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DMZ help Please

I am trying to setup a dmz with real ip's, but the problem I'm having is the range the isp assigned me 12.x.x.x with a mask of 255.255.255.240, now the first nic is assigned an ip address, but when i assign the 2 nic astaro complains that the network already exists, I guess because of the mask. I tried 255.255.255.255 and 254, but noone can communicate with that nic in the DMZ, If this isn't clear let me know, I hope someone can help me

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0 firebear_01 over 22 years ago

Hello,
i think the ip-range your isp give to you is used by you in the dmz or at your internet-zone but you could not use it for both. so maybe you use it in your dmz and your isp give dynamical an ip-adress to your internet interface.

firebear
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0 Andy_01 over 22 years ago in reply to firebear_01

marcuu, what you could do is, use the first 8 IPs for the external interface and the next 8 for the DMZ. Let's say your provider assigned you 1.2.3.0/255.255.255.240 cou could split that in 1.2.3.0/255.255.255.248 and 1.2.3.9/255.255.255.248. This way your external interface could be 1.2.3.1/255.255.255.248 and the DMZ interface 1.2.3.9/255.255.255.248, 1.2.3.10 - 1.2.3.14 could be used for hosts in the DMZ. To do so you need to activate the proxy ARP on the external interface (advanced settings).
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0 marcuu over 22 years ago in reply to Andy_01

thx for the help, I reall appreciate it
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0 firebear_01 over 22 years ago in reply to marcuu

Hello,
if you do like marcus said you have inconsistent subnetmasks your provider use not the same subnetmask like you.
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0 Andy_01 over 22 years ago in reply to firebear_01

firebear, I guess you meant my answer... That's correct, the subnet masks are different, that's why you have to activate the proxy ARP.
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0 tonyb over 22 years ago in reply to Andy_01

Andy, can you do the same with only 8 IP addresses provided by the ISP. i.e. an w.x.y.z/255.255.255.248 range? If not then is it possible to have a DMZ with machines with public addresses?
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0 Andy_01 over 22 years ago in reply to tonyb

you can split your 8 IPs in twice 4, but you loose some IPs since only 4 are usable then. Of course you could use private IPs in the DMZ and use DNAT
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0 Andy_01 over 22 years ago in reply to tonyb

you can split your 8 IPs in twice 4, but you loose some IPs since only 4 are usable then. Of course you could use private IPs in the DMZ and use DNAT
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