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  • Where should I go to learn about networking? [closed]

    - by Ollie Saunders
    I wonder if anyone could recommend resource or resources such as a good book that: explains how all the important protocols work and interact. I’m interested in those that are relevant in a typical home network and used over the Internet explains in detail how ADSL Internet connections work to the level of depth necessary so that I’m able to tweak and measure performance settings starts from the beginning but attempts to provide proper understanding rather than idiot-oriented steps to follow Basically, I’m interested in how these technologies work and tend to be implemented in hardware and software rather than “here’s what to do if…” I’m interested in Computer Networking by Andrew S. Tanenbaum and I wonder if anyone else has any experience with that title. It’s expensive but I could probably loan a copy for £3 from the library or so.

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  • How to configure machines in a public subnet with two gateways?

    - by Shtééf
    We have a single public /24 subnet, with a BGP router as the primary gateway. Now I'm interested in configuring a second router for redundancy. How do I deal with multiple gateways on the servers in our public subnet? I found some other questions related to multiple gateways that seem to deal with NAT set-ups. In my situation, the servers all have public routed IP-addresses. So from what I can tell, it doesn't really matter which route incoming or outgoing packets take. But I figure the servers need some way of telling when one of the gateways is down, and route around it? Is this accomplished with protocols such as OSPF? And do I need to deploy this on all my servers?

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  • Go/Obj-C style interfaces with ability to extend compiled objects after initial release

    - by Skrylar
    I have a conceptual model for an object system which involves combining Go/Obj-C interfaces/protocols with being able to add virtual methods from any unit, not just the one which defines a class. The idea of this is to allow Ruby-ish open classes so you can take a minimalist approach to library development, and attach on small pieces of functionality as is actually needed by the whole program. Implementation of this involves a table of methods marked virtual in an RTTI table, which system functions are allowed to add to during module initialization. Upon typecasting an object to an interface, a Go-style lookup is done to create a vtable for that particular mapping and pass it off so you can have comparable performance to C/C++. In this case, methods may be added /afterwards/ which were not previously known and these new methods allow newer interfaces to be satisfied; while I like this idea because it seems like it would be very flexible (disregarding the potential for spaghetti code, which can happen with just about any model you use regardless). By wrapping the system calls for binding methods up in a set of clean C-compatible calls, one would also be able to integrate code with shared libraries and retain a decent amount of performance (Go does not do shared linking, and Objective-C does a dynamic lookup on each call.) Is there a valid use-case for this model that would make it worth the extra background plumbing? As much as this Dylan-style extensibility would be nice to have access to, I can't quite bring myself to a use case that would justify the overhead other than "it could make some kinds of code more extensible in future scenarios."

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  • ArchBeat Link-o-Rama for October 18, 2013

    - by OTN ArchBeat
    Enriching XMLType data using relational data – XQuery and fn:collection in action | Lucas Jellema Another detailed technical post from the always prolific Lucas Jellema. Evil Behind ChangeEventPolicy PPR in CRUD ADF 12c and WebLogic Stuck Threads | Andrejus Baranovskis The latest post from Oracle ACE Director Andrejus Baranovskis is a bit of a preview of his presentation at the upcoming UKOUG 2013 event. Podcast: Interview with authors of "Hudson Continuous Integration in Practice" For your listening pleasure... Here's an Oracle Author Podcast Interview with "Hudson Continuous Integration in Practice" authors Ed Burns and Winston Prakash. Manual Recovery Mechanisms in SOA Suite and AIA | Shreenidhi Raghuram Solution architect Shreenidhi Raghuram's post combines information from several sources to provide "a quick reference for Manual Recovery of Faults within the SOA and AIA contexts." Event: Harnessing Oracle Weblogic and Oracle Coherence This OTN Virtual Developer Day event features eight sessions in two tracks, with presentations and hands-on labs for developers and architects delivered by experts in Weblogic, Coherence, and ADF. Registration is free. November 5th, 2013. 9am-1pm PT / 12pm-4pm ET / 1pm-5pm BRT Podcast: IoT Challenges and Opportunities - Part 2 Part 2 of the OTN ArchBeat Internet of Things podcast features a roundtable discussion of IoT challenges: massive data streams, security and privacy issues, evolving standards and protocols. Listen! Video: Design - ADF Architectural Patterns - Two for One Deal | Chris Muir Chris Muir explores the reuse of BTF workspaces across multiple applications and the advantages and disadvantages of reuse at the application level. Thought for the Day "Can't nothing make your life work if you ain't the architect." — Terry McMillan, American author (Born October 18, 1951) Source: brainyquote.com

