ちょっと見ていない間にRouterOSのCurrentブランチがアップデートされていました。
主な修正内容は以下のとおり。
What's new in 6.34.2 (2016-Feb-18 06:31): *) dude - updated to the latest Release Candidate revision (v6.35rc11); *) dude - (changes discussed here: https://forum.mikrotik.com/viewtopic.php?f=8&t=104395); *) chr - fixed high rate limitation; *) dhcpv6 client - fix pd hint with empty address; *) ipsec - fix console peer aes enc algorithm display; *) l2tp - ipsec peer & policy sometimes was not removed after l2tp interface disable; *) log - try not to loose disk messages and warn if lost any; *) lte - fix allowed bands for RBSXTLTE3-7; *) pptp - fixed kernel crash when receiving fragmented packet with fragmented header; *) proxy - store error.html on flash if it is available; *) ssh - fixed connection stalling; *) ssh - make export verbose work; *) switch - make "sa-learning=yes" by default when adding Ingress VLAN Translation rules; *) tile - fixed possible kernel failure with disabled watchdog timer caused by DDoS attack; *) ups - fix waiting for AC power restore in hibernate mode; *) winbox - added factory-firmware field to system/routerboard; *) winbox - fixed email address saving; *) winbox - fixed multi value field display (i.e. web proxy ports); *) winbox - fixed incomplete ARP entries are not refreshed; *) www - fixed www crash. What's new in 6.34.1 (2016-Feb-02 14:08): *) interface - fixed stats that were 8x smaller; *) traffic-monitor - fixed stats that were 8x smaller; *) smips - properly detect smips boards for winbox & webfig.
dude周りの機能追加および、ipsec&L2TP周りの修正、pptpのkernelクラッシュの可能性の修正、winboxの表示周りの修正となります。
Tile向けではDDoS攻撃を受けた時に、watchdog タイマー周りでkernel failureになるようですので、適用も検討したほうが良いと思われます。