05-25-2019 05:59 AM - edited 02-21-2020 09:10 AM
Hello,
I have come across the below document:
In task 2, It was mentioned that the icmp reply was blocked and the clish output was showing it.
Can you explain how to identify it?
The CLISH capture shows that the first echo-request went through FTD and the reply was blocked:
Options: -n 18:21:07.759939 IP 192.168.75.39 > 192.168.76.39: GREv0, length 104: IP 10.0.0.1 > 10.0.0.2: ICMP echo request, id 65, seq 0, length 80 18:21:07.759939 IP 192.168.76.39 > 192.168.75.39: GREv0, length 104: IP 10.0.0.2 > 10.0.0.1: ICMP echo reply, id 65, seq 0, length 80 18:21:09.759939 IP 192.168.75.39 > 192.168.76.39: GREv0, length 104: IP 10.0.0.1 > 10.0.0.2: ICMP echo request, id 65, seq 1, length 80 18:21:11.759939 IP 192.168.75.39 > 192.168.76.39: GREv0, length 104: IP 10.0.0.1 > 10.0.0.2: ICMP echo request, id 65, seq 2, length 80 18:21:13.759939 IP 192.168.75.39 > 192.168.76.39: GREv0, length 104: IP 10.0.0.1 > 10.0.0.2: ICMP echo request, id 65, seq 3, length 80 18:21:15.759939 IP 192.168.75.39 > 192.168.76.39: GREv0, length 104: IP 10.0.0.1 > 10.0.0.2: ICMP echo request, i
Solved! Go to Solution.
05-28-2019 10:53 PM
If the question is how to see the Snort verdict for blocking the packets, then it is shown in the output of firewall-engine-debug on the same page:
10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 New session 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 using prefilter rule 268434441 with tunnel zone 1 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 Starting with minimum 0, id 0 and SrcZone first with zones 1 -> -1, geo 0 -> 0, vlan 0, sgt tag: 65535, svc 0, payload 0, client 0, misc 0, user 9999997, icmpType 8, icmpCode 0 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 pending rule order 3, 'Block ICMP', AppId 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 using prefilter rule 268434441 with tunnel zone 1 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 Starting with minimum 0, id 0 and SrcZone first with zones 1 -> -1, geo 0 -> 0, vlan 0, sgt tag: 65535, svc 3501, payload 0, client 2000003501, misc 0, user 9999997, icmpType 0, icmpCode 0 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 match rule order 3, 'Block ICMP', action Block 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 deny actionn
05-28-2019 10:53 PM
If the question is how to see the Snort verdict for blocking the packets, then it is shown in the output of firewall-engine-debug on the same page:
10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 New session 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 using prefilter rule 268434441 with tunnel zone 1 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 Starting with minimum 0, id 0 and SrcZone first with zones 1 -> -1, geo 0 -> 0, vlan 0, sgt tag: 65535, svc 0, payload 0, client 0, misc 0, user 9999997, icmpType 8, icmpCode 0 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 pending rule order 3, 'Block ICMP', AppId 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 using prefilter rule 268434441 with tunnel zone 1 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 Starting with minimum 0, id 0 and SrcZone first with zones 1 -> -1, geo 0 -> 0, vlan 0, sgt tag: 65535, svc 3501, payload 0, client 2000003501, misc 0, user 9999997, icmpType 0, icmpCode 0 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 match rule order 3, 'Block ICMP', action Block 10.0.0.1-8 > 10.0.0.2-0 1 AS 1 I 0 deny actionn
10-30-2019 04:24 AM
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