On 23.01.2018 19:17, Alan Somers wrote: >>> Unfortunately, pf currently lacks this capability. But it looks like it >>> could be added without breaking existing pf.conf syntax. Would this be a >>> good idea? >>> >>> I don't use ipfw, but from reading the man page I believe that it has the >>> same problem. >> >> I think ipfw should work with such configuration using "fwd" action, >> since TCP/UDP has special handling for this. > > > The man page says that the fwd directive always takes an IP address. What > I need is a way to forward the port without changing the IP address. Is > that possible in ipfw?
"fwd" rule does not changing nor IP address, nor port. It uses some magic with PCB lookup in the TCP/UDP code. Just tried this: # ipfw add fwd ::1,5678 tcp from any to any 4000 # nc -6 -l ::1 5678 And from another host tried: # telnet -6 fc00::1 4000 And this works. -- WBR, Andrey V. Elsukov
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