Packet sniffer tool

Good evening

I want to capture traffic between two IP addresses. However my following config captures traffic with either IP in the header (so logical or instead of and)

[dzhao@DaviFire2] > /tool sniffer export
# aug/13/2015 21:39:59 by RouterOS 6.15
# software id = DCX8-484B
#
/tool sniffer
set file-limit=100000KiB file-name=pcap filter-interface=03-RoutingNetwork filter-ip-address=1.1.1.1/32,2.2.2.2/32 memory-limit=100000KiB

Did I do anything wrong here?
Thanks,
Difan