Rv042 dyndns updating
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The following steps only illustrate how to turn off dynamic DNS updates on Microsoft Windows systems.
Over 97% of DNS updates that leak onto the global Internet come from Microsoft Windows operating systems (see companion paper on The Windows of Private DNS Updates).
The following Modular Exponential (MODP) and Elliptic Curve (EC2N) Diffie-Hellman (also known as "Oakley") Groups are supported: More on standards can be found here.
To avoid problems with IKE packets hit some SPD rule and require to encrypt it with not yet established SA (that this packet perhaps is trying to establish), locally originated packets with UDP source port 500 are not processed with SPD.
Microsoft Windows operating systems support a feature that dynamically updates the mappings of domain names to associated IP addresses assigned to hosts by DHCP servers.
This automatic updating, called Dynamic DNS Updates service, reduces the administrative overhead associated with manually administering DNS records of network hosts.
Similarly, steps 6-8 update the inverse mapping from the IP address to the domain name (type PTR RR).
In the correct setup, the LDNS should point the DHCP client to a domain name server (could be itself) inside the internal network.
Internet Protocol Security (IPsec) is a set of protocols defined by the Internet Engineering Task Force (IETF) to secure packet exchange over unprotected IP/IPv6 networks such as Internet.
IPsec protocol suite can be divided in following groups: The Internet Key Exchange (IKE) is a protocol that provides authenticated keying material for Internet Security Association and Key Management Protocol (ISAKMP) framework.
The following list illustrates a typical example of how a private DNS update leaks out to the global Internet. The DHCP client first sends a query to its local domain name server (LDNS) and asks for the authoritative server for the zone of its domain name (step 3).
Once the DHCP client receives a response (step 4), it sends the update to the indicated server (step 5).
The same way packets with UDP destination port 500 that are to be delivered locally are not processed in incoming policy check.