What's new in 6.23 (2014-Dec-04 14:46):

*) pptp - fixed problem where tunnel stopped transmitting packets under heavy load;
*) web proxy - caching in RAM for boards with 32MB or less RAM will not cache any content;
*) leds - removed 'led' command and added support for 'on', 'off' types under 'system leds';
*) files - allow to move files between different disks in winbox;
*) dhcpv4 server - fix adding address lists from radius;
*) dhcpv4 server - make radius classless static route tag as dhcp vendor specific;
*) smb - fixed HDD used/free space reporting
*) made powerpc metarouters work again (were broken in v6.22);
*) disks - fixed fat32 formatting where some bogus files with strange names were created
   (to delete existing files reformatting is needed);
*) disks - fixed problem where some of USB disks were not recognized;
*) fetch - allow checking certificate trust without crl checking;
*) userman - fix more web session problems when user uses
    customer and administrator interfaces at the same time;
*) snmp - fix external storage info reporting;
*) snmp - fix bulk walk problem introduced in v6.20;
*) fix tunnels - keep keepalive disabled for existing tunnels when upgrading;
*) fix tunnels - mtu for eoip tunnels was not allowed
   to be set less than 1280 since 6.20;
*) using routing-marks could lead to tunnel loop detection to turn off tunnels;