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Occasional Contributor II

Source nat inside, with external DHCP via DHCP Helper Address?

We've got a few controller-only VLANs set up running source nat inside and local DHCP scopes on the controller, but I'm doing some testing to see about using our existing external DHCP server for these VLANs.  So far I'm not having much luck.  Here's the setup:

 

Role: vending, VLAN51

any any dhcp permit

block internal networks (10.x)

allowall

 

VLAN/IP: 51

IP: 192.168.3.1/24

source nat inside

DHCP Helper Address: 10.64.10.23 (the controller can reach this)

This VLAN isn't associated with any physical port or port channel.

 

Will this not work, or am I just missing something dumb?

Guru Elite

Re: Source nat inside, with external DHCP via DHCP Helper Address?

Unfoortunately, it will not work across a source-nat boundary.

 

There has been alot of back and forth on this in the distant past, and since ArubaOS 6.2 the controller source ip in the DHCP packet has always been the controller uplink IP instead of the unroutable default gateway of natted clients.  This is the reason why it wold not work with natted clients on the controller.


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Occasional Contributor II

Re: Source nat inside, with external DHCP via DHCP Helper Address?

Thanks Colin!

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