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-rw-r--r--test/template_ipsec.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/template_ipsec.py b/test/template_ipsec.py
index c3fc8bd434f..a4f998ee84e 100644
--- a/test/template_ipsec.py
+++ b/test/template_ipsec.py
@@ -379,7 +379,7 @@ class IpsecTra4(object):
# a malformed 'runt' packet
# created by a mis-constructed SA
- if (ESP == self.encryption_type):
+ if (ESP == self.encryption_type and p.crypt_algo != "NULL"):
bogus_sa = SecurityAssociation(self.encryption_type,
p.vpp_tra_spi)
pkt = (Ether(src=self.tra_if.remote_mac,