How to set up dynamic dns?

Hi everybody,
could anybody help me to set up Dynamic DNS in the Airport Extreme? I am using Airport Utility 5.5.3
I also have dlink dns service active
Thank You
Manolo Fernández

The following is the basic setup for DDNS on the AirPort using AirPort Utility v5x:
AirPort Utility > Select the base station > Manual Setup >AirPort > Base Station tab > Edit ...
Use dynamic global hostname (checked)
Hostname: <enter your DDNS service domain here>
User: <enter your DDNS user account name>
Password: <enter your DDNS user account password>
Click "Done."
AirPort Utility > Select the base station > Manual Setup > Disks > File Sharing tab > Share disks over the Internet with Bonjour (checked)

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How we set up multiple websites on OSX Server

BACKGROUND
After fiddling and futzing around for weeks (actually since last year) I've finally figured out how to set up multiple websites (virtual sites) using one port and one IP address. While there seems to be lots of discussion on this topic, it seems that the basic assumption is that one knows everything about websites, DNS and all that stuff, which I do not.
When our network was originally established the engineer set up a wiki and also configured webmail, so we had two sites, one secured for mail and the other open for Calendar and the wiki. We were not hosting any websites locally because our school website is hosted by a company in New England.
This year I wanted to set up websites for teachers and students. As great as the wiki is, there are some things it just can't do as well as a website. So I figured if I set up the sites teachers could link back and forth from one to the other. In addition kids could now start to use a real website instead of the cobbled together file mess I had when we ran a Windows network. Also iWeb is a much more accessible tool than FrontPage.
SERVER SIDE:
Snow Leopard Server - 10.6.4
There are two - actually three pieces if you want your iWeb clients to connect to the server: Server Side Web Services, DNS and, in my case, FTP.
================================================ SERVER SIDE - WEB SERVICES
If you haven't turned on Web services, you'll need to open Server Admin and do that. If you don't know how to set up web services - just reply and I'll step you through that as well.
Once web services are set up and turned on, you'll see it listed under your server’s name in the Server Admin sidebar. Click on "Web" and then click on the "Sites" tab at the top of page. This is where you list all your sites.
Click the plus button and enter the fully qualified name of your site, for example: "students.myschool.org". Don't use the defaults here (no name) - that's what got me in trouble before. BE SPECIFIC!
You'll be looking at the "General" tab (the other tabs, "Options", "Realms", etc. we'll deal with in a second).
On the "General Tab", the default IP address ("any") and port (80) is just fine. We'll run everything over port 80. (Apache figures all the virtual site stuff out - you don't need your rocket science degree for that.)
"Web Folder:" is important because this is how you'll "segment" your websites. While I would NEVER do this again, we have a solid state hard drive for the OS and a RAID array for our data files. IF you have that, make sure you do NOT use the default "Web Folder" because it will store all your files on your solid state drive. There may not be enough room, over time, on that drive. I've not experienced it yet, but it's my understanding that if the drive fills up, the server shuts down.
I store my web sites on a folder on the RAID array.
Everything else on that tab can be left as the default. (Just make sure that you have an "index.html" or "index.php" file in your web folder root, but iWeb will take care of that for you.)
I would put in your email address in the "Administrator Email:" field.
Under "Options" you really don't have to put anything. I've tested making websites with iWeb and it doesn't appear that anything needs to be checked.
Nothing needs to be entered in "Realms" as well from what I see working w/ iWeb.
The defaults in "Logging" are fine.
You can leave "Security" alone, but we do have a (self-issued) certificate listed for our webmail site.
"Aliases" is important. Under "Web Server Aliases" you enter how you want the site to respond to when users type in a URL in their web browsers.
When our web server was initially set up the engineer set up "wiki.myschool.org" on port 80 and "mail.myschool.org" on port 443. In the aliases section was nothing but a "*" (the wildcard character). That means, from what I can figure out, that the webserver will respond to these sites regardless of what is typed in the URL. (Well, something like that - point is, if you create OTHER websites, you'll NEVER get to them because the wildcard character in the "Aliases" section, in effect, grabs those web requests and redirects them to the sites that are already there.
In my case I deleted both of those wild card characters. For my "wiki.myschool.org" site, I entered "mail.myschool.org". That means if you type EITHER "wiki." or "mail.", go to the site that’s stored in the “Web Folder” we set up when those sites were created.
For "mail.myschool.org" I just DELETED the wildcard character. I wanted that site (since it was secured) only to respond to "mail." - nothing else. (You're not going to that secured site for any other reason than to get your mail.)
"Proxy" can be left blank. Have no idea what that does. As time permits I'll do some research and figure out what it's used for.
