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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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• Is there anything that can be done to make X forwarding over LAN less painful?

  - by Earlz

  I have two *nix machines that I like to remotely do graphical things sometimes with. One of those machines is my Arch Linux media server, and another is my OpenBSD router/general server. My current task was installing a Windows XP over virtual box on my media server. I preferred to do the installation from my main workstation so that I could continue to watch TV from my media server on it's "actual" display. I soon noticed that X forwarding is quite painful though, even over low-latency LAN connections. Are there any settings I can tweak to make it a bit less painfully slow, jittery, and laggy? My LAN is rather small, 100Mbit, and ping times to the other box average at about 0.15ms. Also, I know Virtualbox has a VNC mode it can use instead of doing X forwarding, but this particular task was just an example

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• apache returning "The connection was reset"

  - by usjes

  One of my dedicated servers had some network issue today and the data center has to replace some router. Since then the sites on that server returns "The connection was reset" error most of the time. I tried installing nginx and it opens better, but it still shows the error sometimes. Everything in the config seems normal, what could be causing this error? UPDATE: Just noticed that in whm apache status there are always only 1 requests currently being processed, 8 idle workers. I know for sure the server received thousands of requests per minute. What could be limiting this to such a low number?

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• Altq limits not being applied to UDP transfers

  - by overkordbaever

  I have a OpenBSD server acting as a router/firewall with yhr packet filter ruleset shown below, a linux server, and a linux client. When transferring files (using netcat) by TCP, the limits are applied (for example the 100mbit limit in the example), though when transferring data by UDP, the limits aren't applied; the file always takes the same amount of time no matter the queue bandwidth limit I set (I can even turn off the queues completely, and will still get the same result). Why aren't the queuing rules applied to UDP packages? The rules used: #queue rules altq on { $int_if, $ext_if } cbq bandwidth 100Mb queue { def, low } queue def bandwidth 0Mb cbq(default) queue low bandwidth 100Mb cbq #Passrules test pass out quick from $int_if to $ext_if queue low pass in quick from $ext_if to $int_if queue low pass out quick from $ext_if to $int_if queue low pass in quick from $int_if to $ext_if queue low I suppose this may be related a question I've previously asked, though since it's more of a separate question, I suppose a separate question should be used for this

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• Cannot assign port 4 to WAN on TP-Link WR740N by DD-WRT wiki

  - by Victor Sergienko

  I'm following the DD-WRT instruction to get TP-Link WR740N v3's Port 4 on a different VLAN, but this doesn't happen. First, I have no "Setup VLANs" settinngs tab in DD-WRT v24-sp2 (07/20/12) std r19519. I can get Internet on Wi-Fi if assigning eth1 to "WAN Port", but then all Ethernet ports get on the same VLAN and any wired connection grabs the DHCP address and Internet connection from router. When following the "old" instruction, if I run, say, nvram set vlan2ports="2 5*", should there appear a new interface, vlan2, in ifconfig, after ifconfig vlan2 up? It doesn't - does it mean there is no support for different VLANs in my software/hardware? What am I missing? Is it impossible to create more VLANs on TP-Link740?

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• Ubuntu 9.04 Cannot Connect to visible open wifi ap (reason 6)

  - by Andrew Bolster

  I'm travelling currently so the last network i connected successfully to was my home wpa-psk network. I hadn't tried anything until i got to my accommodation that is an open network (that I'm on now on the Win7 partition on my laptop). The network (and a similar archetypical 'linksys' open network, aswell as some protected local networks are correctly displayed in network-manager and upon selection, it happily spins around to its hearts content for a while before saying 'no chance boy'. /var/log/syslog spills out the usual combination of wpa_supplicant and kernel messages, the most interesting of are that the kernel deauthentication reason 6 response. 6 apparently means class2FrameFromNonAuthStation...Client attempted to transfer data before it was authenticated. Anyone seen anything like this? I've already tried going closer to the router to no avail. I don't remember seeing this any other time I've connected to a open AP, even if that AP is far away. (Signal strength for this AP is good, kismet says its around -57dBm, well above the threshold of -80dBm, and I've tried all the suggestions from the 'Related Questions'

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• Setup IIS 7 as FTP Server that is connectable outside of my local network

  - by Usta

  I was able to setup an FTP site that I was able to access via ftp://127.0.0.1/ or my local(static) ip. To do this I followed these instructions (with the exception that I did not bind to 127.0.0.1 as suggested) http://learn.iis.net/page.aspx/301/creating-a-new-ftp-site-in-iis-7/ I have created a firewall exception for port 20 and 21, and setup port-forwarding on my wireless router. But I can only access the site via local-host, and I need to have a friend have read access to it. So how do I enable remote access to it? (I'd rather not purchase a domain-name) My setup: IIS 7.5 Windows 7 Professional Wireless Network Norton Internet Security 2012 An Internal Static IP Address

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• Performance issues with jms and spring integration. What is wrong with the following configuration?

