@FrancisL
Pour la trace si tu peux juste filtrer avec 'bootp' pour juste voir dhcp et afficher la colonne Time "Time since previous display packet" , ensuite "Export Packet dissection -> CSV"
Voici ma trace sur un laptop Win10 à partir au moment ou je branche le câble dans le laptop. il est en csv, la colonne Time donne l'interval de temps pour les retries.
"No.","Time","Data rate","Signal strength (dBm)","Source","Destination","Protocol","Length","Timestamp","Sequence number","Info"
"36","0.000000","","","0.0.0.0","255.255.255.255","DHCP","364","","","DHCP Request - Transaction ID 0xbba66272"
"66","1.490007","","","0.0.0.0","255.255.255.255","DHCP","364","","","DHCP Request - Transaction ID 0xbba66272"
"147","2.219846","","","0.0.0.0","255.255.255.255","DHCP","364","","","DHCP Request - Transaction ID 0xbba66272"
"269","2.656470","","","0.0.0.0","255.255.255.255","DHCP","364","","","DHCP Request - Transaction ID 0xbba66272"
"428","5.993419","","","0.0.0.0","255.255.255.255","DHCP","364","","","DHCP Request - Transaction ID 0x4c2b790f"
"450","1.938155","","","0.0.0.0","255.255.255.255","DHCP","364","","","DHCP Request - Transaction ID 0x4c2b790f"
"548","3.002523","","","0.0.0.0","255.255.255.255","DHCP","364","","","DHCP Request - Transaction ID 0x4c2b790f"
"767","16.316618","","","0.0.0.0","255.255.255.255","DHCP","344","","","DHCP Discover - Transaction ID 0xa9eab48a"
"768","0.009366","","","10.0.0.1","LAPTOP-8RLKDFJC.local","DHCP","342","","","DHCP Offer - Transaction ID 0xa9eab48a"
"769","0.001619","","","0.0.0.0","255.255.255.255","DHCP","370","","","DHCP Request - Transaction ID 0xa9eab48a"
"770","0.023166","","","10.0.0.1","LAPTOP-8RLKDFJC.local","DHCP","362","","","DHCP ACK - Transaction ID 0xa9eab48a"
Si tu veux voir la relation du dhcp et le stp, mets le filtre 'bootp || stp' tu verras le stp de helix va flagger un Topology Change flag autour de 30sec après que le câble soit branché, helix va mettre son port ethernet en forwarding mode pour être 100% fonctionnel.