"Web Services" is if you want to provide any MORE services to this particular site. Most likely you'll want to uncheck all the boxes. For our "wiki." site, we have checked "Wikis", "Blogs", and "Calendar". For our "mail." site we have those checked PLUS "Mail".
I would create a separate "Web Folder" for each of your sites. I don't know if that's a requirement but for housekeeping purposes, I would keep the sites separated. And I SUSPECT that it's "best practice" to separate your wiki from your other websites.
SERVER SIDE - DNS
OK...now you have to make your site reachable and the only way to do that is to set up DNS so that folks don't need to type in the IP address of your web server. You need to set up DNS inside your network and, if you want folks in the outside world to reach your website, you'll need to set up an external DNS as well. I'm going to cover INTERNAL DNS - if you don't know how to set up EXTERNAL DNS - reply or email me and I'll post those instructions.
Most likely you have already created Zones for you network...all you really need to do is create "Aliases" so that when you type "students.myschool.org" your web browser will know that site resides on IP address XXX.XXX.XXX.XXX.
If you've set up Zones then you already have a "Machine" setting that translates your server’s name to an IP address and vice versa.
All you need to do is create an "Alias" (CNAME) record for, in this case, "students". You’ll see the choices for types of records when you click the "Add Record" button.
There are only two fields to configure for a record: "Alias Name" - in this case "students" and "Destination" - in this case "servername.myschool.org". (You've already entered a machine record that says "servername" = 192.168.1.x.)
That's it for Internal DNS.
SERVER SIDE - FTP
Now you have to get iWeb to communicate with the webserver.
There are only three ways iWeb will communicate with webservers: MobileMe, Local Folder and FTP Server.
Local Folder is really only practical if you want to host a website on a laptop (I was blown away initially when I found out that all Macs had a built-in web server - how neat is that?). I think there are some very cool things teachers could do with configuration, and, of course, you wouldn't need to set up any web services on the web server, but that's for another discussion. You need to set up FTP services on the web server.
Turn on and enable FTP on your webserver.
You can leave the defaults for "General", "Messages" and "Logging". "Advanced" is the only thing you want to set. I set "Authenticated Users See:" to "Home Folder Only". I set the "FTP Root" to the same root folder in which I plan to store my web sites (/VOLUMES/RAID Array/WebServer/Documents). This setting sets that folder only to be accessible via FTP.
I would suggest returning to your DNS settings and adding one more "Alias". Set "ftp." to point to your webserver. Why? So folks can edit their sites from home (see below).
CAVEAT: If you are running FTP on other servers, make sure that the settings here do not conflict with the settings on the other servers. For example, I'm running FTP on my file server so that my scanners can communicate with it. However, I configure my FTP settings by machine name and NOT "ftp.myschool.org".
================================================
CLIENT SIDE - CONFIGURING iWEB
Now you have to configure iWeb so that it will communicate with your server.
Click on the "Site" icon so that "Site Publishing Settings" appears.
Publishing:
"Publish to:" = "FTP Server"
You can set the "Site name:" and "Contact email:" to whatever you want. But see below!
FTP Server Settings:
"Server address"=ftp.myschool.org (you could also enter in servername.myschool.org or the IP address. However, if you want folks to be able to work on the site from home, you will need to configure external DNS for that. If you use the IP address, you're out of luck for remote access to the site. (You can do it but it's beyond the scope of this discussion.)
"Username" & "Password" should be your user's network login credentials.
"Directory/Path" - this is important. Remember, you set your "FTP Root" to be "/VOLUMES/RAID Array/WebServer/Documents". If you leave this field blank then the website will be dumped into this folder. If you are only setting up one site, that may be OK. However I wanted to set up a "students" site folder, a "faculty" site folder and a separate site for our literary magazine.
THEREFORE: I have, in my ..../Documents folder (on the server), a "students" folder, a "faculty" folder, and a "litmag" folder.
SO...in my "Directory/Path:" field, I have "/faculty". That means the full path to this website is "ftp root/faculty" or "/VOLUMES/RAID Array/WebServer/Documents/faculty" (You don't need a trailing "/" character. iWeb will automatically append the folder for you user depending on what you entered in "Site Name:" in the "Publishing" area.
Website URL:
This is the root website depending on whether it is "students" or "faculty". Since iWeb will append the site name to this root website, I accomplished what I hoped to accomplish in this post (http://discussions.apple.com/message.jspa?messageID=12288561#12288561).
Faculty sites will be @ http://faculty.myschool.org/username. Students @ http://students.myschool.org/username. PERFECT!
iWeb is such a GREAT tool - NOW the kids can start using it!
I want to reiterate that this works for our school but it should work for you as well. There may be better ways to do this but it works for us.
Hope this has been helpful and you won't have to spend weeks trying to figure this all out by yourself!

