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  • Strange DNS problem [seems to be IPv6 issue]

    - by Homer J. Simpson
    Hi, I'm experiencing strange problems with my Kubuntu 9.10 when doing DNS requests from various applications. The requests are extremely slow, so loading any pages in Firefox or Konqueror, doing package installations in Kpackagemanager and other apps is really painful, while for example Opera doesnt have any problems, and ping is normally fast as well for DNS pings. I checked the proxy settings of both the used applications as well as of the general system and there are none, so to me it doesn't seem as there was something inbetween.. Does anybody have an idea on what to check for possible problem sources or how to solve this ? I'm behind a DSL home router which does the DHCP (and works well with my other computer). Any kind of advice would be really helpful. Edit: It seems to be some kind of IPv6 problem, as I could get it to work by disabling IPv6 explicitly in Firefox. Is there a general solution to this ?

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  • Setting up a router as a DNS server only

    - by Jacob R
    I have a Linksys WRT54GL router that I don't need anymore, since I had to buy a 3G capable router (Dovado 3GN). As I only have a 3G connection at home, I want to optimize it as much as possible. I want to setup a caching DNS server, including some blacklisting of ad domains. The router currently runs the DD-WRT firmware. Is it possible to use this router as an ordinary computer, running only a DNS server, disabling all other features such as DHCP, WLAN, etc? Connecting it to my other router, should I simply run a cable into the WAN-port of the Linksys router?

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  • Godaddy vs. Route53 for DNS

    - by tim peterson
    I have my website set up as an EC2 instance and my DNS is currently Godaddy. I'm considering switching to Amazon AWS Route53 for DNS. The one thing I noticed however is that Route53 charges monthly fees but I never get any bills from Godaddy. Obviously, nobody likes getting charged for something they can get for free. If Godaddy is cheaper, can anyone confirm that the page load speed of an EC2 instance is actually better via Route53 vs. Godaddy? If it is not faster or cheaper, can someone point out other reasons it might make sense to do this switch? thanks, tim

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  • With dnsmasq as the DNS server, 'dig' succeeds, but 'nslookup' and 'ping' fail

    - by einpoklum
    I installed dnsmasq on a machine of mine (It's a Kubuntu 12.04 LTS), backed only by /etc/hosts (no connection to the Internet until later). Now, when I'm on the same machine as the dnsmasq - or any other machine on the server, I can dig mymachine and get 192.168.0.1, but if I try to nslookup mymachine, I get: >> connection timed out; no servers could be reached Tried also nslookup mymachine.mynicedomain.org - didn't work either. pinging fails. How can I the DNS lookups to work? Is the problem with the nsswitch entries? The dnsmasq configuration? Additional Information In the server's /etc/hosts: 192.168.0.1 mymachine In the server's nsswitch.conf: hosts: files mdns4_mininal [NOTFOUND=return] dns mdns4 (admittedly, this is a bit weird) In resolv.conf (which is generated by dnsmasq): nameserver 127.0.0.1 search mynicedomain.org In the server's /etc/hosts.allow: domain: ALL In the other machines' /etc/resolv.conf (this is set by the DHCP client): nameserver 192.168.0.1 search mynicedomain.org Finally, here's the ipconfig output from one of the client machines on the network (running Windows 7): Connection-specific DNS Suffix . : mynicedomain.org Description . . . . . . . . . . . : Intel(R) 82579LM Gigabit Network Connection Physical Address. . . . . . . . . : 12-34-56-78-9A-BC DHCP Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 192.168.0.50(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Lease Obtained. . . . . . . . . . : Sunday, October 20th 2013 16:20:25 Lease Expires . . . . . . . . . . : Sunday, October 20th 2013 18:20:24 Default Gateway . . . . . . . . . : 192.168.0.1 DHCP Server . . . . . . . . . . . : 192.168.0.1 DNS Servers . . . . . . . . . . . : 192.168.0.1 NetBIOS over Tcpip. . . . . . . . : Enabled Notes: May be related to this question.

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  • DNS and IPs - Does DNS send the IP back to the client?

