I was wondering if it is possible to build a network that allows two subnets to be linked by wireless routers with identical network SSIDs and security protocols in such a way that a DHCP Client can switch between the two without losing any packets.
I've heard that once upon a time there was an idea for IPv4 mobility, allowing cross-subnet roaming by relaying things through a host network, but supposedly it never caught on.
Is it possible for one router (access point), to detect when a client is disconnecting using DHCP Release, and then forward any further traffic for that client out to other access points to get relayed by whichever AP has the client connected to it?
Best Answer
Not with different subnets, no. You can use the same subnet, same VLAN, and same SSID on both APs and you'll be able to roam between them. If you try to use a new subnet, the client will need a new IP address or you'll risk duplicate IPs when they roam, plus you'd need some crazy NAT or VRF setup to talk from one side to another.