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• How to reach a Global Scope IPv6 host?

  - by Vaibhav Bajpai

  I have setup DNS64+NAT64 on a machine with 2 interfaces: eth0: public IPv4 address (connected to outside world) eth1: global scope IPv6 address: 2001::/64 I can successfully use ping6 google.com on this machine. Now I want to connect my MacBook to this machine by making it an IPv6-only client and perform some tests, but I do not have an IPv6 address assigned on this MacBook. I'm wondering, how should I manually assign one so as to route all my IPv6 traffic (I will disable IPv4 on my MacBook) to this machine, which will be picked up by DNS64+NAT64 to be converted to IPv4 requests and sent to the outside world?

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• SSD Performance for PHP?

  - by Andrew Fashion

  My programmer just built an application with PHP using Doctrine ORM (will be a high traffic social networking website), and it's very heavy in PHP/Apache and CPU. The queries are wonderfully fast, and MySQL is barely using any CPU, it's just Apache. I was curious to if an SSD would help speed up PHP/Apache, because I know the bottleneck is in PHP reading multiple files, class files, and loading up a bunch of data. So common sense makes me think if PHP is reading multiple PHP files, an SSD would only help as far as read/write? I was thinking of doing a high performance SSD for the PHP application, but for user image uploads, I would just continue using a 15k SAS. Is there any performance issues regarding using an SSD in this kind of situation? And would it prove to help speed up PHP/Apache, and help the CPU problem out?

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• Downloads speed starts ok but after a few seconds they go down to 10kbps?

  - by peterg

  Since yesterday any file I try to download from any host start downloading ok (at 1mbps) but after a few seconds the speed start to decrease down to 10kbps. I use a mobile modem (huawei) and I connect to a wcdma network. What could be happening? I use kaspersky, and I checked the Network Monitor and I don't see any weird process using bandwidth. What other tests can I run? Recommend me some app to monitor the traffic to see if I have some malware or see where my bandwidth goes.

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• Backing up data (including mysqldumps) to S3

  - by seengee

  We have a web app on a number of servers and we want to add an additional layer of redundancy by backing up the key data to S3. The key data is the MySQL database and a folder containing dynamically created site assets - predominantly images. Some kind of rsync based solution would initially seem the best plan. A couple of years ago we played with S3cmd (in particular s3cmd sync) with some success but we didn't find it particularly reliable although this may have changed since. Its occurred to me though that a rsync solution might not work particularly well with a single db.sql file created with mysqldump and I assume this means the whole database getting transferred each time, with multiple databases of over 1GB this is going to add up to a lot of traffic (and $s) very quickly. With the image files I could simply just transfer files modified within the last day which would be far more simple. What approach should I look at?

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• Reverse proxy with SSL and IP passthrough?

  - by Paul

  Turns out that the IP of a much-needed new website is blocked from inside our organization's network for reasons that will take weeks to fix. In the meantime, could we set up a reverse proxy on an Internet-based server which will forward SSL traffic and perhaps client IPs to the external site? Load will be light. No need to terminate SSL on the proxy. We may be able to poison DNS so original URL can work. How do I learn if I need URL rewriting? Squid/apache/nginx/something else? Setup would be fastest on Win 2000, but other OSes are OK if that would help. Simple and quick are good since it's a temporary solution. Thanks for your thoughts!

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• Can Squid 2.7 proxy gzipped content

  - by Tom Styles

  We have a forward proxy for our network which is Squid 2.7. This is managed for us by a third party. We noticed recently that http requests going from our network to the web were having the Accept-Encoding header removed. This was resulting in all web traffic across our network (approx 8000+ PCs) being uncompressed even though the browsers and server on each end were capable. We have asked the third party to look into this and they have said it is because Squid 2.7 does not support compression. I understand this to be true but I was under the impression that the compression happened on the webserver rather than the proxy. So... Can Squid 2.7 proxy and/or cache content that is gzipped? If it can, how/why might it be configured such that the Accept-Encoding header is being removed?

