If enabled accel-pppd will not destroy interface immediately after corresponding session is terminated, instead interface will be brought down  and placed to cache for later use for new sessions.
     It should reduce kernel interface creation/deletion rate lack and increase responsibility of daemon

Low interface creation/deletion rate is kernel issue and should be fixed in 3.5.

This reverts commit 9ae4a015.

Revert "fdtrash: don't queue descriptors after context is closed (fix segfault when stopping accel-pppd)"

This reverts commit 2e568932.

ppp: if signle-session=replace down first session's interface before second comes up (should fix unexpected ospf routes deletion)

 to ignore them, instead of refusing connection.
Signed-off-by: NDenys Fedoryshchenko <denys@visp.net.lb>

pppd_compat: use EV_PPP_PRE_FINISHED event to start ip-down script (fixes unexpected radattr file removal)

* fixed ip-down segfault

This reverts commit d77729c3.

* implemented logwtmp module
* implemented connlimit module
* implemented advanced shaper
* implemented MS-Primary-DNS-Server/MS-Secondary-DNS-Server attributes
* fix per-interface PADI limiting (pppoe)
* fix module load order
* fix "show sessions match" (cli)
* other bugfixes and improvements