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• Linux DNS Multi tenant

  - by spicyramen

  I need to setup a multi-tenant DNS solution in Linux DNS Server. Currently I serve multiple companies: Company ABC, Company XYZ, etc... I need to create a) Forwarder zone b) Reverse Forward Zone. I can easily create a Forward Zone with domain abc.com The challenge I have is that each of my customer components share the same IP address. Hence If I create the Reverse Forward Zone I end up with something like this: abc.com 1.1.1.1 host.abc.com xyz.com 1.1.1.1 host.xyz.com If I perform a reverse lookup on host.abc.com it works fine...but if I do a reverse lookup on 1.1.1.1 I get a load balance response of: attempt: host.abc.com attempt: host.xyz.com attempt: host.abc.com Any ideas? I want to add logic to the DNS configuration to handle DNS reverse lookup based on source machine and respond with right hostname. Workaround: Create multiple DNS but this is not scalable.

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• Setting a custom timeout to nmblookup

  - by C2H5OH

  As part of a batch script, I have the following command: hostname=$(nmblookup -A $ip_address | awk '$2 == "<20>" {print $1}') Which works fine from a functinality perspective, even for unresolved hosts. The problem is that when the IP address is not reachable or the remote machine does not respond to the SMB request, the command takes about ten seconds to complete. Therefore, the question is simple: is there a way to lower the elapsed time in such cases? Or, in other words, is there a way to set a custom timeout for the nmblookup command? NOTE: I'm interested in solutions that do not make use of SIGALRM or similar mechanisms; if they exist. The nmblookup version is 3.6.3 from Ubuntu 12.04 LTS.

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• How best to troubleshoot a WIA issue through an IIS7 reverse proxy.

  - by CptSkippy

  I've got an Intranet site that uses Windows Authentication and is accessed through an IIS 7 Reverse Proxy. Using FireFox, Safari or Chrome it works fine. I'm prompted for credentials, I supply them and away I go. In IE 7/8 I get prompted for credentials but they're rejected and I eventually get a 401 not authorized error. The application server is configured for Windows Auth only and rejects basic authentication. I would be surprised if the front end proxy would accept Basic Auth so my suspicion is that it's a trust issue with my browser and IE isn't relaying the credentials however our IS Team has IE so locked down I'm unable to alter trust levels or even view the settings. How should I go about troubleshooting this problem? I'm at a loss and they've yet to respond to my support ticket.

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• BIND authoritative name server: SERVFAIL?

  - by Luca Tettamanti

  I have a BIND 9.6 instance that acts as a caching NS for the whole building and is also authoritative for an internal zone ("example" below): zone "example" { type master; file "example"; update-policy { grant dhcp-update subdomain example. A TXT; }; }; Due to a rogue switch we lost connectivity with the rest of the world, and the NS started answering SERVFAIL; what surprised me was that the server was also unable to respond to queries for the example domain. What is the reason of this behavior? Shouldn't the NS be able to answer since it has authoritative data? edit: The rest of the configuration is the standard one shipped with Debian: hints for the root servers and the zones for localhost and broadcast.

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• does ping command to a dns name uses DNS PTR type messages?

  - by TiagoM

  Okay I cant understand this, when I try to ping to a machine on my network using the name associated I get a response from that machine, thats normal.. But there are messages that the sender sends to the top machine (SOA) that I dont understand.. First he sends a type A and gets a response with the IP associated to the name used on the ping command, but after that.. the sender only sends (before each ping) messages of type PTR to the (SOA) Saying this: Standar query 0xf66c PTR 12.45.168.192.in-addr.arpa and SOA respond with: Standard query response 0xf66c No such name And before each ping they do this, I dont know why... I notice this using wireshark, thanks alot again for accept me here, being able to get some answer :)

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• mod_fcgid process doesn't respawn

  - by aaronsw

  I have a Python script running on my server as a FastCGI using Apache2 and mod_fcgid. I let it spawn up to five processes. But I soon get messages like these in the Apache logs: [Wed Sep 02 23:16:34 2009] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function [Wed Sep 02 23:16:35 2009] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function and then Apache doesn't seem to recognize that all its processes are dead (I have a max of 5 backends) and refuses to spawn new ones: [Wed Sep 02 23:26:16 2009] [notice] mod_fcgid: /var/www/hacks.og.theinfo.org/picker.fcgi total process count 5 >= 5, skip the spawn request [Wed Sep 02 23:26:17 2009] [notice] mod_fcgid: /var/www/hacks.og.theinfo.org/picker.fcgi total process count 5 >= 5, skip the spawn request at which point it refuses to respond to requests from the outside world. This doesn't seem to happen with my other FastCGIs, which all use the same Apache config: <IfModule mod_fcgid.c> AddHandler fcgid-script .fcgi IPCConnectTimeout 20 MaxProcessCount 5 DefaultMaxClassProcessCount 2 DefaultMinClassProcessCount 1 </IfModule> Any idea what causes it?