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  • IM and File Transfers Integrated With VoIP

    - by Ehtyar
    I have an Asterisk box serving an office of people. I'd like to provide instant messaging and file sharing capabilities alongside the voice and video capabilities provided by Asterisk (ala Windows Live Messenger, Skype etc). Asterisk does not seem to offer IM outside the context of a SIP call, nor am I aware that it provides file transferring capabilities whatsoever. The clients will be using Jitsi, so there are many protocols to choose from, but I'd like to provide as much integration as possible between the VoIP and IM/file transfer (ideally a single account that facilitates voice/video and IM/file transfer). Is this possible, and if not, what would be the most appropriate alternative? Thank you.

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  • How do I establish the network sharing to my WinXP server network drive from my Mac notebook?

    - by mobibob
    I have been able to connect to my WinXP server's shared drives by using Finder's Command-K to browse the network. Unfortunately, when the server gets rebooted, the connection drops and sometimes I cannot get reconnected. I have specified different protocols (afp / cifs / smb) and different login names (connect as...) with limited success. Once I find the right combination, I am good for a few weeks. Once, it seems as though I had to unshared and shared the drive to get it to work. Unfortunately, it is very frustrating, so I try multiple things at one time, so when I finally get to the success point -- I honestly don't know what worked. I followed Mac help, surfed for instructions, issues, etc., but nothing appears to be consistent. I would love for this thread to be the ultimate answer for all time! Can anyone help me? If my description or question need more detail, please ask away!

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  • diagnostic software for wifi adapter

    - by Nathan Fellman
    I'm having trouble with my wifi connection. Is there any software out there that can help me determine if the problem is in the drivers or in the hardware? Regretfully, I'm working on Vista Edit: The problem I'm having is that the Vista reports that the wireless radio is connected, shows an IP and all, the router also shows that the computer is connected, but there's no connectivity. I can't logon to the router, and I can't even ping it. When I ping it I get the response: General Failure I have tried connecting with and without various wireless security protocols. I have tried disabling the wireless adapter and re-enabling it from the Device Manager I have tried updating the driver None of this has helped. When I connect via Ethernet (with a cable, that is), everything works fine. Edit: I'm not using any firewall on the computer, that I'm aware of. The IP address for the WIFI adapter is similar to the one for the LAN adapter. They differ by one.

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  • Digital HD Transition

    - by Bill Evjen
    The HD Experience Roughly 53% of the viewing public has HD capable devices in their home 24% think they are watching HD while they have no subscription to any HD content Today’s HD Considerations Choices abound: format resolution – 720p, 1080i/p frame rates compression and wrapping audio compression and delivery metadata packaging, delivery, and usage content delivery protocols Metadata is going to be a part of the overall experience With emerging technologies: Super Hi-Vision (SHV, UHDTV 4320p), 3D HEVC/H.265, WEBM/VP8 HDBaseT, P2PTV Dolby Pulse/HE-AAC Industry standardization Metadata registration, packaging, and delivery standards Improved picture and sound quality is a logical next step but we need to also think about the end to end viewing experience including; 3D video and audio content Mixed-mode viewing to bring interactive and immersive experiences Content Transportability both on-to and off-of the aircraft High Definition Standardization Analog switch off around the world DTV transition completed: 17 countries DTV transition in progress: 45 countries The EU has mandated the end of 2012 as the final date for Analog Switch Off D-Cinema was standardized by SMPTE in 2006 Airlines are installing HD displays today Passengers are bringing their own devices now HD TV on airlines are getting bigger and bigger – bigger than SD was – now up to 23” Gray scale data input for color – 6 to 8 bit Contrast – 400 to 700 Backlit – LED Encryption – can it be the same for HD? PPV in the cabin?

