crie um script e coloque no crontab 1/60 minutos.

vi /bin/up_net.sh

conteúdo script.

!/bin/sh

/sbin/ping -c 5 8.8.8.8
chmod 777 /tmp/FailCount
cat /var/log/system.log | grep -a “date +%d date +%R” | grep -c “allocate llinfo for” > /tmp/FailCount
data=date +%R
FailCount=cat /tmp/FailCount
echo $FailCount
if [ “$FailCount” == “0” ]; then
echo “Error detected in logs. Attempting Repair. $data” >> /tmp/FailCount.txt
ifconfig re0 down
ifconfig re0 up
ifconfig re1 down
ifconfig re1 up
else
echo “Log file doesn’t show arp errors. $data” >> /tmp/FailCount.txt
fi

crontab

1/60 * * * * /bin/up_net.sh

so deixar rodar e o problema esta resolvido princialmente.