X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Finterface_output.c;h=ba69d36b6c46ee61a3cf9c162372e70fbae0ecec;hb=9d7570ccde4ded1c5feea097b10272870bfc81da;hp=34f0a97713107a7111f7b152efeb05cdc833eea6;hpb=7baeb71f92826ee6ef02ab2c3d16484bb64d9301;p=vpp.git

diff --git a/src/vnet/interface_output.c b/src/vnet/interface_output.c
index 34f0a977131..ba69d36b6c4 100644
--- a/src/vnet/interface_output.c
+++ b/src/vnet/interface_output.c
@@ -181,7 +181,10 @@ calc_checksums (vlib_main_t * vm, vlib_buffer_t * b)
       if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM)
 	ip4->checksum = ip4_header_checksum (ip4);
       if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM)
-	th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
+	{
+	  th->checksum = 0;
+	  th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
+	}
       if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)
 	uh->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4);
     }