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  • Looking for a fiber optic "switch" or "router" for home use

    - by Shrout1
    The gist of my question: What is a "fiber optic" switch called? I.E. a layer 2 ethernet switch that uses fiber TX and RX connections and sends layer 2 network traffic between the fiber strands that are connected. Can someone purchase a dedicated fiber switch that does not have copper ethernet ports? What is the current average price of a device like this? Not necessarily looking for product endorsements, just information Might not make sense to go this route if it is too cost prohibitive What type of fiber connector is used for terminating a fiber strand into a jack on the wall? Can fiber be "patched" using two jacks and a "patch" cable? Is signal loss a concern with the longest runs at 100-200ft, a patch cable and media converters? The full story: My parents had unterminated fiber optic cable and terminated Cat5e run throughout their home when it was built in 2004. 10 years later the Cat5e isn't providing the throughput that my father needs to accomplish multiple streams of HD and fast system backups throughout the house. He can't reach gigabit speeds across the distance of the Cat5e runs. We are both interested in terminating the fiber connections and using them as high speed "backbones" to copper switches in each room of the house. It would be easy to attain gigabit speeds (or better, eventually) using the fiber. I have searched and searched for a "fiber optic switch" or "fiber optic router" and cannot find the correct term to describe this piece of hardware. We can use fiber media converters at the end points of each connection, however it would be nice to have a "patch panel" set up in the network closet in the basement that has fiber connections on it and switches the ethernet streams between the connections/systems in the house. Each fiber media converter costs between $50-$100 a piece... After 10 or so terminated connections it might make sense to find a piece of hardware that does not require media converters. That would depend upon the cost of this hardware Somewhat unrelated, if we are able to route between these fiber strands successfully, what is the physical connector type used in a jack on the wall? Just like RJ45 has a wall outlet (depicted below): What is the fiber optic equivalent of this? In the interim could we "patch" a couple fiber strands together in the network closet? Would signal loss be of concern with a run length of 100-200 feet, a patch cable and two media converters? If that would work then it could be used until the funds are available for more.

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  • Can I make my Linksys WAG200G as an access point?

    - by Adnan Badar
    I have two routers one is dsl router (connected through my fone line) second is Linksys WAG200G, i want to use this router as an access point to increase the signal strength in my neighborhood can anyone please guide me step by step as i am not that good in networking i need to know both ways one by connecting a cable from the first router to the second and then make access point to the second one. second by connecting wireless from the first router to the second and then make access point to the second one. Thanks. Adnan

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  • postfix error: open database /var/lib/mailman/data/aliases.db: No such file

    - by Thufir
    In trying to follow the Ubuntu guide for postfix and mailman, I do not understand these directions: This build of mailman runs as list. It must have permission to read /etc/aliases and read and write /var/lib/mailman/data/aliases. Do this with these commands: sudo chown root:list /var/lib/mailman/data/aliases sudo chown root:list /etc/aliases Save and run: sudo newaliases I'm getting this kind of error: root@dur:~# root@dur:~# root@dur:~# telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 dur.bounceme.net ESMTP Postfix (Ubuntu) ehlo dur 250-dur.bounceme.net 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN quit 221 2.0.0 Bye Connection closed by foreign host. root@dur:~# root@dur:~# tail /var/log/mail.log Aug 28 01:16:43 dur postfix/master[19444]: terminating on signal 15 Aug 28 01:16:43 dur postfix/postfix-script[19558]: starting the Postfix mail system Aug 28 01:16:43 dur postfix/master[19559]: daemon started -- version 2.9.1, configuration /etc/postfix Aug 28 01:16:45 dur postfix/postfix-script[19568]: stopping the Postfix mail system Aug 28 01:16:45 dur postfix/master[19559]: terminating on signal 15 Aug 28 01:16:45 dur postfix/postfix-script[19673]: starting the Postfix mail system Aug 28 01:16:45 dur postfix/master[19674]: daemon started -- version 2.9.1, configuration /etc/postfix Aug 28 01:17:22 dur postfix/smtpd[19709]: error: open database /var/lib/mailman/data/aliases.db: No such file or directory Aug 28 01:17:22 dur postfix/smtpd[19709]: connect from localhost[127.0.0.1] Aug 28 01:18:37 dur postfix/smtpd[19709]: disconnect from localhost[127.0.0.1] root@dur:~# root@dur:~# postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix default_transport = smtp home_mailbox = Maildir/ inet_interfaces = loopback-only mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -m "${EXTENSION}" mailbox_size_limit = 0 mailman_destination_recipient_limit = 1 mydestination = dur, dur.bounceme.net, localhost.bounceme.net, localhost myhostname = dur.bounceme.net mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 readme_directory = no recipient_delimiter = + relay_domains = lists.dur.bounceme.net relay_transport = relay relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/dovecot-auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/ssl/certs/ssl-mail.pem smtpd_tls_key_file = /etc/ssl/private/ssl-mail.key smtpd_tls_mandatory_ciphers = medium smtpd_tls_mandatory_protocols = SSLv3, TLSv1 smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport root@dur:~# root@dur:~# And am wondering what connection might be. I do see that I don't have the requisite files: root@dur:~# root@dur:~# ll /var/lib/mailman/data/aliases ls: cannot access /var/lib/mailman/data/aliases: No such file or directory root@dur:~# At what stage were those aliases created? How can I create them? Is that what's causing the error error: open database /var/lib/mailman/data/aliases.db: No such file or directory Aug 28 01:17:22 dur postfix/smtpd[19709]: connect from localhost[127.0.0.1]?

