I'm trying to setup multiple wireless interfaces/SSIDs (private and guest) on a WL-500gx running OpenWrt Kamikaze r7213

The first interface (wl0) for private use should be bridged to the lan interface (eth0.0) and the second (wl0.1) should not be member of any bridge and have it's own IP.

snippet from /etc/config/network

#### LAN configuration
config interface lan
        option type     bridge
        option ifname   "eth0.0"
        option proto    static
        option ipaddr   192.168.10.1
        option netmask  255.255.255.0

config interface guest
        option ifname   "wl0.1"
        option proto    static
        option ipaddr   192.168.11.1
        option netmask  255.255.255.0

/etc/config/wireless

config wifi-device  wl0
        option type     broadcom
        option channel  1
# disable radio to prevent an open ap after reflashing:
        option disabled 0

config wifi-iface
        option device       wl0
        option network      lan
        option mode         ap
        option ssid         "main"
        option hidden       "0"
        option encryption   "psk"
        option key          "test"

config wifi-iface
    option device       "wl0"
    option mode         "ap"
    option ssid         "guest"
    option hidden       "0"
    option encryption   "psk"
    option key          "test"

The nas binary for wl0.1 is not running after a reboot of the router.
The problem seems to be with the nas binary, it cannot run with command line parameters for the second wl0.1 interface.

root@OpenWrt:~# /usr/sbin/nas -P /var/run/nas.wl0.1.pid -H 34954 -i wl0.1 -A -m 4 -w 2 -s guest -g 3600 -k test
Command line parsing error. Quitting...

The wl0.1 interface is up and configured with its IP.

If I remove the definition for guest/wl.01 from /etc/config/network, the nas command is successfully started automatically with the following parameters:
/usr/sbin/nas -P /var/run/nas.wl0.1.pid -H 34954 -l br-lan -i wl0.1 -A -m 4 -w 2 -s guest -g 3600 -k test

But why the parameter "-l br-lan"? It shouldn't be part of the lan bridge!
brctl shows it's not member of br-lan:
bridge name     bridge id               STP enabled     interfaces
br-lan          8000.0013d4103a42       no              eth0.0
                                                        wl0

Associating with this SSID and getting an IP via DHCP is not possible at this stage.

If I add the IP of wl0.1 manually via ifconfig wl0.1 192.168.11.1, it is still not possible to get an IP via DHCP.

If I kill the nas process for wl0.1 and restart it with the following parameters, DHCP and internet access works fine:
/usr/sbin/nas -P /var/run/nas.wl0.1.pid -H 34954 -i wl0.1 -A -m 4 -w 2 -s guest -g 3600 -k test

And what's the difference to my initial configuration? Just the order of starting nas, setting up the ip for wl0.1?
And why is there a "-l br-lan" parameter for the automatic nas startup, even if it's not member of a bridge?
Is there any working configuration variant, without doing it all by myself?