Configuration option for IPv4/IPv6 resolution with DNS resolutions

Parameters that can be used to configure DNS host names can be transmitted with a switch that specifies how to prioritize IPv4 or IPv6 when a connection is established.

Specific use cases are, for example, the use of DNS names in VPN connections or SIP registrars, where you need to control whether the connection is established via IPv4 or IPv6.

Example 1: If the host name vpn.example.org is resolved to an IPv4 and an IPv6 address, a host usually prefers IPv6 over IPv4. However, if IPv4 is to be used, this can be controlled by appending ?4 to the host name, i.e. in this case: vpn.example.org?4.

Example 2: If IPv4 is to be preferred for a CLI ping of an IPv4/IPv6 DNS host name, the following syntax can be used: ping www.example.org?4.

The following suffixes are allowed:

www.lancom-systems.com

LANCOM Systems GmbH | A Rohde & Schwarz Company | Adenauerstr. 20/B2 | 52146 Wuerselen | Germany | E‑Mail info@lancom.de

LANCOM Logo