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• Should I consolidate multiple identical VMs into BSD jails?

  - by Josh

  We run a number of Openfire XMPP/Jabber servers. Due to the way Openfire works, we cannot easily run multiple Openfire instances on one server, so I have 5 identical VMware ESXi VMs, each with CentOS, MySQl, Java, and Openfire. They're the exact same, except for their IP addresses, the actual Openfire MySQL database and it's config file. I am wondering if this is the optimal configuration, or if it would be better to move these VMs to a single FreeBSD machine and put each one inside a FreeBSD jail. Specifically, I am wondering if the benefit of VMWare's Transparent Page Sharing (TPS) would outweight the cost of running 5 identical OSes. Would I end up using less memory with one large FreeBSD machine and java running in bsd jails?

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• How to setup and manage a shared hosting server on Windows Server 2008 R2 Web Edition?

  - by Motivated Student

  Background I am a newbie in using Windows Server 2008 R2 Web Edition (and other editions as well). I have a static IP, a very fast internet connection, a server (PRIMERGY TX100 S1 Server) and Windows Server 2008 R2 Web Edition (trial version). The objective is to setup the server to be a shared hosting server such that each of my friends has a private account to manage his/her domain. to upload his/her web content to the server using the encrypted ftp. to manage database administration. to manage Certificate. etc Questions Is there a good reference to learn "how to setup and manage a shared hosting server on Windows Server 2008 R2" ? What are the rough steps I have to do to accomplish my objective?

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• Domain connection shows as "unauthenticated"

  - by gareth89

  I have seen various different questions for this problem floating around but either the circumstances arent the same or the solution doesnt work so thought i would post it to see if anybody has any suggestions. Various domain PCs and laptops appear to randomly give the connection name of "lewis.local 2(Unauthenticated)" - lewis.local being our domain - and provides an exclamation mark where the network type logo is normally shown. This also appears to happen every time connecting via vpn. Our setup is: 2 servers both running windows server 2003 R2 (x32) main server has AD, DNS and DHCP installed IPv4 on approx 30 client machines (some wired, some wireless) If anybody has any thoughts on solutions i would appreciate it. I have tried removing all but AD server roles, resetting all of the systems and nothing. It doesnt prevent anything from working just like a domain connection most of the time however it is getting fustrating! Also dont know if it could have anything to do with it but the DHCP server seems to have quite a long lead time on issuing the IP address to the client.

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• Bridge virtual machines out WLAN interface

  - by Thomas

  It seems that my wlan card (intel 5100 AGN) firmware doesn't allow "spoofing" MAC addresses. This has the side effect of destroying the capability to bridge out my virtual machines on that interface. Apparently this is a common thing on wlan cards. I can see the incoming traffic just fine in my virtual machines, but their DHCP queries don't get bridged out of the WLAN card. It works perfectly well when using the wired ethernet port. Is there a workaround for this? MAC-NAT or something? I don't want to route my virtual machines out to the Internet because I don't want my host OS to even have an IP address. I'm using Linux and KVM for virtualization.

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• Windows server 2008 rejecting packets from client

  - by l46kok

  We deployed a server application in .NET 4.0 that is going to run on Windows Server 2008 R2. Strangely, the clients cannot connect to the server given an external IP and the server port. I've ran wireshark diagnostics on the server computer and verified that the packets are arriving to the NIC without any issue so it seems Windows Server 2008 is the culprit here. I've tried to temporarily disable the firewall and add the server port into inbound/outbound rule but it still doesn't solve the issue. How can I solve this issue?

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• DHCP over WiFi on CentOS 6 [closed]

  - by dongle26

  Using CentOS 6 I cannot get my WiFi interface to configure over DHCP. Here is my ifcfg-wlan0: This does not work (although it is correct): DEVICE=wlan0 BOOTPROTO=dhcp ONBOOT=yes HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless This works: DEVICE=wlan0 BOOTPROTO=none ONBOOT=yes IPADDR=192.168.0.253 NETMASK=255.255.255.0 DNS1=192.168.0.99 GATEWAY=192.168.0.99 HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless I don't want a static IP address, I want a DHCP assigned address. Update: Both of the above configs are correct. Please don't downvote, this really didn't work for me. It must be a bug in CentOS or my wireless driver. See my answer for details.

