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MAC address DHCP - 25.Aug.2008 2:26:46 PM

RedDog

Posts: 74
Joined: 11.Feb.2002
Status: offline

Is it possible to make a rule using MAC address? I need one device (a router) to connect to our ISP using DHCP to obtain an IP, so need a rule for that device only to go through ISA and obtain DHCP IP from ISP rather than internal DHCP server.

Thanks

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RE: MAC address DHCP - 25.Aug.2008 3:53:16 PM

Rotorblade

Posts: 963
Joined: 27.Feb.2007
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What exactly are you trying to accomplish?

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David Melvin
Ohio
MCSE: Security 2003, MCSA:Security 2003

(in reply to RedDog)

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RE: MAC address DHCP - 25.Aug.2008 4:06:54 PM

pwindell

Posts: 782
Joined: 12.Apr.2004
From: Taylorville, IL
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1. Just flat impossible. The device cannot get an IP# that does not belong to the IP Segment that the device exists on.

2. If the "router" needs an IP# from the ISP,...then you have it on the wrong side of the ISA. If the ISA is a single nic cache-only ISA, then the ISA is not even relevant and the communication is not going through the ISA to begin with.

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Phillip Windell
www.wandtv.com

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RE: MAC address DHCP - 25.Aug.2008 5:31:50 PM

Rotorblade

Posts: 963
Joined: 27.Feb.2007
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Phil,

I was going to say that but wanted to give him the benefit to possibly explain the situation to better offer a solution.

Dave

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David Melvin
Ohio
MCSE: Security 2003, MCSA:Security 2003

(in reply to pwindell)

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RE: MAC address DHCP - 25.Aug.2008 10:15:36 PM

RedDog

Posts: 74
Joined: 11.Feb.2002
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Question was mainly for my ISP, they wanted me to configure a router a certain way, I told them couldn't, the fight was on. I just wanted some ammunition, and to make double sure of the answer before I went back to them. I told them wouldn't work, but they insisted it would. I wanted to setup a test computer instead of the router that way, just to prove/disprove.

Ended up, after escalating the call with ISP's tech support, that we finally got things worked out.

(a bit of bull-headedness on both our parts).

Thanks.

(in reply to RedDog)

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RE: MAC address DHCP - 26.Aug.2008 10:16:39 AM

pwindell

Posts: 782
Joined: 12.Apr.2004
From: Taylorville, IL
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In many cases the "first level" tech support for ISP's just "doesn't have a clue" and they only understand things in terms of "home users" and the way things would be setup in grandma's house. What they call a "router" is not a real router, but is nothing but a "low dollar" NAT Firewall. This would not be a LAN Router on the Internal side of the ISA as would be common in a commercial environment.

Unless you have a back-to-back DMZ the ISA would be the "router" as they are seeing it.

If you have a back-to-back DMZ then the [so called] "router" would be external tot he ISA and the ISA would be irrelevant to the whole matter.

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Phillip Windell
www.wandtv.com

(in reply to RedDog)

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RE: MAC address DHCP - 26.Aug.2008 10:18:32 AM

pwindell

Posts: 782
Joined: 12.Apr.2004
From: Taylorville, IL
Status: offline

quote:

Phil,

I was going to say that but wanted to give him the benefit to possibly explain the situation to better offer a solution.

Dave

Yea after my first post, I thought I'd wait a bit and see what more came out as well. I hadn't thought about the DMZ possiblity that you menationed.

_____________________________

Phillip Windell
www.wandtv.com

(in reply to Rotorblade)

Post #: 7