boost asio在linux接收不到255.255.255.255的应答

echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
echo 0 > /proc/sys/net/ipv4/conf/eth0/rp_filter

https://stackoverflow.com/questions/47829979/how-to-receive-a-udp-broadcast-sent-to-255-255-255-255-using-boost-asio