I am trying to help someone share a router between 2 distinct businesses. They have an linksys E2500 and have 2 businesses (their own and the business next door) both connection, whether it be wired or wireless, to the same router.
They weren't aware that meant the guys next door had access to their network/computers and now are asking if there is a way to segregate the 2. So share the Internet, but restrict each group to only have access to their own computers.
Now I knew the current setup was flawed, but would need advice on what should be done at this point to secure each group. Can a grouping be created for each and be secured?
Thank you.