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• Connect iPad to windows 7 VPN

  - by Linuz

  My iPad keeps spitting out the error: "A connection could not be established to the PPP server." I am trying to connect it to a VPN I set up with Windows 7 as an incoming connection. On the iPad, I went into the VPN settings, added a new PPTP VPN with the following information Server: Windows 7 Computer's IP RSA SecurID: OFF Account: Account Username Password: Account Password Encryption Level: Auto Send All Traffic: ON Proxy: Off Now I know that it is making some connection to the Windows 7 Computer because whenever I intentionally put in the wrong VPN password on the iPad, it makes me put in the correct one before trying to connect again. All the ports are forwarded on my router for PPTP, and my Windows 7 Firewall is even off to try to get this to work. Any help would be greatly appreciated, thanks.

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• HTTPS redirects in nginx

  - by CadentOrange

  I'm trying to redirect all HTTP traffic to HTTPS. The web server I'm using is nginx. This is the server block I'm using to do the redirect. server { listen 80; rewrite ^ https://$server_name$request_uri? permanent; } This successfully redirects URLs like http://localhost to https://localhost. However, for URLs like http://localhost/table/ I get redirected to https://table which is incorrect. I would like it to re-direct to https://localhost/table/ Any help would be much appreciated. Update: It seems that the rewrite scheme has a problem with trailing slashes. For example, http://localhost/table gets correctly redirected but http://localhost/table/ does not.

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• Real-time Image Resize, Cropping and Caching Server Product

  - by Elijah

  I'm investigating what products are out there that will allow you to request images through a HTTP API in arbitrary image sizes. The server would behind a CDN but would still need to be able to handle a fair bit of traffic and be possibly load-balanced. I've been tasked with writing such a service, but I wanted to do some due diligence to see what commercial or open source solutions are out there. Google has not been particularly helpful. It may be because I have been searching for the wrong term. Third-party sites and services are out of the question because of corporate policies.

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• Can only connect to sql server express 2012 via named pipes

  - by YetAnotherDeveloper

  I have sql server express 2012 installed on windows 2008, locally everything works just fine i can connect via tcpip and named pipes. Remotely i can connect with ssms only using named pipes. I have tried disabling the firewall on both sides to eliminate blocking traffic. i have toggled the tcpip setting on and off (i read somewhere that they got it working just but flipping them off and back on). I have double/triple checked all the settings that i'm aware of and everything seems to be correct. Tcp is enabled Tcp port is set to 1433, udp port is set to 1434 Server has static ip Start up log says: Server is listening on [ 'any' 1433]. Firewall rules are in place Any suggestions on things that i can look into? i have really just run out of ideas.

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• How to achieve redundancy across data centers?

  - by BrandonBT

  I have a LAMP server with a lot of hardware redundancy built in. I am not worried about the server becoming unavailable. What I am worried about, however, are potential network issues in the data center the server is in. What I would like to have is another server in another data center for redundancy. Load balancing is less of a concern. With that said, I am relatively clueless on two points: How to have two servers in two geographically separate data centers that have exactly the same data, in terms of both files and MySQL databases. How to ensure that all traffic coming into one data center are automatically transferred to the other database in the case of a network or server failure at the first data center. Any guidance on how to accomplish the above two problems would be greatly appreciated.

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• How would I measure the amount of RAM needed per Glassfish domain? [closed]

  - by oligofren

  Possible Duplicate: Can you help me with my capacity planning? In our test environment we have a lot of apps spread out over a few servers and Glassfish domains. To make versioning easier I would have liked to have one Glassfish domain per customer per app (kind of like a heavyweight version of lots of jetty instances). But I have heard that Glassfish is kind of heavy on the resources, and so I would need to measure approximately how many instances would fit in the available RAM. These are low-traffic/low load testing servers, so CPU is not really an issue, though RAM might be. How would I get an approximate measure of how much RAM is needed? This is one Glassfish 3 instance with one heavy EAR application deployed. top? jvmstats? ??

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• Under what circumstances might an IIS6 website be automatically deleted?

  - by E. Anderson

  Late last week my colleagues did some hardware maintenance on one of our vmWare esxi servers. One of the guests is a Windows Server 2003 Web Edition system that runs our low-traffic web sites. We discovered this morning that one of those websites was no longer working with what appeared to be an SSL error. After logging in, I found that the web site in question had been deleted from IIS! Is it possible for this to happen without a user actually going in and deleting that single web site? All of the other sites were fine. The files for the site in question had not been touched. I just re-created the web site, assigned the SSL cert, and everything was working again. When I logged in, I did see the 'Unexpected Shutdown' dialog.

