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• What's the best way to block IP spoofing on a layer 3 switch?

  - by toupeira

  We're hosting Dedicated Servers and are currently using old 3com switches with IP-based ACLs. So each port has an ACL that allows all IP addresses assigned to this customer, and blocks everything else. But now 3com was bought by HP, and the follow-up model only supports basic ACL that aren't flexible enough to both allow certain IPs while blocking others. Looking at other switches in a similar price-range, we've found that most of them have similar problems or don't offer any ACL features at all. I assume this could also somehow be done with VLANs, but if I understand this correctly we'd still need some kind of ACL to actually specify the valid IP addresses for each port. What do you use to make sure your customers don't use unassigned IP addresses? Or what switches can you recommend that have flexible ACL functionality?

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• An equivalent of IceCast but for Live Video Streaming ?

  - by Kedare

  Hello, I am looking for a solution to Stream live video like that : A camera/webcam/video output ---> Stream server ---> Clients And if possible multiple Stream Servers like this (like IceCast): A camera/webcam/video output --> Master Stream server +---> Slave Stream Server ---> Clients | `--> Clients | `--> Slave Stream Server ---> Clients `--> Clients The clients will be in flash, so I think RTMP should be a good protocol, I've heard of Red5, is it good for that ? Does it scale ? I would like to get statistics (Amount of clients, Bandwidth, etc), is it possible with red5 ? Do you know any other good solution to do that ? (Only free and if possible Open Source) Thank you !

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• Cheapest High Available Web Server [closed]

  - by xyz

  I would like to create a high-available setup (e.g. a small cluster) for a webserver, i.e. it will run Apache, PHP and MySQL. There will be between 2-8 small websites running with only very little traffic and workload. High availability is however very important. I don't want to be dependent on 1 datacenter, so there must be a minimum of 2 servers placed in different datacenters, and if one server goes down, the user must experience no or only a minimum of downtime - and no data loss. I have considered Amazon AWS using their Elastic Load Balancing, since it is possible to buy 2 EC2 instances in 2 availability zones and set up load balancing and RDS (Multi-AZ). However this seems rather expensive. Using the AWS price calculator http://calculator.s3.amazonaws.com/calc5.html it totals to 185$/month the first year (including the free tier). Are my calculations incorrect or is there a cheaper way to make this HA setup? Best regards

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• Ldap access lists users even if user has no rights...

  - by Patkos Csaba

  I am trying to set up a more complex Active Directory structure for some testing purposes. What I did so far: set up 2 windows (one 2008 and one 2003) to control the same domain set up an Organizational Unit (ou): Developers set up 2 child OUs: "one" and "two" each OU has it's admin: adminOne and adminTwo I denied all access to OU "two" by removing on the Security tab all the groups I don't want to access it. now, when I log in as adminOne and I try to click on OU "two" it says I don't have permissions to see the users and properties of "two" - this is perfect, it's what I want Here comes my problem: I do a LDAP query with the adminOne user on the "Developers" What I expect to happen: I expect to retrieve the users from Developer - One I expect to NOT be able to retrieve the users from Developers - Two What actually happens: ldap shows all the users, both from Developers - One and Developers - Two, even if the user should not have permissions to Developers - Two And now my question: is there any specific settings on Windows 2003 or 2008 Active Directory servers which allow or deny access over LDAP? I could not find any.

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• why do I get this mail server configuration error?

  - by Francesco

  <<The configuration of your mail servers and your DNS are not ok! The report of the test is: mail.mydomain.com. -> mydomain.com -> 78.47.63.148 -> static.148.63.47.78.clients.your-server.de Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server.>> I have a A Record that points mail.mydomain.com to 78.47.63.148 (which is my given ip address for my vps) All other records are fine, so what's wrong and what record should I create to make it right? Thanks

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• Dealing with SMTP invalid command attack

  - by mark

  One of our semi-busy mail servers (sendmail) has had a lot of inbound connections over the past few days from hosts that are issuing garbage commands. In the past two days: incoming smtp connections with invalid commands from 39,000 unique IPs the IPs come from various ranges all over the world, not just a few networks that I can block the mail server serves users throughout north america, so I can't just block connections from unknown IPs sample bad commands: http://pastebin.com/4QUsaTXT I am not sure what someone is trying to accomplish with this attack, besides annoy me. any ideas what this is about, or how to effectively deal with it?