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  • How to configure ubuntu ldap client to get password policies from server?

    - by Rafaeldv
    I have a ldap server on CentOS, 389-ds. I configured the client, ubuntu 12.04, to authenticate on that base and it works very well. But it don't gets the password policies from server. For example, if i set the policy to force user to change the password on first login, ubuntu ignores it and logs him in, always. How can i setup the client to get the policies? Here are the client files: /etc/nsswitch.conf passwd: files ldap group: files ldap shadow: files ldap hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis sudoers: ldap files common-auth auth [success=2 default=ignore] pam_unix.so nullok_secure auth [success=1 default=ignore] pam_ldap.so use_first_pass auth requisite pam_deny.so auth required pam_permit.so auth optional pam_cap.so common-account account [success=2 new_authtok_reqd=done default=ignore] pam_unix.so account [success=1 default=ignore] pam_ldap.so account requisite pam_deny.so account required pam_permit.so common-password password requisite pam_cracklib.so retry=3 minlen=8 difok=3 password [success=2 default=ignore] pam_unix.so obscure use_authtok try_first_pass sha512 password [success=1 user_unknown=ignore default=die] pam_ldap.so use_authtok try_first_pass password requisite pam_deny.so password required pam_permit.so password optional pam_gnome_keyring.so common-session session [default=1] pam_permit.so session requisite pam_deny.so session required pam_permit.so session optional pam_umask.so session required pam_unix.so session optional pam_ldap.so session optional pam_ck_connector.so nox11 session optional pam_mkhomedir.so skel=/etc/skel umask=0022 /etc/ldap.conf base dc=a,dc=b,dc=c uri ldaps://a.b.c/ ldap_version 3 rootbinddn cn=directory manager pam_password md5 sudoers_base ou=SUDOers,dc=a,dc=b,dc=c pam_lookup_policy yes pam_check_host_attr yes nss_initgroups_ignoreusers avahi,avahi-autoipd,backup,bin,colord,daemon,games,gnats,hplip,irc,kernoops,libuuid,lightdm,list,lp,mail,man,messagebus,news,proxy,pulse,root,rtkit,saned,speech-dispatcher,sshd,sync,sys,syslog,usbmux,uucp,whoopsie,www-data /etc/ldap/ldap.conf BASE dc=a,dc=b,dc=c URI ldaps://a.b.c/ ssl on use_sasl no tls_checkpeer no sudoers_base ou=SUDOers,dc=a,dc=b,dc=c sudoers_debug 2 pam_lookup_policy yes pam_check_host_attr yes pam_lookup_policy yes pam_check_host_attr yes TLS_CACERT /etc/ssl/certs/ca-certificates.crt TLS_REQCERT never

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  • Video on demand streaming solution

    - by Rafal Saltarski
    we are looking into building a commercial vod service and I'm doing research on the subject. We need the video to be protected with DRM so users cant rip/copy (i realise its mostly useless but the lawyers demand it from us) and the server solution to be scalable and able to distrubute content in hd to a high number of clients. Besides, we would need to be able to develop a player integrated with the payment system, so users that havent bought access would for example only see the first 30 seconds of video and then have the playback interrupted, or only be able to watch video for 72h after payment. Also it would be nice if we could distribute video to mobile platforms like android/wp8/ios but thats not a priority at the moment. I have zero experience on that topic so I would greatly appreciate any feedback or giving me stuff to read about like protocols or key phrases i should know. Thanks

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  • What would be a good topic for research on "edge of multiple processors / computers programming" topic?

    - by Kabumbus
    This is a subjective discussion so we can express our dreams and hopes here. A "topic" must be like a task with point to have as end result a software poduct. A "topic" must be mainly about "Software engineering", "Algorithm and data structure concepts" and perhaps "Design patterns". I mean let us try to look what is not already there? What can be developed in fiew month and give a breakthrue / start a new leap / show somethig not realized before in science of f multiple computers programming? What i see is already there: LAN / wire and other infrastractural programms for connecting on device level MPI/ Bit torrent/Jabber protocols / APIs / servers for messaging on top Boost and analogs on evry OS in most languages for multithreading there are lots of CUDA like on computer frameworks for fast calculating on computers GPUs What I personally do not see out there is a crossplatform framework for multiple processes interaction. Meaning one that would allow easy creation of multyple processes running in paralell inside one hoster app on one machine. In level not harder than needed for threads creation (so no seprate server apps - just one lib doing it all) Is there ny such lib and what can you propose for research topic?

