<![CDATA[Multiple IP to one MAC]]>How can I assign multiple IPs to single MAC address in DHCP?

]]>https://forum.netgate.com/topic/41518/multiple-ip-to-one-macRSS for NodeTue, 13 Oct 2026 16:52:52 GMTTue, 31 Jan 2012 09:49:13 GMT60<![CDATA[Reply to Multiple IP to one MAC on Thu, 02 Feb 2012 21:22:21 GMT]]>I don't know about IP Alias, but if you used CARP instead, the MAC Addresses will be slightly different. Are you hard assigning the addresses even though they are in DHCP reservations?

]]>https://forum.netgate.com/post/318294https://forum.netgate.com/post/318294Thu, 02 Feb 2012 21:22:21 GMT<![CDATA[Reply to Multiple IP to one MAC on Thu, 02 Feb 2012 00:31:48 GMT]]>@voytec:

How to configure pfsense routers for this
87.92.15.10 <–> 192.168.0.10
87.92.15.20 <--> 192.168.0.20

On pfSense 1 create 1:1 NAT  (Firewall -> NAT, 1:1 tab) on the WAN interface: 87.92.15.10 –> 192.168.0.10 and 87.92.15.20 --> 192.168.0.20 and add a static route to 192.168.0.0/24 with gateway 10.10.0.100. You will also need to disable NAT on pfSense2.

]]>https://forum.netgate.com/post/318074https://forum.netgate.com/post/318074Thu, 02 Feb 2012 00:31:48 GMT<![CDATA[Reply to Multiple IP to one MAC on Wed, 01 Feb 2012 14:31:38 GMT]]>@podilarius:

Are you looking to get rid of the double NAT or are you replacing the router with a different pfsense machine? What is your current dhcp config?

How to configure pfsense routers for this
87.92.15.10 <–> 192.168.0.10
87.92.15.20 <--> 192.168.0.20

the problem is: staticARP works only with staticDHCP, but I can't add two identical MACs for 10.10.0.100, 10.10.0.101, 10.10.0.102

net.jpg_thumb
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]]>https://forum.netgate.com/post/317961https://forum.netgate.com/post/317961Wed, 01 Feb 2012 14:31:38 GMT<![CDATA[Reply to Multiple IP to one MAC on Tue, 31 Jan 2012 19:53:41 GMT]]>Basically it will work the same way freebsd router. You will create WAN address and then assign either IP alias or CARP to WAN IPs. Then you will use the 1:1 NAT to point publicip_1 to privateip_1. Then you will create all the rules associated with that. Are you looking to get rid of the double NAT or are you replacing the router with a different pfsense machine? What is your current dhcp config?

]]>https://forum.netgate.com/post/317820https://forum.netgate.com/post/317820Tue, 31 Jan 2012 19:53:41 GMT<![CDATA[Reply to Multiple IP to one MAC on Tue, 31 Jan 2012 17:32:51 GMT]]>now I've double NAT 1:1

router on FreeBSD (natd, ipfw):
 WAN: publicIP /24 with "IP Alias" publicIP_1, publicIP_2, publicIP_3
 LAN: static_DHCP with StaticARP 10.10.0.0/24
 NAT 1:1: publicIP_1 <-> 10.10.0.100,
               publicIP_2 <-> 10.10.0.101,
               publicIP_3 <-> 10.10.0.102

and in LAN network pfSense box:
     WAN IP from DHCP: 10.10.0.100 with "IP Alias" 10.10.0.101, 10.10.0.102
     local_LAN: 192.168.0.1/24
     NAT 1:1: 10.10.0.101 <-> 192.168.0.10,
                   10.10.0.102 <-> 192.168.0.20

in local_LAN:
            Server1 IP: 192.168.0.10
            Server2 IP: 192.168.0.20

and working efect:
      publicIP_1 <-> 10.10.0.100 (pfsense b0x)
      publicIP_2 <-> 192.168.0.10 (Serwer_1)
      publicIP_3 <-> 192.168.0.20 (Serwer_1)

I must change FreeBSD router to pfSense and I do not know how to do this configuration.

I know that this DHCP configuration does nosense but is associated with StaticARP.

]]>https://forum.netgate.com/post/317777https://forum.netgate.com/post/317777Tue, 31 Jan 2012 17:32:51 GMT<![CDATA[Reply to Multiple IP to one MAC on Tue, 31 Jan 2012 13:43:34 GMT]]>I don't know if that is possible. Are you going to be assigning it to a different subnet? In *nux you can create a virtual interface and have it setup for dhcp. You should be able to assign based on that. I don't know about windows os. unless you are setting a reservation, it is just going to get a different address in the same network and no do any real good.

]]>https://forum.netgate.com/post/317720https://forum.netgate.com/post/317720Tue, 31 Jan 2012 13:43:34 GMT