broken

root@OpenWrt:~# root@OpenWrt:~# reset; \
> source /lib/functions/network.sh; \
> network_flush_cache; \
> network_find_wan NET_IF; \
> network_get_device NET_DEV "${NET_IF}"; \
> ifup "${NET_IF}"; sleep 10; \
> tcpdump -v -n -i "${NET_DEV}" udp port 67 or udp port 68 & \
> ip address show dev "${NET_DEV}"; \
> kill -SIGUSR2 "$(pidof udhcpc)"; sleep 10; \
> ip address show dev "${NET_DEV}"; \
> kill -SIGUSR1 "$(pidof udhcpc)"; sleep 10; \
> ip address show dev "${NET_DEV}"; \
> killall tcpdump
Interface  not found
Interface  not found
ip: can't find device ''
tcpdump: : No such device exists
(SIOCGIFHWADDR: No such device)
ip: can't find device ''
ip: can't find device ''
killall: tcpdump: no process killed
[1]+  Done(1)                    tcpdump -v -n -i "${NET_DEV}" udp port 67 or udp port 68
root@OpenWrt:~#