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  • DHCP-server doesn't start at boot because of wrong startup order

    - by stolsvik
    Apparently the isc-dhcp-server is started too early in the boot sequence, it states that it has nothing to do. If I just log directly in as root and start it using the init.d-script, it starts normally. My setup is basically an utterly standard router, with an eth0 on the inet side, and an eth1 on the lan side. However, I've defined a bridge instead of the eth1 for the lan-side. Thus, the lan-part of the network isn't up until the bridge is up. I currently believe that the dhcp server is brought up before the bridge is brought up, probably because the bridge is brought up with the 'networking' task, while the eth's are taken up with the 'network-interface' tasks - which are run earlier. (also, the bridge takes a small age to get up compared to the eth's). If I do take away the bridge config, instead using eth1 directly for the lan side, things work. (However, judging by syslog, things are still tight.) Ideas of how the get DHCP to start later? (The reason for the bridge, is to be able to use KVM with bridged networking..)

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  • Server 2012 R2 DNS Conditional forwarding not working reliably, possible caching issue?

    - by Matt
    I have a bit of a home lab setup with a domain controller that is acting as the DNS server for my network. For everything, it's working fine and forwards external DNS requests to my ISP. The household recently wanted to get Netflix going and it seemed a DNS option was better than a VPN to get around the region locking, so I signed up for unblock-us.com Since I have a Windows DNS server I thought I'd be clever and make use of conditional forwarders and added the Netflix domain to the list. Initially this worked well and all devices on the network could now access Netflix, however after about an hour going to the Netflix site would result in a page cannot be found. Doing an nslookup of Netflix.com from my PC resulted in it not returning any IP addresses. As a test, I deleted the Netflix domain from the DNS servers cache and things started working again - devices could get to the site again however the same thing happens again after around half an hour to an hour. Have I missed something here that's causing it to stop working?

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  • IP stops working from time to time

    - by Mattias
    Hi, have a problem that I can't seem to find the reason for. We are running a small network with windows clients(XP/Win7) and windows servers(2008 sp2/2008r2). The domaincontroller is working as DC, DNS, DHCP, VPN. We have a Level1 FBR4000 between internet and our internal network. The problem is that from time to time specific IP-adresses stops working, the only way I have gotten the devices to work again is to exclude the specific IP from the DHCP address pool and getting a new IP, then everything works again. It seems as the specific IP is beeing banned/blocked somewhere but I just can't figure out where. Anyone got an idea as to where I should start to look? I could also point out that I just reinstalled all servers due to a officemove and was hoping to get away from this problem but it just showed up again. This last time it was my iPhone that got stuck through the Wi-Fi...

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  • Tiny linux box with 2xGbLAN, WLAN and 10MB/s AES throughput?

    - by Nakedible
    I'd like to find a small linux box with the following specifications: Small (mini-ITX size is OK) Fanless Runs Debian At least two gigabit network interfaces WLAN that supports "host ap" with hostapd + mac80211 in AP mode Can encrypt AES at least 10 megabytes per second Total cost $300 or less Solutions from multiple parts also accepted - I can buy an external network card etc. and build the box myself if the components are available. If you don't know about the "host ap" thing, just suggest your solution, I'll find out if I can get that resolved. If I can't get all that, I can possibly skip the "runs Debian" part, and I can definitely skip the hostapd part if the box can be a wireless access point with multiple ESSIDs out of the box. Something like Asus RT-N16 is close - doesn't run Debian easily, and probably doesn't encrypt AES fast enough. Something like Zotac ZBOX HD-ID11 is also close - no idea which WLAN card it has and it lacks second gigabit interface, but otherwise nice.

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  • information about /proc/pid/sched

    - by redeye
    Not sure this is the right place for this question, but here goes: I'm trying to make some sense of the /proc/pid/sched and /proc/pid/task/tid/sched files for a highly threaded server process, however I was not able to find a good explanation of how to interpret this file ( just a few bits here: http://knol.google.com/k/linux-performance-tuning-and-measurement# ) . I assume this entry in procfs is related to newer versions of the kernel that run with the CFS scheduler? CentOS distro running on a 2.6.24.7-149.el5rt kernel version with preempt rt patch. Any thoughts?

