@startuml
package server1 {
	[fastscp]
	[ssh]
}
package server2 {
	[sshd]
	[fastend]
}

	[fastscp] -right-> [ssh] : control
	[fastscp] <-right- [ssh] : status
	[ssh] -right-> [sshd] : control
	[ssh] <-right- [sshd] : status
	[sshd] -right-> [fastend] : control
	[sshd] <-right- [fastend] : status
	[fastscp] -> [fastend] : data out
	[fastscp] <- [fastend] : data in

@enduml