D52379.diff
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	diff --git a/tests/atf_python/sys/net/vnet.py b/tests/atf_python/sys/net/vnet.py
	--- a/tests/atf_python/sys/net/vnet.py
	+++ b/tests/atf_python/sys/net/vnet.py
	@@ -103,6 +103,7 @@
	if1 = cls(alias_name, name)
	ret = [if1]
	if name.startswith("epair"):
	+ run_cmd("/sbin/ifconfig {} -txcsum -txcsum6".format(name))
	if2 = cls(alias_name, name[:-1] + "b")
	if1.epairb = if2
	ret.append(if2);
	diff --git a/tests/sys/common/vnet.subr b/tests/sys/common/vnet.subr
	--- a/tests/sys/common/vnet.subr
	+++ b/tests/sys/common/vnet.subr
	@@ -42,6 +42,11 @@
	vnet_mkepair()
	{
	ifname=$(ifconfig epair create)
	+ # When transmit checksum offloading is enabled, if_epair does not
	+ # compute checksums, it just marks packets that this computation still
	+ # needs to be done. However, some test cases verify the checksum.
	+ # Therefore disable this for IPv4 and IPv6.
	+ ifconfig ${ifname} -txcsum -txcsum6
	list_interface $ifname
	list_interface ${ifname%a}b
	echo ${ifname%a}