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• I just ordered 70/10 line, and need a new router I think?

  - by data_jepp

  Before I had the 25/5 line and the n standard router did just fine. Now it doesn't do the job. Online speedtest reads at 82 so I have the line. But my laptop is getting less than 30 in my room. My laptop has the following WiFi card: http://www.intel.com/content/www/us/en/wireless-products/centrino-advanced-n-6205.html What is this talk about 2,5 and 5ghz? Can my laptop be connected at once over both bandwidths? And that would let me use the full 70Mb over wifi? Hope it's ok to ask network questions here.

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• Suddely internet is not accessible

  - by user189708

  I am going crazy here. One day everything was working fine. I turned pc off and went to sleep. Next day turn pc on and cannot access internet (from any browser). The situation is: I cannot open any webpage from browser (tried Firefox and Epiphany) and cannot receive emails in thunderbird. BUT if I run firefox from console as sudo, I can use it as usual. I can access Skype and pretty much any other network stuff (like installing software with apt-get etc.), also if I use Astrill VPN software I can access webpages even running without sudo. I haven't install any software or anything like that for several days = I have not a clue what could cause this. Just by the way, other Win PC in our home has no issue. Here is what I have tried to fix this: I have tried to restart my pc, router, modem - multiple times I have tried to change permissions to my firefox profile I have tried to completely re-install firefox and start with blank profile, thus no addons I have tried to change /etc/resolv.conf to an IP of my router (it was 127.0.1.1) I have tried to change my hostname (from tomino-NB to tominoNB) I think I might try even more stuff. None of it works. Can someone please try to help me. Thank you UPDATE 1: I have tried this: Removing resolv.conf - Didn't help Also "ping" and "dig" commands cannot resolve host UPDATE 2: I have tried to edit nameservers in resolv.conf but still no effect. I can ping router as well as I can ping outside IP. So definitely just some DNS issue. Is it possible that something is rewriting path to resolv.conf and using different file? UPDATE 3: I have just restarted PC and everything works now... resolv.conf went back to nameserver 127.0.1.1 . I have no clue what happened that it works again...

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• Recommened design pattern to handle multiple compression algorithms for a class hierarchy

  - by sgorozco

  For all you OOD experts. What would be the recommended way to model the following scenario? I have a certain class hierarchy similar to the following one: class Base { ... } class Derived1 : Base { ... } class Derived2 : Base { ... } ... Next, I would like to implement different compression/decompression engines for this hierarchy. (I already have code for several strategies that best handle different cases, like file compression, network stream compression, legacy system compression, etc.) I would like the compression strategy to be pluggable and chosen at runtime, however I'm not sure how to handle the class hierarchy. Currently I have a tighly-coupled design that looks like this: interface ICompressor { byte[] Compress(Base instance); } class Strategy1Compressor : ICompressor { byte[] Compress(Base instance) { // Common compression guts for Base class ... // if( instance is Derived1 ) { // Compression guts for Derived1 class } if( instance is Derived2 ) { // Compression guts for Derived2 class } // Additional compression logic to handle other class derivations ... } } As it is, whenever I add a new derived class inheriting from Base, I would have to modify all compression strategies to take into account this new class. Is there a design pattern that allows me to decouple this, and allow me to easily introduce more classes to the Base hierarchy and/or additional compression strategies?

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• Why times elapsed connecting to a server are different?

  - by user1634619

  I have a small program which connects to a server of my choice and measures the time elapsed to do so. Each time I run it it returns different result. My question is what does this time depend on ? Network congestion for one. If I choose a server that has multiple addresses e.g. google.com the length of physical link may differ from time to time ? Is it safe to assume that it also affects connection time ? Are there any other factors in place ?

