Do DNS zone transfer?
Zone transfer is the process of copying the contents of the zone file on a primary DNS server to a secondary DNS server. Using zone transfer provides fault tolerance by synchronizing the zone file in a primary DNS server with the zone file in a secondary DNS server.
How long does a DNS zone transfer take?
Usually DNS changes will propagate within a few hours, but it can take up to 48 hours for everything to propagate across the Internet. Many things affect propagation time, including your TTL, your ISP and your domain’s registry.
How do I protect my DNS zone transfer?
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. Learn how to use transaction signatures in the BIND DNS server.
Is DNS zone transfer secure?
By default, the DNS Server service only allows zone information to be transferred to servers listed in the name server (NS) resource records of a zone. This is a secure configuration, but for increased security, this setting should be changed to the option to allow zone transfers to specified IP addresses.
What is the description of DNS zone transfer?
transferring blocks of DNS data from a DNS server to another server. the action taken when a DNS server sends a query on behalf of a DNS resolver. forwarding a request from a DNS server in a subdomain to an authoritative source.
How many types of DNS zone transfer are possible?
Zone transfer comes in two flavors, full (opcode AXFR) and incremental (IXFR). Zone transfer operates on top of the Transmission Control Protocol (TCP), and takes the form of a client-server transaction.
What is allow transfer in DNS?
allow-transfer defines a match list e.g. IP address(es) that are allowed to transfer (copy) the zone information from the server (master or slave for the zone). The default behaviour is to allow zone transfers to any host.