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  • Simple NAS setup for Ubuntu

    - by Sean Houlihane
    So, I want to connect my shiny new NAS (QNAP TS-210p II) to my Ubuntu 11.10 box. I have a 2nd Ubuntu machine, but I don't use that enough to be too worried about it. Use is ideally to offload all storage except for system (which can then run off a 30GB flash drive). The main machine also runs Myth front/backends. Both are on a wired network currently. I have got a basic setup working, mounted over NFS, but have some issues, and whenever I look for answers, I seem to get unto the UbuntuServer domain, with what seems like more detail than I want in an answer. Questions I have identified so far: 1) Sharing UIDs to get file permissions correct. LDAP or something else? What is necessary to make this work? 2) Mounting an NFS device reliably. Do I just add it in fstab or is some sort of auto-mount advisable? Its a wired network, but I shouldn't need to worry about reboot after power-outages and sequencing...

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  • Access my mac's local server from a windows machine

    - by Simon Davies
    I am running my test sites on my mac, but I would like be able to use my windows machine to also access this server and be able to write / read fiels form this server. I can access my sites on my windows by using the IP address 192.168.1.???. But I would like to be able to use my windows machine to also access the fiels and edit them. Any ideas much appreciated. Some details: Mac OSX SL file sharing set to on. Windows 7 (tried setting up network map using afp://192.... but nothing) Both machines are connected to a local network, with several other machine (windows) Thanks

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  • More on Oracle OpenWorld 2012

    - by Maria Colgan
    With only two weeks to go until Oracle OpenWorld, it is time to start planning your schedule. Every year folks ask me what Optimizer related sessions they should go and see at OpenWorld. Below are my top two picks for each day of the conference, to get your schedule started. Sunday, September 30th at 9am Beginning performance tuning Session UGF 3320 in Moscone West, room 2022 Sunday September 30th at 12:30pm Ten Surprising Performance Tactics Session UGF10426 in Moscone West, room 2016 Monday October 1st at 12:15pm The Evolution of Histograms in Oracle Database Session CON2803 in Moscone south, room 302 Monday October 1st at 1:45pm A Day in the Life of a Real-World Performance Engineer Session CON8404 in Moscone south, room 303 Tuesday October 2nd at 11:45am Oracle Partitioning: It’s Getting Even Better Session CON8321 in Moscone South, room 101 Tuesday October 2nd at 1:15pm Oracle Optimizer: Harnessing the Power of Optimizer Hints  Session CON8455 in Moscone South, room 103 Wednesday October 3rd at 3:30pm SQL Plan Stability: Post 11g Upgrade—Verizon Wireless’ Experience Session CON4485 in Moscone South, room 302 Wednesday October 3rd at 5pm Five SQL and PL/SQL Things in the Latest Generation of Database Technology Session CON8432 Moscone South, room 103 Thursday, October 4th at 11:15pm How the Query Optimizer Learns from Its Mistakes  Session CON3330 in Moscone west, room 3016 Thursday, October 4th at 12:45pm Oracle Optimizer: An Insider’s View of How the Optimizer Works Session CON8457 in Moscone South, room 104 Don't forget to pickup an Optimizer bumper sticker at the Optimizer demo booth. This year we are located in booth 3157, in the Database area of the demogrounds, in Moscone South. Members of the Optimizer development team will be there Monday through Wednesday from 9:45 am until 6pm.

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  • Set up Work Manager Shutdown Trigger in WebLogic Server 10.3.4 Using WLST

    - by adejuanc
    WebLogic Server's Work Managers provide a way to control work and allocated threads. You can set different scheduling guidelines for different applications, depending on your requirements. There is a default self-tuning Work Manager, but you might want to set up a custom work manager in some circumstances: for example, when you want the server to prioritize one application over another when a response time goal is required, or when a minimum thread constraint is needed to avoid deadlock. The Work Manager Shutdown Trigger is a tool to help with stuck threads in which will do the following: Shut down the Work Manager. Move the application to Admin State (not active). Change the Server instance health state to failed. Example of a Shutdown Trigger set on the config.xml for your domain: <work-manager>   <name>stuckthread_workmanager</name>   <work-manager-shutdown-trigger>     <max-stuck-thread-time>30</max-stuck-thread-time>     <stuck-thread-count>2</stuck-thread-count>   </work-manager-shutdown-trigger> </work-manager> Understand that any misconfiguration on the Work Manager can lead to poor performance on the server. Any changes must be done and tested before going to production. How can one create a WorkManagerShutdownTrigger for WLS 10.3.4 using WLST? You should be able to create a WorkManagerShutdownTrigger using WLST by following these steps: edit() startEdit() cd('/SelfTuning/mydomain/WorkManagers') create('myWM','WorkManager') cd('myWM/WorkManagerShutdownTrigger') create('myWMst','WorkManagerShutdownTrigger') cd('myWMst') ls()

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  • Can a switch consume bandwidth?

