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Run Windows DHCP server or Router DHCP?

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#1 Jason

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Posted 20 March 2017 - 12:45 PM

Have been running a Windows DHCP server on home WSE12R2 box for quite some time behind my Sophos UTM firewall. Also allowed me to seamlessly run Windows Deployment Services at home. WDS just worked.

But if I needed to make a particular LAN IP address exception on the firewall, I had to 1.) create a Windows DHCP server reservations AND 2.) create a network definition for that IP on the Sophos UTM box. 2 steps. Not very efficient; was sure I was doing something incorrectly...

Tried to migrate to Sophos UTM running the DHCP Server, but now WDS doesn't work. LAN devices can no longer PXE boot. Seems possible. Many guides. None have proven especially successful.

Is it possible to run a Windows DHCP server and have Sophos UTM import DHCP reservations instead of maintaining 2 unique entries for each IP reservation (one in Windows DHCP, another on Sophos UTM box)?

What is best practice?


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#2 Drashna Jaelre

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Posted 20 March 2017 - 04:33 PM

Yes. 

This is precisely what I do, actually. 

 

No settings need to be set on the Sophos UTM DHCP server. 

Basically, do not enable any of the TFTP options for it. Or any custom options. 

 

On the WDS server console, right click on the server name and select "Properties"

Go to the "DHCP" tab, and make sure both options are unchecked. 

 

Restart the WDS service, and then you should start getting responses

 

 

Specifically, the "do not listing on DHCP ports" is probably the issue here. 

disabling this means it listens for and may respond to "DHCP" requests. But it's not a "real" DHCP server. It's just a partial one. It still relies on an actual DHCP server to be on the network.  


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Christopher Courtney
Microsoft MVP for Windows Home Server 2009-2012
Lead Moderator for We Got Served
Director of Customer Relations for CoveCube (StableBit)


Windows Server 2012R2 Essentials:
Supermicro SC847E26-R1K28LP, SuperMicro X10SAT, Intel E3 1245v3 (Haswell) 16GB RAM (ECC), ADATA Premier Pro SP900 240GB SSD OS disk, StableBit DrivePool: 117TB, IBM ServeRAID m1015 cross-flashed to "IR" (RAID) mode

 

HyperV Server 2012R2:

SuperMicro SYS-6016T-NTF, SuperMicro X8DTU motherboard, Dual Intel Xeon X5560, 16GB (ECC-Registered), 120GB HDD OS Disk, Crucial MX100 500GB SSD for HyperV storage.

 

Dedicated Emby Server (Windows 10 Pro):

Random 1U case, SuperMicro X8DTi motherboard, Dual Intel Xeon X5660, 20GB (ECC-Registered), 64GB ADATA SSD OS Disk, 120GB ADATA SSD for data storage

 
Sophos UTM: 
Antec ISK 110 VESA case, ASRock RACK J1900D2Y, 4GB of non-ECC RAM, Samsung 850 Pro 120GB SSD OS drive.

 

When I say "linux", I'm being lazy and I do mean "*NIX/UNIX based operating systems". That includes Linux, BSD, UNIX, etc. 

 


#3 Jason

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Posted 20 March 2017 - 08:36 PM

Thanks. This helps. I wouldn't have found these options on me own.

Prior to making that change, I did learn how to configure the DHCP > Options on Sophos UTM to work with WDS. It wasn't exactly straight forward. Code 66 and 67.


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#4 Drashna Jaelre

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Posted 20 March 2017 - 09:39 PM

Yeah, that's the "official" way to do so, but I've found that it really, really doesn't work.


Christopher Courtney
Microsoft MVP for Windows Home Server 2009-2012
Lead Moderator for We Got Served
Director of Customer Relations for CoveCube (StableBit)


Windows Server 2012R2 Essentials:
Supermicro SC847E26-R1K28LP, SuperMicro X10SAT, Intel E3 1245v3 (Haswell) 16GB RAM (ECC), ADATA Premier Pro SP900 240GB SSD OS disk, StableBit DrivePool: 117TB, IBM ServeRAID m1015 cross-flashed to "IR" (RAID) mode

 

HyperV Server 2012R2:

SuperMicro SYS-6016T-NTF, SuperMicro X8DTU motherboard, Dual Intel Xeon X5560, 16GB (ECC-Registered), 120GB HDD OS Disk, Crucial MX100 500GB SSD for HyperV storage.

 

Dedicated Emby Server (Windows 10 Pro):

Random 1U case, SuperMicro X8DTi motherboard, Dual Intel Xeon X5660, 20GB (ECC-Registered), 64GB ADATA SSD OS Disk, 120GB ADATA SSD for data storage

 
Sophos UTM: 
Antec ISK 110 VESA case, ASRock RACK J1900D2Y, 4GB of non-ECC RAM, Samsung 850 Pro 120GB SSD OS drive.

 

When I say "linux", I'm being lazy and I do mean "*NIX/UNIX based operating systems". That includes Linux, BSD, UNIX, etc. 

 






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