Limits and timings

Fixed values in the code, and the variables that change the others. Values in Variable can be set per program (Environment variables); the others need a rebuild.

Timings

What	Value	Where	Variable
Heartbeat interval on every link	10 s	C S A	VNET_HEARTBEAT_SEC
Silence before a link is closed	30 s	C S A	VNET_DEAD_SEC
Time for a new connection to identify itself	10 s	C S
Validity of a join token	60 s	C S
Agent: delay between join attempts	2 s	A
Agent: timeout of one join step (connect, or one reply)	10 s	A
Agent: tries on its assigned switch before asking the conductor again	3	A
Switch: delay between attempts to reach the conductor or a peer	2 s	S
Switch: timeout of one connection attempt	5 s	S
Switch: how long a packet waits for its route	5 s	S
Switch: interval of the statistics line	60 s	S	VNET_STATS_SEC
Conductor: interval of the state dump	60 s	C	VNET_DUMP_SEC
systemd: delay before a restart	2 s	units	RestartSec

Sizes

What	Value	Where	Variable
Agent name	1 to 10 characters	all
Switch name	1 to 32 characters	all
Largest frame payload	65994 bytes	all
Write buffer of one link	2 MiB	all
Packets read from one connection before serving the next	64	all
Connections accepted per loop turn	64	C S
Listen backlog	1024	C S
Packets held per destination waiting for a route	16	S
Piece of a pushed config	60000 bytes	C
Largest switch config a switch accepts	16 MiB	S
Packets per second per machine	20000	S	VNET_AGENT_PPS
Bandwidth per machine	200 Mbit/s	S	VNET_AGENT_MBPS
Open files	65536	units	LimitNOFILE

Addresses and ports

What	Value	Variable
Conductor port	5000	CONDUCTOR_PORT
First switch port (vnet-roster)	6000	--switch-port
Overlay prefix	10.0.0.0/8	VNET_OVERLAY_CIDR
Agent TUN	vnet-<name>
Switch internet TUN	vnet-out, 192.0.2.1/32
State dump	/var/vnet-dump.bin	VNET_DUMP_PATH
Agent route file	/run/vnet/agent-<name>.route	VNET_STATE_DIR