udpproxy / udpforwarder

A simple tool to forward upd packets to one destination in a bidirectional manner. For example, you can also use nginx or HAProxy for the job. For security reasons, all packets destined to the backend had to come from one IP. I remembered this tool because I needed to see DNS traffic. So here it is udpproxy

+--------+      +--------------+            
| Client <------>              |            
+--------+      |              <-->+--------+
+--------+      |    Proxy     |   | Server |
| Client <------>              <-->+--------+
+--------+      |              |
  ...           +--------------+             

docker run --rm --interactive --tty -p8053:53/udp -v .:/udpproxy -e UDPPROXY_USEFDS=9999 -e UDPPROXY_REUSEPORT=true bitnami/minideb \
 /udpproxy/udpproxy 172.17.0.2:53 192.168.0.1:53 -va -s