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• Very low throughput on 10GbE network

  - by aix

  I have two Linux machines, each equipped with a Solarflare SFN5122F 10GbE NIC. The two NICs are connected together with an SFP+ Direct Attach cable. I am using netperf to measure TCP throughput between the two machines. On one box, I run: netserver and on the other: netperf -t TCP_STREAM -H 192.168.x.x -- -m 32768 I get: MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.x.x (192.168.x.x) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 32768 10.02 1321.34 The measured throughput is 1.3Gb/s. This is 7.5x below the theoretical maximum, and only 30% faster than 1GbE. What steps can I take to troubleshoot this?

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• Configure Windows Routes for VPN

  - by Florin Sabau

  I have a Virtual PC/VMWare machine that runs Windows Server 2003. This virtual machine uses an IPSec VPN client program to connect to a remote network. I configured the virtual machine to have 2 NICs: NAT - to be used by the VPN Client to access the remote network Host only - to be able to access the virtual machine from the host The reason I have this setup is because I want to be able to access some remote network from the host machine. I could've installed the VPN client on the host machine, but the host runs Windows 7 and the client doesn't support it. The problem: although the virtual machine is normally reachable (ping + http access), as soon as the VPN client is started, neither of the NIC addresses are reachable anymore. I'm wondering if it is a routing problem that needs to be addressed? How do routing/VPN client connection affect the ability of the server to respond to client requests from the host?

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• RTL8168B/8111B Lan card is not detected in RHEL5.1..Not finding Lan card driver for this particular

  - by Deepak Narwal

  Hello friends... In My computer Lan card model is Realtek RTL8168B/8111B PCI-E GIGABIT ETHERNET NIC (NDIS 6.20) My system is dual boot windows 7 and redhat 5.1 Now windows 7 automatically detected this lan card but in redhat lan card is not detected.I have tried to through evrywhere like network or through neat-tui but it is not showing lan card.. I tried google also but all of them providing windows software for this lan card . So please anyone can tell me the link so that i can download drivers for this and can use internet there.. Thanks a lot in advance Deepak Narwal

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• Multiple Subnets on home network... would this work?

  - by rockinthesixstring

  We are looking at renting out the basement suit in our home and want to offer internet as part of the package. I however do not want the downstairs tennent to have access to our network (home office = private data). We currently have a pfsense firewall as our gateway and a Windows Server 2003 box is doing our primary DHCP (192.168.0.0/24) and DNS. Here's what I'd like to do... I'd like to setup another subnet on the DHCP server (192.168.1.0/24), and hook in another wireless router (as access point only) and address it as 192.168.1.1... from there the router will hook into our primary switch and then out through the firewall. Will Server 2003 (If I add a 192.168.1.x/24 IP to the nic) serve DHCP to the devices that connect to the new router, and will it isolate that from our network? Thanks in advance... I'm very new to multiple subnets.

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• How to query a DHCP server to get the local DNS serves

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a)reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b)calling their T/S (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• How to query a DHCP server to get the local DNS serves

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a)reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b)calling their T/S (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• Ubuntu Server 12.04 as a router. Problem with DNS

  - by Lorenzo

  I have a virtualbox lab made up of 4 Windows 2008 R2 servers (DC/DNS,SQL,SHAREPOINT, EXCHANGE) that are configured with static ip addresses with NIC's attached to Internal network. Everything works. I had the requirement to execute some tests that also access external services available on the internet. To keep things clean and similar to the production environment I have installed another VM, with Ubuntu Server 12.04 64 bit and configured (I hope) to work as a router like described on this post. This VM has two network interfaces: first is Bridged with the host and is used as a WAN connection and the other one attached in the Internal Network with its own static IP address on the internal network subnet. But actually the Windows servers does not connect to the internet while the unix one connects. I did a route command. this is the result: Kernel IP Routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 10.69.121.1 0.0.0.0 UG 100 0 0 eth0 10.69.121.0 * 255.255.255.0 U 0 0 0 eth0 192.168.83.0 * 255.255.255.0 U 0 0 0 eth1 Can somebody help me with this configuration? :) Thanks! Addendum: I forgot to mention that one of the windows server hosts a DNS service for which I should maybe configure a forwarding server but I do not exactly know which server to forward on... :(

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• RTL8168B/8111B Lan card is not detected in Redhat..Error is make ***/lib/modules/2.6.18-53.e15/build

  - by Deepak Narwal

  0 Hello friends... In My computer Lan card model is Realtek RTL8168B/8111B PCI-E GIGABIT ETHERNET NIC (NDIS 6.20) My system is dual boot windows 7 and redhat 5.1.Redhat is not picking up this model of Lan card automaticlly. I tried it by downloading from realtak site for this particular model and find some .tar packages for my kernal and when i tried to install them ... check old drivers & unload it build the module and install make */lib/modules/2.6.18-53.e15/build: no such file or directory stop make[1]: *[modules] error 2 make : [modules] error 2 i downloaded tar files from sites and unpack according to their instrution i tried to run autorun.sh script as mentioned in readme file but after doing this it is showing above error... Now what to do i am not getting