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  • Looking for internet traffic manager software for Windows 7

    - by Semyon Perepelitsa
    I have 128 KB/s (1 Mbit/s) internet connection. Not quite fast for downloading big files, but it is okay for internet browsing. When I start big file dowload, I cannot surf the web normally: pages appears slowly, especially pictures there. Therefore I pause downloading, but I'm regularly spending much time on reading articles or leaving the computer alone, when I can allow the file being dowloaded. Is there any software that can automize the process of pausing and resuming download or simply automatically regulate internet speed for each application using Internet? I download files using different software and protocols (Download Master for http, ftp; uTorrent for torrents; many other programs for updating themselves), so I don't want to be tied to particular program for downloading.

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  • UNC vs. SFTP vs. SSH for uploading to a Windows server

    - by apollodude217
    I understand that UNC, SFTP, and SSH are, of course, different interfaces (protocols?). But feature-wise, how do they differ? Are there things you can do with one that you cannot do with another? Is one more secure than another? The situation I want to fix is one where we have several Windows servers and VPC's, some of which have SFTP servers and some of which don't. For those that don't we use UNC over a VPN shared by the entire enterprise. What I want to do is either use all UNC, all SFTP, or all SSH (unless a real need to vary on a case-by-case basis presents itself). Links would be excellent. My biggest problem here is that my googling brings up irrelevant results. :(

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  • Server suddenly running out of entropy

    - by Creshal
    Since a reboot yesterday, one of our virtual servers (Debian Lenny, virtualized with Xen) is constantly running out of entropy, leading to timeouts etc. when trying to connect over SSH / TLS-enabled protocols. Is there any way to check which process(es) is(/are) eating up all the entropy? Edit: What I tried: Adding additional entropy sources: time_entropyd, rng-tools feeding urandom back into random, pseudorandom file accesses – netted about 1 MiB additional entropy per second, problems still persisted Checking for unusual activity via lsof, netstat and tcpdump – nothing. No noticeable load or anything Stopping daemons, restarting permanent sessions, rebooting the entire VM – no change in behaviour What in the end worked: Waiting. Since about yesterday noon, there are no connection problems anymore. Entropy is still somewhat low (128 Bytes peak), but TLS/SSH sessions have no noticeable delay anymore. I'm slowly switching our clients back to TLS (all five of them!), but I don't expect any change in behavior now.

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  • Cloud based backup solutions based on open standards?

    - by Rick
    I am looking for a solution to backup and consolidate important media from a couple Windows laptops and Mac laptop. I would like a solutions that based on open standards, so my data isn't trapped by proprietary formats and proprietary protocols. I would like the ability to switch clients or change providers in the future. For example, something like Jungle Disk plus S3 sounds like a great option. However, I am having trouble confirming how or if this can be setup meeting this criteria. Are there any real or de-facto standards for treating S3 as a filesystem? If so, what Windows and Mac clients support these standards?

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  • New SPC2 benchmark- The 7420 KILLS it !!!

    - by user12620172
    This is pretty sweet. The new SPC2 benchmark came out last week, and the 7420 not only came in 2nd of ALL speed scores, but came in #1 for price per MBPS. Check out this table. The 7420 score of 10,704 makes it really fast, but that's not the best part. The price one would have to pay in order to beat it is ridiculous. You can go see for yourself at http://www.storageperformance.org/results/benchmark_results_spc2The only system on the whole page that beats it was over twice the price per MBPS. Very sweet for Oracle. So let's see, the 7420 is the fastest per $. The 7420 is the cheapest per MBPS. The 7420 has incredible, built-in features, management services, analytics, and protocols. It's extremely stable and as a cluster has no single point of failure. It won the Storage Magazine award for best NAS system this year. So how long will it be before it's the number 1 NAS system in the market? What are the biggest hurdles still stopping the widespread adoption of the ZFSSA? From what I see, it's three things: 1. Administrator's comfort level with older legacy systems. 2. Politics 3. Past issues with Oracle Support.   I see all of these issues crop up regularly. Number 1 just takes time and education. Number 3 takes time with our new, better, and growing support team. many of them came from Oracle and there were growing pains when they went from a straight software-model to having to also support hardware. Number 2 is tricky, but it's the job of the sales teams to break through the internal politics and help their clients see the value in oracle hardware systems. Benchmarks like this will help.