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• securing source code with bitlocker

  - by Daniel Powell

  We need to deploy a web based application at a client site where it will be within their local intranet. Part of our requirement is to provide some basic security to protect our IP. I realise that nothings a 100% guaranteed fix but we are just looking to make it a bit harder for most people. The server will be running server 2008 and I was considering using bitlocker as a cheap and nasty way to protect it. From what I understand assuming the mobo supports it we can use the Transparent bitlocker mode and this means that moving the hdd to another pc will mean the hdd will be unreadable in that machine baring some sort of cold boot attack to steal the encryption keys. Is this assumption correct and in the case that the motherboard or any other component fails in the pc and we need to replace it do we lose access to our data or is there a way to unencrypt it (obviously accessible to only our company) EDIT: we do have legal documents that cover this and we will be locking the pc physically and the client will not have access to the pc (windows login) other than via the website we host on it

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• Missing eth0 configuration file

  - by Godric Seer

  I have two servers both running Scientific Linux 6 on the same network. Since I want SSH access to both of them, I want to give them both static IPs so I can setup port forwarding and not worry how my router assigns local IPs. I found that I need to edit the configuration file /etc/network-scripts/ifcng-eth0, however that file does not exist. The network card works fine, and I am able to ssh as long as I access the router and find the local ip. Can I simply make my own configuration file, or did I miss some step in configuring the system that I need to complete?

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• How to install NPM behind authentication proxy on Windows?

  - by Tobias

  I need to run the latest version of Node and NPM on Windows. I installed Node 0.5.8 and downloaded the sources of NPM from GitHub. The steps I followed to install NPM were listed on its GitHub site but I have a problem running the following command: node cli.js install npm -gf but it fails with the following error message: Error: connect UNKNOWN at errnoException (net_uv.js:566:11) at Object.afterConnect [as oncomplete] (net_uv.js:557:18) System Windows_NT 5.1.2600 command "...\\Node\\bin\\node.exe" "...\\npm\\cli.js" "install" "npm" "-gf" cwd ...\npm node -v v0.5.8 npm -v 1.0.94 code UNKNOWN I think that this is a problem because I need authentication at my proxy to connect to the Internet. But I found no way to tell the installer to use my credentials for login. Is there a possibility to provide my proxy IP and login information to npm installation maybe via command-line arguments? I can provide the full log (but seems to have no more relevant information) using pastebin if needed.

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• How to protect ejabberd from bruteforce attacks?

  - by Sergey

  It writes this in logs: =INFO REPORT==== 2012-03-14 17:48:54 === I(<0.467.0>:ejabberd_listener:281) : (#Port<0.4384>) Accepted connection {{10,254,239,2},51986} -> {{10,254,239,1},5222} =INFO REPORT==== 2012-03-14 17:48:54 === I(<0.1308.0>:ejabberd_c2s:784) : ({socket_state,tls,{tlssock,#Port<0.4384>,#Port<0.4386>},<0.1307.0>}) Failed authentication for USERNAME =INFO REPORT==== 2012-03-14 17:48:54 === I(<0.1308.0>:ejabberd_c2s:649) : ({socket_state,tls,{tlssock,#Port<0.4384>,#Port<0.4386>},<0.1307.0>}) Failed authentication for USERNAME It doesn't write IP with a failure. And strings "Accepted connection" and "Failed auth.." may even not stand nearby (as I think on heavily loaded servers) to be able to use fail2ban. What to do? And how jabber servers (using ejabberd) are protected?

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• Cannot connect to Musicbrainz VirtualBox through SSH using Mac

  - by olovholm

  I am trying to connect my mac terminal shell to a VirtualBox running the Musicbrainz server. I have configured the network through a BridgeAdapter and running ifconfig on both the host and the guest show corresponding IP addresses. I can now ping the guest, but I cannot connect through SSH. The verbose output from the SSH client on my mac states: (olaenv)hf-79-202:Python oclovhol$ ssh -vv [email protected] OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to 127.0.0.1 [127.0.0.1] port 22. debug1: Connection established. debug1: identity file /Users/oclovhol/.ssh/id_rsa type -1 debug1: identity file /Users/oclovhol/.ssh/id_rsa-cert type -1 debug1: identity file /Users/oclovhol/.ssh/id_dsa type -1 debug1: identity file /Users/oclovhol/.ssh/id_dsa-cert type -1 ssh_exchange_identification: Connection closed by remote host

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• is my ddclient conf right ?

  - by Luc

  Hello, I bought my domain.tld and like to have it points toward my home server. I then created a zoneedit account and setted the zoneedit dns in my domain setting in my registrar web interface. I then installed ddclient on a machine behind my router, with the following conf: Configuration file for ddclient generated by debconf # /etc/ddclient.conf protocol=zoneedit1 use=if, if=eth0 server=www.zoneedit.com login=my_zoneedit_login password=my_zone_edit_password domain.tld When I open a browser and check http://domain.tld I have a site under contruction (from registrar dotsterparking). Is my ddclient conf correct ? Where can I find the errors (while updating my IP) if any ? Thanks a lot, Luc

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• Where to begin with IPv6 [closed]

  - by Willem de Vries

  I am fairly familiar with setting-up IPv4 networks for bigger server configurations, only now I wanted to start familiarizing myself with doing the same for IPv6. I have been Googling for the second night in a row for things like: IPv6 network design, IPv6 for dummies, etc. So far most things you find go on about why IPv6 and the amazing amount of numbers that we have now. Yet I am looking for practical stuff, for example: what would be a good way to assign IP-number, as I understand it DHCP shouldn't be the default course of action. How do other assignment methods work with DNS configuration? what would be a good or standard way of dividing the network in to sub-nets? (database, application, web servers spread over multiple domains/applications and some what intertwined) In short I would like to find good resources with practical information books, webpages, etc.

