The Archer C9 AC1900 router comes with TP Link's own firmware from the factory. There are third party vendors at put other firmware such as DD-WRT on the routers and sell them. The C9 is at the "end of life" per the TP Link's web site https://www.tp-link.com/us/home-networking/wifi-router/archer-c9/. You will need to go to the DD-WRT web sites to see if certain features are supported in DD-WRT. I have used DD-WRT many years ago but now I am reluctant to do so as it is basically a hack by hackers and now more and more hackers attack routers as an entry point into your network.

@Chille 

 

There is more than ONE TP-Link router that is AC1900. C80, A9, A8 and other models that are older and might be still available. All will ship with TP-Links standard f/w for the router.

 

I suggest you use the exact model number/name and check the DD-WRT site itself to see if it has f/w for that model (and some routers have VERSIONS as well that need to be matched). See https://dd-wrt.com/ for more info and/or use the forums there. I searched the download database for TP-Link and they have got none of the above models on the list but do have a C9 listed. Could check by posting on the forum I guess? They do have a C7 version with I think is now still being sold, but an AC1750 router.

@IrvSp Looking at the box, the AC1900 I have is an A9. The basic question is: Does this router support DNSMASQ? I need this feature to support my server and PXE booting from remote clients. If it does not support DNSMASQ, I cannot use the router and will have to return it to the vendor.

Thank you.

@Chille 

 

Don't know, but if it isn't called out in the spec's, probably not.

 

DD-WRT does include it though, you might want to check in the forums there.