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  • Good Lambda Probe Alternative

    - by joel_gil
    hello everyone i was just wondering of a good Lambda Probe alternative for monitoring MySQL server with GLassfish The cath is that we dont want just a current monitor but sth that will keep a history since i am going to stress test some servers and i would like sth that outputs the data either in tables or graphic so i can then run some statistical analysis I hope my question was understood, thanks in advanced

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  • What can cause a segmentation fault (11) in apache2 after activating ssl

    - by MadMaxAPP
    Configuration is as follows: OpenSuse 12.1 minimal installation 64 bit ISPConfig 3.0.4.6 Everything runs smooth but if I activate SSL for apache2, the web server becomes unavailable. The log (error.log) fills with always the same segmentation fault error message (around 20 times a second) [notice] child pid 9178 exit signal Segmentation fault (11) ... What is the best way to find what causes the problem?

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  • Cache coherence literature for big (>=16CPU) systems

    - by osgx
    Hello What books and articles can you recommend to learn basis of cache coherence problems in big SMP systems (which are NUMA and ccNUMA really) with =16 cpu sockets? Something like SGI Altix architecture analysis may be interesting. What protocols (MOESI, smth else) can scale up well?

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  • X window (or whole linux system) replace Caps Lock with ESC *and* Control

    - by gcb
    on windows there are several key maps applications that replaces Caps lock with ESC on a single 'press and relase' and with a Control signal if hold and another key is pressed. Is there any way to do something similar on linux? Ideally on the whole system, but if it is only for X window it is fine too. i'm currently writting scripts with the xautomation package tools. but i guess there is already a better way to do that via configurations.

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  • activate wireless chip on ubuntu

    - by Charles
    I am currently using ubuntu 10.10 on my laptop , the model of my wireless chip is broadcom BCM4312 802.11b/g LP-PHY . I tried to activate the driver for the chip by clicking menu bar System - Administration - Additional Drivers . and activated Broadcom STA wireless driver. But the laptop can't detect any wireless signal still. Do I have to do any additional work to make the chip work ? Or how can I test if there is physical damage to the chip itself

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  • Wireless vs. Wired: which is faster?

    - by studiohack
    I have the option of hooking up my machines to the internet either wirelessly or via ethernet cable (wired). I'm curious as to which is faster; the approximate wireless signal strength (average) is about 60%. My question is, would my internet be faster if I used ethernet, resulting in a stronger connection?

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  • Can you plug DVD/Game system into an LCD?

    - by Xeoncross
    All the LCD's in our house have DVI and VGA inputs. None support S-Video or any analog formats. Our game systems (nes, snes, n64, ps, ps2, gamecube, etc..) and DVD and VHS players only have composite (the yellow/red/white cords..?) or S-Video (that PS2-input like cable..?). How can I convert the signal these analog systems output to work on VGA or DVI?

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  • Download Virus/Malware Purposefully

    - by Matt Hanson
    Where can I download a virus, work, trojan, etc. for analysis? Yes, I'm actually hunting for malware, rather than keeping it at bay and hiding behind antivirus software and firewalls. I plan to analyze it in a lab for a project, but don't know where to even begin finding one.

