How do I prevent DNS zone transfers?

How do I prevent DNS zone transfers?

How to secure AXFR zone transfers? The simplest way to secure zone transfers is to restrict AXFR requests to trusted IP addresses. You can do it in your DNS server configuration or on your firewall. You can additionally use transaction signatures.

What triggers a DNS zone transfer?

A server from which zone files are replicated can be either a primary or secondary server for the zone, and is often referred to as a master server. When a secondary DNS server starts up, it initiates a zone transfer from the master DNS server.

Should I allow DNS zone transfers?

Zone transfers are not required for AD integrated zones because the zone is stored in the actual AD database and gets replicated to all DC/DNS servers in the replication scope of the zone (DomainNC partition, DomanDnsZones or ForestDnsZones application partitions).

What is DNS zone transfer attack?

DNS zone transfer, also known as DNS query type AXFR, is a process by which a DNS server passes a copy of part of its database to another DNS server. The client requesting a zone transfer may be a slave server or secondary server, requesting data from a master server or a primary server.

How do I transfer a DNS zone?

Suggested Actions

1. In the DNS Manager, right-click the name of the DNS zone and click Properties.
2. On the Zone Transfers tab, click Allow zone transfer.
3. Select Only to the following servers.
4. Click Edit, then in the IP addresses of the secondary servers list, enter the IP addresses of the servers you wish to specify.

What are the three types of zone transfers?

There are three types of zone transfer to consider:

• Full zone transfer.
• Incremental zone transfer.
• AD replication.

How long does a DNS zone transfer take?

Nameserver changes can typically take 0 to 24 hours to take effect, but they are known to take as long as 48 hours to go into full effect. DNS zone record changes such as A, MX and CNAME records can typically take 0 to 4 hours to resolve but are known to take as long as 8 hours to fully propagate.

What port does DNS zone transfer use?

TCP Port 53
DNS Zone transfers are performed over TCP Port 53. UDP Port 53 performs domain name resolution.

How do you do a zone transfer?

What is full zone transfer?

AXFR zone transfer (Full zone transfer) The Primary DNS server sends the whole zone file that contains all the DNS records to the Secondary DNS servers. This assures that the secondary DNS server is well synced. It will have all the latest changes that were made to the Master DNS zone.

Where does zone transfer from master DNS server come from?

If the master DNS server is a primary DNS server, then the zone transfer comes directly from the DNS server hosting the primary zone. If the master server is a secondary DNS server, then the zone file received from the master DNS server by means of a zone transfer is a copy of the read-only secondary zone file.

How to configure DNS zones only to allow?

1 In the DNS Manager, right-click the name of the DNS zone and click Properties. 2 On the Zone Transfers tab, click Allow zone transfer. 3 Select Only to the following servers. 4 Click Edit, then in the IP addresses of the secondary servers list, enter the IP addresses of the servers you wish to specify.

Is there a way to restrict zone transfers?

Restrict Zone Transfers A DNS zone transfer is just a copy of the DNS zone, and while this technique is often used by slave name servers to query master DNS servers, sometimes attackers can try to perform a DNS zone transfer in order to have a better understanding of your network topology.

How are zone files replicated to multiple DNS servers?

The process of replicating a zone file to multiple DNS servers is called zone transfer. Zone transfer is achieved by copying the zone file from one DNS server to a second DNS server. A master DNS server is the source of the zone information during a transfer. The master DNS server can be a primary or secondary DNS server.