Oleksandr Ivantsiv d1fa414f1b Clear DNS configuration received from DHCP during networking reconfiguration in Linux. (#13516) (#13695) ... - Why I did it fixes #12907 When the management interface IP address configuration changes from dynamic to static the DNS configuration (retrieved from the DHCP server) in /etc/resolv.conf remains uncleared. This leads to a DNS configuration pointing to the wrong nameserver. To make the behavior clear DNS configuration received from DHCP should be cleared. - How I did it Use resolvconf package for managing DNS configuration. It is capable of tracking the source of DNS configuration and puts the configuration retrieved from the DHCP servers into a separate file. This allows the implementation of DNS configuration cleanup retrieved from DHCP during networking reconfiguration. - How to verify it Ensure that the management interface has no static configuration. Check that /etc/resolv.conf has DNS configuration. Configure a static IP address on the management interface. Verify that /etc/resolv.conf has no DNS configuration. Remove the static IP address from the management interface. Verify that /etc/resolv.conf has DNS configuration retrieved form DHCP server.		2023-02-10 09:11:05 -08:00
..
init_interfaces	[sonic boot] disable dhcp during boot up, until updategraph service is running (#2316)	2018-11-29 08:34:22 -08:00
interfaces-config.service	[services] introduce sonic.target (#5705)	2021-02-25 14:26:24 +02:00
interfaces-config.sh	Clear DNS configuration received from DHCP during networking reconfiguration in Linux. (#13516) (#13695)	2023-02-10 09:11:05 -08:00
interfaces.j2	Upgrade to ifupdown2 3.0.0 with a patch to fix using broadcast addresses	2021-08-12 23:18:01 -07:00