Why is this static routing not working ?

Posted by geeko on Server Fault See other posts from Server Fault or by geeko
Published on 2010-03-15T18:46:19Z Indexed on 2010/03/15 19:30 UTC
Read the original article Hit count: 291

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I'm trying to develop a DHCP enforcement extension like Microsoft NAP. My trick to block dynamic-IP requesting machines (that don't meet certain policy) is to strip the default gateway (no default gateway) stated in the IP lease and set the lease subnet mask to 255.255.255.255.

Now I need the blocked machines to be able to reach some specific locations (IPs) on the network. To allow for this, I'm including some static routes in the lease. For example, I'm including 10.10.10.11 via router 10.10.10.254 (the one to which the blocked machine that needs to access 10.10.10.11 is connected).

Unfortunately, as soon as I set the default gateway to nothing, blocked machines cannot reach any of the added static routes. I also tried classless static routes.

Any ideas ? any one knows how MS NAP actually do it ?

Geeko

Why is this static routing not working ?

Posted by geeko on Stack Overflow See other posts from Stack Overflow or by geeko
Published on 2010-03-15T18:46:19Z Indexed on 2010/03/15 18:49 UTC
Read the original article Hit count: 291

Filed under:

gateway

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subnet

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mask

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static

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routes

Greeting gurus,

I'm trying to develop a DHCP enforcement extension like Microsoft NAP. My trick to block dynamic-IP requesting machines (that don't meet certain policy) is to strip the default gateway (no default gateway) stated in the IP lease and set the lease subnet mask to 255.255.255.255.

Now I need the blocked machines to be able to reach some specific locations (IPs) on the network. To allow for this, I'm including some static routes in the lease. For example, I'm including 10.10.10.11 via router 10.10.10.254 (the one to which the blocked machine that needs to access 10.10.10.11 is connected).

Unfortunately, as soon as I set the default gateway to nothing, blocked machines cannot reach any of the added static routes. I also tried classless static routes.

Any ideas ? any one knows how MS NAP actually do it ?

Geeko

Developer IT