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Question 240 - PCNSE discussion

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An engineer receives reports from users that applications are not working and that websites are only partially loading in an asymmetric environment. After investigating, the engineer observes the flow_tcp_non_syn_drop counter increasing in the show counters global output.

Which troubleshooting command should the engineer use to work around this issue?

A.
set deviceconfig setting tcp asymmetric-path drop
Answers
A.
set deviceconfig setting tcp asymmetric-path drop
B.
set deviceconfig setting session tcp-reject-non-syn no
Answers
B.
set deviceconfig setting session tcp-reject-non-syn no
C.
set session tcp-reject-non-syn yes
Answers
C.
set session tcp-reject-non-syn yes
D.
set deviceconfig setting tcp asymmetric-path bypass
Answers
D.
set deviceconfig setting tcp asymmetric-path bypass
Suggested answer: B

Explanation:

To work around this issue, one possible troubleshooting command is set deviceconfig setting session tcp-reject-non-syn no which disables TCP reject non-SYN temporarily (until reboot)4. This command allows non-SYN first packet through without dropping it.

The flow_tcp_non_syn_drop counter increases when the firewall receives packets with the ACK flag set, but not the SYN flag, which indicates asymmetric traffic flow. The tcp-reject-non-syn option enables or disables the firewall to drop non-SYN TCP packets. In this case, disabling the tcp-rejectnon- syn option using the "set deviceconfig setting session tcp-reject-non-syn no" command can help work around the issue. This allows the firewall to accept non-SYN packets and create a session for the existing flow.

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asked 23/09/2024
Mohamed Mohamed
48 questions
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