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• Firewall still blocking port 53 despite listing otherwise?

  - by Tom

  I have 3 nodes with virtually the same iptables rules loaded from a bash script, but one particular node is blocking traffic on port 53 despite listing it's accepting it: $ iptables --list -v Chain INPUT (policy DROP 8886 packets, 657K bytes) pkts bytes target prot opt in out source destination 0 0 ACCEPT all -- lo any anywhere anywhere 2 122 ACCEPT icmp -- any any anywhere anywhere icmp echo-request 20738 5600K ACCEPT all -- any any anywhere anywhere state RELATED,ESTABLISHED 0 0 ACCEPT tcp -- eth1 any anywhere node1.com multiport dports http,smtp 0 0 ACCEPT udp -- eth1 any anywhere ns.node1.com udp dpt:domain 0 0 ACCEPT tcp -- eth1 any anywhere ns.node1.com tcp dpt:domain 0 0 ACCEPT all -- eth0 any node2.backend anywhere 21 1260 ACCEPT all -- eth0 any node3.backend anywhere 0 0 ACCEPT all -- eth0 any node4.backend anywhere Chain FORWARD (policy DROP 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 15804 packets, 26M bytes) pkts bytes target prot opt in out source destination nmap -sV -p 53 ns.node1.com // From remote server Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2011-02-24 11:44 EST Interesting ports on ns.node1.com (1.2.3.4): PORT STATE SERVICE VERSION 53/tcp filtered domain Nmap finished: 1 IP address (1 host up) scanned in 0.336 seconds Any ideas? Thanks

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• How can I use a Windows 2003 server as a HTTP proxy?

  - by Will

  I'd like to set up an HTTP proxy on a windows 2003 server so that I can access blocked websites such as YouTube from behind a corporate firewall (DAMN THE MAN!). I've never done this before, so I'm not even sure if the picture I have in my head is valid or possible. So I'm stuck behind a firewall that blocks sites that I need to access occasionally but that are blocked because of abuse by slackers. I've got a Windows 2003 server hosted out on the internet (i.e., outside of this odious firewall). I know I can configure my browser to use a proxy for my HTTP traffic, so why not use my server? What I'd like to know is: Is my concept valid? Can this be done, and will it work? How do I configure my server to act as a proxy? What applications may I have to install? Free is fine but don't leave out commercial software TIA

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• VPN Configuration

  - by Josh

  How can I allow incoming connections on a Windows 7 machine that is connected to VPN? I have some services listening on certain ports that I have forwarded from my router. When the VPN is disconnected, I can connect to these services from my internal network as well as from the Internet without issue. When I connect my VPN however, I am still able to access the ports from my internal network, but not remotely. I think I need a split tunnel setup, and there is an option in the VPN settings to Use Default Gateway on remote network. I want this option enabled so all my traffic is routed through the VPN, but I want incoming connections to be allowed on my internal network IP from the Internet. Is there some hybrid way to set this up with routing?

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• Need advise on linking apache and tomcat

  - by hsnm

  I have been searching this for hours with no luck. I have a web server that uses https on Apache2. I also have installed tomcat7 on the same server to run some Java webapp on it. I need to keep my https port 443 on Apache but forward the requests to the Java webapp to tomcat. I tried to use mod_jk to redirect the requests to tomcat but I failed. Most tutorials talk about redirecting plain http requests not https. I also could not let tomcat use https on 8443. I'm following the steps here but facing errors. The question: Can I redirect https traffic to tomcat without installing https on tomcat? Is there a good tutorial you can recommend to me?

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• Eliminate single point of failure for webservers?

  - by George Bailey

  I know in DNS, that each of the DNS servers will be tried to see if they will respond I know in email that in the event of a failure it will go to the next one in the list or it will hold the mail for a period of time As far as I know,, in webservers,, the browser will get one of the webserver IP addresses and try it and if it fails it will give up. Is this correct? If so,, then the only way to direct traffic away from a failed IP address would be with the DNS servers.. and even that would not update immediately?

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• Iptables: masquarading and routing

  - by nixnotwin

  I have a WAN router which is linked to isp over a /30 WAN subnet. But it also servers as a router to a /29 local public WAN subnet which is connected to few of my servers. The traffic from /29 gets routed to ISP via /30 subnet. For a wired reason I want to masqarade (NAT) the interface which has /30 ip. So the interface with /30 ip should appear as masquaraded for my 192.168.1.0/24 network and it also should act as a normal non-NAT router for my WAN public subnet /29. Can this be done with iptables on a Linux machine?