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• How do I obtain a valid DNS resolution given just an IP address?

  - by Dee Newcum

  Is there a publicly-available DNS server somewhere that will respond to requests like: 74_125_225_50.anyip.com And will return 74.125.225.50 for the above request? That is, every single possible IP address can queried by name instead of number. http://ipq.co/ is close to what I'm looking for, but it requires you to first register an IP address before you can query its DNS name. I want a service that does a straightforward mapping from domain name to IP address. Why do I want to do this? I have a program that we use at work that requires a DNS lookup, but I need to be able to give it bare IP addresses. (long story... it's a server that I don't control, so I can't work around it using /etc/hosts)

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• IP addresses for Windows Azure servers seem to be from the US, when the servers are supposed to be located in Europe

  - by paradroid

  I have a couple of test servers on Windows Azure. One is in the North Europe location and the other is in West Europe. I yet to get around to testing which location offers better connection speeds from where I am (London, UK). The Northern Europe Azure datacentre is apparently in Ireland and the West Europe datacentre is in the Netherlands, which is weird in itself I think. But what I am confused about are the IP addresses are both 168.63.xxx.xxx. GeoIP lookup says that they are both located in the US, and traceroute from London to the addresses get to the US before failing to respond pings. What's going on?

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• How to troubleshoot a GPF?

  - by AngryHacker

  I get a GPF dialog box out of the blue fairly often (like about 2 hours after I turn on the computer). It basically says that svchost.exe had a failure... (see the corresponding Event Log entry below). Event Type: Error Event Source: Application Error Event Category: (100) Event ID: 1000 Date: 5/18/2010 Time: 7:41:16 PM User: N/A Computer: DKHA-IPSA Description: Faulting application svchost.exe, version 5.1.2600.5512, faulting module ole32.dll, version 5.1.2600.5512, fault address 0x0004eaa9. Shortly after this error pops up, the computer pretty much grinds to a halt (e.g. some UI elements on the desktop simply do not respond). And I have to do a hard reboot. How do I troubleshoot this type of thing? P.S. The PC has all the latest patches and nothing is missing in the Device Manager.

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• Windows 8 Start Screen very slow after Guest Additions

  - by Renan

  I installed Windows 8 Release Preview on a VirtualBox VM, and it worked correctly. Then I installed the Guest Additions to get the correct resolutions. Now, the Start screen is very slow, takes a long time to scroll and doesn't respond well to clicks. I believe it's not my host, as it's a good machine (i7 CPU, 6 GB of RAM) and this specifically starts to happen after installing the Guest Additions. The task manager doesn't show anything wrong (i.e. no processes pegging the CPU). Any suggestions?

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• 301 redirect Rule For Load Balance F5 BigIp

  - by Kshah

  I have a load balancer F5 Big ip for my website. Currently, I am having 302 redirect in place; however, I wanted to apply 301 but dont know how. For example: My website (abc.com) when typed 302 redirects to abc.com/index and when typed www.abc.com 302 redirects www.abc.com/index. I wanted to have a rule which will help me in abc.com - 301 redirect - www.abc.com/index abc.com/index - 301 redirect - www.abc.com/index www.abc.com - 301 redirect - www.abc.com/index Below is the code that my tech person is trying: Redirect to WWW when HTTP_REQUEST { if { [HTTP::host] equals "abc.com" or [HTTP::host] equals "abc.co.in" or [HTTP::host] equals "www.abc.co.in" } { if {!( [HTTP::path] equals "/")} { HTTP::respond 301 Location "http://www.abc.com[HTTP::path]" } } } Redirect POST when HTTP_REQUEST { if { [HTTP::method] equals "POST" } { persist source_addr pool shop_shop_vr4_http } } Redirect-VR4 HOMEPAGE when HTTP_REQUEST { if { [HTTP::path] equals "/" or [HTTP::path] starts_with "/target/" or [HTTP::path] starts_with "/logs/" or [HTTP::path] starts_with "/config/" } { HTTP::redirect "http://[HTTP::host]/index.jsp.vr" } }

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• Routing based on source address in Windows Server 2008 R2

  - by rocku

  Hi, I'm implementing a direct routing load balanced solution using Windows Server 2008 R2 as back-end server. I've configured a loopback interface with the external IP address. This works, I am receiving packets with the external IP address and respond to them appropriately. However our infrastructure requires that traffic which is being load-balanced should go through a different gateway then any other traffic originating from the server, ie. updates etc. So basicly I need to route packets based on source address (external IP) to another gateway. The built-in Windows 'route' command allows routing based on destination address only. I've tried setting a default gateway on the loopback interface and mangled with weak/strong host send/receive parameters on the interfaces, however this didn't work. Is there any way around this, possibly using third party tools?

