thanks for replay, I disabled NTP client in System and removed broadcast address (blank) from setup , reboot, power off, on still can't ping anything and errors from system log
Wed Mar 12 02:42:12 2014 kern.info kernel: [ 24.820000] bitmain 1-1.1:1.0: USB Bitmain asic #0 now disconnected
Wed Mar 12 02:42:44 2014 daemon.info sysinit: ntpd: bad address '3.openwrt.pool.ntp.org'
Wed Mar 12 02:42:44 2014 daemon.info sysinit: ntpd: could not resolve peer 3.openwrt.pool.ntp.org, skipping
Wed Mar 12 02:43:14 2014 daemon.info sysinit: ntpd: bad address '2.openwrt.pool.ntp.org'
Wed Mar 12 02:43:14 2014 daemon.info sysinit: ntpd: could not resolve peer 2.openwrt.pool.ntp.org, skipping
Wed Mar 12 02:43:44 2014 daemon.info sysinit: ntpd: bad address '1.openwrt.pool.ntp.org'
Wed Mar 12 02:43:44 2014 daemon.info sysinit: ntpd: could not resolve peer 1.openwrt.pool.ntp.org, skipping
Wed Mar 12 02:44:14 2014 daemon.info sysinit: ntpd: bad address '0.openwrt.pool.ntp.org'
Wed Mar 12 02:44:14 2014 daemon.info sysinit: ntpd: could not resolve peer 0.openwrt.pool.ntp.org, skipping
Wed Mar 12 02:44:20 2014 daemon.info sysinit: Alarm clock
Wed Mar 12 02:44:20 2014 daemon.info sysinit: --bitmain-options 115200:32:8:40:350:4d81 -o
http://stratum.bitcoin.cz:3333 -O raspberrypirobots.worker4:qwerty --api-listen --api-network
Wed Mar 12 02:44:20 2014 daemon.info sysinit: - init complete -
Wed Mar 12 02:45:01 2014 cron.info crond[576]: crond: USER root pid 984 cmd /usr/bin/cgminer-monitor