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Dear community,

I have a host (jenkins-builder) running in the GCP.

If I execute many http requests to some external host, for instance, http://example.com - source host networking will be "blocked" for a certain time == 30 secodns.

I've captured traffic via tcpdump, and now I can see that there are NO ACK packets during time "blocked" time: http://app.ep4sh.cc/paste/MLxciufIus

I do see multiple [S] but lack of [ACK] - I've double-checked the behavior on the neighbor hosts - there is no such issue on them. So in my opinion it's a particular host issue.

Could somebody suggest how to find out the root cause? I'm running on Debian buster. Thank you in advance!

Dear community,

I have a host (jenkins-builder) running in the GCP.Google Cloud Platform.

If I execute many http HTTP requests to some external host, for instance, http://example.com - source host networking will be "blocked" for a certain time == 30 secodns.seconds.

I've captured traffic via tcpdump, and now I can see that there are NO no ACK packets during time the "blocked" time: http://app.ep4sh.cc/paste/MLxciufIus

I do see multiple [S] but lack of [ACK] - I've double-checked the behavior on the neighbor hosts - there is no such issue on them. So in my opinion it's a particular host issue.

Could somebody suggest how to find out the root cause? I'm running on Debian buster. Thank you in advance!