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• Returning "200 OK" in Apache on HTTP OPTIONS requests

  - by i.

  I'm attempting to implement cross-domain HTTP access control without touching any code. I've got my Apache(2) server returning the correct Access Control headers with this block: Header set Access-Control-Allow-Origin "*" Header set Access-Control-Allow-Methods "POST, GET, OPTIONS" I now need to prevent Apache from executing my code when the browser sends a HTTP OPTIONS request (it's stored in the REQUEST_METHOD environment variable), returning 200 OK. How can I configure Apache to respond "200 OK" when the request method is OPTIONS? I've tried this mod_rewrite block, but the Access Control headers are lost. RewriteEngine On RewriteCond %{REQUEST_METHOD} OPTIONS RewriteRule ^(.*)$ $1 [R=200,L]

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• Is it possible to load balance requests from a single source?

  - by Shawn

  In our application, Server A establishes a TCP connection with Server B, then it sends a large amount of requests to Server B over the TCP connection. The request message is XML-based. Server B needs to respond within a very short period, and it takes time to process the requests. So we hope a load balancer can be introduced and we can expedite the processing by using multiple Server B's. This is not a web application. I did some research but failed to find a similar application of load balancer. Can anyone tell me if there's a load balancer can help in our application?

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• can't resolve host (A) but FQDN is fine

  - by user1431356

  I am getting inconsistent name resolution locally with DNS I have 3 2012 Standard servers and some weirdness on 1. It is a standard install with IIS role added. TEST01 is a dev server. 192.119.1.220 with a host header of TEST01. DATA01 runs internal DNS on .240 and all servers and clients point here for DNS. There is a forward in DNS to 192.119.1.1 (router) with ISP external DNS #s mapped. if I ping TEST01 from a non AD machine, it I get "Could not find Host TEST01" If I ping TEST01 from a domain machine(another server), it resolves the IP but does not respond. if I ping TEST01.AD.local, DNS resolves the IP, but times out. I can access IIS by entering http://test.WWWDOMAIN.com and I can RDP to it, just not ping. Any idea where I should start?

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• WHM new account nameservers not responding

  - by Jae Kun Choi

  I've setup a new account in WHM and updated the nameservers from Domain Registrar and it's not responding from the server. So I went to DNS functions and Nameserver IP's and I have the following ns1.example.com.au No IP 4 ns2.example.com.au No IP 4 I'm not sure whether "NO IP" part is the problem I went in to the domains and they seem to be properly set up. Below is what my Domain Registrar responded with my ticket. those nameservers are either a) offline/not responding or b) not set up correctly as nameservers. Is there a place I can check in WHM to make nameservers respond correctly? The nameservers I updated with above ns1.example.com.au and ns2.example.com.au but it's not working. WHM version is: WHM 11.32.2 (build 18)

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• Accessing DHCP Client's vendor-encapsulated-options

  - by Jason Owen

  In the dhcpd.conf file for isc-dhcpd-V3.1.1, I have set up a vendor options space and defined several different options. I am able to use those definitions to send options from the server to the client in the vendor-encapsulated-options option (code 43). However, the client is also sending vendor options back to the server, in the same way, and I'd like to respond differently depending on the type and contents of the options. As far as I can tell, the the server isn't parsing the client's vendor-encapsulated-options at all - the option operator is just returning null. Is there a way to get the server to populate the options in the vendor space I've defined?

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• Duplicate IP address detection with multiple NICs

  - by sfink

  I am using arping -D to detect duplicate IP addresses within a network when setting up servers. (The network is controlled by someone else, and we have had many issues with IP allocation in the past.) It works fine as long as my host has a single NIC on a given VLAN, but when my host has more than one (I have one with 9 NICs on one VLAN and 1 on the other), arping -D always returns false collisions. The problem is that all 9 of my NICs respond to an ARP request for any of the IPs on those NICs. (These are real physical NICs, not aliases or anything.) I send out one ARP request packet, and get 9 ARP is-at ARP replies, one for each MAC address. I could implement my own solution by sniffing packets and checking for any replies with a MAC address other than the local NICs', but it seems like there ought to be an easier way.

