I've tested the Repeater Mode for DIR-615 D2 on 25179 and also the new test build 25737 (kindly provided by BrainSlayer yesterday). The problem in this ticket -- of not being able to connect to the Remote (Host) AP when Auto Channel is selected -- still remains.
DLink DIR-615 - any good? It's N(300). It was cheap Aug 28, 2010 DD-WRT – Custom Router Firmware – Flashing, Initial login Apr 16, 2019 DD-WRT How to? - The Cloud (Internet, Network, VPN Oct 17, 2010
OpenWrt Project: Techdata: D-Link DIR-615 E4
The DIR-615 supports the latest wireless security features to help prevent unauthorized access, be it from over a wireless network or from the Internet. Support for WPA and WPA2 standards ensure that you will be able to use the best possible encryption, regardless of your client devices. If you're looking for a dd-wrt compatible router and
Install DD-Wrt to D-Link DIR-615 - YouTube
Install DD-Wrt to D-Link DIR-615 - YouTube Jun 02, 2013 DD-WRT Forum :: View topic - WORKING - DIR-615 D4 wireless