  - by user358448

  I have a jms producer, which generates many messages per second, which are sent to amq persistent queue and are consumed by single consumer, which needs to process them sequentially. But it seems that the producer is much faster than the consumer and i am having performance and memory problems. Messages are fetched very very slowly and the consuming seems to happen on intervals (the consumer "asks" for messages in polling fashion, which is strange?!) Basically everything happens with spring integration. Here is the configuration at the producer side. First stake messages come in stakesInMemoryChannel, from there, they are filtered throw the filteredStakesChannel and from there they are going into the jms queue (using executor so the sending will happen in separate thread) <bean id="stakesQueue" class="org.apache.activemq.command.ActiveMQQueue"> <constructor-arg name="name" value="${jms.stakes.queue.name}" /> </bean> <int:channel id="stakesInMemoryChannel" /> <int:channel id="filteredStakesChannel" > <int:dispatcher task-executor="taskExecutor"/> </int:channel> <bean id="stakeFilterService" class="cayetano.games.stake.StakeFilterService"/> <int:filter input-channel="stakesInMemoryChannel" output-channel="filteredStakesChannel" throw-exception-on-rejection="false" expression="true"/> <jms:outbound-channel-adapter channel="filteredStakesChannel" destination="stakesQueue" delivery-persistent="true" explicit-qos-enabled="true" /> <task:executor id="taskExecutor" pool-size="100" /> The other application is consuming the messages like this... The messages come in stakesInputChannel from the jms stakesQueue, after that they are routed to 2 separate channels, one persists the message and the other do some other stuff, lets call it "processing". <bean id="stakesQueue" class="org.apache.activemq.command.ActiveMQQueue"> <constructor-arg name="name" value="${jms.stakes.queue.name}" /> </bean> <jms:message-driven-channel-adapter channel="stakesInputChannel" destination="stakesQueue" acknowledge="auto" concurrent-consumers="1" max-concurrent-consumers="1" /> <int:publish-subscribe-channel id="stakesInputChannel" /> <int:channel id="persistStakesChannel" /> <int:channel id="processStakesChannel" /> <int:recipient-list-router id="customRouter" input-channel="stakesInputChannel" timeout="3000" ignore-send-failures="true" apply-sequence="true" > <int:recipient channel="persistStakesChannel"/> <int:recipient channel="processStakesChannel"/> </int:recipient-list-router> <bean id="prefetchPolicy" class="org.apache.activemq.ActiveMQPrefetchPolicy"> <property name="queuePrefetch" value="${jms.broker.prefetch.policy}" /> </bean> <bean id="connectionFactory" class="org.springframework.jms.connection.CachingConnectionFactory"> <property name="targetConnectionFactory"> <bean class="org.apache.activemq.ActiveMQConnectionFactory"> <property name="brokerURL" value="${jms.broker.url}" /> <property name="prefetchPolicy" ref="prefetchPolicy" /> <property name="optimizeAcknowledge" value="true" /> <property name="useAsyncSend" value="true" /> </bean> </property> <property name="sessionCacheSize" value="10"/> <property name="cacheProducers" value="false"/> </bean>

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• I get regular power surges and my UPS ticks a lot due to a welding plant. Is this good or bad?

  - by EApubs

  In our home, there is a mechanic who often use a welding plant. When he use it, I think we get a power surge. My UPS ticks madly (not beep, it ticks). Sometimes, I even lose power to the keyboard. When typing, some keys get missing. 1) My question is, is it good for the computer? The UPS claimed to have surge protection. But isn't it working? What should I do to protect my PC? 2) The second question is, I also have a broadband router which is not connected to the UPS. Will it be effected?

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• Sonicwall NSA 3500, public ip for SSL VPN clients is not visible

  - by SlyMcFly

  I have a Sonciwall NSA 3500 and I'm setting up the SSL VPN according to this guide. I get through setting up the Sonicwall router, but then to test it says "Users can now go to the public IP of the sonicwall. Notice the new “click here for SSL login” hyper link". However, when I go to the public ip of the Sonicwall I don't get a web page, it just times out. Is there some other setting that I'm missing in order to make the SSL VPN login page public?