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• HP Server bios boot delay

  - by jjrab

  I'm just going to throw this out there in case anyone else has run accross this... I have an HP DL320 G5p that had the motherboard replaced due to a faulty NIC port. After several calls to HP, two motherboard replacements, PCI riser card replacements, Processor replacement, and power supply replacement, the server takes approx. 10 minutes before it boots into the BIOS. It then boots up with no issues. We've run the HP smart start cd and performed the system tests and everything passed. All firmware has also been upgraded to the latest as well. Has anyone else seen this and found a fix? I am still working with HP, but there seems to be a struggle on their part to figure this out, so I'm curious to know if anyone else has experienced this and found a fix - thanks...

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• How to tell Windows 7 to ignore a default gateway

  - by zildjohn01

  I currently have 2 network cards in my PC -- one connected to an internal network on a router with a disconnected WAN port (10.x.x.x), and one connected to the internet through a consumer router (192.168.0.x). Windows seems to recognize them correctly (my "Network and Sharing Center" lists them as "No Internet" and "Internet" respectively), however when I try browsing the internet it always tries the internal network's default gateway, rather than the one with internet access. Trying to ping a website results in "Reply from 10.0.0.1: Destination net unreachable.". A simple "route delete 0.0.0.0 mask 0.0.0.0 10.0.0.1" fixes the problems, but they return upon reboot, or upon renewing my IP. Is there any way to tell Windows to ignore one NIC's default gateway, or to at least give them priorities?

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• Windows XP periodically disconnects, reconnects; Windows 7 doesn't

  - by einpoklum

  My setup: I have a PC with a Gigabyte GA-MA78S2H motherboard (Realtek Gigabit wired Ethernet on-board). I have the latest drivers (at least the latest driver for the NIC. I'm connecting via an Edimax BR-6216Mg (again, wired connection). For some reason I experience short periodic disconnects and reconnects. Specifically, Skype disconnects, tries to connect, succeeds after a short while; incoming SFTP sessions get dropped; using a browser, I sometime get stuck in the DNS lookup or connection to the website and a page won't load. A couple of seconds later, a reload works. All this happens with Windows XP SP3. With Windows 7, it doesn't happen. The connection is smooth (OS is sluggish though, but never mind that). Like I said, I updated the NIC driver. I tried reducing the MTU (used something called Dr. TCP), thinking maybe that would help, but it didn't. (I'm a bit but not super-knowledgeable about TCP parameters.) I'm guessing it's either a problem with the driver or some settings which are different between the two OSes. ipconfig for my adapter: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller Physical Address. . . . . . . . . : 00-1D-7D-E9-72-9E Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.0.2 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.0.254 DHCP Server . . . . . . . . . . . : 192.168.0.254 DNS Servers . . . . . . . . . . . : 192.117.235.235 62.219.186.7 Lease Obtained. . . . . . . . . . : Saturday, March 10, 2012 8:28:20 AM Lease Expires . . . . . . . . . . : Friday, January 26, 1906 2:00:04 AM

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• How to use Ralink RT2501/RT2573 as wifi access point in Debian Linux

  - by user60813

  Hi, I have a fit-PC server with Debian GNU/Linux (Lenny). I would like to use it as a wifi access point since my Linksys WRT54GS has become unstable. I have a USB Ralink wifi NIC. When I insert the card to USB I can see this with lsusb: Bus 001 Device 002: ID 148f:2573 Ralink Technology, Corp. RT2501/RT2573 Wireless Adapter I have tried following various HOWTOs on using wifi card as AP in Linux, however, it seems that the card cannot go into monitor mode. I believe this is because I must use a newer driver or upload non-free firmware or something like that. I have tried installed wicd, but it does not help. I bought this wifi adapter because I was told that it is one of the most common used Linux supported wifi cards that can be used as access point and a lot of other stuff. So my question is: How do I set up this USB wifi card as wireless access point in Debian Lenny?

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• Windows Home Server backup recovery missing driver for USB Device

  - by Pat James

  I'm doing a backup recovery of a Windows 7 PC from the backup on Windows Home Server. I've done this before and am accustomed to the prompt to load drivers for devices such as the NIC from a USB flash drive, which I have all loaded up with the drivers from the special folder in the WHS backup repository for this PC. My problem on this PC is that one of the drivers the recovery CD complains is missing is "USB Device", and it fails to find the drivers when I click the button to scan for and install drivers. So it seems it can't access the USB flash drive to load the other drivers. Any suggestions? I think my next step is to pull a DVD drive from another system and plug it in with a CD burned with the device drivers.