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• Fedora vs Ubuntu vs Debian to host Subversion and Bugzilla over Apache

  - by Tone

  I'm not interested in a flame war of Ubuntu vs Fedora vs Debian vs whatever. What I am interested in is whether or not I should move my current Ubuntu server to Fedora or Debian. I have been able to get Subversion setup and hosted via Apache over https and it works quite well (I'm a .NET guy so this was all new to me). I'm having trouble though with installing Bugszilla - have run into some issues getting all the perl scripts to run successfully so my questions are: 1) Will Bugszilla will install easier on Fedora or Debian? Can I just install a package instead of having to download the tar.gz file and untar it, run perl scripts, etc. 2) Is Fedora or Debian considered to be a better production server system? I have no desire for a GUI, just need it to host Subversion, Bugzilla over Apache2, and act as a file and print server for my home network.

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• ZFS: RAIDZ versus stripe with ditto blocks

  - by RandomInsano

  I'm going to build a ZFS file server from FreeBSD. I learned recently that I can't expand a RAIDZ udev once it's part of the pool. That's a problem since I'm a home user and will probably add one disk a year tops. But what if I set copies=3 against my entire pool and just throw individual drives into the pool separated? I've read somewheres that the copies will try and distribute across drives if possible. Is there a guarantee there? I really just want protection from bit rot and drive failure on the cheap. Speed's not an issue since it'll go over a 1Gb network and at MOST stream 720p podcasts. Would my data be guaranteed safe from a single drive failure? Are there things I'm not considering? Any and all input is appreciated.

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• SMTP server problem

  - by ram

  Hi, Our requirement is to send weekly newsletters to our website customers. For which we wanted to have local hosted SMTP server in our office. We are not using SMTP server provided by website hosting provider, as we wanted to reduce the network traffic and avoid IP blocking due to bulk mails. We are sending newsletters on weekly basis from our local SMTP server. But due to some reasons, some emails are going to spam and some are not reaching to customers and sometimes there are bounce messages to follow bulk email guidelines (mainly from Gmail). Can you please suggest me, how to achieve my problem. I also wanted to know what type of technology generally Linkedin or banks uses to send notifications emails to all its customers. When they send bulk emails, they will always reach inbox with out any problem. I want the same solution to implement for my website. Please suggest me. Thank you very much in advance.

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• Netgear WNR1000 WiFi speed

  - by Kamil Klimek

  I have Netgear WNR1000 150N, Macbook Pro 13" with Broadcom BCM43xx 1.0, Network connection 60mbps When I connect through the cable I easily get around 60mbps. When I go through the WiFi it's capable to get only 32mbps at tops. Any ideas why is that? Is that my router limitation or maybe my WiFi card? If it is routers fault what router would you suggest. Best router would be with usb port for external hard drive. Forgot to add screenshot with connection details: Szybkosc transmisji == Transmission speed

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• DNS on Redhat - rdnc: no server specified and no default

  - by Syahmul Aziz

  Hi all. The error as shown in the 2 pictures below: The configurations for named.conf and the zones files as shown below: After applying "alveso" suggestion below. Now, I think there is no error but I still can't ping my own domain www.p0864868.com (10.0.0.1) nor can I do host or nslookup as shown on previous pictures. PLease assist. Thank you in advance. I also attached my the changes that I made to my named.conf as well as my resolve.conf configs as shown below: progress 2: turned on logging by typping "rndc queylog" The output as below when I pinged p0864868.com progress 3: changed permission of 10-0-0.zone and p086868.zone to 644 named:named Still can't ping www.p0864868.com or execute host command. It says something like network unreachable. I don't understand why it refer to I don't what address is that.

