22 Ping ping Ping echorequest type 8 ICMP

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簡易判斷法(2/2) �Ping成功 我們就可以確定連線是成功 的 �但如果不能 ping 的話� 未必是連不上 ◦ Ping >echo-request( type 8 )的ICMP封包

簡易判斷法(2/2) �Ping成功 我們就可以確定連線是成功 的 �但如果不能 ping 的話� 未必是連不上 ◦ Ping >echo-request( type 8 )的ICMP封包 ◦ Pong>echo-reply( type 0 )的ICMP封包 �失敗 >防火牆隨便將request和reply攔 下 �設定為不回應任何echo-request �Linux �echo "1" > /proc/sys/net/ipv 4/icmp_echo_ignore_all 10

Thanks For You Attention 11

Thanks For You Attention 11

ICMP TracerouteTRACERT n ICMPMicrosoftICMP ICMP EchoRequest type 8ICMP TracerouteTRACERT n ICMPMicrosoftICMP ICMP EchoRequest type 8
Internet Control Message Protocol ICMP ICMP ICMP hasInternet Control Message Protocol ICMP ICMP ICMP has
ICMP ICMP Internet Control Message Protocol Each ICMPICMP ICMP Internet Control Message Protocol Each ICMP
PING accessible ping hostname ping c 10 hostnamePING accessible ping hostname ping c 10 hostname
PING accessible ping hostname ping c 10 hostnamePING accessible ping hostname ping c 10 hostname
PING accessible ping hostname ping s hostname alivePING accessible ping hostname ping s hostname alive
Network Monitoring and Management ICMP and SNMP ICMPNetwork Monitoring and Management ICMP and SNMP ICMP
ICMP UDP 1 ICMP Internet Control Message ProtocolICMP UDP 1 ICMP Internet Control Message Protocol
ICMP ICMP Sequence Number 2 Bytes Sequence NumberICMP ICMP Sequence Number 2 Bytes Sequence Number
ICMP LOGO v ICMP v v v vICMP LOGO v ICMP v v v v