unexplained conntrack entries

[gabriel smolar <jarod125@xxxxxxxxx>]

when i do cat /proc/net/ip_conntrack i get o lot of entries like:
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tcp 6 359867 ESTABLISHED src=192.168.1.1 dst=192.168.1.184 sport=59975 dport=80 [UNREPLIED]
src=192.168.1.184 dst=192.168.1.1 sport=80 dport=59975 use=1
tcp 6 359867 ESTABLISHED src=192.168.1.1 dst=192.168.1.185 sport=59974 dport=80 [UNREPLIED]
src=192.168.1.185 dst=192.168.1.1 sport=80 dport=59974 use=1
tcp 6 359867 ESTABLISHED src=192.168.1.1 dst=192.168.1.185 sport=59975 dport=80 [UNREPLIED]
src=192.168.1.185 dst=192.168.1.1 sport=80 dport=59975 use=1
tcp 6 359867 ESTABLISHED src=192.168.1.1 dst=192.168.1.186 sport=59974 dport=80 [UNREPLIED]
src=192.168.1.186 dst=192.168.1.1 sport=80 dport=59974 use=1
tcp 6 359867 ESTABLISHED src=192.168.1.1 dst=192.168.1.186 sport=59975 dport=80 [UNREPLIED]
src=192.168.1.186 dst=192.168.1.1 sport=80 dport=59975 use=1
tcp 6 359867 ESTABLISHED src=192.168.1.1 dst=192.168.1.187 sport=59974 dport=80 [UNREPLIED]
src=192.168.1.187 dst=192.168.1.1 sport=80 dport=59974 use=1
tcp 6 359867 ESTABLISHED src=192.168.1.1 dst=192.168.1.187 sport=59975 dport=80 [UNREPLIED]
src=192.168.1.187 dst=192.168.1.1 sport=80 dport=59975 use=1
tcp 6 359867 ESTABLISHED src=192.168.1.1 dst=192.168.1.188 sport=59974 dport=80 [UNREPLIED]
src=192.168.1.188 dst=192.168.1.1 sport=80 dport=59974 use=1
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The sport is in the 56000 range and the dst is in the 192.168.1.* range. 192.168.1.1 is a slack 8.1 router with only sshd running, the rest of the lan are win boxes.
i can't figure it out what's generating these requests...
They don't show up when i monitor the traffic with iptraf.