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• Doesn't DNS diversity negatively affect performance? Why/how?

  - by cnst

  If you look at the press releases of various orgs that run the internet, you can see them praise the fact that now they run root server X in city Y, as if that magically makes everyone in city Y get all the relevant resolutions from the local server X, instead of going 200ms across the oceans and lands to other continents for resolutions. Similarly, the zones of some geographical domain names, like .ru, are being mirrored not just within Europe, but also, for example, in Hong Kong, which is no more, no less, but is about 300ms away from central Europe, since the traffic is often crossing the two oceans on each way. Doesn't all of this negatively affect DNS performance? Isn't it more of a liability to have a diverse pool of geodispersed authoritative servers, especially if your target audience is quite geographically concentrated? Perhaps a better question is, are there any DNS resolvers that use something better than the naive round-robin for choosing which authoritative server to contact?

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• Need to move a debian server from i686 to x86_64 architecture

  - by user64204

  I have a debian server that I need to move from one hosting provider to another. I don't really know how the old server was setup, all I know is that it's running a Ruby on Rails application with a lot of custom libraries installed and that I should prepare myself for a painful migration. Old server: -os: debian 5.0.9 -used disk space: 3.2GB -architecture: i686 New server: -os: debian 5.0.9 -free disk space: 10GB -architecture: x86_64 As you can see the problem is that the servers are running different architectures. Q: Is there anyway I could somehow migrate the old to the new server in a few steps (or am I just dreaming I could) ? I was thinking maybe I could: -get list of packages and gems installed on old server and use for loop to install them all on the new -copy the disk content from old to new server while excluding what is architecture-specific (the problem is that I don't really know what to exclude).

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• How to configure what certificates can be issued using Web Enrollment in Windows Server 2008 R2 Enterprise?

  - by antik

  I have a CA installed on of my Windows Servers in a small farm of systems. I've installed the Certification Authority Web Enrollment and Certificate Enrollment Web Service roles on the CA. I want to issue a Computer certificate to a computer not jointed to my domain. The user attempting web enrollment has domain credentials. The user was able to navigate to https://myServerHostname/certsrv and request a User certificate successfully. However, the user needs a Computer cert as well. From the certsrv site, the user tried the following: Advanced Certificate Request Create and Submit a Request to this CA However, the Computer certificate template is not available under the Certificate Template heading. He is only seeing "User" and "Basic EFS". How do I configure the CA to allow him to request a Computer cert for his system?

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• Content delivery: Alternatives to SHOUTcast

  - by polemon

  I've been using Icecast and SHOUTcast for several years now, to deliver audio and Video content. I wonder what kind of alternatives do I have to those two, especially when streaming video. On the client side, what software can I choose from to stream to those servers live? Making the streams available with Flash would be great, but that's maybe another story. We're still using EdCast, which is kinda dead by now, Shoutcast DSP plugin is not an option, as this tends to crash, etc. Are there any alternatives to that, when livestreaming video? I'm using Liquidsoap for content generation, mixing, etc. It should work with Icecast, Liquidsoap and if possible SHOUTcast.

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• Disable OS X Portable Home Directories for specific hosts for all users, not just individuals?

  - by Paul Nendick

  Would it be possible to block any and all Portable Home Directory services for specific hosts? Something like MCX's "MobileAccountNeverAsk-" but for the whole workstation? We have a network with both portable and stationary machines. I'd like our users to be able to use all machines, going portable on the MacBook but not being bothering with syncing when logged into stationary iMacs or Mac Pros. The Open Directory servers are running Snow Leopard (for now) and all clients are running Lion. Thanks! Paul

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• Setup local EC2 style cloud?