OK...here's how we did it.
To get access to the website you created from outside your network there are a couple of steps.
First, you have to have a STATIC IP address from your ISP. If you have a T1 circuit, no problem...you usually get a couple of static IPs you can use. However, if you have a cable modem circuit, most likely you have a dynamic IP address which changes when you connect to the internet. Usually a static IP will cost a bit more because the ISP has to go through a couple of steps to set it up for you. But once you have the address, you now have a way for folks outside your network to connect with you.
(I’m also assuming that you use a router of some sort through which traffic flows out to the internet and that you aren’t using connection sharing or something like that.)
The next thing you need to do is have your new static IP address associated with the server on which you are hosting your website. You've probably already done that if your website works inside your network. However, you've associated a private ip (192.168.x.x, etc.) to your web server. That doesn't mean anything to folks on the outside because private IP addresses are just that - private - folks can't access them. (I won't get into VPN because that's a whole other topic.)
The way you associate your new static IP address to your web server is through some sort of dns application from your ISP. For example, we use TierraNet to manage our external DNS information. They have a web interface control panel that is very similar to the DNS interface for XServer. You can create CNAME records (aliases - other ways that folks can access your servers).
Basically you create an "A" (CNAME) record with a fully qualified domain name (e.g. webserver.myschool.org) and point it to your public IP address (XXX.XXX.XXX.XXX) which you just got from your ISP. It's going to take a while (24-48 hours) for this change to take effect. BTW, you can create as many “A” records as you want. For example mail.myschool.com and wiki.myschool.com could point to the same place.
You want to make sure that the fully qualified domain name you enter in the external dns utility matches the name you used when you created your internal dns records on your XServer.
OK...so now folks can get to your domain - but, remember, you have a private network IP scheme between them and you. You now have to tell your router that when web traffic arrives, allow it inside the network and direct it to your web server.
Let's say your public IP address is 205.100.112.50 and your web server is 192.168.0.5.
You have to create, in your router’s "Security Zone" (router companies call them different things) a couple of rules. Usually the first rule is: "Let everything inside the network get out to the web." You've probably already done that if folks inside the network can reach the internet.
You then have to tell the router to allow web traffic (port 80) into your network AND redirect that traffic to 192.168.0.5.
We use AdTran routers and they have a web interface which allows you to write "rules" affecting public and private traffic. Public is folks outside the network, private is folks inside.
AdTran calls them "Security Zones" and you modify those zones with policies.
So my "Policy" would say, in the above example, redirect traffic from my public IP (205.100.112.50) -> to my web server -> (192.168.0.5).
THEN you have to modify this policy with what AdTran calls "Traffic Selectors". You've said, OK, you can get in, but WHAT can get in?
The "Traffic Selector" is written to say: "Permit" "TCP" traffic from 205.100.112.50 only through Port 80. (That's the port that web traffic goes over. If you wanted a secure website, you'd add another traffic selector that opens port 443, for example.)
I'll tell you I'm no genius when it comes to this. I called AdTran and had them configure my router for me. I told them what I wanted done, they remoted into the router and configured it. But then I could go to the web interface and see what they did and then added rules later on when I wanted, for example, to get access to the network via Apple Remote Desktop or VPN into the network on my iPad.
I'd bet that your router has a maintenance agreement that includes this service and if it doesn't it should have.
I did find that I still had issues when I tried to set this up originally and it had to do with the ORDER of the policies. I can’t remember exactly what the issue was, but, effectively one of the policies highjacked traffic before the policy that I wanted got triggered. Simply moving them around in the list fixed that issue. So if you have this set up but still can’t access the site, check the order of your rules.
I don’t know if that helps or not, but I try to think about this stuff conceptually and then get someone to help me with the details. I work with this stuff so infrequently that I forgot how I did something 6 months or a year ago. I’m in the process of creating a wiki for the school which documents all this stuff, but that’s a major undertaking.
Cheers,
John

