in src/filtration/sessions_hash.h [73:87]
inline bool operator()(const Session& a, const Session& b) const
{
if((a.port[0] == b.port[0]) &&
(a.port[1] == b.port[1]) &&
(a.ip.v4.addr[0] == b.ip.v4.addr[0]) &&
(a.ip.v4.addr[1] == b.ip.v4.addr[1]))
return true;
if((a.port[1] == b.port[0]) &&
(a.port[0] == b.port[1]) &&
(a.ip.v4.addr[1] == b.ip.v4.addr[0]) &&
(a.ip.v4.addr[0] == b.ip.v4.addr[1]))
return true;
return false;
}