6.41rc50 changelog:

*) bridge - set "igmp-snooping=no" by default on new bridges;
*) crs3xx - added ingress/egress rate input limits;
*) dhcp-client - limited DHCP client "default-route-distance" minimal value to 1;
*) dhcp-server - added "option-set" argument (CLI only);
*) discovery - use "/interface list" instead of interface name under neighbor discovery settings;
*) health - fixed bogus voltage readings on CCR1009;
*) ike1 - fixed crash after downgrade if DH groups 19,20,21 were used for phase1;
*) ike1 - fixed crash on xauth if user does not exist;
*) ipv6 - fixed IPv6 addresses constructed from prefix and static address entry;
*) lte - added "/interface lte apn" menu (Passthrough requires reconfiguration);
*) lte - added Passthrough support;
*) lte - fixed user authentication for R11e-LTE when new firmware is used;
*) m11g - improved ethernet performance on high load;
*) netinstall - fixed missing "/flash/etc" on first bootup;
*) quickset - renamed router IP static DNS name to "router.lan";
*) radius - limited RADIUS timeout maximum value to 3 seconds;
*) sms - fixed minor problem for SMS delivery;
*) webfig - added favicon file;
*) webfig - fixed terminal graphic user interface under Safari browser;
*) winbox - do not show unnecessary tabs from "Switch" menu;
*) wireless - new driver with initial support for 160 and 80+80 MHz channel width;

Other changes since 6.40.4:

