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81
votes
6answers
159k views

List all DNS records in a domain using dig?

My company runs an internal DNS for mycompany.com There is a machine on the network that I need to find, but I’ve forgotten its name. If I could see a list, it would probably jog my memory. How ...
15
votes
5answers
86k views

How do I determine what my DHCP server is?

I have a sad network left behind by some careless admins - I am in process of figuring out exactly what services are running where, not excluding the possibility that some services are running from ...
14
votes
2answers
1k views

Should engineering have its own DNS zone, delegate, or subdomain?

We have our organization's primary domain (with AD) example.com. In the past, previous admins have created several other zones - such as dmn.com, lab.example.com, dmn-geo.com etc - as well as ...
11
votes
13answers
14k views

Using .local for internal websites [duplicate]

Is it okay to use app.mycoolname.local for URLs that are private / internal? We have several applications that are web based, but they are private apps and are not exposed to the public. We have ...
10
votes
1answer
7k views

What is the point of the zones.rfc1918 file for Bind9?

Using an Ubuntu 10.04 LTS server in a standalone environment and trying to use views to serve two different subnets of clients. Getting errors regarding the zones.rfc1918 file, so I'd like to know ...
9
votes
4answers
9k views

Querying DNS for CNAMEs for a server

Is there a way to query our internal DNS entries to discover all the CNAME entries that point to a particular server? Edit: We're a Windows environment, Server 2003.
9
votes
1answer
264 views

What are the practical risks of enabling the unsecure DNS updates on Windows?

What are the practical risks of enabling the unsecure DNS updates on Windows? As far as I found enabling the unsecure DNS updates is a requirement for enabling DHCP Linux clients from registering ...
8
votes
3answers
721 views

Enterprise internal URL conventions

developer here... I'd like your IT perspective on this one... I'm building a new internal web app for my company, and starting to think about how it will be deployed. Many of the existing web apps ...
7
votes
5answers
5k views

Resolving host names to their domain name in an internal BIND domain

I'm setting up a domain on my home network for learning purposes, using BIND on CentOS to act as the name server. I've got the name server up and running as type master for my internal domain ...
6
votes
3answers
10k views

Two Different Domains & Domain Controllers on Single Network

I'm attempting to determine whether it is possible to have two Active Directory domain controllers running on the same network, within the same subnet, with two separate domains. I do not want these ...
5
votes
8answers
13k views

Is there a reason to use internal DNS over 8.8.8.8?

I've inherited a LAN where there is really no name resolution being done for local resources... i.e. all users enter IP addresses manually to access printers and network shares. There are no LDAP ...
5
votes
6answers
4k views

How to intercept and manipulate DNS queries?

I'm not sure if I worded the question correctly to be honest but basically what I want to do is: When a user types in something like Expenses in the URL bar of a browser, I want the browser to be ...
5
votes
3answers
475 views

Can Windows 2008 DNS assign 2 host names to one IP address

One of my windows admins claimed: "Windows 2008 DNS server can't assign 2 names to one IP address". Besides the fact that you could use a CNAME to accomplish that, I'm sure (having worked with all ...
5
votes
2answers
148 views

Run local dns-server that forwards dns querys to different dns nameservers

I would like to run my own local dns-server, that forwards only some dns-queries to special dns-servers and all others to the public google dns servers. The database of the local DNS-Server should ...
5
votes
4answers
6k views

Private DNS zone that resolves private subdomains, and forwards to public nameserver for existing public subdomains

I have a TLD with a series of subdomains that are public, say *.example.com. I also have a private server which is used as a SVN repository, which I would like to have available at svn.example.com, ...
5
votes
1answer
4k views

How should DNS be configured for remote VPN access to a Windows Domain?

Suppose you have a small windows domain configured as follows: domain name is ad.example.com (as per these guidelines) DC1 is at 10.10.10.3 DC2 is at 10.10.10.4 DC1 and DC2 are running the ...
5
votes
1answer
1k views

IPv6 over Cisco IPSec VPN?

We use a Cisco ASA 5505 as the firewall and IPSec VPN endpoint on our network. We use split-tunneling to reduce the load on our internet link. In other words, when someone is connected to the VPN ...
4
votes
2answers
7k views

Override a DNS record using BIND9?

