Hi Guys
I have a backbone ISP using business class connection with cable gateway modem which I get 5 DHCP IP addresses and 10 static IP addresses. So how would I give them 5 dhcp ip addresses and 10 static IP addresses into rb750 and pass off DHCP ip address to my customers on the rb750?
You can’t. You could bridge interfaces together and configure DHCP clients on the physical interfaces (which is an ugly hack to begin with), but the RB750 only has 5 interfaces total.
Or maybe someone has an even uglier hack.
ok about static DHCP inside of rb750?
I don’t understand the question.
ok can I take block of static IP’s and put as dhcp IP’s inside of rb750?
Very likely not. Since you’re not receiving routed IPs you’d have to use proxy ARP, which you can only do if you own the entire network on the WAN side of the router. Ask your ISP. The answer is likely no as you’re likely violating the terms of service. Business class cable connections usually exclude resale.
so your telling me that rb750 is junk then if it cant do a static dhcp server. By the way my business class cable connection is from TWBC and I got green light to resell it from my account rep.
No, that is not at all what I said. What I said is that you cannot hand out IP addresses via DHCP on the LAN side of a router that you yourself receive on the WAN side of a router either statically or via DHCP unless you own ALL the IP space that your router connects to on the WAN side. That isn’t a limitation of the RB750 or RouterOS, that is simply how TCP/IP works. If you need customers to have unique public IPs look into 1:1 NAT. Ideally, if you have a resale contract with TWBC, you would ask them to route you some IP space via your WAN IP, which is how resale IP space is usually distributed. Those IPs wouldn’t be on the WAN subnet your router connects to, and you could do as you please with them on the LAN side.
Unless I completely misunderstood your original request and you just want to know how to assign static IPs to the WAN interface (look at the IP address wiki manual page), how to get 5 DHCP leases on a WAN interface (you can’t), and how to do completely different static DHCP leases on a different subnet on the LAN side (look at the lease section of the DHCP server wiki manual page).