#summary Changelog and notes about CORE releases.

= 4.1 =
CORE 4.1 was released on 1/5/11.

The high-level changes since version 4.0 are:
 * new icons for toolbars and nodes
 * node services introduced, node models deprecated
 * customizable node types
 * traffic flow editor with MGEN support
 * user configs moved from /etc/core/`*` to ~/.core/
 * allocate addresses from custom IPv4/IPv6 prefixes
 * distributed emulation using GRE tunnels
 * FreeBSD 8.1 now uses cored.py
 * EMANE 0.6.4 support
 * numerous bugfixes

Known issues with 4.1:
 * kernel hanging under Ubuntu 10.10 [http://code.google.com/p/coreemu/issues/detail?id=38 issue 38]
 * Tunnel node not implemented under FreeBSD [http://code.google.com/p/coreemu/issues/detail?id=37 issue 37]
 * OSPF hellos become synchronized after running emulation for about one hour [http://code.google.com/p/coreemu/issues/detail?id=39 issue 39]
 * CPU widget has been removed
 * Mobility tool has been removed
 * FreeBSD 8.1-RELEASE kernel warns "freed uma keg was not empty" and eventually crashes [http://code.google.com/p/coreemu/issues/detail?id=40 issue 40]
 * "no common network" error when reconnecting to a session having point-to-point links and trying to modify/delete these links
 * imn files made from older CORE versions not working in 4.1; see the [http://coreemu.blogspot.com/2010/11/node-types-and-services.html announcement about new CORE services]
 * `sample1.imn` hanging under FreeBSD 8.1 with Quagga MDR 1.0. On node7, the `vtysh -b` command is blocking waiting for ospf6d, which seems to be waiting for a lock



= 4.0 =
CORE 4.0 was released on 8/17/10.

Here are some of the high-level changes since version 3.5:
 * Python framework with Linux network namespace (netns) support (Linux netns is now the primary supported platform)
 * ability to close the GUI and later reconnect to a running session (netns only)
 * EMANE integration (netns only)
 * new topology generators, host file generator
 * user-editable Observer Widgets
 * use of /etc/core instead of /usr/local/etc/core
 * various bugfixes

Link to the [http://pf.itd.nrl.navy.mil/pipermail/core-users/2010-August/000209.html 4.0 release announcement].

= 3.5 =
CORE 3.5 was released on 9/15/09.

Link to the [http://pf.itd.nrl.navy.mil/pipermail/core-users/2009-September/000062.html 3.5 release announcement].

= 3.4 =
CORE 3.4 was released on 6/23/09.

Link to the [http://pf.itd.nrl.navy.mil/pipermail/core-users/2009-June/000019.html 3.4 release announcement].

= 3.3 =
CORE 3.3 was released on 3/11/09.

Link to the [http://pf.itd.nrl.navy.mil/pipermail/core-users/2009-March/000010.html 3.3 release announcement].