DNS set up
I have problem setting up a correct DNS. This is a possible cause Open Dir doesn't work, in-fact I'm unable to create an Open Directory Master; while all the other services (web, mail, ical) work fine.
The server name on ServAdmin top left side is macweb.local; the machine IP is 192.168.115.24.
From term the command changeip -checkhostname, prompts the following:
"Primary address = 192.168.115.24
Current HostName = macweb.server.com
The DNS hostname is not available, please repair DNS and re-run this tool.
dirserv:success = "success""
So far I created under the DNS function of ServAdmin a primary zone with:
zone name=server.com
nameserver-hostname (fqdn)=macweb.server.com.
Then a record machine named=macweb
with two IP addresses under it: 127.0.0.1 and 192.168.115.24
obtaining two reverse zones mapping macweb.server.com on the two ip.
Re-running the changip command the result doesn't change.
Any suggestion is very well appreciated.
Alberto.
Message was edited by: albfran
Message was edited by: albfran
[Here is a DNS server set-up sequence|http://labs.hoffmanlabs.com/node/1436]. That's end-to-end.
Are you strictly referencing this DNS server from your LAN and from your DHCP server, or are there references to any other DNS servers mixed here?
Assuming your server here is your DNS server, is your DNS server here referencing itself (in the guise of the 127.0.0.1 loopback address) via System Preferences > Network controller > static IP, static DNS server setting? Or is it referencing some other DNS server?
Your other clients on your LAN can refer to your DNS server via its static IP address, but the DNS server here should use the loopback address.
Post the output of the Terminal.app commands +dig server.example.com+ and +dig -x server.ip.address.here+ in its entirety, and I'll have a look at the data returned. (If you want to obfuscate your domain there, that's fine, but don't obfuscate the 192.168.0.0/24 addresses anywhere in what's returned, and the obfuscation of the host names needs to be consistent for the output to be useful in diagnosing this.)
And FWIW, you probably aren't the organization that has registered the server.com domain name, so please stop using that domain either for real in your configuration, or using it as your example domain name. If your intent is to obfuscate your domain name (and which is fine by me) then use example.com, example.net or example.org as your domain name. These are RFC-reserved example domains. This usage both avoids referencing a domain you don't have registered, and it makes your intent here clear. It means I don't have to ask you "is that your real domain, or are you obfuscating?".
Similar Messages
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I am trying to setup Microsoft office mail and need assistance - I am receiving the error, unable to find server and DNS setting in the Network
Which version of OSX and what email provider are you using.
-
Could someone who has dns set up correctly confirm that this test works?
The test that's here http://docs.info.apple.com/article.html?artnum=106798 says if you attempt to visit this link:
http://17.254.0.91
and you are taken to Apple's page then you probably don't have your DNS set up correctly.
Can anyone confirm, who has their DNS set up correctly, that attempting to visit that link does not work for them please?
TIARight, thanks for that info. I don't understand what all the code stuff is at all, but I do understand this:
If you type in the link stated and you are taken to Apple’s page then DNS IS SET UP CORRECTLY.
I'm still confused though. In that article/test in part of its explanation of DNS it says:
If you encounter some applications that continue to work, it may be because they are set up to go directly to an IP address, bypassing the need for DNS service.
Surely typing in http://17.254.0.91 into your browser is a way of making your browser access apple's site *bypassing DNS*? -- because you're using the IP address irradicating the need for changing a name into an IP address. The way to test if DNS is working, surely, is to try and access apple's site via www.apple.com? Not http://17.254.0.91.
Thanks. -
DNS Set Up system throw as ORA-12154; TNS :could not resolve the connect id
Hi,
While i'm creating DNS set up system throws below message
unable to connect
SQLState=08004
DNS Set Up for instantclient(win32-10.2.0.4) system throw as ORA-12154; TNS :could not resolve the connect identified specified.
