# policy based routing

```
iptables -t mangle -A OUTPUT -o ${INTERFACE} -p tcp -m tcp --dport 53    -j MARK --set-xmark 0x47/0xffffffff
iptables -t mangle -A OUTPUT -o ${INTERFACE} -p udp -m udp --dport 53    -j MARK --set-xmark 0x47/0xffffffff
```

# /etc/sysctl.d/pbr.conf

```
net.ipv4.conf.wlp4s0.rp_filter=2
net.ipv4.conf.enp0s20u1u1i5.rp_filter=2
```