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Making routing decisions on a "per device" basis is the very essence of what routers do. Strictly speaking, it's done by IP addresses (or ranges of IP addresses.) However - there's the rub, IP addressing can easily be changed in many devices which makes it not entirely robust and reliable if required as a security mechanism. Whether SOHO gear offers such granularity of control is another matter, though one would hope higher end "pro-sumer" equipment offered such things.
In better equipment one can indulge in additional "layers" of complexity that can be wrapped into the rules such as VLAN's, which (physical) interfaces are involved, ACL's, NAT translation, firewalls, etc. etc. It can all get very complicated very quickly! |
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