Dynamic DNS issues and/or confusion

I work for a small university. We have two domain controllers running on Windows 2008 (not R2). On dc2 we have a DHCP server running serving several VLANs across campus. We've been having issues where the dynamic DNS entries contain an
incorrect IP address for several machines. In some cases there are even several entries for a single machine. I've notice two main issues by looking at the DNS server. First, old entries aren't being cleaned up. Second, after re-imaging
a workstation the DNS entry for that machine is not being updated. After doing some research I came across the blog entry from Ace Fekay on how to go about setting up dynamic DNS. I immediately determined from reading that scavenging was not setup
properly on our server. I think I've corrected that problem, but I'll have to be patient and see what happens over time. This brings me to the issue of machines not adding themselves or updating their records in DNS.
After reading Ace's blog I decided to follow his recommendations for configuring dynamic DNS. I created a normal active directory user to use for configuring the DHCP credentials (it appears our server was set to use domain administrator previously).
I added the DHCP computer object (this is also one of our domain controllers) to the DnsUpdateProxy group. On the DHCP server I have checked "Enable DNS dynamic updates according to the settings below" along with the "Always A and PTR
records when lease is deleted". I also checked "Dynamically update DNS A and PTR records for DHCP clients that do not request updates...". After doing all of this I rebooted the dc2 server. I then manually deleted all of the
existing dynamic entries on the DNS server, so they could properly be recreated. Now, here is the problem after setting all of this up. I'm now seeing student's personal machines, phones, tablets, etc. being populated in our DNS. Before making
these changes only domain joined machines existed in DNS. Our DNS is configured to allow only secure updates. Why is it that now non domain trusted devices are being allowed to create DNS entries? I was under the assumption that secure updates
meant domain only. Am I not understanding something properly here? Can someone please provide me some insight to what's going on and what I might be able to do to prevent non-domain joined devices from having entries created in DNS?

Hi,
According to your description, my understanding is that non domain trusted devices have been registered their DNS entries in DNS which is configured to allow only secure updates.
If a DHCP server that is running on a domain controller is configured to perform dynamic updates on behalf of its clients, that DHCP server is able to take ownership of any record, even in the zones that are configured to allow only secure dynamic update.
This is because a DHCP server runs under the computer account, so if it is installed on a domain controller it has full control over DNS objects stored in the Active Directory.
DHCP server will perform dynamic updates on behalf of its clients when you enable the option "Dynamically update DNS A and PTR records for DHCP clients that do not request updates...", and this means that the “owner” of the DNS entries is
DHCP server, not the clients. And the zone accepts the DHCP server’s update because the server has full permission.
You may try to uncheck the option "Dynamically update DNS A and PTR records for DHCP clients that do not request updates...".
Best Regards,
Eve Wang
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected].
Hi Eve,
You are correct in your understanding that "non domain trusted devices have been registered their DNS entries in DNS which is configured to allow only secure updates." I also made a mistake in my original post. I meant to say that I also
had "Always dynamically update DNS A and PTR records".
Now back to your reply. Are you saying that if I had my DHCP server running on a non-domain controller that I would be seeing a different behavior in regards to permissions of DNS objects and that I wouldn't be experiencing the behavior of non domain
trusted devices being created in a secure zone? I thought setting the DNS dynamic credentials to a normal user account was supposed to help with security concerns in regards to DNS objects. What would happen if someone named their personal computer
the same name as one of our file servers or even a domain controller? Would the DHCP/DNS server actually have the power to overwrite that record in DNS?
I'll try your recommendation of unchecking the "Dynamically update DNS A and PTR records..." option and see what happens.
Thanks for your reply...

How to set classpath from java class ??

I have tried to use System.setProperty("java.class.path", "my class path string ") to set classpath dynamically. But it is not working. How to set it dynamically from java class ?? Thanks , gary

Look into the java.net.URLClassLoader. You can't set the classpath after the fact but you can specify URL's that will checked when you try to load a class with that loader.

