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-   -   PTR records on dynamic ipaddress (http://www.linuxquestions.org/questions/linux-networking-3/ptr-records-on-dynamic-ipaddress-511390/)

coolb 12-17-2006 02:38 PM

PTR records on dynamic ipaddress
 
I have been told that having PTR/Reverse DNS records changed on the Name Servers that are authoritative for the IP space that you are on, is totaly a bad idea if you have a dynamic IP address(and even wont work so well, seeing that the PTR mapping would have to be changed each time your IP address changes and then changed back etc <-- which will take to much manual labour, and that is will take 1-7 days for the record to propagate etc etc).

But my question is this: Say your ISP is incharge of the IP space your hosts jump onto(and there DNS Name Servers are authoritative for the IP space) isent there someway that each time you authenticate with your username and password, for your ISP, it automatically dose the PTR mapping?

Thanks
Bruce

TigerOC 12-18-2006 04:20 PM

Have had a look at your blog and you are obviously fairly new to this. (did leave a few observations).
Let's approach this from 2 different angles. Your isp provides you with a connection to their network to get onto the internet. Since you are joining their network you are assigned an ip address via dhcp (changes periodically) or you are assigned a static address.
They have their own DNS servers which connect to higher level DNS servers but keep a database of domain names and their relevant ip addresses so that you are able to find them from your browser.

Now if you want to or are hosting a registered domain name then you to have a way for the major DNS servers to store your ip address. If you have a static ip address this is quite easy as you get the registrar (who maintain the DNS records for the domain name) to point to your ip address. If you have a dynamic address it gets more difficult. You need an intermediate host like dyndns.org . Then you install a script that checks your ip address periodically and then updates the dns server at dyndns and they then update the upstream DNS servers.

chort 12-18-2006 04:35 PM

There is a standard for dynamic DNS updates (i.e. clients updating the servers), but I'm not aware of any ISPs that use it. It's potentially a huge security risk and for no gain to the ISPs. All it would do is make it easier for their customers to send e-mail without using the ISPs servers, which makes it harder to track spam.

coolb 12-19-2006 08:05 AM

Quote:

Originally Posted by TigerOC
Have had a look at your blog and you are obviously fairly new to this. (did leave a few observations).
Let's approach this from 2 different angles. Your isp provides you with a connection to their network to get onto the internet. Since you are joining their network you are assigned an ip address via dhcp (changes periodically) or you are assigned a static address.
They have their own DNS servers which connect to higher level DNS servers but keep a database of domain names and their relevant ip addresses so that you are able to find them from your browser.

Now if you want to or are hosting a registered domain name then you to have a way for the major DNS servers to store your ip address. If you have a static ip address this is quite easy as you get the registrar (who maintain the DNS records for the domain name) to point to your ip address. If you have a dynamic address it gets more difficult. You need an intermediate host like dyndns.org . Then you install a script that checks your ip address periodically and then updates the dns server at dyndns and they then update the upstream DNS servers.

you totally misunderstood me, or I did a bad job of trying to explain.

Bruce

TigerOC 12-20-2006 02:25 AM

Quote:

Originally Posted by coolb
you totally misunderstood me, or I did a bad job of trying to explain.

Bruce

Re-reading the original post - you can have a DNS server running on your system but this cannot and will never alter the isp DNS server. As stated above you would have to use an intermediary which would automatically update their zone records. I have not come across an isp that would allow this.

coolb 12-20-2006 12:59 PM

Quote:

Originally Posted by TigerOC
Re-reading the original post - you can have a DNS server running on your system but this cannot and will never alter the isp DNS server. As stated above you would have to use an intermediary which would automatically update their zone records. I have not come across an isp that would allow this.

dude you are so confused it isent even funny.

nevermind done here

farslayer 12-20-2006 02:11 PM

I agree you did a poor job of explaining what you are trying to accomplish, I'm not sure exactly what you are asking for either..
Also it doesn't help to shoot the messenger (person offering assistance) after the fact.

If you want automated mapping for a dynamic IP address, sign up with a Dynamic DNS provider..
http://www.dynip.com/
http://www.dyndns.com/
http://www.no-ip.com/services/managed_dns/

TigerOC 12-21-2006 02:08 AM

Quote:

Originally Posted by coolb
dude you are so confused it isent even funny.

nevermind done here

Your original question here really doesn't supply any useful info. I should have ignored it and regarded it as "nothing to see here - move along". However I took the trouble to visit your website and also read some of your blog (mostly stuff that should be consigned to the bog rather than a blog) to establish what and why you ask the question. I obviously didn't succeed in reading your mind and you are either unwilling or unable to enlighten me any further so the question is not very important.
I do however have some further observations that might help you in the future but you will probably not appreciate them or follow them up;

1. Your inability to use your home language (spell or construct coherent sentences) is going to hinder you greatly in future;

Quote:

...........isent........
......you haven't sent me anything and if you have I haven't received it yet. Perhaps you meant to say isn't which is an abbreviation for is not.

2. Having read your blog you have a very high opinion of your own ability but most of what you say, shows a total lack of basic knowledge on the subjects you talking about. Therefore do yourself, and other people a favour, and go and do some basic research ( Google is your friend ) before calling other people and organisations fools.

As you say;

Quote:

never mind done here

TigerOC 12-21-2006 02:10 AM

Double post - deleted.


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