conf t int tunnel 1 tunnel mode gre ip ip add 10.100.1.1 255.255.255.252 tunnel source fastethernet 0/1 tunnel destination 1.1.100.6 keepalive 10 3 -> 10초마다 살아있는지 확인,3번 반복할때 1번도 답변이 오지 않으면 keepalive가 된 것이다. exit int tunnel 2 tunnel mode gre ip ip add 10.100.1.5 255.255.255.252 tunnel source fastethernet 0/1 tunnel destination 1.1.100.10 keepalive 10 3 exit router ospf 1 net 10.100.1.1 0.0.0.0 ar..
