What do you mean by "old method" ?
Changing my old WRT54G to 3500L and 3800, but with 3800 don't have the VLAN menu to create a separate LAN subnet on a dedicated rj45 entry. (this exist in 3500L)
Is it a hardware restriction ?
is it possible to use the "old method" thru nvram command ?
My version dd-wrt svn 19342
He probably meant with iptables instead of GUI metod
I am not promoting any certain firmware... you want port pased group switching? DD-WRT doesn't support it with Atheros based units, openwrt does... can you imagine if you want some feature that isn't supported in your current firmware that you may have to use another? You are right, i'll keep note of your nickname and ip and never will i try to help you in any post ever again.
Actually dd-wrt doesn't support it in a good way on the WNR3500L either. It just writes stuff to nvram, and let's the proprietary binary blob ethernet driver configure the switch. (It's the main reason I have never used my 3 WNR3500L's, I could not configure the switch)
Since the WNDR3800 has an open-source ethernet driver that doesn't configure the switch it might not work as suspected in DD-WRT.
I think buddee's advice is a good advice. If you want to stick with dd-wrt (you have a good reason to, the web interface is pretty slick), you must use a manual method.
If you have not resolved it, it's pretty simple by just adding a script that configures the switch on bootup.
Note however that the WNDR3700 and WNDR3800 and WNDRMAC have 2(!) ethernet ports. On the outside you have an ethernet port directly attached to the CPU, and a highly configurable 6 ports switch with a no-connection on the 5th port and the second ethernet port of the CPU on the 6th.
This is different from the WRT54G and the WNR3500L, which have 1 ethernet port connected to a switch.