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• replacing 3 Cisco Catalyst 4500

  - by hoberion

  Our network supplier recommends replacing our 3 cisco catalyst 4500's because they are EOL and dont speak OSPF (which we really want) Its not my area of expertise so I cant say for sure if we really need to replace these units but for my company the estimated costs of 250K euro is a huge problem. Is there any way to cut down on costs (without moving from cisco devices), I heard the 4500´s can speak ospf but would need an upgrade of sorts? edit: version: IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-I9K91S-M), Version 12.2(20)EW, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1) supervisor: WS-X4013+ Cisco Catalyst 4500 Series Supervisor Engine II-Plus density: WS-X4306-GB Cisco Catalyst 4500 Gigabit Ethernet Module, 6 Ports (GBIC) WS-X4306-GB Cisco Catalyst 4500 Gigabit Ethernet Module, 6 Ports (GBIC) WS-X4548-GB-RJ45 Cisco Catalyst 4500 Enhanced 48-Port 10/100/1000 Module (RJ-45) WS-X4548-GB-RJ45 Cisco Catalyst 4500 Enhanced 48-Port 10/100/1000 Module (RJ-45) WS-X4548-GB-RJ45 Cisco Catalyst 4500 Enhanced 48-Port 10/100/1000 Module (RJ-45)

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• Fedora vs Ubuntu to host Subversion and Bugszilla over Apache

  - by Tone

  I'm not interested in a flame war of Ubuntu vs Fedora vs whatever. What I am interested in is whether or not I should move my current Ubuntu server to Fedora. I have been able to get Subversion setup and hosted via Apache over https and it works quite well (I'm a .NET guy so this was all new to me). I'm having trouble though with installing Bugszilla - have run into some issues getting all the perl scripts to run successfully so my questions are: 1) Will Bugszilla will install easier on Fedora? Can I just install a package instead of having to download the tar.gz file and untar it, run perl scripts, etc. 2) Is Fedora considered to be a better production server system? I have no desire for a GUI, just need it to host Subversion, Bugzilla over Apache2, and act as a file and print server for my home network.

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• Who are the SOA experts? Specialization recognized by customers

  - by Jürgen Kress

  You are looking for the SOA experts to deliver an successful project - contact our Oracle SOA Specialized partners - you can recognize them by the logo, the plaques and in the solutions catalog: Plaques SOA Specialized We would like to offer you a nice SOA Specialization plaque  with your logo to proof your success. If you are a SOA Specialized partner and would like to request the plaque please send Brigitte an e-mail with the following information: Partner Name Partner logo (preferred eps file) Partner Status gold or platinum We recommend to mount the plaque at your office reception in addition you can use the SOA Specialization logos at your website Download Logo: Gold & Platinum Solutions Catalog Please make sure that your Oracle Partner Network administrator will add your achieved Specializations to the Oracle Solutions catalog We started to promote at our website www.oracle.com/soa the find a Specialized Partner who added their Service Oriented Architecture Specialization in the solutions catalog. For administration please visit manage solutions catalog within OPN For detailed tutorial and an faq please visit. http://tinyurl.com/Catalogorcl   For more information on SOA Specialization and special SOA please make sure that you read the SOA & Application Grid Specialization Guide and the SOA & Application Grid Specialization Checklist. Blog Twitter LinkedIn Mix Forum Wiki Website Technorati Tags: SOA Sepecialization,OPN,Oracle,SOA,Jürgen Kress,plaques,solutions catalog

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• SQL SERVER AGENT CAN NOT START

  - by Keith Ph?m

  http://imageshack.us/photo/my-images/819/sqlserveragent3.png/ http://imageshack.us/photo/my-images/341/sqlserveragent.png/ I still can not start SQL server agent . When Sql server agent just starts and stop immedietly .I don't know what's happening in the middle .. I already login by the Network Service account in configuration tools and assign member role in msmb database for SQL Server agent. Pls give me an advice I use win 7 ultimate , sql server 2008: Microsoft SQL Server Management Studio 10.0.1600.22 ((SQL_PreRelease).080709-1414 ) Microsoft Data Access Components (MDAC) 6.1.7600.16385 (win7_rtm.090713-1255) Microsoft MSXML 3.0 4.0 5.0 6.0 Microsoft Internet Explorer 9.0.8112.16421 Microsoft .NET Framework 2.0.50727.4971 Operating System 6.1.7600 Thanks

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• iptables: limiting bytes downloaded per IP per day?