  - by John Kramlich

  I was recently given 3 dual opteron 2400 servers with 4GB of RAM and 120GB hard drives. I am interested in setting up something similar to Amazon's EC2 for my own personal web development use. Basically, I would like to spin up instances from an ISO or other disk images and have them available to test and develop software. Are there open source solutions I can use to accomplish this? I am assuming one of the machines will need to act as a controller of some sort for the other two. I use Sun's VirtualBox on my local development machine to virtualize various versions of Microsoft Windows. However, I'm not sure if that's the best tool for what I am trying to achieve. I apologize in advance if this question is to vague to get meaningful responses. I am new to cloud computing and fairly new at server administration.

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• DD-WRT: What firmware and what webserver will fit on my 8MB of flash?

  - by Jeshii

  Attempting to make a portable WiFi webserver with php support on an old WRT54GS (v1.0) with DD-WRT. I have 8MB of flash on there. I know, it's a tall order. I tried the combination of dd-wrt.v24-13064_VINT_openvpn_jffs_small.bin, optware, and lighttpd. Didn't have enough space. Now I'm going to try dd-wrt.v24-13064_VINT_mini.bin, but I'm only saving 300KB, and I don't think that is going to make the difference. Any other small http servers with php support? Heck, I didn't even got to the point where I could add php! Maybe a way to calculate the size and dependencies of packages from optware BEFORE trying to install is more what I'm looking for. Any ideas?

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• Setting Rails up on a Linode - Nginx Issue

  - by rctneil

  I am extremely new to this so please don't shoot me down: I have set up a Linode running Ubuntu, It is all sort of working except Nginx. I am following this guide: http://rubysource.com/deploying-a-rails-application/ And this for nginx: http://library.linode.com/web-servers/nginx/installation/ubuntu-10.04-lucid When I go to my IP, I get a 500 internal server error. I have tried starting nginx and it looks like it starts fine. I run this: ps awx | grep nginx and I get: 308 ? Ss 0:00 nginx: master process /usr/sbin/nginx 2309 ? S 0:00 nginx: worker process 2311 ? S 0:00 nginx: worker process 2312 ? S 0:00 nginx: worker process 2313 ? S 0:00 nginx: worker process 2850 pts/0 S+ 0:00 grep --color=auto nginx I really am not sure what else to do to get it running. Any help? Neil

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• Connecting to Aerohive AP's from Laptops running Win. 7 using authentication from a Windows 2008 domain server

  - by user264116

  I have deployed a wireless network using Aerohive access points. 2 of them are set up as radius servers. I want my users to be able to use the same user name and password they use when they log onto our domain. They are able to do this from android devices or computers running Windows 8. It will not work on Windows 7 machines. How do I remedy this situation, keeping in mind that the machines are personal machines not company owned and I will have no way to change their hardware or software.

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• Storing bundled AMI:s at Amazon EC2

  - by Industrial

  Hi everybody, I am totally new on configuring servers and working with EC2, so please bare with me. I managed after a lot of hair pulling to get a server with Ubuntu up and running with memcached and some other goodies that would make a great package for me. I thought that however, when storing it as an AMI with this tool I would be able to have memcached available next time I launched an instance based upon that image. What can I do to make sure that my configuration is saved properly to an instance? Question number two: - Can I someway make a command that is automatically run on server creation, like initiating memcache with "memcache -d -m 1700 -u root" or even a batch of them?

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• Open source report framework

  - by Tiax

  I'm looking for a open source report framework for statistics. A more detailed explanation is: We have a number of tests running on different servers collecting data (for example, login time) every 5min. What we need is a framework that collects this data (or exposes web services for us to push the data into the framework) and presents it in form of graphs and so on. Does anyone know of a framework that's easy to use out of the box but has the power to grow? If you know what I mean. Thanks in advance!

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• How do I configure namecheap for "arbitrarily-nested" wildcard subdomains?

  - by rabidsnail

  I'm trying to set up something like nyud.net, where any arbitrary chain of subdomains resolves to the same CNAME record (which in my case points to an amazon elastic load balancer). Ex: www.gogle.com.nyud.net:8080 points to one of their cache servers, which looks at the HOST header and returns www.google.com. I'm using namecheap as my dns host. Adding a CNAME record for *.mydomain.com doesn't seem to do anything (nslookup gives NXDOMAIN for all subdomains). What do I have to do to set this up? Do I have to use something fancier than namecheap (like route53)?

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• Is Zabbix the right tool for me?

