dnl so trim off the end of the line where differences appear.
AT_CHECK([sed 's/\(length 60:\).*/\1 .../' stdout], [0], [dnl
OFPT_PACKET_IN (xid=0x0): total_len=60 in_port=3 data_len=60 buffer=0x00000111
-priority0:tunnel0:in_port0003:tci(0) mac50:54:00:00:00:05->50:54:00:00:00:06 type0800 proto6 tos0 ip192.168.0.1->192.168.0.2 port10031->0
+priority0:tunnel0:in_port0003:tci(0) mac50:54:00:00:00:05->50:54:00:00:00:06 type0800 proto6 tos0 ttl64 ip192.168.0.1->192.168.0.2 port10031->0
50:54:00:00:00:05 > 50:54:00:00:00:06, ethertype IPv4 (0x0800), length 60: ...
])
AT_CLEANUP