  - by Miles

  On a public-facing web server, I'd like to limit the total bytes downloaded per IP address per day. For example, after a visitor downloaded 100MB, any additional requests would be dropped or rejected for the next 24 hours. Is it possible to accomplish this using iptables alone? The connbytes, connlimit, hashlimit, quota, and recent options all look promising, but the man page plays its cards close to the vest (e.g., "quota - Implements network quotas by decrementing a byte counter with each packet. --quota bytes The quota in bytes."). Would like to avoid using a proxy (like Squid) if possible.

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• How to know currently open ports on the Windows Firewall?

  - by QIU Quan

  On Windows XP and Windows Server 2003, I can know currently open ports on the Windows Firewall using the following command: netsh firewall show state However, on Windows 7 and Hyper-V Server 2008 R2, when I give that command, it says: No ports are currently open on all network interfaces. IMPORTANT: Command executed successfully. However, "netsh firewall" is deprecated; use "netsh advfirewall firewall" instead. Apparently there are ports open because services such as NetBIOS NS, Remote Desktop, and Hyper-V remote administration are functioning. I tried a few 'netsh advfirewall' show commands, but didn't get a way to find out which ports are permit by Windows Firewall. Knowing the currently open ports, I can be sure that I'm permitting necessary and sufficient traffic to pass in, no more, no less. Going through the whole set of advanced firewall rules is so tedious and error-prone. Is there a command on Windows 7 and Windows Server 2008 to do this efficiently?

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• System Monitoring Redundancy

  - by Josh Brower

  I consult in a small business environment where I have two HyperV hosts (with <10 VMs) + a couple other servers. I recently had an issue where one of the HyperV hosts had a CPU issue and it came down, bringing most of my non-critical VMs with it, plus a free piece of software that I use for network & system monitoring and availability. Because of this, and the fact that iDRAC locked up to, I did not get any alerts about the crash. So I am wondering how I can (cheaply) get a redundant availability monitoring system in place--Is is as simple as running Nagios or Zenoss (or whatever) on two different HyperV hosts? It just seems like running more than one copy of Nagios/Zenoss/etc could be expensive and have high overhead. Thoughts? Thanks! -Josh

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• DNS failover across multiple datacenters?

  - by Jae Lee

  I've got a site that is starting to get a lot of traffic and just the other day, we had a network outage at the datacenter where our loadbalancer (haproxy) is hosted at. This worried me as despite all my efforts of making the system fully redundant, I still could not make our DNS redundant, which I think isn't an easy solution. Only thing I was able to find was to sign up for DNS failover from places like dnsme, etc .... but they cost too much for budding startups. Even their Corporate plan only gives you 50 million queries per month and we use that up in a week. So my question is, are there any self hosted DNS we can do that provides the failover like how dnsme does it?

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• MS SQL 2000 and SSL Certificate

  - by smoak

  I'm trying to set up a MS SQL 2000 server to use an already existing SSL certificate installed on the server. I verified that the certificate shows up in the Personal/Certificate folder of the account that is running the MSSQLSERVER service using the Certificate MMC snap-in. I also verified that the certificate for the CA is installed under the Trusted Root Certificate Authorities. Additionally, to make sure that it is using this specific certificate I created a Certificate registry value of type REG_BINARY in: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer\MSSQLServer\SuperSocketNetLib and I set it to the certificates thumbprint like it mentions in: http://support.microsoft.com/kb/276553 Finally, I opened up the Server Network Utility, checked Force protocol encryption, clicked OK, and restarted the MSSQLSERVER service. Unfortunately, it fails to start and looking at the event log it's failing with: 19015: Encryption requested but no valid certificate was found. SQL Server terminating. I'm at a loss. Any ideas? Where did I go wrong?

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• Can I ping via an arbitrary interface of a DD-WRT system?