operationg system:xp
dir path:C:\Oracle\instantclient10_2
TNSNAMES.ORA(C:\Oracle\instantclient10_2\NetWork\ADMIN) Contants
YourTNSName =sankar
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST =localhost)(PORT =1521))
(CONNECT_DATA =
(SID =sankar)
(SERVER = DEDICATED)
dir contains:
sqresus.dll,
sqresja.dll
sqoras32.dll
sqora32.dll
oraociei10.dll
oraocci10.dll
orannzsbb10.dll
ojdbc14.jar
ocijdbc10.dll
ociw32.dll
oci.dll
classes12.jaruser7197586 wrote:
Hi
I have been created one DBLink it's created but when i am trying to access the data through the link it's raise error as
"ORA-12154: TNS:could not resolve the connect identifier specified"
CREATE
PUBLIC DATABASE LINK
Vrd_tcplink
CONNECT TO
"SAPVRD"
IDENTIFIED BY
"manager123"
USING
'VRD_TCP.WORLD'
created this above dblink
Kindly Suggest to wau out.
Regards,
Sachin
When using a dblink, the database with the link is acting as a client to the remote database ... exactly like sqlplus running on the db server.
read: http://edstevensdba.wordpress.com/2011/02/26/ora-12154tns-03505/ ora-12154tns-03505 -
Need to Reconfigure DNS Setting on My AirPort
Comcast is making changes that require a reconfiguration of the DNS setting on my AirPort (Extreme). Without the reconfiguration, I am unable to connect to the internet. How do I change the DNS setting to "Dynamic DNS" so that any settings can be made automatically by Comcast? I'm clueless.
Any help is appreciated. Thanks.If you're referring to Microsoft Remote Desktop Connection then you need to post your question on a Microsoft forum as this forum is for troubleshooting Apple Remote Desktop...apples software for managing Mac on your network.
Please clarify which software you're referring to. -
I cannot access my email due to a change on my website. I have been told I need to purge the DNS setting on my mac so that the new settings will then be stored.
What happened is I had to redirect people accesing my website because my isp doesn't have SQL server. Once the redirection happened I couldn't access my email, from anywhere. On my PC's I "flushed" the DNS settings so the updated setting would be stored. I need to do this on my mac.
How do I do this?
Thanks!DNS Fundamentals
The following section will go over DNS fundamentals. A Domain Name Server's primary duty is to take IP addresses and return host names, and vice versa. For example, a computer's IP address of 15.1.1.10 will be converted to 'starfury.zone.com' by the DNS. There are several different types of records that are used with a DNS. The most important is the A-record, which returns an IP address for a host name. The A-record's inverse is the PTR record, which returns a host name for an IP address. The PTR record is a little strange because it is created by reversing the IP address and adding 'in-addr.arpa.' to the end. There is also a CNAME record which is a host name alias to another host, this allows multiple host names to resolve to one IP address. These three record types are illustrated below.
A-record name -> IP address host.domain.com -> 12.1.8.51
PTR IP address -> name 51.8.1.12.in-addr.arpa. -> host.domain.com
CNAME host name alias name.domain.com (A-record name) = othername.domain.com
The next type of DNS record is only used by SMTP Mail Servers. It is called an MX record, or mail exchanger. An MX-list is used with a host to specify how mail for that host should be delivered. The MX-list contains all the possible mail exchanger hosts along with preference values indicating which host should be the final recipient of mail. A host with a lower number value has higher preference (a host with a value of 10 would be preferred over a host valued at 15). If two hosts have the same preference value, they do load-balancing between them. MX records are best explained by example.
MX-list record for mail.company.com
10 mail.company.com
20 mail-backup.company.com
30 isp-backup.isp.net
In this example a mail server attempting to deliver mail to 'mail.company.com' will ask DNS for the MX-list shown here. The server will then try and deliver the mail to the host on the MX-list that has the lowest numerical preference value. In this case it would be 'mail.company.com'. The server will then look up the IP address for 'mail.company.com' and deliver the mail to that address. If that host is not available the mail server will attempt to connect to the next best host, 'mail-backup.company.com'. If 'mail-backup.company.com' is also not available the mail server will then try 'isp-backup.isp.net'. Supposing 'isp-backup.isp.net' was up it would accept the mail and then assume responsibility for forwarding it on to 'mail.company.com' because that host is the preferred final destination for mail addressed to 'mail.company.com'. If all three of these hosts are down the attempting mail server will wait for a while (usually around 5-20 minutes) and try all three again in preference order.
There is a lot more complexity to DNS than what has been described, but that is enough background information to get started. This next section will describe the ways in which the Apple Mail Server uses DNS to deliver mail.
