I have a subnet on 172.30/16 and I want to route to the 172.30.200/24 network, will the pc's on the /16 network look locally for the /24 network or will they look at there default gateway for that network ?
in what networks cant I use this method, is it basically any previous network numbers can not be used i.e 192.168/16 and if i tried to reach 192.168.1/24 would it look locally for this because it woul look at the first 2 subnets and think that the rest belongs to it ?
As stated above if you have your devices in a /16 network and route a /24 in the same range the devices with the /16 mask will do arps to find it rather than use the default gateway. The actually ip address don't matter only that the subnet masks are set correctly.
The reason that this works on many cisco routers is that cisco runs proxy arp by default. When a client machine issues a arp the router will respond to that arp with its mac address. It will then route the packet to the correct desination.
Just because this works this is not a good thing to do. proxy arp is one of those options that is many times turned off for security reasons
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