6.41rc21 changelog:

*) arp - properly update dynamic ARP entries after interface related changes;
*) bridge - added initial support for hardware "igmp-snooping" on CRS1xx/2xx;
*) bridge - implemented software based "igmp-snooping";
*) bridge - implemented software based MSTP;
*) bridge - removed "master-port" parameter;
*) ike1 - remove PH1 and PH2 when "mode-config" exchange fails;
*) interface - added "/interface reset-counters" command (CLI only);
*) ipsec - added DH groups 19, 20 and 21 support for phase1 and phase2 (CLI only);
*) lcd - fixed "flip-screen=yes" state after reboot;
*) lte - added "/interface lte apn" menu (Passthrough requires reconfiguration) (CLI only);
*) lte - added Yota non-configurable modem support;
*) lte - fixed mode initialization after reboot;
*) sniffer - fixed VLAN tag reporting for TX packets (introduced 6.41rc14);
*) tile - improved reliability on MPLS package processing;
*) wireless - pass interface MAC address in Sniffer TZSP frames;
*) wireless - updated United Kingdom regulatory domain information;

Other changes since 6.40.3:

!) bridge - implemented software based vlan-aware bridges;
https://wiki.mikrotik.com/wiki/Manual:Interface/Bridge#Bridge_VLAN_Filtering
!) switch - "master-port" conversion into a bridge with hardware offload "hw" option;
https://wiki.mikrotik.com/wiki/Manual:Switch_Chip_Features#Bridge_Hardware_Offloading
!) bridge - general development of hw-offload bridge implementation (introduced in v6.40rc36);
*) arp - fixed invalid static ARP entries after reboot on interfaces without IP address;
*) bridge - added initial support for hardware "igmp-snooping" on CRS1xx/2xx;
*) bridge - automatically turn off "fast-forward" feature if both bridge ports have "H" flag;
*) bridge - changed "Host" and "MDB" table column order;
*) bridge - fixed "fast-forward" counters;
*) bridge - fixed "R" state for bridge interfaces on x86 and CHR installations (introduced in v6.41rc12);
*) bridge - fixed ARP setting (introduced in v6.40rc36);
*) bridge - fixed multicast forwarding (introduced in v6.40rc36);
*) bridge - implemented dynamic entries for active MST port overrides;
*) bridge - implemented software based "igmp-snooping";
*) bridge - removed "frame-types" and "ingress-filtering" for bridge interfaces (introduced in v6.40rc36);
*) bridge - show "admin-mac" only if "auto-mac=no";
*) btest - improved reliability on Bandwidth Test when device`s RAM is almost full;
*) capsman - added "vlan-mode=no-tag" option;
*) capsman - return complete CA chain when issuing new certificate;
*) certificate - fixed import of certificates with empty SKID;
*) certificate - fixed SCEP "get" request URL encoding;
*) certificate - show "Expired" flag when initial CRL fetch fails;
*) CRS3xx - switch VLAN configuration integrated within bridge VLAN configuration with hw-offload;
*) dhcp - require DHCP option name to be unique;
*) dhcpv6 client - added IAID check in reply;
*) dhcpv6-client - fixed IA check on solicit when "raoud-commit" is enabled;
*) dhcpv6-client - ignore unknown IA;
*) e-mail - do not show errors when sending e-mail from script;
*) export - fixed interface list export;
*) hotspot - fixed missing "/ip hotspost server profile" if invalid "dns-name" was specified;
*) hotspot - improved user statistics collection process;
*) ike1 - release mismatched PH2 peer IDs;
*) ike2 - check identities on "initial-contact";
*) ike2 - use peer configuration address when available on empty TSi;
*) interface - added option to join and exclude "/interface list" from one and another;
*) interface - fixed corrupted "/interface list" configuration after upgrade;
*) ippool6 - try to assign desired prefix for client if prefix is not being already used;
*) ipsec - allow to specify "remote-peer" address as DNS name;
*) ipsec - kill PH1 on "mode-config" address failure;
*) ipsec - renamed "firewall" argument to "notrack-chain" in peer configuration;
*) ipv6 - add dynamic "/ip dns" server address from RA when RA is permitted by configuration;
*) ipv6 - fixed IPv6 address request from pool (introduced in 6.41rc1);
*) l2tp-server - fixed PPP services becoming unresponsive after changes on L2TP server with IPSec configuration;
*) lcd - fixed unresponsive LCD (introduced in v6.41rc15);
*) log - optimized "poe-out" logging topic logs;
*) lte - added Passthrough support (CLI only);
*) lte - integrated IP address acquisition without DHCP client for wAP LTE kit-US;
*) lte - properly recognize USB devices under "/system resource usb" (introduced in 6.41rc12);
*) modem - added initial support for Alcatel IK40 and Olicard 500;
*) ospf - fixed OSPF v2 and v3 neighbor election;
*) ppp - added support for Sierra MC7750, Verizon USB730L;
*) pppoe - fixed invalid PPPoE server or client after reboot or "interface" edit (introduced in v6.41rc9);
*) pppoe-server - fixed situation when PPPoE servers become invalid on reboot;
*) sfp - fixed SFP interface power monitor when bad SFP DDMI information is received;
*) sftp - added functionality which imports ".auto.rsc" file or reboots router on ".auto.npk" upload;
*) snmp - fixed bridge host requests on devices with multiple bridge interfaces;
*) ups - fixed duplicate "failed" UPS logs;
*) winbox - added "notrack-chain" setting to IPSec peers;
*) winbox - do not show duplicate "Template" parameters for filter in IPSec policy list;
*) winbox - do not show duplicate filter parameters "Published" in ARP list;
*) winbox - fixed bridge port sorting order by interface name;
*) winbox - show warnings under "/system routerboard settings" menu;

Download the new 'RouterOS 6.41rc21' version here: https://www.mikrotik.com/download