    - by Josh
    I ran across a site that talked about routing all cients requesting by IP to a "dead end." The clients accessing the site via ip it claimed were typically automated exploit tools and bots. Legitimate users type in the web address by it's domain question. With this context in mind, I don't really understand how DNS really works. I thought it worked by sending an IP back to a client for the requested DNS (like a phone book.) The client then uses the IP to access the site. The information above seems to indicate I misunderstand this. Can someone clarify this? (http://technet.microsoft.com/en-us/magazine/2005.01.hackerbasher.aspx)

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  • Setting up a router as a DNS server only

    - by Jacob R
    I have a Linksys WRT54GL router that I don't need anymore, since I had to buy a 3G capable router (Dovado 3GN). As I only have a 3G connection at home, I want to optimize it as much as possible. I want to setup a caching DNS server, including some blacklisting of ad domains. The router currently runs the DD-WRT firmware. Is it possible to use this router as an ordinary computer, running only a DNS server, disabling all other features such as DHCP, WLAN, etc? Connecting it to my other router, should I simply run a cable into the WAN-port of the Linksys router?

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  • Setting up DNS in WHM/cPanel

    - by Jon Furmanski
    I don't understand what I'm doing wrong, but I'm sure this is a simple fix. I setup WHM/cPanel for the first time on my VPS and understand how DNS works for the most part (or so I thought). I created under the main domain name 2 nameservers (ns1.maindomain.com & ns2.maindomain.com). I have 2 IP address for my sever so each one points to a unique IP: ns1.maindomain.com => 198.x.x.204 ns2.maindomain.com => 198.x.x.205 I also set up reverse DNS with my hosting provider. When I put in my two nameservers under another domain (secondary domain), GoDaddy states that the nameservers are invalid. Any ideas on why this is or any configurations in cPanel that need to be made?

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  • The concept of virtual host and DNS [migrated]

    - by Subhransu
    I have a dedicated server and a mydomain.com (bought from a hosting company). I want to host a website from my dedicated server with the domain mydomain.com i.e. when I enter mydomain.com from browser it should point to the IP(let's say X.X.X.X) of dedicated server(and a particular folder inside it). I have some following queries: In Server I know I need to edit some of the files (like: host or hostname file) in the server but I do not know what exact file I need to edit. How to add a Site enable or Site available in apache2 ? In Hosting Company control Panel Which records to add (A or cname or anyother)? Where Should I add DNS(in dedicated server section or domain name section)? How it is going to affect the behaviour of the domain? in short the question is: How the virtual host works & how to add DNS?

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  • Understanding DHCP setting for DNS Server Options and Scope Options

    - by Saariko
    I have installed 2 DC's on my network (W2K8 R2) both serve as a replicate DC on my domain. On one of them (DC1) there is also a DHCP server running. On both I have a DNS server running. I am trying to understand the difference in the settings within the DHCP of Server Options and Scope Options. As I understand it: On the server options, I should put an external DNS for system (lets say 8.8.8.8 - google) And on the scope options, I should put both my internal dc1 and dc2 IP's as the server. - which are than distributed to my domain clients. Is that correct? Is there a better way? Do I need to add loopback address as well?

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  • SSH Proxy (SOCKS) through remote computer - TCP & DNS

    - by Moz Morris
    My problem: Need DNS to be resolved through my remote machine. So I have a REMOTE that I can access from LOCAL via SERVER. This REMOTE can access a host TARGET_HOST. TARGET_HOST is setup in REMOTE's host file like so: 123.123.123.123 TARGET_HOST I want to be able to access (in the browser & my application) TARGET_HOST from LOCAL. I have setup a 'proxy' like so: LOCAL to SERVER: ssh -L 4567:LOCAL:4568 user@SERVER SERVER to REMOTE: ssh -D 4568 user@REMOTE LOCAL's network config is setup to use a proxy on localhost through port 4567. So, everything is great and I can see TARGET_HOST in my browser. The problem I have is that the DNS doesn't resolve from LOCAL and therefore some code I have going on in my application, fails. Can anyone help me? Can anyone suggest a better method?

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  • Resolving real IP address out of a dynamic dns address

    - by stavnir
    I recently opened a dynamic dns user (at no-ip for that matter..) for my own personal needs and especially for ssh-ing my computer whenever I need to, without knowing it's static IP. My questions are: Am I misusing the concept of dynamic dns? Are there more appropriate methods to do what I want to do? If not, how do I resolve my router's real ip address? Firefox somehow manages to do so, nslookup and other similar commands only resolve the ip of the ddns server (e.g. no-ip.org). Trying to figure this mystery with wireshark failed miserably ;)

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  • sasl and tls with dns load balancing

    - by achal tomar
    I am using DNS load balancing in my centOs 5 server.The mail sent to the load balancer server are balanced by sending them to 4 more servers who then pass the mails to their destinations in the network.The mails are generated by a Php script which gives all the mail to the load balancer server. Now i want sasl and tls authentication in the load balancer server so that i can prevent the mail server from spammers,Can anyone tell me how to do this. The load balancer pass the mails to other servers based on equal mx record preference,so i want sasl authentication with Dns load balancing.