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• IP tables gateway

  - by WojonsTech

  I am trying to make an iptables gateway. I ordered 3 dedicated server from my hosting company all with dual nics. One server has been given all the ip addresses and is connected directly to the internet and has its other nic connected to a switch where the other servers are all connected also. I want to setup iptables so for example the ip address 50.0.2.4 comes into my gateway server it fowards all the traffic to a private ip address using the second nic. This way the second nic can do what ever it needs and can respond back also. I also want it setup that if any of the other servers needs to download anything over the inernet it is able to do so and by using the same ip address that is used for its incomming traffic. Lastly I would like to be able to setup dns and other needed networking stuff that i maybe not thinking about.

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• Computer crashes and won't start, LED indicator blinks slowly

  - by hexacyanide

  I have a MSI K8NGM2-FID motherboard coupled with a AMD Athlon 3700+ and an Antec TPII-550 power supply. The computer crashes at random times in operation, sometimes taking a while to crash, and sometimes crashing right after Windows XP shows the desktop after boot. The CPU temperature is always in the safe range, usually 30-33 degrees Celsius, and swapping the RAM has not done anything, so the crashes aren't cause by the RAM. What could be causing this? If the motherboard were fried, would the computer even boot at all? What causes inconsistent crashing of the computer? After the computer crashes, the LED power indicator blinks about once a second, and the computer does not respond to the power button. This behavior continues until the computer's power supply is completely removed.

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• Why BSNL 3G not opening some websites ? [closed]

  - by Sarang

  I am Sarang Dave from India. I am using BSNL 3G prepaid wireless broad band. When I have purchased it, it could open the website : http://stackoverflow.com But, now from last 2 months, I am unable to open this website. :( I have changed my DNS server to 8.8.8.8 & Alternate server to 8.8.4.4. This both are the free google dns servers. But, still facing the same problem. For reference : http://code.google.com/speed/public-dns/docs/using.html I am getting following error after loading : The server at stackoverflow.com is taking too long to respond. Please suggest the solution. For reference : Few websites not opening with BSNL 3g Husshhh!! Finally DNS issue solved In Pune By BSNL 3G team. BSNL 3G: Ya Sites will open now :P Thank you.

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• ICMP - TTL - Trace Route

  - by dbasnett

  I asked this question at Stack Overflow and then thought this may be the better place to ask. Given the following situation: PC --- |aa RTR1 bb| --- |aa RTR2 bb| --- |aa RTR3 bb| etc Each of the |aa rtr bb| is meant to be a router with two ports aa and bb. My question is this. When you do a trace route from PC which router port address should respond with time to live exceeded in transit message? I seem to remember being taught to think of the router as being in as many parts as ports, so that in my scenario when aa is forwarding the packet to bb and decrements the ttl to 0, it will be the address of the aa port in the failure message. I am trying to find the definitive answer. Thanks.

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• Router stopping my python server

  - by drfrev

  This was originally posted in stackoverflow.com but it was suggested I move it here after it was realized it wasn't my code that was wrong. So my problem, very simply, is that I cannot get my computers that are connected to my router to communicate. example: If I ping a wireless computer I get no responce and the Request times out If I ping a computer wired to the modem directly it works fine. When I ping I use the local ip for each case. *if it helps my original post is here: http://stackoverflow.com/questions/12593024/python-cannot-go-over-internet-network/12593361#12593361 And some screen shots of different things are here: http://imgur.com/a/jUZ4G#3 thank you, any help is greatly appreciated. NOTE I am heading off to bed now, so I will respond around 6:00 AM EST if anyone posts some help

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• My acer aspire laptop suddenly stopped working, just a blank screen

  - by mazda

  My acer aspire laptop suddenly stopped working while it was connected to my nokia mobile modem through usb. It stopped with power swich staying on and no response to clicking off, no irregular sound, nothing but just a blank screen. I disconnected the power and battery quickly but power switch did not respond at all and even the power indicator didn't turn on again. the display was also gone after disconecting the power and removing battery. It has no response or any sign of power while both battery and power supply are working. What do you think? A completely dead mainboard? Does the MB has any safty board or fuse that could be replaced? Any suggestion will be appreciated, Thank you.

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• Browsers not responding

  - by Jesper

  Hello, Strange thing started to happen to my computer yesterday, and I can not recall installing anything new or updating anything the last few days either. It was first the browser, Chromium, that started to freeze up and not respond for ages, say 10 minutes. Then my email, Windows Live Mail client started doing the same thing, I click on an email and the program goes "not responding" for 5-10 minutes. At first I thought it was Chromium, so i reinstalled it but no help, So i installed Opera and thought I would give it t a try, but not same thing is happening to Opera so it is clearly an OS issue or/and internet connection issue. Does anyone know what the problem can be? Im running Windows 7 32bit on a dual core Sony vaio laptop with 4gb ram. There is nothing wrong with the actual internet connection as it works fine on other computers on the network, and the connection it self does not drop. Grateful for any help, Jesper

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