Sorry if this has been asked before, but I can't seem to find any information specific to my case. I run a server where users can connect with a Nintendo DS game if they change their DS' primary DNS ...
4
votes
3answers
538 views

Do we need a DNS server when we use OpenDNS?

I am in the process of splitting roles up from one server to 5. The current server is running as a DNS server, among other things. The DNS server just has a forwarder to the OpenDNS IP addresses and ...
4
votes
7answers
1k views

What service do you use to manage DNS?

What service do you use to manage your DNS? I don't really want to use the DNS manager that is provided with website hosting company. Is there any reliable and fast DNS manager service? I found a ...
4
votes
2answers
8k views

Hosting multiple domains on a single email server with one IP

I have an email server (mail) that currently hosts one domain example1.com. The server is behind NAT and I have split-dns configured on the LAN. The time has come to host additional domains on the ...
4
votes
2answers
2k views

NAT Reflection, or Split DNS?

I'm working on a network restructure that has three geographical locations, but will share some services. Two of the locations have workstations, and one has only servers (in a CoLo facility). We will ...
4
votes
1answer
2k views

Using PowerShell, in Active Directory, how would I change all the DNS A records that have a given IP to a new IP?

We've been moving data centers and I have a lot of old records that were not correctly but in DNS as CNAME records, but A records that have a direct IP (e.g. 192.168.100.n) and they're all moving to a ...
4
votes
3answers
322 views

Windows DNS: Is there a way to partition a domain based on subnets

In our organization, we have two separate groups which share network address space and a domain. A couple of slices of /24 are allocated to my group, while the rest is allocated to our internal IT ...
4
votes
1answer
3k views

Access libvirt+KVM virtual machines with DNS

I have an Ubuntu Trusty machine running KVM + Libvirt to manage small virtual machines, and using the standard NetworkManager to connect to regular networks. I want to be able to access the virtual ...
4
votes
2answers
5k views

Microsoft DNS: Provide different answers per-src-subnet to same query - do I need full split horizon/brain?

I have a network with two vlans, both of which refer to my AD server(s) for DNS. Some servers on this network are multi-homed. Lets say we have the two subnets A: 192.168.7.0/24 and B: ...
4
votes
4answers
1k views

Don't automatically include all subdomains in DNSMasq address

It is possible to configure DNSMasq such that it returns a fixed IP address only for a request for that exact domain, and not for its subdomains? That is, I want it to return a fixed IP when resolving ...
4
votes
2answers
7k views

IPSec tunnel between FortiGate and iPhone / iOS - Works except for DNS / Wins

I have configured my Fortigate with a new VPN IPSec tunnel to allow the iOS Cisco client to connect. That works fine. I can RDP to my servers, browse to my servers via IP address, etc. But, the ...
4
votes
0answers
336 views

Why can DNS server not resolve any domain ending in .io?

I have two windows domain controllers. 10.10.10.10 Primary ( win 2008 r2 ) 10.10.10.20 Replica ( win 2012 r2 ) The second one is configured as a replica of the first. About once per week, the ...
4
votes
0answers
242 views

Samba4 internal DNS and isc-dhcp zone update

Could anybody explain, how to solve this problem with internal samba4 DNS and dynamic zone updates from isc-dhcp? In the logs I have: dhcpd: Unable to add reverse map from ...
3
votes
5answers
360 views

How to convince a corporation to use DNS? [closed]

This is not the first time in my life when I have to convince a smaller corporation about using DNS service instead of /etc/hosts files and IP addresses. It might seem silly/funny at the first time, ...
3
votes
3answers
510 views

Windows Server 2008 Active Directory DNS setup

I have to setup a small windows network inside my bigger linux/mac infrastructure. In order to get the windows clients logging onto the domain, I have had to make the DC their primary DNS server, ...
3
votes
3answers
28k views

How To Properly Setup DNS Forwarders On Windows Server

I was wondering how to properly setup DNS forwarders on Windows Server 2008 R2. I have three Domain Controllers. Each of the DC's have have following: AD Role DNS Role DHCP Role Static IP Address ...
3
votes
4answers
10k views

DNS A record pointing to private IP address [duplicate]

