Thanks for the explanation, though. Low-level TCP stuff is not my forte... yet.
Bill
On Nov 1, 2004, at 11:27 AM, Aaron Nichols wrote:
I believe you'll have one additional problem to resolve. Even if you successfully modify the destination IP address and get it pointed to the upstream server, the source IP will be unmodified and will still be the originator. Since the source IP is unmodified - the upstream mail server will send an ACK back to the originators IP (not yours) which will most likely get discarded and the connection will fail. Most sane TCP/IP stacks will reject an ACK from an IP address to which it did not send a request. Since the ACK is not going to run back through your host (thus allowing natd another go at reversing the translation) this likely wont work.
Sorry all - I had missed the post regarding use of the -proxy_rule option, which may address this issue.
Didn't mean to futher confuse the issue.
Aaron
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