    - by aashiq
    I have a network with a router and a switch. At first my ISP's optical fiber is connected with media converter input port. Than Ethernet cable (output port of Media converter) is connected with the switch. Then an output Ethernet cable is connected with our inner Microtik router. Then this router is connected with another LAN switch. From this switch we have got every connection other switch. It is our total network structure. Our bandwidth is 2 Mbps. From the 11th of March our MRTG graph shows high all the time even when my all switch is switched off except LAN switch. That's why our line is breaking up (Voice call). How could be it possible? My all PC's bandwidth is limited but when connected PC with media converter directly then the graph shows normal. That's why I can't blame my ISP.

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  • UDP multicast streaming of media content over WIFI

    - by sajad
    I am using vlc to stream media content over wireless network in scenario like this (from content streamer to stream receiver client): The bandwidth of wireless network is 54 Mb/s and UDP stream's required bandwidth is only 4 Mb/s; however there is trouble in receiving media stream and quality of playing specifically in multicast mode; means I can play the stream but it has jitter and does not play smoothly. In uni-cast I can stream up to 5 media streams correctly, but in multicast mode there is problem with streaming just one media! However when I stream from client some multicast streams; the wifi access-point can receive data correctly and I can see the video in "udp streamer" side correctly even when number of multicast streams increases to 9; But as you see I want to stream from streaming server and receive media in client size. Is this a typical problem of streaming real-time contents over wireless networks? Is it necessary to change configurations of my WIFI switch or it is just a software trouble? thank you

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  • NAT and ISP Subnet when load balancing on pfsense?

    - by dannymcc
    I have a pfsense box that I'm trying to plan the configuration for. I am going to be load balancing two ISP's, each with their own /29 static IP subnet. The question I have is in relation to the way those IP's are associated with workstations on the local network. Currently I have some workstations with local (192.168.1.0/29) IP addresses, and other more complicated workstation setups have their own public IP address. Some of the more complicated systems have a NAT 1:1 configuration where I forward a public IP address to a local IP address. Others however are directly on the ISP subnet and cannot be seen on our local network. Is this configuration possible with pfsense? If so, what terms should I be looking through the documentation for? Here is a simple/brief diagram of what I am trying to achieve.

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  • Issues connecting to WPA2 with User Authentication Mavericks?

    - by heinst
    I was on all the builds of the Mavericks beta and connecting to my University's network was fine. Then I upgraded to the public release and now I can't seem to connect to the internet. I can connect to other networks, but not my schools. Its a WPA2 network with a User Authentication. And my MacBook is a 2011? 2.2 GHz first gen i7 Quad Core with 8 GBs of RAM. Does anyone else have the same issue? Any tips on how to fix it? Thanks! heinst

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  • Vista laptop won't connect to airport extreme

    - by Hutch
    Our previous router died, and to replace it I procured an apple airport extreme. My mac, my wrt54gs (with ddwrt acting as a bridge) and a linux machine have had no problem connecting to the wireless. None of the wired clients are having a problem obviously. The problem is one of my roommates can not connect. That's not strictly true. He can connect to the network, and will, infact, get a dhcp lease. However he cannot get any packets out. Can't ping the router, can't access any web sites, nothing. However he's fine if we switch to an unsecured network. Which is obviously not acceptable. The airport only allows for 'wpa/wpa2 personal' and 'wpa2 personal' (and of course the enterprise versions there of) I keep reading about this problem in multiple spots on the web, but never see any actual answers... Anyway the laptop: hp/compaq cq50-215nr vista home premium wireess card: atheros 5007 airport is simultaneos dualband II

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  • IPv4 private address assignment

    - by helloworld922
    I'm working on a private network which uses static IPv4 addresses as well as DHCP addressing for the physical LAN network. At a previous company I worked at they would assign static addresses in the 10.*.*.* space and all DHCP/LAN addresses were assigned in the 192.168.*.* space. Both of these address spaces are defined in the IPv4 private address space and there were never any internal conflicts. From personal experience at home, school, at work, and pretty much any other machine I've dealt with extensively (Windows and a few Linux distros), the DHCP server would always by default choose an address from the 192.168.*.* address space. Now my question is can I rely on this behavior? Do DHCP servers always by default assign from the 192.168.*.* pool (or any pool other than the 10.*.*.* pool), leaving the 10.*.*.* pool free for private static addressing? If not, under what conditions might a DHCP server choose an address in the 10.*.*.* address space?