  - by bytebuster

  There's a Linksys WRT54GL router with DD-WRT firmware (v23SP2). The network has a simple dual-WAN configuration (standby mode, switching by a script): ~ # ip route 192.168.3.0/24 dev br0 proto kernel scope link src 192.168.3.1 192.168.2.0/24 dev vlan2 proto kernel scope link src 192.168.2.2 192.168.1.0/24 dev vlan1 proto kernel scope link src 192.168.1.67 127.0.0.0/8 dev lo scope link default via 192.168.2.1 dev vlan2 I'm trying to ping a certain server arbitrary via vlan1 or vlan2. What I tried, as suggested here: ping -I vlan2 <address> ping 192.168.2.1 <address> In both cases ping simply exits with no error messages. Also, ping ignores many other parameters, again, by exiting silently. I failed to find any references that DD-WRT has a limited version of ping whatsoever. I also don't think it can be a permissions issue as mentioned here since the only user with DD-WRT is root. What's wrong?

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• Block P2P traffic on a Linksys router WRT54G with Tomato firmware

  - by Kami

  I'm running a small wireless network (6 to 10 users) on a Linksys WRT54G with Tomato firmware sharing an Internet connection. I don't want the users to download files with BitTorrent (mainly used) and other P2P apps. I've also found some solutions about lowering P2P traffic priority using QoS. I really need to ban P2P traffic. Does anyone know how to setup some rules to deny that kind of traffic? I've tried to setup an Access Restriction Rule: However it's not working at all.

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• Why is my Wifi connection slower than ethernet even though bandwidth should saturated?

  - by supercheetah

  I'm wondering why it is that my wireless connection is slower than my wired connection for things going to the outside world (so, not files being transferred within the network), which is should be faster than the outside connection, which, I would think, would mean that downloading something like an ISO or other large file from the Internet should be the same either way since that should saturate the connection anyway. Does it have something to do with the encryption (WPA)? Could it have something to do with MTU since the MTU for ethernet can be in the range of 1500 to 9000 bytes, and 2304 bytes for 802.11? Do wireless packets have to be buffered, whereas this wouldn't be an issue with ethernet? What's the math behind the difference?

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• RAID Read/Write Speed Gradually Slows

  - by Nalandial

  This is actually a server at home, but I felt it was sufficiently complicated as to not have it on SuperUser and could easily apply to a professional situation. I have a file server running Debian (Lenny 5.0.4), and it has an XFS LVM on top of a RAID 5 with the OS drive separate from the RAID. It's also running apache, samba, and postgresql. Side note: before anyone asks, I'm using RAID5 because I get more bang for the buck on raw drive space, and still have some fault tolerance. When the box is started (via shutdown or reboot) reading/writing to it's samba share maxes out the gigabit network connection. Over time, this slowly degrades eventually becoming < 10MB/s; however, when rebooted the speed returns to maxing out the connection. Why is this happening, and is there a way to 'clear' out whatever's causing it without taking the server down? Thanks in advance!

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• Can't Start ISC DHCP IPv6 Server