How the Apple Mail Server uses DNS
The Apple Mail Server uses DNS to discover what host names should be considered "local" and to properly deliver mail to other mail servers. Without a DNS available the mail server will be essentially nonfunctional. Many mail delivery problems are the result of a misconfigured DNS server. The Apple Mail Server is designed to use the information returned by DNS to auto-configure itself so that it "knows" what names it can be called by.
Who am I?
One of the first things the mail server does when it starts up is determine what its own names are. It will use DNS to look up the PTR record for the server computer's IP address to discover the name or names that goes with it (Example server IP 15.0.0.21 = 'mail.zone.com'). This name will be marked as a "local" host in the host list. The server will also mark any hosts that end up being local when resolved through DNS. If a mail comes in that is addressed to 'alias.zone.com' and this name maps to 'mail.zone.com' using a CNAME record, then it will be marked local as well. MX-list hosts can also become "local" hosts if they point to the same computer, (zone.com MX-list; 5 mail.zone.com 10 nowhere.zone.com) 'zone.com' will be "local". All mail addressed to "local" hosts will be delivered to users in the mail servers Users & Groups list. Any hosts which are not local will need to be contacted for message delivery.
Server IP address 15.0.0.21
PTR for 21.0.0.15.in-addr.arpa. -> mail.zone.com
A-record for mail.zone.com -> 15.0.0.21
CNAME for mail.zone.com -> alias.zone.com
MX-list for zone.com
5 mail.zone.com
10 nowhere.zone.com
Local Host Names: mail.zone.com, alias.zone.com, zone.com
Using MX-lists
MX-lists are usually used in two ways. (1) Providing an alternative/backup mail server for a host, and (2) mapping a domain wide address to a specific mail server. It is important to have a backup mail server available to handle mail for your domain when your primary mail server goes down. You should configure an MX-list for your host which indicates mail for your mail server 'mail.wigit.com' should be delivered to 'mail.wigit.com' unless it is down, in which case it should be delivered to your backup server, 'mail-backup.wigit.com', or your Internet Service Provider's mail server, 'mail-backup.isp.net'.
MX-list for mail.wigit.com
10 mail.wigit.com
15 mail-backup.wigit.com
20 mail-backup.isp.net
The second use for the MX-list is to provide a "shortcut" email address for your mail users. An MX-list can be created for a host that doesn't have an A-record, this is called an MX-only record. It is used to simplify email addresses, instead of having an email address of '[email protected]' you can simply use '[email protected]'. To do this, create an MX-only record which indicates mail for 'wigit.com' should go to 'mail.wigit.com'. You'll also want to include your mail server backups in this MX-list.
MX-only list for wigit.com
10 mail.wigit.com
15 mail-backup.wigit.com
20 isp-backup.isp.net
The mail server will also use the MX-list for all outgoing mail. It will look up the MX-list for each host and determine which computer should be contacted to deliver the mail. If the mail server comes across a host that does not have an MX-list it will attempt to connect to the A-record address for that host. The server will also try the A-record address if all hosts on the MX-list are unreachable. -
Changing my dns setting saved my iPad! But what is "dns"?
http://dekoded.com/2010/05/09/ipad-slow-youtube-fix/
I have to share this because it worked for me.
I was having trouble viewing YouTube videos because of very slow loading times. I was advised to change my dns setting and like magic-- YouTube flows smoothly now!
But what is "dns"? Will changed setting affect anything else?
I was ready to take my iPad back because this was a deal breaker for me but now...I may just keep it!DNS is the Domain Name Service, and it's used to translate Internet network addresses into names.
Computers on the Internet, from servers down to your iPad, have to have an identifying address so that they can receive message properly. Internet addresses look like this:
123.123.123.001
Which is fine if you're a router, but hopeless if you're a person. DNS associates a name (e.g www.megacorp.com) with the address. When you enter the name the server resolves it to the address.
There are lots of DNS servers doing this: ISPs have them, big companies have them, and there are public ones (e.g Google and OpenDNS). They sometimes get out of sync, so changing DNS can fix some odd problems -
After all the issues I was having with the server, I decided to do a clean install. This time I have it set as a standalone server until I get the DNS set properly.
