What's new in 6.19 (2014-Aug-26 14:05):

*) wireless - improvements for nv2 and 802.11ac 
*) sstp - make sstp work on i386 as well;
*) ippool - improve performance when acquiring address without preference;
*) partitions - copying partitions did not work on some boards;
*) bridge - added "Auto Isolate" stp enhancement (802.1q-2011, 13.25.6)
*) ipsec - when peer config is changed kill only relevant SAs;
*) vpls - do not abort BGP connection when receiving invalid 12 byte
nexthop encoding;
*) dns-update - fix zone update;
*) dhcpv4 server - support multiple radius address lists;
*) console - added unary operator 'any' that evaluates to true if argument
is not null or nothing value;
*) CCR - improved performance;
*) firewall - packet defragmenting will only happen with connection tracking enabled;
*) firewall - optimized option matching order with-in a rule;
*) firewall - rules that require CONNTRACK to work will now have Invalid flag
when CONNTRACK is disabled;
*) firewall - rules that require use-ip-firewall to work will now have invalid flag
when use-ip-firewall is disabled;
*) firewall - rules that have interface with "Slave" flag specified as in-/out-interface
will now have Invalid flag;
*) firewall - rules that have interface without "Slave" flag specified as in-/out-bridge-port
will now have Invalid flag;
*) firewall - rules with Invalid flags will now be auto-commented to explain why;
*) l2tp - force l2tp to not use MPPE encryption if IPsec is used;
*) sstp - force sstp to not use MPPE encryption (it already has TLS one);
*) sstp - make it work for x86 systems 
*) winbox - added dual PSU stats in health menu 
*) ipv6 - Gre6 can now correctly fragment large packets 
*) simple queue performance optimisation/improvement for multi-core RouterOS devices (especially CCR)