D40397.id122770.diff
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D40397.id122770.diff
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	diff --git a/sys/net/if_epair.c b/sys/net/if_epair.c
	--- a/sys/net/if_epair.c
	+++ b/sys/net/if_epair.c
	@@ -336,6 +336,15 @@
	return (0);
	M_ASSERTPKTHDR(m);

	+ /* We could just transmit this, but it makes testing easier if we're a
	+ * little bit more like real hardware.
	+ * Allow just that little bit extra for ethernet (and vlan) headers. */
	+ if (m->m_pkthdr.len > (ifp->if_mtu + sizeof(struct ether_vlan_header))) {
	+ m_freem(m);
	+ if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
	+ return (E2BIG);
	+ }
	+
	/*
	* We are not going to use the interface en/dequeue mechanism
	* on the TX side. We are called from ether_output_frame()