finalmente

dopo averlo collegato a ont esterno, ho l'indirizzo del gateway (purtroppo di classe 1.255)
ma con l'indirizzo mac E4:8F:34:3A:82:15
ho l'indirizzo del gateway seguente
/etc/config$ route |grep voip
1.201.96.1 * 255.255.255.255 UH 0 0 0 pppoe-voip
/etc/config$ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default net-2-44-116-1. 0.0.0.0 UG 0 0 0 pppoe-wan
1.201.96.1 * 255.255.255.255 UH 0 0 0 pppoe-voip
2.44.116.1 * 255.255.255.255 UH 0 0 0 pppoe-wan
192.168.1.0 * 255.255.255.0 U 0 0 0 br-lan
192.168.2.0 * 255.255.255.0 U 0 0 0 eth4
192.168.168.0 * 255.255.255.128 U 0 0 0 wl0_1
192.168.168.128 * 255.255.255.128 U 0 0 0 wl1_1