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  • Questions about Domains and DNS

    - by ShoX
    Hi, I am totally new to the DNS and server hosting world and not quite sure what I need. I want to get a domain, forward it to my own server, so that the user sees example.com in the url bar and example.com/foo/bar will work. Depending on what subdomain it is, it should do different things (another base-directory at webserver, ftp, etc). Also my email should be able to be sent to and received by that server. What irritates me, is the fact, that in the A-record I can only list IP-addresses and no ports. So do I have to set up a nameserver on my own server? Or do I accomplish this via vhosts on my webserver? I would appreciate any help or link to a tutorial. I know how DNS works, know some basic apache-stuff, etc... so no need to explain that. Thanks

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  • Exchange 2013 - DNS Records for Accepting Multiple Domains

    - by William
    I have an Exchange 2013 server accepting two domains: domain1.com and domain2.com. All of the exchange services (OWA, ECP, POP3, SMTP, etc.) can be found via the address mail.domain1.com. So, in the DNS records for domain1, I have the following entries: MX Record mail.domain1.com A Record mail.domain1.com - (IP Address of Server) CNAME Record autodiscover.domain1.com - mail.domain1.com Now, for domain2.com, how would I set up the DNS records? Would I have the autodiscover just be a cname for autodiscover.domain1.com? Would this allow me to leverage the certificates that I have installed for domain1?

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  • Setting DNS suffix for multiple network adapters in a VM

    - by arun_bh
    Is there a way to set the DNS Suffix for multiple network adapters in a VM using the sysprep file? We are trying to setup Windows 2003 VMs with 2 network adapters. In the one adapter case the sysprep we are able to set the suffix using DNSDomain. But this doesnt work in the 2 adapter case. The The VM is setup corrently though without any issues but one of our apps relies on the DNS Suffix value to work correctly. Thanks in advance.

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  • Public DNS Server fails on Windows Amazon EC2

    - by Adroidist
    I have started a new Windows server instance on Amazon EC2. The security group has the following rules: Ports Protocol Source 22 tcp 0.0.0.0/0 80 tcp 0.0.0.0/0 443 tcp 0.0.0.0/0 3389 tcp 0.0.0.0/0 53 udp 0.0.0.0/0 -1 icmp 0.0.0.0/0 I am able to ping the public DNS server of the machine and i can connect to it using Windows Remote Desktop connection. However, when i put in my web browser the public DNS server, it fails to connect. Morever, I used filezilla and putty (and in both I loaded the private key .pem) but i receive connection timed out. I disabled the firewall on both my pc and the instance (which I entered using Remote desktop connection). Can you please tell me what I am missing?

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  • How is DNS used by individual processes?

    - by atroon
    When resolving FQDNs or machine names to IP addresses on my local network (mycompany.internal) I can use dig on the command line (linux/mac) or nslookup (windows) to query the configured server and get a response. But trying to enter the FQDN or even just the machine name in a ping command or in a web browser results in 'Unknown Host' or DNS errors. Here's a sample, this one from the Mac: mac:~ atroon$ dig server.mycompany.internal ; <<>> DiG 9.6.0-APPLE-P2 <<>> server.mycompany.internal ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5219 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;server.mycompany.internal. IN A ;; ANSWER SECTION: server.mycompany.internal. 1200 IN A 172.16.254.36 ;; Query time: 0 msec ;; SERVER: 172.16.254.8#53(172.16.254.8) ;; WHEN: Wed Dec 16 11:39:15 2009 ;; MSG SIZE rcvd: 55 mac:~ atroon$ ping server.mycompany.internal<br> ping: cannot resolve server.mycompany.internal: Unknown host I cannot for the life of me figure this one out. The DNS server is a SBS 2003 box which handles AD, some file/print, etc for a small company network. This issue happens to me about three times a week, and when I'm connected to the local network directly, the same switch as the server even. I can make any connection I want with IP addresses, I just can't make DNS work. Additionally, at the same time I'm experiencing this, other users are fine, which makes me think it's a problem on my Mac. But what sort of problem? How can dig send a query and get a reply, and ping say 'unknown host'? I'm posting here vs. serverfault because I think this is a local problem not a server problem...but if anyone can point me at the server, I guess we'll head down the street a domain or two.