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• iptables: How to read this OPT string?

  - by alex

  I have a simple INPUT rule for iptables that logs any new connections to a logfile. --log-tcp-options and --log-ip-options flags are both set and I get the appropriate OPT output. One line of my log looks something like this: Nov 29 17:00:00 IN=venet0 OUT= MAC= SRC=x.x.x.x DST=x.x.x.x LEN=64 TOS=0x00 PREC=0x00 TTL=53 ID=37898 DF PROTO=TCP SPT=57755 DPT=8888 WINDOW=65535 RES=0x00 SYN URGP=0 OPT (0204057D010303010101080A3E521D4D0000000004020000) I would like to understand how to interpret the OPT string (bold). Is there some documentation available on what it actually means? How could I make it human-readable?

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• Strategies for very fast delivery of webpages.

  - by Cherian

  I run a website Cucumbertown with an initial pay load of nearly 9KB zipped. All my js is delayed loaded with requirejs and modernizer is the only exception. Now all my webpages are Nginx cached and only 10-15% hits go to the backend proxy. And the cache is invalidated by logged in users as proxy_cache_bypass. So for an anonymous user its nearly always a cache hit. I have some basic OS tuning with default via ip dev eth0 initcwnd 15 net.ipv4.tcp_slow_start_after_idle 0 Despite an all cache & large initcwnd my pages still take 2.5 – 3 seconds. I have a yslow score of And page speed at Are there strategies that can help deliver webpages even faster than this? Deliver pages at 1+ second time for 10KB payload? Notes: My servers run of a fairly good data center from Linode at Fremont.

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• cassandra node discovery

  - by eQuiNoX__

  I just set up a 3 node system with ip addresses "192.168.0.101", "192.168.0.102", "192.168.0.103". I have set the seeds value on the configuration of all three machines as seeds: "192.168.0.101,192.168.0.102,192.168.0.103" However, on running nodetool on any of them, only the 103 machine gets discovered. node101:/opt/cassandra/apache-cassandra-0.8.5/bin# ./nodetool ring -h 192.168.0.101 Address DC Rack Status State Load Owns Token 192.168.0.103 datacenter1 rack1 Up Normal 151.96 KB 100.00% 38174485210079977599903748344879358256 Could someone tell me where the problem lies?

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• After low level formatting can microsoft track previously pirated windows installed on pc

  - by Neelabh

  I am getting call from Microsoft and they are forcing me to purchase so many licensed software but my budget is not that much.. So they are asking for On-Site Audit (SAM Review)... So I did low level formatting of my All PC's and Installed Ubuntu. So can they track I installed pirated windows xp earlier on these system or I need to change hardware.. After formatting on what parameter Microsoft Track earlier piracy: 1) By any Harddisk ID 2) By any Motherboard ID 3) By any IP Address Please help me otherwise I have to borrow so much money for licensing fee. Thanks in Advance..

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• Slow internet using Arch Linux

  - by GZaidman

  after a week or so of using Arch Linux I cant access the internet - it takes around 5 mins to load google (most of the other websites just give me a timeout), pacman's downloading speed range between 5-2Kbs, and pinging google takes around 9Kms. I'm connected using wireless network (wifi card is Intel Ultimate 6300 and router is Edimax 6524n). Every other Windows machine that's connected to the network (and even the T410 running Windows) is fine, so the problem lies in Linux. So far, i checked the resolv.conf file (my router ip address is listed), and the hosts file (pretty much default), and I disabled the ipv6 module. None of that helped. PS: i'm using NetworkManager (but the problem still occurs when connecting using wicd) running on Gnome3. Thanks in advance for any help you can provide! EDIT: something really strange happens whenever I ping google: i get an unknown host 'google.com', but the bit rate from the card jumps at the exact second I ping google (so far, the bit rate jumped to 54Mb/s from 1Mb/s over the course of 4 pings).