Right now, the way I have my DNS configured is this:
^ 0.16.172.in-addr.arpa. - Reverse Zone
- 172.16.0.100 - Reverse Mapping - server1.markhadjar.com.
^ markhadjar.com. - Primary Zone
- server1 - Machine - 172.16.0.100
- mail - Machine - 172.16.0.100
- www - Machine - 172.16.0.100
highlighting markhadjar.com. shows that my name servers are set as:
Zone: markhadjar.com.
Nameserver Hostname: server1.markhadjar.com.
Is all this correct?
Running checkip -checkhostname results in:
Primary Address: 172.16.0.100
Current Hostname: server1.markhadjar.com
DNS HostName: server1.markhadjar.com
The names match. There is nothing to change.
Traceroute works when using server1.markhadjar.com and 172.16.0.100
however, when I type in just the domain markhadjar.com it can't find anything. I have reason to believe this is why some of my services before were not working properly.
Before doing the clean install, I was only able to get Mail and VPN to work. AB/iCal would not work. iChat would only work if I used [email protected] and having the server set to server1.markhadjar.com but it would not work with [email protected]
Any help would be appreciated!
THanksIf you are trying to access your server from your local client machine you need to have the client looking to your server added to the DNS lookup path. Trying to access the server from outside is a whole different story.
-
DNS set up when not distributing dns
Ok it's not clear but let me try, I am in a place where they give me an ip address and my domain names come from godaddy and are directed from there. sorry I'm french. Here's my question,
Do I need to setup DNS on leopard server if I want to use all the services, open dir, qtss , podcast producer ect. or since I don't distribute dns, can I not use the dns service.
I'm not sure I expressed my self properly so ask questions if you need to know more.Do I need to setup DNS on leopard server if I want to use all the services, open dir, qtss , podcast producer ect. or since I don't distribute dns, can I not use the dns service.
If you want to run your own directory service for your clients then you SHOULD run your own DNS server. This is essential if you're setting up your server in a private-class network (e.g. 10.1.x.x or 192.168.x.x) since GoDaddy are not going to be able to resolve your internal hostname(s).
The fact that no external users will ever query your server for DNS lookups doesn't matter - your own machine will and that's what counts. -
DNS Setting for internal sites
Hello -
I've had terrible problems with my internet connection recently. No internet connection = no DNS (using Google) and therefore I can't even access sites which are hosted within my own network.
Could anyone talk me through adding DNS references to internal sites on SLS ?
My set up :
ADSL modem (bridge mode) into Airport Express which runs DHCP / NAT
SLS connected to Airport which has DNS server already running.
changeip -checkhostname returns
Primary address = 10.0.1.2
Current HostName = xx.xxx.ltd.uk
DNS HostName = xx.xxx.ltd.uk (changed these entries)
The names match. There is nothing to change.
dirserv:success = "success"
My domain name is registered with an external supplier - and set to point to my static IP address.
Thanks for any help !
AndrewOne thing that did help me though - and this may be obvious to you, but I had problems with Server admin crashing. Changing the DNS server in network preferences on the server itself and the client I was working on to a public DNS helped. Guess that should be pretty obvious though.
If things get wonky, I usually try to run Server Admin directly on the target server box.
Am I safe to reference the DNS server on the client now as dns.mydomain.com ? ie - if that is where the client is getting it's DNS references from, how does it know where dns.mydomain.com points to before it looks it up ?!
DNS servers are referenced by IP address, not by host name. Until the DNS server is available, the DNS names won't work; a bootstrapping problem.
As for testing the server, you can use the dig command to test.
+dig @ip.addr.dns.server whatever+
Also - I am using an Airport Base Station for DHCP / NAT - but can't see how I can specify a DNS server so that all clients receive it automatically ? (This is fine for clients that don't leave the office, but a pain for laptops)
AirPort Utility > select target AirPort > Manual setup > Internet > DNS Servers -
Do you think I have my DNS set up correctly?
Hi
I have bought a macmini server running the latest OSX software. I plan to host my own website and email from it. My ISP has given me a static ip address and I plan to set up my advanced DNS settings as follows, though I have used fake url & ip address for this question:
A Records: Host Name - myserver.example.com / IP Address - 215.40.70.84
DNS "MX" Records: Points to - 215.40.70.84 / Priority - 1
My question is, would the above enable my url to point to my new server and deliver emails to it?
