TCP server side issues - sometimes lacking any reply to SYN

[hannesm]

Hello,

when testing connectivity to https://mirage.io using a simple shell script:

$ export att=0
$ while test $ret = 0 ; do curl -m 10 https://mirage.io > /dev/null ; foo=$? ; echo $foo ; export ret=$foo ; done

I receive some connection establishment troubles. At the moment after 30-40 requests. They're all sequential. Attached is a pcap, where you can see the last connection failed. The syn has been retransmitted 3 times, but there's no reply from the server.

FWIW, I'm not sure which mirage-tcpip version is deployed on miage.io.
mirage.io.pcap.zip