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• Trouble with resolving hostnames on CentOS using Bind

  - by cabaret

  I'm taking a course on server administration at school and I have managed to set up virtual hosting in apache and a dns server on a virtual machine. However, I have now set up an old pc to run CentOS and I'm trying the same on that box. The problem I ran into now is that I can't resolve hostnames from the linux box. I have set up the nameserver in /etc/resolv.conf to the IP of the CentOS machine, but when I try for example ping google.com I get ping: unknown host google.com However, when I do ping 66.102.13.105 (which is the Google IP, figured that out by pinging on my mac) I get: PING 66.102.13.105 (66.102.13.105) 56(84) bytes of data. 64 bytes from 66.102.13.105: icmp_seq=1 ttl=52 time=15.5 ms Slightly confused why this is happening. Could it be because of my router sitting in between the linux machine and the cable modem? It's a D-Link somethingsomething. Thanks in advance

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• Connect to wired and wireless networks at same time, Ubuntu

  - by Gary Chambers

  Currently, I have a media PC running Ubuntu 10.04 that I am trying to connect via a wired network cable directly to a NAS box, and wirelessly to the router. This works no problem after I run sudo /etc/init.d/networking restart but I can't get both interfaces to come up on system startup. My /etc/network/interfaces file reads as follows: auto eth0 iface eth0 inet static address 10.0.1.2 netmask 255.255.254.0 broadcast 10.0.1.255 network 10.0.1.0 auto wlan2 iface wlan2 inet dhcp As I say, I know this works, because I can get it to work by restarting the network interfaces, but I can't bring them both up on system startup. Does anyone know why this might be?

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• Un-balanced network speed although using fiberoptic cable line

  - by Hoàng Long

  I'm not sure this is a right place to ask this question, but there's a strange thing that I don't quite sure what the reason is. My company has hired a fiberoptic cable line for network use (Wifi and cable through a router). But the strange thing is that, whenever someone view YouTube or listen stream music, then network speed for all the others become extremely slow. The download speed for that person is about 4-5 MB/s (or more), but others suffer. I'm still a newbie about networking. But I know there should be a solution. Could anyone tell me a way to stop this bad behavior? It's not possible for asking people not viewing YouTube, since that's part of their jobs. Any insights about this problem would be very welcome.

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• wireless repeater vs wireless bridge?

  - by Kossel

  Scenario: I have a ADSL modem inside the studio which is connected with some wired/wireless devices. but when I'm in the backyard with my laptop the wireless signal is very poor, so the connection is very unstable. I have an old belkin wireless router and I read that it can be useful in this scenario. after some search, it's compatible with DD-WRT, and seems setting it both wireless repeater or wireless bridge can do the job. but which is better for speed and stability or for my purpose they are the same? wireless repeater wireless bridge

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• Regarding temperature in our server cabinet

  - by kafka

  We have a floor standing server cabinet, which sits in the corner of our office. There is no AC in the office, and the average temperature is around 21C (70F). The server cabinet currently contains 2 tower servers, a switch and a router. It's well enough ventilated, but does get understandably warm in there. We've recently put a thermometer in there to monitor the temperature, and recently I've noticed the temperature hit 33C (91F). What I'd like to know is if this temperature is too high, and whether there is a maximum temperature we should not be exceeding?

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• Files turned into folders on external hard drive

  - by Kashif

  I have a networked hard drive where I like to store audio/video/software and all sorts of other files for my house. While the software files are all intact and working, many of my video and audio files have been turned into folders! Can anyone explain why this is happening, how I can prevent it, and if it is possible to revert these "folders" back into files. Thanks much! An example of what the folders are named: "Highschool Graduation.avi", "Birthday party.avi", "Somesong.mp3" The HDD is connected to a Linksys E4200 router (Firmware Version: 2.0.37). This is how the HDD is networked.

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• Multiple VLANs on a single subnet

  - by mstaessen

  I would like to establish the setup shown below. The image is taken from (http://gcharriere.com/blog/?p=620) and explains how to set this up on a brocade device. I would like to use an ubuntu server to do the routing. Right now, the switch and the server/router are connected with a trunk and the server uses the vlan package, kernel module and (inner) subnets for routing. I would like that: no IP addresses get lost in the subnetting (outer subnet is /26, inner subnets are /28) I don't want the rigorous subdivision of my outer subnet. I want to assign a VLAN to any IP in the outer subnet. How do I need to configure my interfaces? What is the "ubuntu" translation of "ip follow ve"? Thanks!

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• Windows VPN not authenticating from ADSL to Wireless link

  - by deanvz

  I have a normal windows VPN on a computer connecting to a 196.201.x.x/24 IP. If this VPN tries to connect from any address in the 41.x.x.x range it cant get there. The server is a normal windows 2008 server, running exchange with a PPPoE IP natted to a public IP on the public gateway of the wireless network as the server is on site and its connectivity is derived from Mikrotik RB's. The computer on the 41 range can traceroute and ping the server, but the VPN does not authenticate. When on the network or any other, the VPN works fine. Is there something that could be configured on the VPN client? All firewall settings of a standard ADSL router have been checked and found to block only ICMP's. Is this a VPN configuration problem or a network issue?

