Group, I have a Linux Box setup with netfilter acting as a proxy/nat/fw. The only service running is caching dns service. Through iptables I block all access except for one external DNS server and one external proxy server on the external Nic. Of course only a HTTP and DNS port is allowed out(using state) and nothing allowed out.
Is it normal to find udp ports 137-139 listining when scanned with Nmap. I have set up a fresh box with the same config, but not the same source files and I get the Same thing. Whats up with that.. Chris N.