I own a domain. I will call it example.com. I want to set up a local BIND server on my private network. I have a box with the private IP address of 192.168.2.13 I would like to have this box named ...
3
votes
2answers
5k views

Difference between /etc/hosts and /etc/resolv.conf

What is the difference between /etc/hosts and /etc/resolv.conf? Also, is there a good documentation that explain all these configuration files. Thank you. Bala
3
votes
2answers
6k views

IP address used by nslookup and ping is different

I have a web server hosted in the network. It has a domain name registered. However, I also host a DNS server for the LAN. So, when someone wants to access the web server, it would check the DNS ...
3
votes
5answers
9k views

Internal DNS with DLINK Router

Using a DLink 2640-T (ADSL2+Router). It cant resolve the internal hostnames. The manual is pointing to the firewall settings of the router to switch off the DNS-Blocking from external (which doesnt ...
3
votes
3answers
198 views

huge slowdown in network of 40 nodes when local DNS is up

We have a LAN with ~40 workstations (mostly Windows) and a couple of servers. All of them use an internal DNS (196.168.0.4 running BIND 9.5.0-P2) and a gateway (192.168.0.1 running OpenBSD Packet ...
3
votes
1answer
2k views

How to forward missing DNS names of an existing zone in Windows DNS server?

I have setup DNS records for a public domain (say example.com) in my public DNS provider. Among the records, there are some A records of the type *.production.code.example.com that point to a specific ...
3
votes
1answer
2k views

external dns to internal dns

I have a local DNS server inside my network and have set up a few A Name records to some of my internal sites (i.e. app1.domain.com, app2.domain.com) and the dns resolves internally and loads the ...
3
votes
3answers
337 views

How can I search Domain Integrated DNS Entries

Example: I have a server named server1.domain.local I have lots of CNAME entries in various forward lookup zones pointed to server1.domain.local I want to decomission server1, and have a new server, ...
3
votes
1answer
1k views

Using a single-level domain for Active Directory [duplicate]

It's common convention to name a domain something like companyname.local for internal Active Directory with integrated DNS. I'm in a situation where the company name has changed and I would like to ...
3
votes
3answers
774 views

DNS consolidation, how to serve both internal network and the internet

Currently we have a following setup. We have two domain controllers which also serve as DNS servers, used as resolvers by local clients. We also have external autoritative DNS servers for exact same ...
3
votes
3answers
626 views

Local DNS Response Time Problem on SBS 2008

The problem: LAN client computers ping remote.mydomain.com and it resolves to our static, WAN IP Address. It should resolve to our server's local LAN IP Address. The Details: We have a total of one ...
3
votes
1answer
11k views

BIND9 forwarders not working. Internal DNS resolves but doesn't forward requests it can't process

I have BIND9 set up with proper recorders for my domain example.com, something.example.com is actually working... When I have my DHCP server pointing at this DNS server I can get to webmin ...
3
votes
2answers
4k views

Windows XP Does Not Follow CNAME Shares

I am supporting a mix of Windows XP Pro and Windows 7 desktops in my Active Directory network, and I am having an odd issue with XP and CNAME records. Say I have a record in my DNS for a server with ...
3
votes
1answer
1k views

unbound/nsd returning SERVFAIL resolving local LAN DNS. nsd alone works fine

I've been using unbound as a local recursive DNS server. Just added nsd to set up local LAN DNS. nsd is listening on port 53530 and that works fine: $ dig @127.0.0.1 data2.datanet.home -p 53530 ; ...
3
votes
1answer
151 views

Prevent Server 2003 DNS from caching Failed Lookups

We have a Server 2003 running DNS with Root Hints but with some forwarders for specific domains that contain private services. The DNS servers for the private services are on site to site links, and ...
3
votes
3answers
4k views

Windows 10 vpn change the dns settings

My Windows 10 VPN IPv4 Properties button does not work. Others have found this too. There are powershell workarounds for changing default gateway options, e.g. Set-VpnConnection -Name ...
3
votes
1answer
1k views

DNS split domain architecture while retaining access to split zones

Like most organizations, we maintain various split domains for a verity of reasons. Due to what we do, we frequently use the same name in different instances of the domain to point to different ...