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• Routing connections to passthrough a local machine

  - by xiamx

  Please tell me if what I'm trying to do is feasible. I have a router named "R" which is connected to WAN. R allows adding rules to the routing table. There are numerous of machines connected to the LAN port of R, they all have ip addresses 192.168.1.* assigned with DHCP on R. Among those machines, there's a machine C with ip address 192.168.1.100. I want all traffic of other machines in the subnet to pass-through machine C where some filtering and logging will be done. Is this possible? Is there a name for what I'm trying to do? (so i can do more googling later)

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• How to configure a static wildcard subdomain with dnsmasq.

  - by Prody

  I have a network behind a NAT with a few machines. The machines are: router - NAT, dnsmasq, forwarding - directly connected to the inet server - which runs ssh, www and some other stuff clients - which do stuff on server I also have mydomain.com. server.mydomain.com is pointing to my connection's IP (single IP), which is the router, which forwards ports to server. Server, has a httpd running, which serves different sites based on vhosts. So I have site1.server.mydomain.com, site2.. The problem is that all the traffic is going thru the router, and when I check logs I always see the router's IP for everything (so it's hard to see who is running the script with the while(1)). I would just ServerAlias site1.server.local, but most of the sites have a root URL saved somewhere on top of which other URLs are built, so I can't do that. The solution for me would be telling dnsmasq somehow to answer to *.mydomain.com with server's IP. Is this possible somehow?

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• Proxy - Some general questions

  - by user68802

  Is it possible to accomplish the following scenario with a proxy server? We are having one internet facing server that we want to put behind a proxy for some reasons. We want everything to work as before. When they do a request all connections will be forward to the internal server which will send back the information through the proxy. We want to be able to change to proxy to show an maintenance page whenever we are doing maintenance and change it back to forwarding traffic when we are done. We do also want to be able to keep forwarding all users that are using the sites but show an maintenance page for all new users for a time before showing the maintenance page for everyone in order to give the users some time to finish their work before kicking them out.

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• Windows 2008 R2 Not resolving IP's or domains

  - by InsaneAR

  I have two servers with Microsoft Windows Server 2008 R2 x64, and today I realized that one of them don't resolve IP's or domain names. If I ping the same machine IP, it respond, but if I ping an external IP (like 8.8.8.8 or any other) it does not work. The same with domain names. At Windows Event Viewer I'm having Warning 1014: Name resolution for the name timed out after none of the configured DNS servers responded THE SERVER HAS CONNECTIVITY, I'm connected remotely and the services and incoming traffic (like FTP, etc) are working OK. Things I've done & tested: Run Kaspersky Virus Removal 10 Restart/Turn off the DNS Client service Clean the hosts file Reboot the server Turn off the Windows Firewall (there's not another firewall) Quit or replace the current DNS servers I just can ping the same machine IP or the gateway! Can anybody help me?

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• Is it possible to cause artificial network packet loss or latency?

  - by nbolton

  I'm trying to reproduce some issues on a deployed application where the MSSQL server and client are running in two separate machines. I think there may be network issues between the two machines, so I'd like to try and reproduce these conditions on two Hyper-V virtual machines (on the same virtual server). Of course, the network for these virtual machines is "local" so it's actually far from the conditions in a live environment. Is there a program I can run on either virtual machine which will degrade the network performance? Or maybe any other work arounds? For example, one way to reproduce the conditions may be to run the VMs on separate Hyper-V servers in geographically dispersed locations (so the SQL traffic goes over VPN or something) -- but this is a little long winded I think. There must be a simpler way.

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• How can I tell if my ISP is redirecting my DNS queries?

  - by Nack

  I've attempted to use some DNS services like OpenDNS, and no matter what I do the DNS queries don't return the expected results. Watching the packet traffic on my firewall, I can see the queries go out to the intended DNS server address and responses coming back, but the results are not as expected, for example, the OpenDNS test page always fails even though the requests appear to be going to their servers. I suspect my ISP is intercepting DNS queries and sending them to their own servers. Is there a way to verify this? Is there something else I might be missing? I'm using 3G wireless service from Sprint.

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