Hi, Please take a look to this network layout: (Enterprise LAN) | || | |+Squid to internet and Users Auth | +LAN PCs | router | router | (Enterprise Substation LAN) || |+Squid +LAN PCs The Enterprise's Squid has all the users who has access to internet including all their substations' users as well. Is there a way that Substation's users pass through their Squid and to be authenticated by Enterprise's Squid? Thanks...