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  • Why is apt-cache so slow?

    - by Damn Terminal
    After upgrade to Trusty (14.04) from Saucy (13.10), all apt operations are very slow. Even those that do not include downloading anything, or connecting to any servers. For example, displaying the apt policy # time apt-cache policy [...] real 0m8.951s user 0m5.069s sys 0m3.861s takes almost ten seconds! Mostly a weird lag right after issuing the command. And it's the same even if I issue the same command again. On another system it doesn't take a tenth of a second real 0m0.096s user 0m0.070s sys 0m0.023s The other system is a little beefier but there was no noticeable difference before the upgrade. It's the same with apt-get, anything apt-related. How do I find out the source of this lag and fix it? Additional info: # cat /etc/nsswitch.conf # /etc/nsswitch.conf # # Example configuration of GNU Name Service Switch functionality. # If you have the `glibc-doc-reference' and `info' packages installed, try: # `info libc "Name Service Switch"' for information about this file. passwd: compat group: compat shadow: compat hosts: files dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis BTW is my understanding of how apt-cache works correct? It doesn't make any network connections when I run apt-cache policy, right? In case I'm wrong and it matters, here are my sources https://gist.github.com/anonymous/02920270ff68e23fc3ec

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  • Problem accessing MICROSOFT##SSEE database (Error: 18456, Severity: 14, State: 16.)

    - by Philipp Schmid
    After an unexpected server shutdown due to a power failure, I can no longer connect to the internal windows database MICROSOFT##SSEE which is hosting Central Admin for my SBS 2008 server. The log shows: Error: 18456, Severity: 14, State: 16. Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. [CLIENT: <named pipe>] I've tried to connect using the SQL Management studio (connecting to .pipemssql$microsoft##sseesqlquery) but no luck. The SQL Server Configuration Manager doesn't show a entry for 'Protocols for MICROSOFT##SSEE' (but shows it for 2 other database hosted on the same SQL server 2005 Express edition. I have tried to restore the master.ldf and mastlog.log files from a backup, but the issue persists.

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  • How to Access an AWS Instance with RDC when behind a Private Subnet of a VPC

    - by dalej
    We are implementing a typical Amazon VPC with Public and Private Address - with all servers running the Windows platform. The MS SQL instances will be on the private subnet with all IIS/web servers on the public subnet. We have followed the detailed instructions at Scenario 2: VPC with Public and Private Subnets and everything works properly - until the point where you want to set up a Remote Desktop Connection into the SQL server(s) on the private subnet. At this point, the instructions assume you are accessing a server on the public subnet and it is not clear what is required to RDC to a server on a private subnet. It would make sense that some sort of port redirection is necessary - perhaps accessing the EIP of the Nat instance to hit a particular SQL server? Or perhaps use an Elastic Load Balancer (even though this is really for http protocols)? But it is not obvious what additional setup is required for such a Remote Desktop Connection?

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  • multicast and iptables

    - by Massimo
    I have secured a linux box, starting with iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP and after adding rules to enable specific protocols and streams. Which are the correct rules to add multicast support ? I am trying with these - for both client and server multicast : iptables -A INPUT -m pkttype --pkt-type multicast -j ACCEPT iptables -A OUTPUT -m pkttype --pkt-type multicast -j ACCEPT iptables -A INPUT --protocol igmp -j ACCEPT iptables -A OUTPUT --protocol igmp -j ACCEPT iptables -A INPUT --dst "224.0.0.0/4" -j ACCEPT iptables -A OUTPUT --dst "224.0.0.0/4" -j ACCEPT Linux 2.6.38-12 / iptables 1.4.10 Is there any internet service to test my multicast set ( pc + adsl router + provider ) ?

