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cannot get node dns program to work externally




Hi,

I have a node.js based dns program on port 53 and have it working as localhost on debian 8.5 but I cannot seem to get it to work externally despite getting the firewall rules right having tested them with Bind9.

-A INPUT -p udp --dport 53 --sport 1024:65535 -j ACCEPT
-A OUTPUT -p udp --sport 53 --dport 1024:65535 -j ACCEPT
-A OUTPUT -p udp --sport 53 --dport 1024:65535 -j ACCEPT
-A INPUT -p udp --dport 53 --sport 1024:65535 -j ACCEPT

-A OUTPUT -p udp --sport 53 --dport 53 -j ACCEPT
-A INPUT -p udp --dport 53 --sport 53 -j ACCEPT

Also I have done :-

    setcap cap_net_bind_service=+ep /usr/bin/nodejs

to allow node to work with ports less than 1024.

I have my node dns program working on port 53 UDP with dig from localhost but Basically not externally on the local network and cannot work out why ?

I have mainly been using :-

    https://github.com/tjfontaine/node-dns/blob/master/examples/forwarder.js

for testing.

Its probably something obvious hope someone can help !

--
Aaron Gray

Independent Open Source Software Engineer, Computer Language Researcher, Information Theorist, and amateur computer scientist.