08:14:18.186886 IP A > B: ESP(spi=0x507bc1fc,seq=0x1), length 132
08:14:18.188022 IP B > A: ESP(spi=0x2396c666,seq=0x1), length 132
08:14:18.188022 IP B > A: ICMP echo reply, id 7672, seq 1, length 64

08:14:25.528584 IP B > A: ESP(spi=0x2396c666,seq=0x2), length 132
08:14:25.528584 IP B > B: ICMP echo request, id 13691, seq 1, length 64
08:14:25.528865 IP A > B: ESP(spi=0x507bc1fc,seq=0x2), length 132