Natd is a very cool tool for doing stuff like redirecting connections from an external network to an internal one but I'm have a slightly different problem. I have a single host with one public interface:
host - fxp0 = 192.168.7.251
Also on this same host is a bunch more IP's on the loopback interface:
host - lo0 = 127.0.0.1
127.0.0.2
.....
On each of the loopback addresses I have a DNS server listening. This part works just fine:
matt@matt: {101} % dig www.foo.com @127.0.0.2
<verbosity snipped>
;; ANSWER SECTION:
www.foo.com. 1D IN A 207.89.154.94
What I want to be able to do is send a dns query to the external interface of the machine on a non-standard port and have it redirect the query to a loopback address/port and return the query the appropriate query result to me.
So, after reading the man page several times, I've tried using natd like this:
natd -n fxp0 -redirect_port udp 127.0.0.2:53 192.168.7.251:55
However, doing so simply get's me a connection refused when I send it a query like this:
matt@matt: {102} % dig -p 55 @192.168.7.251 www.foo.com
; <<>> DiG 8.3 <<>> -p @192.168.7.251 www.foo.com
; (1 server found)
;; res options: init recurs defnam dnsrch
;; res_nsend to server 192.168.7.251: Connection refused
matt@matt: {103} %
I'm not exactly certain why it's failing. Is this the best approach to solving this problem? Is there a better way to go about this?
Matt