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  • UCARP: prevent the original master from taking over the VIP when it comes back after failure?

    - by quanta
    Keepalived can do this by combining the nopreempt option and the BACKUP state on the both nodes: Prevent VRRP Master from becoming Master once it has failed Prevent master to fall back to master after failure How about the UCARP? Name : ucarp Arch : x86_64 Version : 1.5.2 Release : 1.el5.rf Size : 81 k Repo : installed Summary : Common Address Redundancy Protocol (CARP) for Unix URL : http://www.ucarp.org/ License : BSD Description: UCARP allows a couple of hosts to share common virtual IP addresses in order : to provide automatic failover. It is a portable userland implementation of the : secure and patent-free Common Address Redundancy Protocol (CARP, OpenBSD's : alternative to the patents-bloated VRRP). : Strong points of the CARP protocol are: very low overhead, cryptographically : signed messages, interoperability between different operating systems and no : need for any dedicated extra network link between redundant hosts. If I don't use the --preempt option and set the --advskew to the same value, both nodes become master. /etc/sysconfig/carp/vip-010.conf # Virtual IP configuration file for UCARP # The number (from 001 to 255) in the name of the file is the identifier # $Id: vip-001.conf.example 1527 2004-07-09 15:23:54Z dude $ # Set the same password on all mamchines sharing the same virtual IP PASSWORD="pa$$w0rd" # You are required to have an IPADDR= line in the configuration file for # this interface (so no DHCP allowed) BIND_INTERFACE="eth0" # Do *NOT* use a main interface for the virtual IP, use an ethX:Y alias # with the corresponding /etc/sysconfig/network-scripts/ifcfg-ethX:Y file # already configured and ith ONBOOT=no VIP_INTERFACE="eth0:0" # If you have extra options to add, see "ucarp --help" output # (the lower the "-k <val>" the higher priority and "-P" to become master ASAP) OPTIONS="-z -k 255" /etc/sysconfig/network-scripts/ifcfg-eth0:0 DEVICE=eth0:0 ONBOOT=no BOOTPROTO= IPADDR=192.168.6.8 NETMASK=255.255.255.0 USERCTL=yes IPV6INIT=no node 1: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether c6:9b:8e:af:a7:69 brd ff:ff:ff:ff:ff:ff inet 192.168.6.192/24 brd 192.168.6.255 scope global eth0 inet 192.168.6.8/24 brd 192.168.6.255 scope global secondary eth0:0 inet6 fe80::c49b:8eff:feaf:a769/64 scope link valid_lft forever preferred_lft forever node 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:30:48:f7:0f:81 brd ff:ff:ff:ff:ff:ff inet 192.168.6.38/24 brd 192.168.6.255 scope global eth1 inet 192.168.6.8/24 brd 192.168.6.255 scope global secondary eth1:0 inet6 fe80::230:48ff:fef7:f81/64 scope link valid_lft forever preferred_lft forever

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  • Windows 7 - Remote Desktop - multiple credentials

    - by w--
    My home network consists of a couple Windows XP machines and a Windows 7 box. One of the Windows XP boxes is like a shared server accessed via Remote Desktop. I have an account on there and my gf has another. Previously I was able to save RDC shortcuts to this shared server including credentials. So in order to access the server from a computer on the network, I just needed to open the shortcut. I thus would have two shortcuts, one for my account and one for my gf's. In Windows 7, it seems to store credentials for a box based on machine name. I.e. I can only store one set of credentials per machine name. This seems incredibly stupid so my question is: In Windows 7, is there some way to have RDC shortcuts that use different credentials to login to the same target box?

