visio doesn't have a template for something like this - it has templates for more physical layout, and for more logical /software architecture diagrams. So right now I'm using a basic Visio diagram to represent each component, the commms between them with plans to augment this with hostnames, ports, whether each comms link is resilient etc, etc. This all feels like something that must been done many times before. Are there standards for documenting this?

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Linux server: Dropped packets

- by Lars

I see dropped packets using ifconfig on my eth0 interface: eth0 Link encap:Ethernet HWaddr 00:15:17:0d:03:ca inet addr:10.0.1.2 Bcast:10.0.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1 RX packets:30268348 errors:0 dropped:70721 overruns:0 frame:0 TX packets:133076885 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8699434077 (8.6 GB) TX bytes:194937313025 (194.9 GB) Interrupt:16 Memory:feae0000-feb00000 When i use ethtool -S i dont see anything wrong: NIC statistics: rx_packets: 30267138 tx_packets: 133074510 rx_bytes: 8699356158 tx_bytes: 194934147340 rx_broadcast: 35296 tx_broadcast: 5435 rx_multicast: 0 tx_multicast: 0 rx_errors: 0 tx_errors: 0 tx_dropped: 0 multicast: 0 collisions: 0 rx_length_errors: 0 rx_over_errors: 0 rx_crc_errors: 0 rx_frame_errors: 0 rx_no_buffer_count: 0 rx_missed_errors: 0 tx_aborted_errors: 0 tx_carrier_errors: 0 tx_fifo_errors: 0 tx_heartbeat_errors: 0 tx_window_errors: 0 tx_abort_late_coll: 0 tx_deferred_ok: 0 tx_single_coll_ok: 0 tx_multi_coll_ok: 0 tx_timeout_count: 0 tx_restart_queue: 0 rx_long_length_errors: 0 rx_short_length_errors: 0 rx_align_errors: 0 tx_tcp_seg_good: 5757001 tx_tcp_seg_failed: 0 rx_flow_control_xon: 8649 rx_flow_control_xoff: 62072 tx_flow_control_xon: 0 tx_flow_control_xoff: 0 rx_long_byte_count: 8699356158 rx_csum_offload_good: 30212111 rx_csum_offload_errors: 0 rx_header_split: 10857552 alloc_rx_buff_failed: 0 tx_smbus: 0 rx_smbus: 0 dropped_smbus: 0 rx_dma_failed: 0 tx_dma_failed: 0 I am running Ubuntu 12.04 with kernel 3.2.0-30-generic #48-Ubuntu SMP I have pinged every device on my internal network for about 24 hours, without packet loss. Also checked my router and my interface to the WAN, also no errors there. Does anyone have any clue?

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