D21968.id82441.diff
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	diff --git a/share/man/man4/ng_source.4 b/share/man/man4/ng_source.4
	--- a/share/man/man4/ng_source.4
	+++ b/share/man/man4/ng_source.4
	@@ -32,7 +32,7 @@
	.\" Author: Dave Chapeskie
	.\" $FreeBSD$
	.\"
	-.Dd March 1, 2007
	+.Dd January 18, 2021
	.Dt NG_SOURCE 4
	.Os
	.Sh NAME
	@@ -91,7 +91,14 @@
	.Xr ng_ether 4
	node manually.
	.Pp
	-Once interface is configured, upon receipt of a
	+If the node is connected to a netgraph network, which does not
	+terminate in a real
	+.Xr ng_ether 4
	+interface, limit the packet injection rate explicitly with the
	+.Va NGM_SOURCE_SETPPS
	+control message.
	+.Pp
	+Upon receipt of a
	.Dv NGM_SOURCE_START
	control message the node starts sending
	the previously queued packets out the
	diff --git a/sys/netgraph/ng_source.c b/sys/netgraph/ng_source.c
	--- a/sys/netgraph/ng_source.c
	+++ b/sys/netgraph/ng_source.c
	@@ -683,8 +683,8 @@
	static int
	ng_source_start(sc_p sc, uint64_t packets)
	{
	- if (sc->output_ifp == NULL) {
	- printf("ng_source: start without iface configured\n");
	+ if (sc->output_ifp == NULL && sc->stats.maxPps == 0) {
	+ printf("ng_source: start without iface or pps configured\n");
	return (ENXIO);
	}