1. The DNS web interface
The Interface for Hosts Update is the preferred mechanism for updating the Oxford University hosts database.
If you are a departmental or college network administrator who wishes to use this scheme you will need to apply for a password from email@example.com.
<->number mapping for hosts. For instance, IP address
foo.misc.ox.ac.ukmay act as the webserver for the college, and thus a CNAME entry pointing
www.misc.ox.ac.ukat that machine can be put in. Note that the alias points at a name, not a number.
These allow for mail addressed to one host to be handled by a different host,
for instance all mail addressed to
foo.misc.ox.ac.uk will be sent
bar.misc.ox.ac.uk. Note that this will not affect the
username portion of an email address
only allows one to perform per-hostname filtering.
The record name need not
exist as an A record; while the A record
mail.misc.ox.ac.uk might not
exist, it can exist as an MX record, ensuring that any mail to addresses with
mail.misc.ox.ac.uk to the right of the "@" sign is directed to a mail
An MX record may point to multiple hosts, in which case systems will
attempt to pass on mail in order of priority should the primary mailserver be
oxmail.ox.ac.uk will act as the secondary
mailserver. A name in an MX record must not be a CNAME
2. DNS technical Rules and Guidelines
These are a set of guidelines used in assigning DNS entries, and which must be adhered to by network administrators. The official University rules are available on the ICT site.
The official contact address for all DNS-related queries is firstname.lastname@example.org. You should receive an autoreply giving you a ticket number; please keep it in the subject line of all subsequent correspondence relating to your request or query.
University IT Regulations
ox.ac.ukdomain must be present for all hardware assigned and using IP addresses within the ranges assigned to Oxford University.
This includes printers and network hardware, especially if they are sending or receiving
packets via the University backbone (from time to time packets may leak onto the backbone
even if you do not expect them to). Lack of DNS entry may result in access being denied to
certain services; moreover it makes it easier for OUCS and external sites to identify
machines in the event of problems. Obviously machines on private networks within
departments (using "private" IP address ranges such as
10.0.0.0/24) need not
be registered in the DNS, but any gateway/firewall connecting them to the University
network must be registered.
Network Advisory Group
library-public.ox.ac.uksubdomain in an effort to prevent their being used to access central email services.
www.longunitname.ox.ac.uk), but other machines will remain within the standard unit name.
IT support staff may self-register here.
3. Windows Active Directory and DNS
Some Windows services, in particular Active Directory, require that the DNS servers support SRV (service) records and prefer also that dynamic updates are supported.
While the main Oxford DNS servers can in principle handle SRV records, dynamic update requests from Windows clients are best handled in a secure manner by the Microsoft DNS server software.
In view of this and other operational considerations, the decision was taken that each unit wishing to use Active Directory services operate its own local Windows DNS server. Notes and minutes relating to the relevant meetings may be found on the Active Directory pages.
The delegations will be made to one or two servers within your own unit. Server delegations should be registered via the DNS web interface in the usual way.
Refer to the instructions on Installing and Configuring Windows DNS to Support Active Directory together with the Active Directory pages for further information and full details of configuring DNS to support both configurations.
3.2. Disabling dynamic DNS registration
By default PCs running Windows 2000 and above (both workstation and server products) will try to register their name and IP address in the DNS each time that they boot up. To minimise the extra load that this will cause on the Oxford DNS servers, we'd be grateful if you would turn this option off when you install Windows XP, Vista etc. Never disable this setting on domain controllers as this will also stop them registering their service records.
To disable automatic registration after Windows has been installed, open the
[Network] control panel, bring up the
[Properties] box for the
Local Area Connection, open the
[Properties] for TCP/IP, go
[Advanced/DNS] and turn off the option
[Register this connection's
addresses in DNS]. You can also disable registration during a custom install of
XP by going into the
[Properties] of TCP/IP at the appropriate point in the