6.43rc21 changelog:

*) dhcp - added dynamic IPv4/IPv6 "dual-stack" simple queue support, based on client's MAC address;
*) dhcp - fixed DHCP server stuck in invalid state;
*) dhcpv4-server - added "allow-dual-stack-queue" implementation (CLI only);
*) dhcpv6-server - added "allow-dual-stack-queue" implementation (CLI only);
*) kidcontrol - added dynamic accept firewall rules in order to allow limit bandwidth when FastTrack is enabled;
*) lte - do not allow to remove default APN profile;
*) snmp - added "rssi" and "tx-sector-info" value support for w60g type interfaces;
*) vrrp - improved reliability on VRRP interface configured as a bridge port when "use-ip-firewall" is enabled;
*) w60g - added distance measurement (CLI only);
*) winbox - by default specify keepalive timeout value for tunnel type interfaces;
*) winbox - show "System/Health" only on boards that have health monitoring;
*) wireless - added option for RADIUS "called-station-id" format selection;
*) wireless - updated "germany 5.8 ap" and "germany 5.8 fixed p-p" regulatory domain information;

Other changes since v6.42.3:

*) bridge - add dynamic CAP interface to tagged ports if "vlan-mode=use-tag" is enabled;
*) bridge - added ingress filtering options to bridge interface (CLI only);
*) bridge - added initial Q-in-Q support (CLI only);
*) bridge - allow to make changes for bridge port when it is interface list;
*) bridge - fixed bridge hw-offloading on MMIPS devices (introduced in v6.43rc10);
*) bridge - fixed dynamic VLAN table entries when using ingress filtering;
*) bridge - fixed FastPath for bridge master interfaces (introduced in v6.42);
*) capsman - allow to change "radio-name" (CLI only);
*) certificate - add "expires-after" parameter (CLI only);
*) chr - added checksum offload support for Hyper-V installations;
*) chr - added large send offload support for Hyper-V installations;
*) chr - added multiqueue support on Xen installations;
*) chr - added support for multiqueue feature on "virtio-net";
*) chr - added virtual Receive Side Scaling support for Hyper-V installations;
*) chr - do not show IRQ entries from removed devices;
*) chr - fixed adding MSTI entries;
*) chr - fixed NIC hotplug for "virtio-net";
*) chr - improved boot time for Hyper-V installations;
*) crs3xx - added initial Q-in-Q hardware offloading support (CLI only);
*) crs3xx - fixed ACL rate rules (introduced in v6.41rc27);
*) crs3xx - fixed packet forwarding on SFP+ interfaces (introduced in v6.43rc11);
*) crs3xx - fixed VLAN filtering when there is no tagged interface specified;
*) defconf - fixed missing bridge ports after configuration reset;
*) dhcpv4-server - do not allow override lease "always-broadcast" value based on offer type;
*) dhcpv4-server - fixed DHCP server functionality (introduced in v6.43rc);
*) dhcpv4-server - improved performance when "rate-limit" and/or "address-list" setting is present;
*) dhcpv6-client - added missing "Server identifier" parameter in release message;
*) dhcpv6-server - added initial dynamic simple queue support;
*) filesystem - improved software crash handling on devices with FLASH type memory;
*) interface - improved reliability on dynamic interface handling;
*) ipsec - added "responder" parameter for "mode-config" to allow multiple initiator configurations (CLI only);
*) ipsec - added "src-address-list" parameter for "mode-config" that generates dynamic "src-nat" rule (CLI only);
*) ipsec - added warning messages for incorrect peer configuration;
*) ipsec - do not allow removal of "proposal" and "mode-config" entries that are in use;
*) ipsec - improved reliability on generated policy addition when IKEv1 or IKEv2 used;
*) ipsec - install all DNS server addresses provided by "mode-config" server;
*) ipsec - separate phase1 proposal configuration from peer menu (CLI only);
*) kidcontrol - allow to edit discovered devices;
*) kidcontrol - fixed dynamically created firewall rules order;
*) led - fixed CCR1016-12S-1S+ LED behaviour after Netinstall (introduced in v6.41rc58);
*) led - improved w60g alignment trigger;
*) log - show interface name on OSPF "different MTU" info log messages;
*) lte - added extended LTE signal info for SIM7600 modules;
*) lte - added extended signal information for Quectel LTE EC25 and EP06 modem;
*) lte - added ICCID reading for info command R11e-LTE and R11e-LTE-US (CLI only);
*) lte - added roaming status reading for info command (CLI only);
*) lte - added support for Novatel USB730LN modem with new ID;
*) lte - allow to execute concurrent internal AT commands;
*) lte - allow to use multiple PLS modems at the same time;
*) lte - do not allow to send "at-chat" commands for configless modems;
*) lte - expose GPS channel for PLS modems;
*) lte - fixed SIM7600 registration info;
*) lte - improved r11e-LTE and r11e-LTE-US dialling process;
*) lte - improved r11e-LTE configuration exchange process;
*) lte - improved reading of SMS message after entering running state;
*) lte - renamed LTE scan tool field "scan-code" to "mcc-mnc" (CLI only);
*) lte - use "/32" address for the Passthrough feature when R11e-LTE module is used;
*) lte - use alphanumeric operator format in info command;
*) routerboard - allow to fill up to half of the RAM memory with files on devices with FLASH storage;
*) routerboard - fixed "protected-routerboot" feature (introduced in v6.42);
*) smb - fixed valid request handling when additional options are used;
*) ssh - disconnect all active connections when router gets rebooted or turned off;
*) switch - added support for port isolation by switch chip (CLI only);
*) tr069-client - fixed setting of "DeviceInfo.ProvisioningCode" parameter;
*) user - all passwords are now hashed and encrypted, plaintext passwords are kept for downgrade (will be removed in later upgrades);
*) w60g - added 4th 802.11ad channel (CLI only);
*) w60g - general stability and performance improvements;
*) w60g - improved maximal achievable distance;
*) w60g - removed distance lock for wAP 60G devices;
*) winbox - added bridge Fast Forward statistics counters;
*) winbox - fixed bridge port MAC learning parameter values;
*) winbox - show "Switch" menu on hAP ac^2 devices;
*) winbox - show HT MCS tab when "5ghz-n/ac" band is used;
*) wireless - do not disconnect clients when WDS master connects with MAC address "00:00:00:00:00:00";
*) wireless - fixed wireless interface lockup after period of inactivity;
*) wireless - improved Nv2 stability for 802.11n interfaces on RB953, hAP ac and wAP ac devices;

Download the new 'RouterOS 6.43rc21' version here: https://www.mikrotik.com/download