Thank you for providing this excellent firmware and the support for it. I have had a slightly weird syndrome since switching from dd-wrt to TomatoUSB this year and after a long period of troubleshooting I've decided to try to seek help for it here.
My network topology is that I have two ASUS RT-AC66U routers both running the latest Shibby builds, and one is the base station that connects to the outside via PPPoE and provides a 2.4gHz and a (differently-named) 5gHz wlan. The second router connects to the first over the 5gHz wlan and provides a bridge to a different part of the building (as a bridge, it is only connected to via ethernet – the second router does not provide wlan).
The issue is that when the laptops on the 2.4gHz wlan first are opened up and connect to it, it takes between one and four minutes (in rare cases longer) before it is possible for them to ping the outside world. My guess is that the servers would also manifest the same issue except that they don't have the feature of unassociating and reassociating so the issue is concealed. When I look at the network settings of one of the Macbooks with this issue while it can't connect, I see that everything is correct: they have a real IP address with the correct subnet mask and router, and real DNS servers.
Things I have already tried which made no difference (in all of the cases described below, internet worked fine, but only after 1-4 minutes after the laptop was woken up):
Turning off local DNSmasq services on the router
Not doing PPPoE from the base station router but using my Telekom modem to connect and setting the base station router to use DHCP for the WAN
Force the Macbooks to use the router IP as DNS server rather than obtaining DNS servers dynamically from the DHCP process
Force the Macbooks to always use Google's DNS servers
Put in all of the network settings manually in the Macbook Network control panel
Changed the PPPoE MTU from 1492 to 1500 and back
Can anyone help me get this one last issue under wraps? It isn't a show-stopper but it is causing grumpiness among users of the network. Thank you for any assistance!