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• DNS resolution over DHCP

  - by Eric

  I have a m0n0wall router a VMWare workstation running ubuntu a windows 7 workstation running the VM The ubuntu hostname is "renraku" From the windows machine I can't resolve dns automatically for this host. For example, when I ping renraku Ping request could not find host renraku. Please check the name and try again. However nslookup seems to work nslookup renraku Server: m0n0wall.local Address: 192.168.123.254 Name: renraku Address: 192.168.123.248 I don't get how to have ping to work with hostnames. The main goal behind this is to have my web server to work with hostnames instead of ip addresses EDIT : ping 192.168.123.248 works

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• Cyrus: authentication failure: checkpass failed

  - by Nick

  I'm trying to get Cyrus IMAP (v 2.2 on Ubuntu 9.04) setup and working, but I'm having a bit of trouble getting the login working correctly. I've created a mailbox for my test user "nrahl": cm user/nrahl and then created a password: $ saslpasswd2 nrahl I'm attempting to connect to the mailbox using Thunderbird. I'm using the machine's LAN IP address as the host, and "nrahl" as the username. It connects to the server and prompts me for the password. When I enter it, I get "Login to server failed." in Thunderbird, and /var/log/mail.log shows: Apr 15 19:20:01 IMAP cyrus/imap[1930]: accepted connection Apr 15 19:20:09 IMAP cyrus/imap[1930]: badlogin: [192.168.5.21] plaintext nrahl SASL(-13): authentication failure: checkpass failed Part of /etc/imapd.conf with comments removed: sieveusehomedir: false sievedir: /var/spool/sieve #mailnotifier: zephyr #sievenotifier: zephyr #dracinterval: 0 #drachost: localhost hashimapspool: true allowplaintext: yes sasl_mech_list: PLAIN #allowapop: no #sasl_maximum_layer: 256 #loginrealms: example.com #virtdomains: userid #defaultdomain: sasl_pwcheck_method: saslauthd #sasl_auxprop_plugin: sasldb sasl_auto_transition: no

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• nameservers one domain one VPS and one VMCloud

  - by Dave

  I 'had' just a single VPS with nameservers ns1 & ns2.mydomain.com. I've now taken a VMCloud package as I need space etc. Ultimately I will carefully transfer all accounts from my VPS to Cloud but in the short term I'm running both. In the new WHM on Cloud I have set hostname bla.domian nameservers as ns3 & ns4.mydomain.com with the two new ip addresses. Question is do I need to do anything else - eg where mydomain.com is registered? I want ns1 & 2 point to VPS and ns3 & 4 to point to Cloud.

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• How do I connect to my wireless router settings on Linux?

  - by Joshua Robison

  My network is as follows: Internet Provider's DSL modem connected to Internet Provider's router connected to My Buffalo Wireless router connected to My Toshiba Laptop via WEP network My Toshiba Laptop is running LMDE Linux Mint Debian Edition Service Pack 3 i686 kernel I have experience using various routers and their configuration settings but for some reason I can not access my wireless router. In my cromium browser I tried the following ip addresses: Standard Usual IPs : 192.168.1.1, 192.168.0.1 (connection hangs and goes no where) On the back of my router: 192.168.11.1, 192.168.11.100 (connection hangs and goes nowhere ) In some tcpip info: 192.168.24.1 (unable to connect error message) If someone could give me some terminal commands that will help me find my wireless router address or some trouble shooting ideas, I would be very thankful.

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• Failed pinging a LAN card of the server from the client using shared internet connection

  - by bobo

  The server (Windows XP Pro SP3) has two LAN cards (LAN card A and B) and is connected to the internet using ADSL. The ADSL connection is shared to LAN card B using Internet Connection Sharing. The client (Windows XP Pro SP3) has one LAN card, and is connected to LAN card B of the server so that it has access to the internet. The IP address on the LAN cards are defined as follows: Server: LAN card A: 192.168.0.3/24 (manually defined by me) LAN card B: 192.168.0.1/24 (manually defined by Internet Connection Sharing) Client: LAN card: 192.168.0.123/24 (assigned by DHCP) Default gateway: 192.168.0.1 From the server, I can ping 192.168.0.123 successfully. From the client, it can access the internet without any problem. I can also ping 192.168.0.1 successfully but for 192.168.0.3, it failed with the Request Timeout error message. Why did the ping fail, and what should be done to make the ping possible? (all firewalls have been turned off.)

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router.All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled.Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this and how do I fix it. Thanks Di

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• Round-Robin DNS in mobile networks

  - by k7k0

  After reading load distribution alternatives and giving my limited skills on the area I'm biased toward round-robin DNS strategy. From what I understood, one key aspect of DNS Round-Robin is setting a low TTL value, avoiding caching. My main concern is that all my traffic comes from mobile networks, almost 30% of that comes from t-mobile 3G. Some questions: 1) Is there a chance that almost all clients on the same mobile network will be redirected to the same IP in the TTL frame? That would kill the distribution technique. 2) If I choose a really low TTL (zero or one). That impacts directly over client performance? It does a DNS miss every time or it's a setting that only impacts on DNS servers? Any help would be much appreciated. Thanks

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