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  • visio alternatives

    - by Jason S
    I need an alternative to Visio for making diagrams (particularly signal processing block diagrams) that includes some kind of custom stencils + connection points. I just spent 2 hrs learning bits and pieces of Dia only to find that it has no rotational capabilities, not even 90 degree rotations. Otherwise it's great. Any suggestions?

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  • Why might one host be unable to access the Internet, when it can ping the router and when all other hosts can?

    - by user1444233
    I have a Draytek Vigor 2830n. It's kicking out a 192.168.3.0 LAN. It performs load-balancing across dual-WAN ports, although I've turned off the second WAN to simplify testing. There are many hosts on the LAN. All IPs are allocated through DHCP, most freely allocated from the pool, but one or two are bound to NIC MAC addresses. All hosts can access the Internet, save one. That host (192.168.3.100 or 'dot100' for short) gets allocated an IP address (and the right gateway address, DNS server addresses, subnet etc.) dot100 can ping itself. It can ping the gateway, and access the latter's web interface via port 80. It's responsive and loss-free (sustained ping over a couple of minutes reports no data loss). Yet, for some reason that evades me, dot100 can't ping an external IP address or domain name. I suspect it's never been able to, because it was getting some Internet access from a second adaptor (different subnet), but that's now been turned off, which exposed the problem. In dot100, I've tried: two operating systems (Windows 8 and Knoppix), to rule out anti-virus programs etc. two physical adaptors two cables, on each adaptor two IPs (e.g. .100 and .103 assigned by Mac and .26 from the pool) both dynamic and assigned (MAC-bound) DHCP-allocated IPs but none of this experiments yielded any variation in the result. dot100 is a crucial host. It's a file server for the network, so I need it to be reliably allocated a consistent IP. Can anyone offer a potential solution or a way forward with the analysis please? My guess My analysis so far leads me to believe it's a router issue. I've checked the web interface very carefully. There are no filters setup in Firewall - General Setup or Filter Setup. I suspect it's a corrupted internal routing table, but the web UI shows this as the Routing table: Key: C - connected, S - static, R - RIP, * - default, ~ - private * 0.0.0.0/ 0.0.0.0 via 62.XX.XX.X WAN1 * 62.XX.XX.X/ 255.255.255.255 via 62.XX.XX.X WAN1 S 82.YY.YYY.YYY/ 255.255.255.255 via 82.YY.YYY.YYY WAN1 C 192.168.1.0/ 255.255.255.0 directly connected WAN2 C~ 192.168.3.0/ 255.255.255.0 directly connected LAN2

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  • How to modify IMM password from the default one?

    - by evachristine
    We cannot modify the default USERID/PASSW0RD on an IMM because when we try it modify the USERID's password with a logged in USERID user (that has the "max" rights) we get this message after clicking on "SAVE" (save the new password..) Could not modify password: *** Provider OSBase_AccountProvider(21770) exiting due to a SIGSEGV signal Our question: How can we modify the default password to something else? UPDATE: by IMM we wanted to mean this: https://en.wikipedia.org/wiki/IBM_Remote_Supervisor_Adapter#Integrated_Management_Module_.28IMM.29

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  • New monitor connected to HDMI adaptor doesn't show output after booting

    - by Paul
    Hello out there in the multiple monitors’ world. I am a very old newbie in your world and need help. I just purchased a new Asus VH236H monitor and hooked it up the HDMI port of an ATI Radeon HD4300 / 4500 Series display adaptor. I left the old Princeton LCD19 (TMDS) hooked up to the DVI port of the same display adaptor. Both monitors displayed the boot sequence, after I fired good old Sarastro2 (Asus P5Q Pro Turbo – Dual Core E5300 – 2.60 GHz) up. The Asus lacked one half of a second behind the Princeton until the Windows 7 Ultimate SP 1 boot up was complete. Then the Asus displayed “HDMI NO SIGNAL” and went into hibernation. The Princeton stayed lit up as before. Both monitors are displayed on the “Screen Resolution Setup Display” and I plaid around with them for a while. The only thing I accomplished was to shove the desktop icons from the Princeton to the still hibernating Asus. The “Multiple displays:” is set to “Extend these displays”, the Orientation is “Landscape” and the Resolutions are set on both to the “recommended” one. Both monitors show that they work properly in the advanced Properties display. What am I doing wrong, what am I missing? Never mind the opinions about the different resolutions of the two monitors. I always can unhook the Princeton and give it to a Goodwill Store if I do not like the setup. I just would like to make it work. Any constructive help is very much appreciated, Thank you. Thank you Anees Bakrain Only the ATI Radeon HD 4300/4500 Series adapter is displayed in the Device Manager, for that reason I have to assume that the onboard display adaptor is not active. All 40 drivers of Sarastro2 are up to date and the HDMI cable can not be the problem because both monitors displayed the boot sequence up to the moment when Windows 7 was loaded completely. This was the moment, when the Asus monitor lost its signal. Both connectors, HDMI and DVI are connected and removing the DVI connector would not solve my problem of running both monitors simultaneously. However, your suggestions shifted my seventy one year old brain into the next gear. The only question remaining is; “Why the signals to the Asus monitor stop after the sequence is complete”. The ATI Radeon HD 4300/4500 Series adapter seems to be capable of sending simultaneous HDMI and DVI signals, what is done during the boot sequence. Why do the signals change after the boot sequence is complete is the key question or der springende Punkt? Is this a correct assumption slhck?