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• Server-to-Switch Trunking in Procurve switch, what does this mean?

  - by MattUebel

  I am looking to set up switch redundancy in a new datacenter environment. IEEE 802.3ad seems to be the go-to concept on this, at least when paired with a technology that gets around the "single switch" limitation for the link aggregation. Looking through the brochure for a procurve switch I see: Server-to-Switch Distributed Trunking, which allows a server to connect to two switches with one logical trunk; increases resiliency and enables load sharing in virtualized data centers http://www.procurve.com/docs/products/brochures/5400_3500%20Product%20Brochure4AA0-4236ENW.pdf I am trying to figure out how this relates to the 802.3a standard, as it seems that it would give me what I want (one server has 2 nics, each of which is connected to separate switches, together forming a single logical nic which would provide the happy redundancy we want), but I guess I am looking for someone familiar with this concept and could add to it.

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• IP Forwarding and Routing in Windows 2008

  - by Danialzo

  I have Hyper-V running on a windows 2008. I got a new ip stack from the data center to be set on my virtual machines. But I have difficulties to set these IPs on my VMs because they are on different network. my current server ip is xxx.xxx.18.6 with MASK : 255.255.255.224 and the GW is xxx.xxx.18.1 my new ip stack is xxx.xxx.168.176/29 I can use RRAS to achieve this. Do I need to create another NIC? How do I make these VMs reachable from outside?

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• 12.04 Wi-Fi not working correctly with Intel Pro/Wireless 3945ABG

  - by Jerel

  This is a very strange problem. The only time the Wi-Fi works is when I have the wired connection connected. I have a Dell 6400/e1505 with the Broadcom BCM 4401-B0 internal NIC, and the Intel Pro/Wireless 3945ABG Wi-Fi adapter. I was on 10.0.4 LTS before, and I remember having to screw around to get the Wi-Fi to work, but that was years ago, and now it's acting even stranger than it did back then. If I boot up with the wire connected, the Wi-Fi starts up. If I boot up without the wire connected, the Wi-Fi won't start at all. If after booting with the wire connected, and the Wi-Fi starts up, I then disable the wireless, the wired connection works fine. Without the wire connected, dmesg shows the iwl3945 driver loading and starting with no errors, and the wireless adapter activated. Running rfkill list shows no blocks, but there is no connection to my Wi-Fi. Help! I am more confused than a chameleon in a bag of Skittles.

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• Most efficient Way to setup a game server

  - by alex bowers

  I'm running a PHP based game which has over 45 Million members predicted for end of this year (2011) Currently we are on 7.5 Million, this game is being ran on facebook and I am in desperate need to help get this game server as efficient and as powerful as possible. it is a dedicated server with Processor Manufacturer Intel Model i7 920 Frequency 4x 2x 2.66 GHz NIC GigaEthernet RAM 12 GB Hard disk 4 x 1 TB specs. It has apache installed, cPanel, phpMyAdmin, several apache mods and MySQL. The game also runs 47 mysql calls per second per user. Is there any alternatives to the above which could be faster, more efficient etc? I dont mind having to recode the game to fit to it, as long as it maximises our upper limit of members on the game. Thanks Also, is there a way to tell what our maximum limit to players, database calls etc is? Thank you again, hope you guys can help :)

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• NLB RPC server is unavailable on the specified computer

  - by Robin Weston

  Hi guys, Firstly, I'll admit that my networking knowledge is limited so as people request more information I'll update this question accordingly. I am trying to create a NLB Cluster across 2 Windows Server 2008 Web Servers. Neither of the machines are members of a domain, and both have 2 NICs (one for processing external web traffic, and one for communicating internally). I have installed NLB on both machines, and have created a cluster on Host A and added itself to it. However, when I try and add Host B (using the address from the external NIC) I get the following error : "The RPC server is unavailable on the specified computer". On Host B I can see that the RPC service is running fine. I can also ping and RDP from Host A to Host B with no problems either. I have disabled the windows firewall on both machines but that had no effect

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• MaaS minimum requirements with juju-jitsu?

  - by Christopher Shen Mu Long

  I've browsed through so many different sites and found so much contradictory information. As I am getting tired of this and do belive this question affects many other users, so I would like to collect the "once and for all times" answer. Unfortunately, the documentation on MaaS and Juju is ... well, not the best, sorry to say that. What are the minimum system requirements for setting up a MaaS cluster, which is going to be orchestrated with juju-jitsu? Do they need to have the exact system specifications or can I just combine different hardware? What are the minimum requirements for the master machine? E.g. "You need at least 8GB of RAM, a dual core CPU with at least 3.0 GHz." How many machines to I need to deploy MaaS on? I've read six machines, nine machines, and so on. I clearly want to know: "You need one for the Master and e.g. five nodes." Do I need to attach as many NICs (network interface cards) to my master machine as there are nodes, or can I simply attach two NICs and a switch? One NIC for connecting to the internet, one for handling the MaaS tasks, connected to a switch, which connects my nodes to the master? Is Juju now ready for local deployment? The last time I experimented with juju and had to reboot my machine, the services orchestrated by juju were gone. This was an issue I also found on the official juju site. Unfortunately, as mentioned above, the documentation is not the best, so I could not find the necessary info on that again. So: Can I use juju on a local environment or will a reboot break my setup?