!) 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
!) routerboot - RouterBOOT version numbering system merged with RouterOS;
*) arm - minor improvements on CPU load distribution for RB1100 series devices;
*) arp - fixed invalid static ARP entries after reboot on interfaces without IP address;
*) bgp - added 32-bit private ASN support;
*) bridge - added comment support for VLANs (CLI only);
*) bridge - added initial support for hardware "igmp-snooping" on CRS1xx/2xx;
*) bridge - added support for "/interface list" as a bridge port;
*) bridge - assume "point-to-point=yes" for all Full Duplex Ethernet interfaces when STP is used (as per standard);
*) 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 ARP setting (introduced in v6.40rc36);
*) bridge - fixed connectivity issues when there are multiple VLAN interfaces on bridge;
*) bridge - fixed multicast forwarding (introduced in v6.40rc36);
*) bridge - implemented dynamic entries for active MST port overrides;
*) bridge - implemented software based "igmp-snooping";
*) bridge - implemented software based MSTP;
*) bridge - removed "frame-types" and "ingress-filtering" for bridge interfaces (introduced in v6.40rc36);
*) bridge - show "admin-mac" only if "auto-mac=no";
*) bridge - show bridge interface local addresses in the host table;
*) 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 SCEP "get" request URL encoding;
*) certificate - fixed import of certificates with empty SKID;
*) certificate - show "Expired" flag when initial CRL fetch fails;
*) chr - added KVM memory balloon support;
*) chr - added suspend support;
*) console - do not stop "/certificate sign" process if console times out in 1 minute;
*) console - removed "/setup";
*) crs317 - added initial support for HW offloaded MPLS forwarding;
*) crs326 - fixed packet processing speed on switch chip if individual port link speed differs;
*) crs3xx - switch VLAN configuration integrated within bridge VLAN configuration with hw-offload;
*) dhcp - fixed DHCP services failing after reboot when DHCP option was used;
*) dhcp - fixed unresponsive DHCP service caused by inability to read not set RAW options;
*) dhcp - require DHCP option name to be unique;
*) dhcpv4-client - add dynamic DHCP client for mobile clients which require it;
*) dhcpv4-client - allow to use DUID for client as identity string as the option 61;
*) e-mail - do not show errors when sending e-mail from script;
*) eoip - made L2MTU parameter read-only;
*) ethernet - removed "master-port" parameter;
*) export - fixed interface list export;
*) fetch - accept all HTTP 2xx status codes;
*) firewall - do not NAT address to 0.0.0.0 after reboot if to-address is used but not specified;
*) ike1 - fixed RSA authentication for Windows clients behind NAT;
*) ike1 - release mismatched PH2 peer IDs;
*) ike2 - check identities on "initial-contact";
*) ike2 - fixed initiator DDoS cookie processing;
*) ike2 - fixed responder DDoS cookie first notify type check;
*) ike2 - use peer configuration address when available on empty TSi;
*) interface - added "/interface reset-counters" command (CLI only);
*) interface - added default "/interface list" "dynamic" which contains dynamic interfaces;
*) 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 - added DH groups 19, 20 and 21 support for phase1 and phase2;
*) ipsec - allow to specify "remote-peer" address as DNS name;
*) ipsec - fixed incorrect esp proposal key size usage;
*) ipsec - fixed lost value for "remote-certificate" parameter after disable/enable;
*) ipsec - fixed policy enable/disable;
*) ipsec - improved reliability on certificate usage;
*) ipsec - renamed "firewall" argument to "notrack-chain" in peer configuration;
*) ipsec - skip invalid policies for phase2;
*) ipv6 - add dynamic "/ip dns" server address from RA when RA is permitted by configuration;
*) l2tp - improved reliability on packet processing in FastPath;
*) l2tp-server - fixed PPP services becoming unresponsive after changes on L2TP server with IPSec configuration;
*) lcd - fixed "flip-screen=yes" state after reboot;
*) log - added "bridge" topic;
*) log - fixed interface name in log messages;
*) log - optimized "poe-out" logging topic logs;
*) log - properly recognize MikroTik specific RADIUS attributes;
*) lte - added Passthrough support (CLI only);
*) lte - added Yota non-configurable modem support;
*) lte - added support for ZTE ME3630 E1C with additional "/port" for GPS usage;
*) lte - automatically add "/ip dhcp-client" configuration on interface;
*) lte - changed default values to "add-default-route=yes", "use-peer-dns=yes" and "default-route-distance=2";
*) lte - do not reset modem when it is not possible to access SMS storage;
*) lte - fixed PIN option after setting up the band;
*) lte - fixed error when trying to add APN profile without name;
*) lte - fixed modem initialization after reboot;
*) lte - fixed rare crash when initializing LTE modem after reset;
*) lte - integrated IP address acquisition without DHCP client for wAP LTE kit-US;
*) lte - limited minimal default route distance to 1;
*) mac-server - use "/interface list" instead of interface name under MAC server settings;
*) modem - added initial support for Alcatel IK40 and Olicard 500;
*) neighbor - show neighbors on actual bridge port instead of bridge itself
*) netinstall - fixed missing default configuration prompt on first startup after reset/netinstall;
*) ospf - fixed OSPF v2 and v3 neighbor election;
*) ppp - added support for Sierra MC7750, Verizon USB730L;
*) ppp - fixed situation when part of PPP configuration was reset to default values after reboot;
*) 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;
*) sms - include timestamps in SMS delivery reports;
*) sms - properly initialize SMS storage;
*) snmp - fixed "/system license" parameters for CHR;
*) snmp - fixed "ifHighSpeed" value of VLAN, VRRP and Bonding interfaces;
*) snmp - fixed bridge host requests on devices with multiple bridge interfaces;
*) snmp - show only available OIDs under "/system health print oid";
*) ssh - do not use DH group1 with strong-crypto enabled;
*) ssh - enforced 2048bit DH group on tile and x86 architectures;
*) tile - improved hardware encryption processes;
*) traceroute - improved "/tool traceroute" results processing;
*) upnp - add "src-address" parameter on NAT rule if it is specified on UPnP request;
*) upnp - deny UPnP request if port is already used by the router;
*) ups - fixed duplicate "failed" UPS logs;
*) winbox - added "notrack-chain" setting to IPSec peers;
*) winbox - added support for "_" symbol in terminal window;
*) winbox - allow shorten bytes to k,M,G in Hotspot user limits;
*) winbox - do not show duplicate "Switch" menus for CRS326;
*) 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 "/certificate sign" process;
*) winbox - fixed bridge port sorting order by interface name;
*) winbox - show warnings under "/system routerboard settings" menu;
*) wireless - added "allow-signal-out-off-range" option for Access List entries;
*) wireless - fixed rate selection process when "rate-set=configured" and NV2 protocol is used;
*) wireless - improved reliability on "rx-rate" selection process;
*) wireless - log "signal-strength" when successfully connected to AP;
*) wireless - pass interface MAC address in Sniffer TZSP frames;
*) wireless - updated "united kingdom" regulatory domain information;

Download the new 'RouterOS 6.41rc50' version here: https://www.mikrotik.com/download