12-20-2003
Yes you would use the standard syntax.
If your current isp is doing your dns, it also has the reverse entries setup. Who will be doing your dns after you switch? Your new isp? If so it will need to set up the reverse entries.
Keep your eye on the prize. Anyone is the world needs to be able to take your fqdn and get your ip address. And anyone in the world needs to be able to take your ip address and get your fqdn. This means that anyone in the world needs to be able to contact your primary dns server and your secondary dns server. After the switch you will need these two internet visable boxes. Are you clear on that? Do they exist? You worry me with this talk about using a hosts file. Let's take an imaginary example and walk it though....
Now let's say that you're currently using Joe's ISP Service and you plan to switch to Steve's ISP service. And let's say that you have a box called mailguy.something.com with an IP address of 1.2.3.4 and you need to change that to 5.6.7.8.
Joe is running your current nameservers. So his nameservers are authoritative for all of something.com. And his nameserver's are authoritative for 1.2.3.4. So Joe can do both your forward and reverse entries for you.
Now Joe can enter your new forward entry. But Steve is authoritative for 5.6.7.8. Steve would need to do the reverse entry. If Steve does not do DNS, he could delegate the address to your nameservers. Then you could do the reverse. I suppose that Steve could delegate it to Joe too in theory, but that would be an odd thing to do.
But you need to get something.com off of Joe's nameservers. Joe would then continue to handle any reverse entries for Ip addresses that he owns. If you need to continue using Joe's nameservers after you switch to Steve's ISP service, Joe may charge a large fee or something.
10 More Discussions You Might Find Interesting
1. IP Networking
I'm trying to create a reverse lookup file. Below are the error messages I get in the messages file, when I start named. Below the error messages is a copy of the reverse lookup file I'm trying to use. I'm using Bind version 8.1.2. Would someone recommend the correct values and if you see any... (2 Replies)
Discussion started by: Westy564
2 Replies
2. IP Networking
our server (solaris, bind v 8.1.2) is suppose to be the authoritive or the master and our isp's server is suppose be the secondary. i've created a reverse lookup zone file and added an entry for it in my named.conf file. i've restarted the dns daemon and i don't have any errors in... (1 Reply)
Discussion started by: Westy564
1 Replies
3. UNIX for Dummies Questions & Answers
We have Unix configured as our external DNS, forward DNS is working properly, however Reverse lookup is not working. Any idea what the problem is? I have checked the named.boot and .rev file and everything seems to be correctly. However it appears that the reverse zone file in the named.boot... (2 Replies)
Discussion started by: cassy
2 Replies
4. IP Networking
Help having problems accesing various sites that require me to be a registered .gov domain. My IP is a registered as an .gov but my nameserver record has changed on my DNS configurartion(I don't know why) from something.gov to somethingelse.gov. Same IP, though.
When a reverse lookup is... (1 Reply)
Discussion started by: jpalmer320
1 Replies
5. UNIX for Advanced & Expert Users
Write a quick shell snippet to find all of the IPV4 IP addresses
in any and all of the files under /var/lib/output/*, ignoring
whatever else may be in those files. Perform a reverse lookup on
each, and format the output neatly, like "IP=192.168.0.1,
... (0 Replies)
Discussion started by: choco4202002
0 Replies
6. Shell Programming and Scripting
hey guys,
can anybody help me out here on the following:
grep '^\{1,3\}\.\{1,3\}\.\{1,3\}\.\{1,3\}$' ravi.txt mary.txt lisa.txt https://www.unix.com/images/misc/progress.gif
i.e what i did was found ip addreses from different files
and then i want... (1 Reply)
Discussion started by: ravis83
1 Replies
7. UNIX for Advanced & Expert Users
Originally I had the server at home and on Comcast so I used dyndns.org for DNS.
Once the server got a bit more popular, I leased a server at a colo facility. They set up the server name in their DNS so I didn't really have any reason to manage my own DNS. DynDNS was managing the domains and I... (7 Replies)
Discussion started by: BOFH
7 Replies
8. Shell Programming and Scripting
Hi,
I have log file name that shows the view name and some SQL statement time
stamp. I want to summarize the SQL time with view. Here is the simple example
Here the seqence is first it prints EventContext and all the SQL statement time and again EventContext. Want to summarize the time for... (5 Replies)
Discussion started by: ran123
5 Replies
9. UNIX for Dummies Questions & Answers
I came back to my solaris 10 system after a week of being gone and xterm no longer work. I checked into it and the system doesn't reverse lookup my client system. There is a manual entry for my system in the /etc/hosts file and a forward lookup works fine, but I still can't get reverse lookup. Any... (0 Replies)
Discussion started by: clogan1981
0 Replies
10. Red Hat
Hi guys. Ok so let me lay out my configs. I can do a NSlookup from client to server BUT NOT a reverse lookup.
DNS server: Optimus.jaydomain.com
IP : 192.168.1.50
DNS Client: Megatron.jaydomain.com
IP : 192.168.1.60
On Sever:
# cat /etc/named.conf
//
// named.conf
//
// Provided... (4 Replies)
Discussion started by: Junaid Subhani
4 Replies
LEARN ABOUT MOJAVE
unbound
unbound(8) unbound 1.5.1 unbound(8)
NAME
unbound - Unbound DNS validating resolver 1.5.1.
SYNOPSIS
unbound [-h] [-d] [-v] [-c cfgfile]
DESCRIPTION
Unbound is a caching DNS resolver.
It uses a built in list of authoritative nameservers for the root zone (.), the so called root hints. On receiving a DNS query it will ask
the root nameservers for an answer and will in almost all cases receive a delegation to a top level domain (TLD) authoritative nameserver.
It will then ask that nameserver for an answer. It will recursively continue until an answer is found or no answer is available (NXDO-
MAIN). For performance and efficiency reasons that answer is cached for a certain time (the answer's time-to-live or TTL). A second query
for the same name will then be answered from the cache. Unbound can also do DNSSEC validation.
To use a locally running Unbound for resolving put
nameserver 127.0.0.1
into resolv.conf(5).
If authoritative DNS is needed as well using nsd(8), careful setup is required because authoritative nameservers and resolvers are using
the same port number (53).
The available options are:
-h Show the version and commandline option help.
-c cfgfile
Set the config file with settings for unbound to read instead of reading the file at the default location,
/usr/local/etc/unbound/unbound.conf. The syntax is described in unbound.conf(5).
-d Debug flag: do not fork into the background, but stay attached to the console. This flag will also delay writing to the log file
until the thread-spawn time, so that most config and setup errors appear on stderr. If given twice or more, logging does not switch
to the log file or to syslog, but the log messages are printed to stderr all the time.
-v Increase verbosity. If given multiple times, more information is logged. This is in addition to the verbosity (if any) from the
config file.
SEE ALSO
unbound.conf(5), unbound-checkconf(8), nsd(8).
AUTHORS
Unbound developers are mentioned in the CREDITS file in the distribution.
NLnet Labs Dec 8, 2014 unbound(8)