  - by hortitude

  I just want to monitor a small handful of servers (less than 10). From reading various places it sounds like the top leading contenders (for open source at least) are: nagios munin zabbix From what I have read a lot of people tend to use munin and nagios together -- munin for history and graphs, and nagios for alerting. On the other hand it sounds like Zabbix is a more complete solution and easier to configure than either of the other two. So I was thinking of going that route. My thoughts right now are: What are the general disadvantages of Zabbix? Does Zabbix have a small footprint on boxes it is monitoring? Do I really need to setup an entire other server for it? I currently have a server that is under very light load -- can I dual purpose it?

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• Running a webserver behind a firewall, is it secure?

  - by i.am.intern

  Currently we have a Linux-based firewall which NAT-ing our public IP address to give internet access to our staff's PCs and a Windows Server 2003 for internal filesharing. I want to host Redmine/SVN (a bugtracker) internally behind this firewall using a Linux server. This webserver will be accessed by our clients externally so they can post bug reports. This means that I have to open port 80 & 22 at the firewall to give access to the webserver and me to SSH it from home. However, let's say I'm using password-based SSH for the webserver and somebody cracked it. Does that mean the cracker could ping and access other servers and PCs in the network?

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• Apache mod_remoteip and access logs

  - by GioMac

  Since Apache 2.4 I've started using mod_remoteip instead of mod_extract_forwarded for rewriting client address from x-forwarded-for provided by frontend servers (varnish, squid, apache etc). So far everything works fine with the modules, i.e. php, cgi, wsgi etc... - client addresses are shown as they should be, but I couldn't write client address in access logs (%a, %h, %{c}a). No luck - I'm always getting 127.0.0.1 (localhost forward ex.). How to log client's ip address when using mod_remoteip?

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• Error from DNS validation service: RFC821 4.3

  - by ferdi

  So I've managed to setup bind9 and a mail server, but it seems there is something wrong. I don't quite under stand this error: The configuration of your mail servers and your DNS are not ok! The report of the test is: mail.domain.com. - mail.domain.com - 208.xxx.xxx.xxx - lisa.domain.com Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server. Can anyone explain this to me in a bit more detail, and maybe point me in a direction to solve this?

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• Updating wordpress in a multi-node environment

  - by Peter

  I'm finding this very tricky in a multi node environment, with code under revision control. AKA. multiple frontends and single database. I have a deployment process that pushes a git repo to the servers, but obviously if I update Wordpress from within the admin panel, it will update the files to one FE. Then I would need to copy over the new files to the other FE nodes. Plus, whenever these changes are written when Wordpress updates on a node, it writes code into the git repo. As such, it then breaks the auto deploys that perform 'git pulls', as it then has untracked changes and refuses to pull in new deploys unless manually intervened. How does one easily keep Wordpress updated in a multi node (load balanced) environment?

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• How do you monitor a monitoring server?

  - by organicveggie

  So we run Groundworks (with Nagios) on CentOS to monitor our various servers and processes. I have it setup to automatically send emails and SMS texts when things reach a WARNING or CRITICAL state. Normally this works perfectly. However, twice we've had problems with Postfix on that server where Postfix decides to stop sending email. The most recent time lasted 4 days because none of us noticed. That leads me to a important question: how am I supposed to monitor my monitoring server?

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• Setting up IIS7 to mimic a GoDaddy shared hosting plan

  - by NerdFury

  I host multiple domains on a GoDaddy shared hosting account. I would like to setup a website locally in IIS 7 that mimics the setup of my hosted account so that I can test and debug applications locally before deploying, as debugging after deploying, or discovering there are issues after deploying is frustrating. I have created a folder WebRoot, at put my main application in that folder. I created a website in IIS 7 and pointed it at that folder. I setup bindings with a fake domain, and created a matching entry in my hosts file to make the fake domain point at my 127.0.0.1. I then created a folder www.otherdomain.com under webroot. I then created an application underneath my website, and pointed it at this folder. I can't find how I can add bindings to the web application to have it referenced as a different fake domain, rather than a subdirectory under my root domain. What would be the proper way to setup IIS to best simulate the environment on the GoDaddy servers.

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