Needs more than 250 ip addresses

[dee-u]

A modem usually just provide approximately 250 IP address for its DHCP but I need more than what it can provide. What are my possible solutions to this?

I wanted to try using our TP-Link TL-R470T+ to act as a DHCP Server but it seems it also limited to its IP address range, or that I just cannot set it up correctly? Its start range is 192.168.0.2 and end ip is 192.168.0.255 (something like that). Could I let it use another end ip like 192.168.3.255?

Help would be most welcome. Thank you in advance!

[icecream-guy]

can you change to subnet mask, say from 255.255.255.0 to 255.255.254.0?  This would give you 512 IP's for example 192.168.0.0 255.255.254.0 would support 192.168.0.1 - 192.168.1.255

[deanwebb]

Just remember to document that so everyone knows it's a /23 and not a typical /24 network.

If the device supports setting up another VLAN, then you can have a second /24 network and keep things standard. Nothing says you have to do it that way, but it does keep things simpler.

Next question: what do you have that requires more than 250 addresses? There may be justification to keep the bulk of them with one kind of Internet access and the remainder with another kind of Internet access, for security's sake.