  - by MrDaniel

  Trying to enable the ISC DHCP server for just IPv6 on Ubuntu 12.04 LTS. I have downloaded and installed the DHCP server via the following command: $ sudo apt-get install isc-dhcp-server Then I have followed the instructions in the following resources, Ubuntu Wiki DHCPv6, SixXS - Configuring ISC DHCPv6 Server and Linux IPv6 HOWTO - Configuration of the ISC DHCP server for IPv6 . So from review all those resources it seems like I need to: set a static IPv6 address for the Interface I want to run the DHCPv6 server from that is part of the IPv6 network subnet outside the DHCP range. Edit the /etc/dhcp/dhcpd6.conf file to configure the DHCPv6 range etc. Create the /var/lib/dhcp/dhcpd6.leases Manually start the DHCPv6 server. Setting the Static IP for eth0 $ sudo ifconfig eth0 inet6 add 2001:db8:0:1::128/64 My dhcpd6.conf default-lease-time 600; max-lease-time 7200; log-facility local7; subnet6 2001:db8:0:1::/64 { #Range for clients range6 2001:db8:0:1::129 2001:db8:0:1::254; } Created the dhcpd6.leases file As indicated in the dhcpd.leases man page. $ touch /var/lib/dhcp/dhcpd6.leases #Tried with sudo as well Manually starting the DHCPv6 server. Attempted to start the server using the following command: $ sudo dhcp -6 -f -cf /etc/dhcp/dhcpd6.conf eth0 The problem, the DHCP will not start, with an append error for the dhcpd6.leases file as indicated below when running the manual start command noted above. Can't open /var/lib/dhcp/dhcpd6.leases for append. Any ideas what I might be missing?

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• DPKG errors after upgrade to 12.10

  - by James Wulfe

  So I was doing fine then i upgraded my system to 12.10 and now i cant get my system to update all of its packages properly. no matter what i do, cleaning apt cache, manual install using dpkg, etc, i just cant get them to install. what is happening here and how do i fix this. if i would have thought 12.10 would be this much of a hassle i would have never upgraded..... here is a sampling of the code that returns from "apt-get -f install" Preparing to replace usb-modeswitch-data 20120120-0ubuntu1 (using .../usb-modeswitch-data_20120815-1_all.deb) ... /var/lib/dpkg/info/usb-modeswitch-data.prerm: 4: /var/lib/dpkg/info/usb-modeswitch-data.prerm: dpkg-maintscript-helper: Input/output error dpkg: warning: subprocess old pre-removal script returned error exit status 2 dpkg: trying script from the new package instead ... /var/lib/dpkg/tmp.ci/prerm: 4: /var/lib/dpkg/tmp.ci/prerm: dpkg-maintscript-helper: Input/output error dpkg: error processing /var/cache/apt/archives/usb-modeswitch-data_20120815-1_all.deb (--unpack): subprocess new pre-removal script returned error exit status 2 /var/lib/dpkg/info/usb-modeswitch-data.postinst: 7: /var/lib/dpkg/info/usb-modeswitch-data.postinst: dpkg-maintscript-helper: Input/output error dpkg: error while cleaning up: subprocess installed post-installation script returned error exit status 2 Errors were encountered while processing: /var/cache/apt/archives/network-manager_0.9.6.0-0ubuntu7_i386.deb /var/cache/apt/archives/pcmciautils_018-8_i386.deb /var/cache/apt/archives/unity-common_6.10.0-0ubuntu2_all.deb /var/cache/apt/archives/whoopsie_0.2.7_i386.deb /var/cache/apt/archives/usb-modeswitch_1.2.3+repack0-1ubuntu3_i386.deb /var/cache/apt/archives/usb-modeswitch-data_20120815-1_all.deb E: Sub-process /usr/bin/dpkg returned an error code (1) It is also just these 6 packages only. no other packages have given me this kind of trouble. well i should say as of now. It was just 5, but them i got an update for unity, and now unity-common is added to the trouble makers. which prevents me from further upgrading the actual unity package as this package is a dependancy.....

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• OSX Parallels 5 - can't share internet connection when using host-only networking...

  - by Steve Kirtley

  I've just upgraded from Parallels 3 to Parallels 5, but am having a problem matching my previous configuration. I am a web developer so run a local web server on my mac. I used to allow access to this from the virtual machines in Parallels by using 'Host-Only Networking' and then in OSX enabling internet sharing from my wifi/ethernet to the virtual ethernet ports that Parallels created. The setup was based on: http://www.craigfrancis.co.uk/features/setup/parallels/ The new version of Parallels doesn't create any network adaptors that are available for internet sharing in OSX - just VNIC's which only show under an ifconfig... Can anyone suggest how to make this all play nice? Thanks in advance! Steve

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