[dhcp_relay] change ptfutils to tcpdump for better result #21706
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Signed-off-by: Xichen Lin <[email protected]>
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selldinesh
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Dec 18, 2025
…21706) On some testbeds, we have observed around 25% packet loss with dhcp relay stress test. We have confirmed that packets were sent out of dut intf fine, but packets were dropped at 1. before reaching server and 2. after reaching server and during ptf packet capture. For large packet amounts ptfutils tends to drop packets and the amount goes up as packet amount increase. By switching using tcpdump directly, 25% packet loss can be reduced to around 10%. What is the motivation for this PR? This pr reduces packet loss during ptf packet capture and makes result better How did you do it? Replace ptfutils packet capture with tcpdump capture How did you verify/test it? Run test Signed-off-by: Xichen Lin <[email protected]> Signed-off-by: selldinesh <[email protected]>
gshemesh2
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Dec 21, 2025
…21706) On some testbeds, we have observed around 25% packet loss with dhcp relay stress test. We have confirmed that packets were sent out of dut intf fine, but packets were dropped at 1. before reaching server and 2. after reaching server and during ptf packet capture. For large packet amounts ptfutils tends to drop packets and the amount goes up as packet amount increase. By switching using tcpdump directly, 25% packet loss can be reduced to around 10%. What is the motivation for this PR? This pr reduces packet loss during ptf packet capture and makes result better How did you do it? Replace ptfutils packet capture with tcpdump capture How did you verify/test it? Run test Signed-off-by: Xichen Lin <[email protected]> Signed-off-by: Guy Shemesh <[email protected]>
vrajeshe
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Jan 4, 2026
…21706) On some testbeds, we have observed around 25% packet loss with dhcp relay stress test. We have confirmed that packets were sent out of dut intf fine, but packets were dropped at 1. before reaching server and 2. after reaching server and during ptf packet capture. For large packet amounts ptfutils tends to drop packets and the amount goes up as packet amount increase. By switching using tcpdump directly, 25% packet loss can be reduced to around 10%. What is the motivation for this PR? This pr reduces packet loss during ptf packet capture and makes result better How did you do it? Replace ptfutils packet capture with tcpdump capture How did you verify/test it? Run test Signed-off-by: Xichen Lin <[email protected]> Signed-off-by: Venkata Gouri Rajesh Etla <[email protected]>
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Description of PR
On some testbeds, we have observed around 25% packet loss with dhcp relay stress test. We have confirmed that packets were sent out of dut intf fine, but packets were dropped at 1. before reaching server and 2. after reaching server and during ptf packet capture. For large packet amounts ptfutils tends to drop packets and the amount goes up as packet amount increase. By switching using tcpdump directly, 25% packet loss can be reduced to around 10%.
Summary:
Fixes # (issue)
Type of change
Back port request
Approach
What is the motivation for this PR?
This pr reduces packet loss during ptf packet capture and makes result better
How did you do it?
Replace ptfutils packet capture with tcpdump capture
How did you verify/test it?
Run test
Any platform specific information?
Supported testbed topology if it's a new test case?
Documentation