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  • Managing a wireless internet connection

    - by cornjuliox
    I've just recently purchased a USB wi-fi adapter and have been using the software (for Windows XP) that comes with it to search for and connect to networks, but it's really quite slow and featureless. Are there free/OSS alternatives for Windows XP that can I can replace it with? Preferably something that can, in addition to connecting/searching for wireless networks, display stats like signal strength and transfer speeds on graphs so I can better monitor the quality of my connection?

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  • Have Ubuntu auto-connect to wireless AP without logging in

    - by dragonmantank
    We have an ubuntu box set up to do some monitoring but due to the placement are unable to run CAT5 to the box itself. I have an Atheros PCI card that works great as long as someone is logged into Gnome and it doesn't disconnect from the AP during that time. Is there a way to have Ubuntu connect to the AP during boot, and always reconnect if it finds a signal from a specified AP? The box would have a static IP and only connecting to a specific AP using WEP.

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  • methods for preventing large scale data scraping from REST api

    - by Simon Kenyon Shepard
    I know the immediate answer to this is going to be there is no 100% reliable method of doing this. But I'd like to create a question that details the different possibilities, the difficulty of implementing them and success rates. I would like to go from simple software ip/request speed analysis to high end sophisticated soft/hardware tools, e.g. neural networks. With a goal of predicting and preventing bogus requests and attempts to scrape the service. Many Thanks.

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  • Using two Cisco Aironet 1100's

    - by daniel
    Is it possible to use two of these both providing connectivity to the same network name for additional signal by having one plugged into a hot data port and having the other only powered by the AC? It seems to have worked for one day, then it stopped and I have the middle light blinking, and the other "hot" one solid in the middle and flashing rapidly on the last light.

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  • Recovering files using Recuva

    - by Nev Meek
    I'm currently using Recuva to recover some files from an external NTFS disk. It finds the files I'm interested in during it's analysis phase (when tools like test-disk fail to find them at all) and reports them as "Not-deleted" and a big green marker to signify 100% chance of recovery. However when it tries to recover the files I get a "the system could not find the file specified" message. Is there any easy way to recover non-deleted files off of a disc that I can no longer simply access through explorer?

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  • How can I start an off PC remotely?

    - by serena
    I am using Team Viewer to control my PCs remotely. It lets me restart my PC, and this is a good feature. Is it possible to remotely start a PC which is already turned off? Maybe it's impossible but I like to ask Superusers. All I can think of is something like sending a signal to PC's BIOS. Assume that all components of PC is connected to electrical socket and the router is on.

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  • Kubuntu solution for analysing/recording streamed flash audio?

    - by marcusw
    I have a Kubuntu system which I stream amateur radio sound to via a flash interface. I want to be able to record the sound that the flash player is making at the press of a button. I also need the capability to do (hopefully real-time) spectrum analysis on the sound. I need a program (a firefox add-on would be ideal) that can do this for me.

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  • Connecting a DVI splitter

    - by Steve Carter
    Hi I am trying to use a DVI splitter so I can use either my pc monitor or my TV which is close to the pc, Both monitors work fine if the splitter is connected after the pc has booted up, But if the pc is re booted both the monitors show a blank screen after saying there is no signal. I have been told it could be because the monitors are working on different resolutions is this the case, If so how can I cure the problem without having to keep changing the res on TV monitor

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