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  • Set up Windows SBS dns server and vpn clients from brench office

    - by mn
    I have got some clients from bench office which connects vpn to main office. The Router from bench office assigned addresses from DHCP 192.168.1.0/255.255.255.0 and remote gateway assigned vpn ip addresses 10.10.20.0/255.255.255.0. There is a DNS server (Active Directory Win SBS 2000) and vpn client are registered with vpn address (10.10.20.0/255.255.255.0 and domain company.com.pl). I would like to register also primary bench subnet 192.168.1.0/255.255.255.0 with domain for example company.vpn.local I want to access vpn hosts for example: dev3.copmany.pkb.local and dev3.company.com using my Win SBS 2000 DNS server.

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  • Setting DNS Siffix for multiple network adapters in a VM

    - by arun_bh
    Is there a way to set the DNS Suffix for multiple network adapters in a VM using the sysprep file? We are trying to setup Windows 2003 VMs with 2 network adapters. In the one adapter case the sysprep we are able to set the suffix using DNSDomain. But this doesnt work in the 2 adapter case. The The VM is setup corrently though without any issues but one of our apps relies on the DNS Suffix value to work correctly. Thanks in advance.

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  • DNS: domain2 points to domain1

    - by Yar
    I have one domain ("domain1") that is set up with hosting and mail (hosted by Gmail Apps). This domain works perfectly. I want a second domain ("domain2") to forward to domain1, but I don't want to use "DNS Forwarding." I would like to have it act EXACTLY like domain1, so that domain2/whatever points to the same resource as domain1/whatever WITHOUT AN HTTP REDIRECT NOR BROWSER TRICKS LIKE FRAMES. I would also love to be able to send mail to "blah@domain2" and have it go to "blah@domain1". Can this be set up, and how? I am using GoDaddy as registrar and DNS host for both domains. GoDaddy is also the web host for domain1, and mail hosting is with Google Apps.

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  • Excessive Outbound DNS Traffic

    - by user1318414
    I have a VPS system which I have had for 3 years on one host without issue. Recently, the host started sending an extreme amount of outbound DNS traffic to 31.193.132.138. Due to the way that Linode responded to this, I have recently left Linode and moved to 6sync. The server was completely rebuilt on 6sync with the exception of postfix mail configurations. Currently, the daemons run are as follows: sshd nginx postfix dovecot php5-fpm (localhost only) spampd (localhost only) clamsmtpd (localhost only) Given that the server was 100% rebuilt, I can't find any serious exploits against the above stated daemons, passwords have changed, ssh keys don't even exist on the rebuild yet, etc... it seems extremely unlikely that this is a compromise which is being used to DoS the address. The provided IP is noted online as a known SPAM source. My initial assumption was that it was attempting to use my postfix server as a relay, and the bogus addresses it was providing were domains with that IP registered as their nameservers. I would imagine given my postfix configuration that DNS queries for things such as SPF information would come in with equal or greater amount than the number of attempted spam e-mails sent. Both Linode and 6Sync have said that the outbound traffic is extremely disproportionate. The following is all the information I received from Linode regarding the outbound traffic: 21:28:28.647263 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647264 IP 97.107.134.33 > 31.193.132.138: udp 21:28:28.647264 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647265 IP 97.107.134.33 > 31.193.132.138: udp 21:28:28.647265 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647266 IP 97.107.134.33 > 31.193.132.138: udp 6sync cannot confirm whether or not the recent spike in outbound traffic was to the same IP or over DNS, but I have presumed as such. For now my server is blocking the entire 31.0.0.0/8 subnet to help deter this while I figure it out. Anyone have any idea what is going on?

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  • DNS security (hijacking?)

    - by Jongsma
    I am hosting my website on Linode and am also using their DNS/naming servers. (ns1.linode.com etc.) It occurred to me that I never have had to authenticate that the domain is mine when I added it to the domain to the DNS manager, or at any other point. I now wonder whether it would be possible for other Linode users to 'hijack' my domain by simply adding the same domain zone and pointing it to their own server. I wouldn't know how Linode could determine which are the real/authentic records. How can I be sure this doesn't happen?

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  • DNS configuration for external/internal resolution

    - by FerranB
    HI, We have an internal web server which is available through Internet and from local network. The server is located in the local network. The current configuration is the following: To access through Internet you use http://webexample.com To access through Local Network you use http://myweb The main problem is that the local users cannot share links with external users. Thats a problem for us. I want to setup the following configuration: All users (local and Internet) access through http://webexample.com The local DNS server resolves http://webexample.com to the local Network IP (i.e 192.168.2.100) Any other suggestion? Which is the best way to override http://webexample.com resolution in Windows Server? It can be done on DNS server or it have to be done in hosts file?

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