rb 600 with 6.11 ppc I lose the access with [ip] about after 1 or 2 days , I have access only with [mac address ] and observe in [log] "failed to open TCP connection :No buffer space available "
so that the bgp connections have no routes !!!
the dhcp server working normal and send ip addresses to the local machines

afterwards from reboot the router all come back in the normal situation until is redisplayed the problem !!!

I solve similar problem in this old routerboard wih netinstall (6.7!) and RouterOS 6.7 with 2.27 BIOS [firmware]

http://i.mt.lv/routerboard/files/mpc8343_2.27.fwf
http://download2.mikrotik.com/routeros/ ... ll-6.7.zip
http://download2.mikrotik.com/routeros/ ... pc-6.7.npk

Do not reimport .backup or you reimport the problems!
Use
/export compact file=backup
first and after install reimport line-by line on terminal (for catch errors) the backup.rsc

I solve similar problem in this old routerboard wih netinstall (6.7!) and RouterOS 6.7 with 2.27 BIOS [firmware]

rb600 is powerpc - there is link http://download2.mikrotik.com/routeros/ ... pc-6.7.npk

I have the same problem in ROS 6.11.(x86, CCR1016)

ROS 6.10....OK

Same Problem, ROS 6.11, FW 3.12, CCR 1016-12G. Two routers, Primary or Secondary, whichever seems to be doing the most BGP discussion, runs about 8 - 12 hours before halting any IP connectivity.

apr/08 06:46:01 route,bgp,info RemoteAddress=10.1.1.1
apr/08 06:46:07 route,bgp,info Failed to open TCP connection: No buffer space available
apr/08 06:46:07 route,bgp,info RemoteAddress=112.68.40.192
apr/08 06:46:21 route,bgp,info Failed to open TCP connection: No buffer space available
apr/08 06:46:21 route,bgp,info RemoteAddress=112.68.40.192
apr/08 06:46:59 route,bgp,info Failed to open TCP connection: No buffer space available
apr/08 06:46:59 route,bgp,info RemoteAddress=112.68.40.192

Have submitted supout. xpost http://forum.mikrotik.com/viewtopic.php ... 43#p420143