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• Nginx Static Content Server Maxing Out?

  - by Harry

  I use nginx to serve the static content for a decently busy website of mine. I have the logging disabled, and 4 worker processes enabled with 5,000 connections per worker (which should yield a max connection limit of 20,000. The server is only operating at about 10% CPU usage and 50% ram, but it's very laggy, and sometimes nginx is so slow to respond to the requests, it times out. For a small number of connections, it's fine, but once any load starts occurring (~2,500 connections), it backs up and bogs down. Is there any other bottlenecks or limits that I might be hitting? This is a FreeBSD server, and all the static files are located locally (not NFS). The NIC is an unmetered gigabit, and it's only using around 75 megabit. Any insight would be appreciated. Thanks.

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• APIPA ip address in server 2003 dns for (same as parent folder record) can anyone suggest why this i

  - by dasko

  have a server 2003 domain controller i have installed active directory integrated dns under the forward lookup zone for domain_name.local i see an APIPA ip address that is set for (same as parent folder) with ip number 169.x.x.x looks like (same as parent folder) Host A 169.x.x.x (apipa subnet range) problem is, from other forums that i have read, that this is due to dual nics and one on that is not getting a dynamic or static ip address BUT... I only have one nic in this server? where could this be coming from and could it mess up other settings or not allowing the DC to be contacted? i am just wondering what symptoms could arise due to the record being there. any help would be greatly appreciated thanks.

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• Configure Windows Routes for VPN

  - by Florin Sabau

  I have a Virtual PC/VMWare machine that runs Windows Server 2003. This virtual machine uses an IPSec VPN client program to connect to a remote network. I configured the virtual machine to have 2 NICs: NAT - to be used by the VPN Client to access the remote network Host only - to be able to access the virtual machine from the host The reason I have this setup is because I want to be able to access some remote network from the host machine. I could've installed the VPN client on the host machine, but the host runs Windows 7 and the client doesn't support it. The problem: although the virtual machine is normally reachable (ping + http access), as soon as the VPN client is started, neither of the NIC addresses are reachable anymore. I'm wondering if it is a routing problem that needs to be addressed? How do routing/VPN client connection affect the ability of the server to respond to client requests from the host?

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• How to test KVM guest CPU maximum allocation limit?

  - by Ace

  Running Ubuntu 13.04 Host and vm Guest. Using virtio for hdd, nic. Max-allocaion CPU cores is 6, minimum is 2. Ive made a vm with virt-manager just to play with, and to test out kvm. Alright, I have a decent understand how the memory balloon driver works, but I still dont know how to test if the guest OS can utilize the max setting for cpu cores. From what i gather, the host will start one thread of qemu for each core allocated per vm. When i run htop inside the guest, it only shows two cores. (also here is the output of cat /proc/cpuinfo: https://gist.github.com/anonymous/93a361545130923537da ) How can I "force" the guest to allocate the other 4 cores so that it can show 6 cores in htop? Is there a way to do this?

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• How to make a DHCP server on virtual machine serves other virtual machines(on different physical machines)?

  - by Tony

  I'm building a virtual cluster with VirtualBox and Opensuse. I have 10 physical machines and need several vms on each. The virtual machines are supposed to be in a "private" network, but still have internet access. I was asked to set up a virtual head node working as DHCP server. I installed DHCP server on the virtual head node and it seems works. On VirtualBox I set 2 network adapters to the head node, one bridged adapter and one internal network. One vm on the same physical machine has been set nic as internal network adapter. The vm can get IP address (so DHCP works) but can't access internet. What should I do? Specifically, what network adapter should I choose for head-node and work-nodes in VirtualBox? What in the virtual machines should I do?

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• Iptables based router inside KVM virtual machine

  - by Anton

  I have KVM virtual machine (CentOS 6.2 x64), it has 2 NIC: eth0 - real external IP 1.2.3.4 (simplified example instead of real one) eth1 - local internal IP 172.16.0.1 Now I'm trying to make port mapping 1.2.3.4:80 = 172.16.0.2:80 Current iptables rules: # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE -A PREROUTING -p tcp -m tcp -d 1.2.3.4 --dport 80 -j DNAT --to-destination 172.16.0.2:80 COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *mangle :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 But there is nothing works, I mean it does not forwards that port. Similar configuration without virtualization seems to be working. What am I missing? Thanks!

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