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  • Alternate Client for Cisco Unified Personal Communicator protocol

    - by Jason M
    At work we have an in-house chat system using CUPC. Does anyone else out there use this? There are a few things I do not like about this client: Where's the chat log? If I close the window, I have no way of getting my conversation back. Tabbed interface? That would be nice. I hate having multiple chat windows up, having to arrange them around my desktop as more people start talking to me. I don't like that I have to use this one-off application for particular this protocol when other chat clients will handle 99% of the other protocols I use. Tell me: Is the protocol an open standard for which other applications have support? (pidgin, adium, digsby, etc.) If not, can I overcome these issues from within CUPC? Perhaps there are newer versions of the client that overcome these issues.

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  • How to properly start gvfs without gnome?

    - by 9000
    I have a Debian testing box with Xfce (no Gnome, no Nautilus). It has all gvfs-related stuff installed, including all backends and fuse interface. But any attempts to gvfs-mount anything (like sftp://... or smb://...) fail with error opening file: Operation not supported, and gigolo shows only 'unix device (file)' in the list of supported protocols. My ~/.gvfs has rwx permissions, and I'm a member of fuse group; other fuse-related stuff works for me. What do I do? Where to look?

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  • Web Service Standard Complexity

    Are we over-standardizing web services and hindering their adoption? No, and in fact I feel that it is helping its adoption in the modern corporate world. Standards, although they can be daunting and tedious, provide a universal framework to which we all can operate in and around. These frameworks provide a common interface for all of to use when interaction with various computing environments so that data can be transfer freely.  Standards are protocols in which computers communicate with one another. If we take this to the living world, the united nations hires interprets for all each countries dignitaries so that they can understand what other countries are talking about. Imagine if the president of the United States wanted to talk to the ruler of China. How would these to communicate? The interpreter would translate data back and forth acting as in intermediary using both standard American English and Chinese. Without knowing the standards in either language no one would be able to communicate. Even though we work within the framework of standards does not mean that we are stuck with these standards. As technology evolves all standards will be out of touch, and when this occurs standards need to be refactored or replaced with new standards that are current with the technology at that time. How else are we as developers and the technology going to grow? What do you guys think?

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  • How to use radiusclient-ng?

    - by Muhammad Gelbana
    A guy on my team compiled the radiusclient and radlogin executable found on that page. But installing it is getting more and more problematic and I can't seem to get anywhere ! I received from him: radclient libfreeradius-client.so.2 servers radiusclient.conf dictionary.dat radlogin What I'm trying to do is to install this client on a linux box and the: Access that box remotely using ssh. Then issue a authentication\accounting requests to another remote RADIUS server. But nothing seems intuitive about this and I have very little experience with linux and RADIUS protocols ! Has anyone successfully installed that client ? Thank you.

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  • Websocket handshake response not forwarded from TCP to client

    - by Saharsh
    I am trying to create a websocket server. I can see the websocket client's opening handhshake. My response to it is received by the client laptop (I can see this on wireshark). So the TCP connection has been established. But the client (a chrome websocket client extension) does not receive the handshake packet. What could be a possible reason for TCP to not forward the handshake to the client or for the client to not be able to read the TCP message? Client handshake: GET HTTP/1.1 Upgrade: websocket Connection:Upgrade Cache-Control:no-cache Host:192.168.0.101 Origin:http://www.websocket.org Pragma:no-cache Sec-WebSocket-Extensions:permessage-deflate; client_max_window_bits, x-webkit-deflate-frame Sec-WebSocket-Key: qrmw/m+BoZije6h9HYKmVw== Sec-WebSocket-Version:13 Upgrade:websocket Server Response: HTTP/1.1 101 Switching Protocols Upgrade: websocket Connection: Upgrade Sec-WebSocket-Accept: jj1g5Io57m9ks8cme3jkbyo2asc= Access-Control-Allow-Origin: http://www.websocket.org Server: xyz Sec-WebSocket-Extensions: Thanks!

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