Setting up SLS & DNS in particular

I would really appreciate some step-by-step guidance on setting up SLS and DNS in particular. I've read all Apple's documentation and dozens of guides and discussions but remain confused about several points, and my set-up still isn't working correctly.
I have the latest SLS on a Mac Mini, which is behind my Draytek 2820vn router. I have 3 Mac clients (all 10.6.6) and 3 OSX devices. I primarily want to share address books and both share and sync (between devices) iCal. I want to be able to do this from outside my LAN, so need to run Mobile Access.
I have a static IP address from my ISP, to which my sub-domain (e.g. network.mydomain.com) points via DNS with my domain registrar.
I seem to have DNS running ok on the server, at least for my LAN (the -checkhostname and dig commands all return the right results). I can get my clients to log on to the network from within the LAN but not get iCal or the address books playing along.
I have enabled port redirection in my router for:
* iCal Server SSL on 8443
* Address Book Server SSL on 8843
* DNS on 53
* Web service on 80
* HTTPS on 443
I prefer to use SSL for maximum security (though am not sure if I also need to open up the non-SSL ports for these services).
So my questions are:
1. Do I need to redirect any other ports?
2. Do I need a reverse DNS with my ISP (i.e. external to my LAN), for the services I am wanting to run?
3. Do I have to enter the static IP address of the SLS in my router as the primary DNS, with my external DNS as the secondary? (I have done this.)
4. How should I configure the firewall on SLS, given its location behind the Draytek? I want a very secure set-up.
5. Does anyone have any other pointers on getting everything to work with this particular arrangement?
Many thanks for any expert feedback. Please note that I'm pretty Mac-proficient for a amateur, but have never set up a server before, so have a limited grasp of the lingo and things like command line.
Many thanks.

* iCal Server SSL on 8443
* Address Book Server SSL on 8843
* DNS on 53
Close that DNS port. You don't want to be fielding in-bound DNS translations.
* Web service on 80
Unless you're planning to serve web sites, close that.
* HTTPS on 443
Ibid.
I prefer to use SSL for maximum security (though am not sure if I also need to open up the non-SSL ports for these services).
[What IP ports need to be opened|http://support.apple.com/kb/ts1629] depends on what services are required, and whether or not you're using a VPN.
1. Do I need to redirect any other ports?
That's one only you can answer, as it is dependent on what you want to do here.
A different question that you want to consider for cases such as this is "how can I close more ports?".
The usual answer is via VPN.
One of many other answers can include a firewall with DMZ capabilities, and a network where you park the server in its own network jail. (A DMZ is a two-firewall firewall box; where you can have an untrusted WAN network, a slightly trusted but still restricted DMZ, and a more trusted internal LAN.)
2. Do I need a reverse DNS with my ISP (i.e. external to my LAN), for the services I am wanting to run?
For secure services, you'll want reverse DNS. That can include ssl services, though (with control over your clients and the boxes that are attempting to connect your LAN) it's not critical.
Reverse DNS is (far) more central to SMTP services, and to ecommerce, and to any cases where you don't control the remote clients, and where the clients are thus dependent on your forward and reverse DNS, and your certificates matching your DNS.
You need LAN-based DNS with Snow Leopard Server, either on the server or with another DNS server on your LAN. [Here is how to set up LAN DNS|http://labs.hoffmanlabs.com/node/1436]
Your ISP will not typically be in a position to provide DNS translations for the private address space. (That's shared and non-routed IP address space, so your ISP would needs to set up DNS for you.)
3. Do I have to enter the static IP address of the SLS in my router as the primary DNS, with my external DNS as the secondary? (I have done this.)
I don't run hosts as gateways. That's more work, and it's less secure.
4. How should I configure the firewall on SLS, given its location behind the Draytek? I want a very secure set-up.
There's no direct answer for that, and there are many different network designs and many different degrees of risk aversion and different degrees of budgets. For some environments, I run locked down. For others, not so much.
5. Does anyone have any other pointers on getting everything to work with this particular arrangement?
[Here is how to set up LAN DNS|http://labs.hoffmanlabs.com/node/1436], and [here is the public-facing DNS set-up|http://labs.hoffmanlabs.com/node/1594] and [here is a quick intro to networking pieces and parts|http://labs.hoffmanlabs.com/node/275].

How to set up a mail server with a private DNS and relay over a public mail

How to set up the mail server that we can send and pick up emails inside and outside?
Our private network has the DNS name dnsname1.private.
We have our privat DNS Server and he can forward requests to outside over our router.
Our public emails are hosted by an internet provider. This dns name is dnsname2.com and dnsname2.org.
How we have to set up our mail server that we can pick up our emails from our public dnsname2.com?
And when we write an email how we have to set up it that the dnsname is dansname2.com and not dnsname1.private?

If you want to move your mailservice to your own (internal) server, start by making sure you can recieve traffic on port TCP 25 (SMTP). Some ISPs blocks this port, especially on "non business" connections.
Can you send mail from your LAN directly to where your mail is hosted using port 25 TCP or do you have to relay via your ISP?
You have a static public IP?

How to set up dynamic dns?

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