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  • replacement drive cage for power edge R710

    - by bumble_bee_tuna
    Hi I'm performance tuning a DB server its a Dell R710 there is a very significant I/O bottleneck. Unfortunately the server was purchased with the 6 x 3.5 inch sata configuration which doesn't give me the leeway I need to address the issue. Before going to DAS does anyone know if it is possible to purchase a replacement front drive enclosure ? I know the server is configurable with something like 12 or 16 2.5 inch drives and it appears to be modular ? I tired contacting dell but the offshore parts department reps are not very bright lol. Thanks.

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  • VPN within a VM to allow for internet access on the host

    - by David Durrant
    I have a network connection (created under Networks and Sharing) that I use to connect to a customer's site. But when I use this to connect to the site, I loose all access to the public internet, and can only access customer specific items. I want to circumvent this issue by creating a VM and then utilizing the VM to connect to the network location and interact within the customer's domain, while leaving my host machine open to the internet. I'm not extremely familiar with networking, but I have a few basic skills. Please let me know if this is possible and what the correct procedures are. I already have a VM created with VirtualBox, and both the host and guest are running Windows 7 x64. I have created duplicate VPNs already, but can only connect successfully on the host machine.

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  • The canonical "blocking BitTorrent" question

    - by Aphex5
    How can one block, or severely slow down, BitTorrent and similar peer-to-peer (P2P) services on one's small home/office network? In searching Server Fault I wasn't able to find a question that served as a rallying point for the best technical ideas on this. The existing questions are all about specific situations, and the dominant answers are social/legal in nature. Those are valid approaches, but a purely technical discussion would be useful to a lot of people, I suspect. Let's assume that you don't have access to the machines on the network. With encryption use increasing in P2P traffic, it seems like stateful packet inspection is becoming a less workable solution. One idea that seems to make sense to me is simply throttling down heavy users by IP, regardless of what they're sending or receiving -- but it doesn't seem many routers support that functionality at the moment. What's your preferred method to throttle P2P/BitTorrent traffic? My apologies if this is a dupe.

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  • Route an IP from WAN to a host on LAN on OpenWRT

    - by Zsub
    EDIT: I know how to use NAT, I specifically want the server to be reachable on two IP's, one private, one public, with the firewall of the OpenWRT in between, if feasible. At the office we have recieved a /29 from our ISP. The first address is reserved for their endpoint, so I'm free to use five addresses. We run a local network, so of course there is a router in between running OpenWRT to provide all hosts with (W)LAN (dhcp from a private range). However, we also have a server running OS X Server 10.6 (Snow Leopard) and I'd like that server to be accessible both from the LAN using a private IP as well as from the WAN on it's own public IP. Point of note is that the server only has one network port, so multiple NICs is not an option, unfortunately. How would I go about doing this?

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  • How do I set zone priority in Microsoft DNS?

    - by Justin
    I have a standard small network setup (20 users) on Active Directory. All Windows machines have a primary DNS server as the AD and a secondary DNS server as Google PDNS. I want to setup a DNS entry that exists in real DNS but set it up on our DC so that local requests would route this public domain to a local development machine on the network. I setup the zone in DNS which results in the clients resolving the public FQDN to our internal IP. However, sometimes it still resolves to the "real" value (I check by pinging it). Is there some way to give the zone definition in my DC DNS higher priority? Or will the client that has secondary public DNS always at sometimes have a competing entry for this zone?

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  • Remote Access to Owncloud Server

    - by John
    I'm currently trying to setup my own own-cloud server, and I've got it fully installed, configured, and accessible from within my own local network. I cannot figure out how to access it from the outside. So far I've: Successfully setup port-forwarding on my local router. I've done so via 'single port forwarding' and 'port range forwarding' Ports 80, 443, 3306 (Apache-Full and MySQL) Successfully obtained my external IP address. I've also tested this magic number from within the network at #insertIPhere/owncloud and it did work. Successfully setup the server using SQLite Successfully setup the server using MySQL Created the following exceptions in my firewall: Allow In Port 80 (Apache Full) Allow In Port 443 (Apache Full) Allow In Port 3306 (MySQL) Tried connecting from several different remote networks, as to troubleshoot something on their end As far as trying to access it, I'm doing so through Google-Chrome and Mozilla Firefox trying to reach the server through #insertIPhere/owncloud using the above public IP address. So what have I missed, and how do I access my server from outside? Thanks in advance for your help and time, and I apologize in advance for what will probably result in my noobish mistake in networking. I've looked at the official documentation. And also this question here.

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