# How to use geneies acs

**URL:** <https://forum.genieacs.com/t/how-to-use-geneies-acs/3008>\
**Category:** Uncategorized\
**Created:** [September 25, 2022, 5:24pm UTC](https://forum.genieacs.com/t/how-to-use-geneies-acs/3008 "2022-09-25T17:24:27Z")\
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**Author:** ![akcoder](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.genieacs.com/akcoder/32/11_2.png) [@akcoder](https://forum.genieacs.com/u/akcoder)\
**Post date:** [September 26, 2022, 4:27pm UTC](https://forum.genieacs.com/t/how-to-use-geneies-acs/3008/3 "2022-09-26T16:27:01Z")

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DHCP option 43 for the ACS URL. You probably want to do option 121 as well to add a static classless route back to your ACS server.

@tiger4020, depending on what your equipment supports, ideally you want to configure your customer prem equipment with two network interfaces. One for PPPoE, and one management. Our management network is DHCP and we use option 43 and 121.

Maintaining two interfaces gives you a lot of benefits. You can always see signal levels of the equipment, even if the customers service is turned off for non-payment. You can also switch the equipment back and forth between routed and bridged without the customer needing to factory default the equipment.

> [@Access to bridge type Modems](https://forum.genieacs.com/t/access-to-bridge-type-modems/1956/3):
>
> We do exactly this. First, you have to change your CPE config to have two interfaces for each WAN service. One for PPPoE, one for management. Our management network lives in the 172.16. 0.0/12 IP space and gets its IP via DHCP. We hard-code the ACS IP into the CPE, but also send it via option 43. This allows us to switch a CPE from the production to the test network without having to reconfigure it. On the test network, the DHCP server sends a different URL for the ACS. When the CPE boots up an…

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