Thanks!
Mark- Could you expand on VPN end-point capabilities? I googled this but the explanations are a bit too technical for me. BTW I am running a 2wire BT2700 router.
VPNs can be forwarded via NAT (which gets ugly) to a server, or the gateway itself can include a VPN server.
If you connect directly to a server (port-forwarding everything at the gateway), you have to get all of the network traffic through NAT, and NAT can get ugly for a couple of reasons, and the server must be booted and working or you won't have an end-point for the VPN connection. (VPNs tend to seek security through various means including the use the originating IP address, and NAT seeks to mess with the originating IP address.)
With a VPN connection into a VPN server in the gateway, your local client is effectively similar to a client directly connected on the target network.
I'd be surprised if that 2Wire widget had a VPN server, but check the documentation. It does look to be possible to [switch (some?) 2Wire 2700 gateways into bridged mode|http://www.dslreports.com/forum/r21066151-2wire-2700HGB-bridge-mode-simple -tutorial] and place a server-grade firewall behind it. (A bridge is comparatively transparent to an IP connection.)
I often suggest a VPN, and for various reasons. Remote access into the LAN for maintenance and general access to LAN-local resources and particularly for various operations from untrusted networks, and as a path for remote support. AFP or SMB and other protocols are best kept behind the gateway, for instance. And the VPN scales as your network scales (you're able to get directly to any box, and not hopping around via an internal VPN server host), and a VPN-capable gateway keeps the riffraff at the edge of your network.
- I agree on split horizons. Do you know of any websites with user friendly explanations of this?
Questions or comments on [Mac OS X Server DNS configuration|http://labs.hoffmanlabs.com/node/1436] are welcome. -
Clearing Host Name from Dynamic DNS set up - Home ...
I changed my DNS provider due to poor performance. Since then I have been trying to change the host name and it stays with the original. Do I have to rest teh home hub back to default settings and set it up again?
If so this is very poor...!Oh and that is "reset the hub"
-
Heya Guys,
I think I have worked out why I can get things to work now. I have been able to set up many standard servers with no problems at all using ISP DNS but I keep failing when I try to set up advanced server running its own DNS.
Previously I have been setting up the DNS with local IP to server.pushmymail.com.au
ie...
10.0.1.2 - server.pushmymail.com.au
When the whole time I should of been using the public IP
124.170.168.106 - server.pushmymail.com.au
As my router is set to pass anything from that public IP through to the server with the local IP.
Am I right in thinking this? I will try it out tonight when I get home.
Cheers.HI,
I kind withdraw my question. I was reading apples server resources and finally found some info that pretty much explianed it to me. -
Hello !
I've got a real trouble with my dns configuration... and i can't understand! so, i need some help....
well, qutie newbie in mac os server, i run in on a G4, and i had not noticed any trouble until i've decided to run open directory as a master with LDAP, wanting to have a kerberos protection for the users.
Kerberos doesn't want to play with me !
I've been in console mode to have a look, and, actually i've seen this :
"Oct 17 11:31:08 wakan servermgrd: servermgr_dns: no name available via DNS for 192.168.0.109
Oct 17 11:31:08 wakan servermgrd: servermgr_dns: no reverse DNS entry for server, various services may not function properly"
Ok... my DNS has a trouble... but i don't know how to fix it ! Is there anybody in this world who can help me?
I don't want to have a real DNS for my little server... but i understand that my config is not good. I can understand that having a caching DNS can improve the quality of my config, and, in other hand that it is necessary for having the services of OSX server in an effeciant way, but i don't know the way and the parameters i've to put in my config to fix it.
Now, just some words on my config...
First, i've got an adress provided by my FAI (the frenchy workd for ISP, i think) is "193.252.209.135". This adress is set on a d-link modem router via PPOE. The DNS of my provider (wanadoo.fr) are 80.10.246.1 and 80.10.246.132.
After this there is my G4 With mac osX server.
• en0, the "extenal gate" and the internal ethernet on the computer is plug on the modem with the adress "192.168.0.109". the router is set on "192.168.0.1". the dns are 80.10.246.1 and 80.10.246.132.
