외부로 PING 체크시 발생 - DUP! : icmp_seq 중복
# ping 192.168.181.151
From 192.168.72.250: icmp_seq=67 Redirect Host(New nexthop: 192.168.72.225)
64 bytes from 192.168.181.151: icmp_seq=67 ttl=115 time=3.15 ms
64 bytes from 192.168.181.151: icmp_seq=67 ttl=115 time=5.07 ms (DUP!)
64 bytes from 192.168.181.151: icmp_seq=67 ttl=116 time=5.34 ms (DUP!)
64 bytes from 192.168.181.151: icmp_seq=67 ttl=116 time=5.61 ms (DUP!)
From 192.168.72.250: icmp_seq=68 Redirect Host(New nexthop: 192.168.72.225)
64 bytes from 192.168.181.151: icmp_seq=68 ttl=115 time=3.24 ms
64 bytes from 192.168.181.151: icmp_seq=68 ttl=116 time=4.31 ms (DUP!)
64 bytes from 192.168.181.151: icmp_seq=68 ttl=116 time=4.31 ms (DUP!)
64 bytes from 192.168.181.151: icmp_seq=68 ttl=116 time=14.1 ms (DUP!)
From 192.168.72.250: icmp_seq=69 Redirect Host(New nexthop: 192.168.72.225)
64 bytes from 192.168.181.151: icmp_seq=69 ttl=115 time=3.30 ms
64 bytes from 192.168.181.151: icmp_seq=69 ttl=116 time=3.92 ms (DUP!)
64 bytes from 192.168.181.151: icmp_seq=69 ttl=115 time=6.84 ms (DUP!)
64 bytes from 192.168.181.151: icmp_seq=69 ttl=116 time=15.2 ms (DUP!) |
1) 동일 네트워크내에 IP 중복 (Or ARP 스푸핑)
2) LOOP 발생시
