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josu
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3 public IP in cable modem

Thu Nov 10, 2016 4:21 pm

Hello all,

I had an old cable modem with 4 ethernet interfaces. I could connect 3 devices there and each device toke (dhcp) 1 public IP.

Now the ISP change the modem and it just have one ethernet port. This port is connected to a Mikrotik router which take the public IP in the WAN port.

How could I get more IPs in the Mikrotik and use to NAT different local devices?

Thanks for your help.

Kind regards.
 
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rcourtney
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Re: 3 public IP in cable modem

Thu Nov 10, 2016 6:00 pm

I have never tried that. You should be able to look at the netmask assigned to your router and figure out your remaining IPs
the cable modem will support. Assign fixed IP on the devices. Do not NAT those devices.
You may also need to add route entries to the ports those devices are attached to.
 
josu
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Posts: 152
Joined: Wed May 27, 2015 6:20 pm

Re: 3 public IP in cable modem

Thu Nov 10, 2016 6:43 pm

I have never tried that. You should be able to look at the netmask assigned to your router and figure out your remaining IPs
the cable modem will support. Assign fixed IP on the devices. Do not NAT those devices.
You may also need to add route entries to the ports those devices are attached to.
Thanks, I will try to creste more dhcp-client interfaces.

Regards

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