• en1, the "internal gate" for the network, an PCI card in the computer, has the parameters : adress "192.168.3.1", subnet "255.255.255.0", router "192.168.3.1". no dns records. (no VPN service for the moment). After this, i've a switch for the macs behind the server. (without any link agregation)
All those parameters have been set by the gateaway assistant.
And now the parameters inside the admin server :
DHCP : en1 - adress from 192.168.3.2 to 192.168.3.254, name 192.168.3. no static card. Router 192.168.3.1. No name for domaine by defaut, name servers 80.10.246.1 and 80.10.246.132 No LDAP, no WINS.
DNS : No zone transfert, recursivity is ON. No zone records.
NAT : set on full, Transfert and Network Address Translation.
When i've been on the terminal, i had those information:
"wakan:~ st$ sudo changeip -checkhostname
Password:
Primary address = 192.168.0.109
Current HostName = wakan.local
The DNS hostname is not available, please repair DNS and re-run this tool."
All my "main" services are working fine (AFP, Firewall, DHCP, DNS, Update) Open Directory is running without Kerberos. By the way, all the macs after the G4server can have a corect access to internet, and share information via LDAP of Open Directory, but i've to say that, a couple of days later, a friend of mine, who has a PC computer, can't have a DHCP dynamic address when he plug on my little network. I think that it is an other trouble, and i've decided to have e look to this later... but if someone knows how to resolve it...
So here begins the nightmare for me... so if anybody can help me... i realy need some help to fix this mystery!!!
Special thanks!As the router modem is already doing NAT why use NAT in the server?
If you want to use OpenDirectory and other services you should/need to set up the DNS correctly using the server's private IP (and others in the same range the server is setup with). The domainname used internally can be different than your public one.
And then use the server as the only DNS for you LAN clients and the server itself. Forwarders (your ISP DNSes) in /etc/named.conf usually speeds up lookups of external addresses (also turning off IPv6 can help that too). -
DNS set-up for multiple servers?
I need some DNS advice....
I am replacing our old OS Leopard server (that provided web hosting, email, file serving, dns, etc.) with four new Mac Mini Servers (Maverick) to distribute the services. We had an issue on the old machine's fileserver service that brought all services to a halt and then the employees to a halt.
Since one machine was the central hub of everything it was easy to set-up the DNS to point to it for everything. Now that I have four machines (one of them serving the DNS) I need to know how to point to the other services. The DNS user interface only allows me to input DNS infer for that particular server. How do I add names and address in the DNS to point to the other three servers?
Thanks in advance.
BrianTo add to MrHoffman's advice, as long as the two machines have different IP addresses, they will only know about each other if you tell them.
For example, server.gilliland.com is running Leopard and is at address 172.16.0.10. You want a new device to also be know as server.gilliland.com but don't want to shut the other one down. Ok, give it another address, 172.16.0.11 for example and define on it DNS that points server.gilliland.com to 172.16.0.11. As far as the new server knows, it is server.gilliland.com and is start of authority for the gilliland.com domain. The old server thinks the same thing. But as long as you don't tell either about the other, they will live happily in the belief that they are the one and only server.gilliland.com server.
Now, as longs are you are already relying on DNS (meaning nothing is linked via IP), then you can completely build you entire new OD cluster while the old systems is still running. DHCP will tell everyone to use DNS from the old server. You new servers will be configured with new DNS and they will all be in on the new secret. When you are ready to make the migration to the new cluster, change DHCP and push new DNS out to the clients. As long as they connect by name (server.gilliland.com) they will not miss a beat.
Depending on your services, this can be done with almost no downtime. Got lots of data? rsync it. The biggest headache you will have is likely the mail migration. That is a torture I wish on no one. Make sure you have a backup plan, a regression plan, a head for the border plan, and then an alternate plan for when all of those plans fall apart. I also suggest closing your port forwards on the firewall when you decide to move mail. This will allow you to validate the migration without new mail coming in. Thus, if something goes wrong, but not completely "the sky is falling" wrong, then you can restore the old server, open the firewall, and live to try again another day.
Reid
Apple Consultants Network
Apple Professional Services
Author "Mavericks Server – Foundation Services" :: Exclusively available in Apple's iBooks Store
Author "Mavericks Server – Control and Collaboration" :: Exclusively available in Apple's iBooks Store
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