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• network user isolation

  - by seaquest

  My question is for a network with a Linux iptables router gateway. How can it be possible to prevent inter-network traffic of those users. Think this case as a public network, IPs are distributed through linux gw and users are authenticated thru the gateway. We want to protect public users from public users. Network is not wireless and I can not use Wireless AP user isolation. Actually I have a simple method. Subnet the network into /30 mask. Give minimum IP of each subnet to the gateay and ditribute those /30 IPs from the subnet. But this is pretty costly for such an aim. I want to ask for other methods Thanks.

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• How to set the IP address in a customized OpenWRT compilation

  - by Berdus

  I have been struggling today customizing OpenWRT. I checkout the stable using SVN, "make menuconfig" to customize the image, "make" it and run it on a router. Almost all my modifications work, except for the (Seemingly trivial) task of changing the default 192.168.1.1 address. I tried numerous files (scripts as well as config files) but I can't seem to change it (I can change it for a brief moment after boot using the "preinit" file, but after a few seconds it reverts to default). I suspect I should be setting it in the /etc/network file, but modifications there seem to be overwritten during boot. Maybe it has something to do with the br-lan interface? Does anybody have some thoughts on the subject? Thanks!

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• Windows 8.1 killed my wifi

  - by char1es

  Was running Windows 8 on a Lenovo G780 and updated to windows 8.1 Wifi does not work anymore, i always receive a dns server not responding error. I have tried using public dns servers from Google but with still no results. I've restarted my router with no results. All other devices on my network are having no trouble at all. I've tried updating the wireless driver but the manufacturers website claims that the Win8.1 driver should be updated with the update from windows. So i cant find a wireless driver... Anyone else having this error and does anyone have any ideas on how to fix it?? EDIT: here are the driver details: Broadcom 802.11n Network Adapter Provider: Microsoft Driver Date: 2013-05-31 Driver Version: 6.30.223.102 Digital Signer: Microsoft Windows Thanks

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• How to increase Remote Desktop resolution?

  - by BugAlert

  I'm using Windows 7 on a PC and connect to it via Remote Desktop Connection for Mac by MS, using a Mac. On the Mac, I have a 27" Display with 2560 x 1440 px resolution. The PC has a high performance graphics card (one of those that needs an additional power supply). Both machines are connected via network cable to a router. So network should be insanely fast. However, the max resolution I can get is 1400 x 1050. The PC just has a old and bad 21" monitor connected to it. How can I increase the resolution to 2560 x 1440 to work fullscreen with the Apple LED Cinema Display via Remote Desktop? Maybe I shouldn't even ask, because I already experience some lag at the low resolution of 1400 x 1050. But I guess this can be resolved as well?

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• Airport Express configuration

  - by Christina

  We are trying to set up remote access to a computer that houses a server fro a particular program we are running. The program says we need to configure the office router. In the firewall settings it says to open ports 5345-5351 (TCP only). Port Forwarding: You will also need to forward the same range of ports (5345-5351) to the computer running the Server. This typically requires that the computer running the Server be assigned a static IP on the local network. Having trouble figuring out which IP address we actually need to be using on the client side of this program in order to access the server computer. Can someone walk through this process?? We are working on Mac OSX 10.5. Thank you in advance!

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• once VPNed into pfSense, unable to hit the public URLs of my websites - they are routed to the pfSense box

  - by Sean

  I have a pfSense box setup as the firewall/router/VPN appliance at my colo. Once I VPN into the colo (either pptp or openvpn, pptp preferred due to multiple clients and ease of configuration), I am able to hit all my servers by their private 10.10.10.x ip and am able to browse the public internet without issue. When I try and hit the URL of a domain hosted by one of my servers, I am prompted for credentials. If I login using the pfSense credentials, I'm connected to pfSense as if I'd used it's internal IP. If I hack my hosts file to point url - server private IP it works fine, but this is obviously not a good solution. To recap: not connected to VPN - www.myurl.com works connected to VPN - www.myurl.com never makes it to the correct server, but is sent only to the pfSense box I'm sure it's something small that I've missed in the pfSense config.

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• which vista services can be disabled with impunity?

  - by GwenKillerby

  I use Vista on a HP pavilion DV2 laptop. When I look through all the services my laptop starts, it really seems there's way too much of it. I multi boot with XP and 7. Both startup in 40 seconds. Vista takes four minutes. Is there some software that can determine which services I don't need? On 7, there's no propietary HP stuff at all, yet it seems to run fine. Because all these service, there's a LOT of them and some just sit there doing nothing, monitoring for updates I don't really need or want or need to know about the second they're available. my laptop is the only computer i use at home, there's no home network, aside from the modem-router, which is cabled, not wifi. Take for instance Parental controls, and stuff for people with bad eyesight, Tablet PC. I really never use any of that stuff. Hope this question is specific enough. thanks, Gwen.

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