ipf "keep state" rules, tftpd and inetd

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

I ran into a strange problem (tftp not working) caused by the fact that, if 
tftpd is run via inetd, the reply to the original request packet originates 
from a different port than that the request was sent to. So my "keep state" 
rule in ipf.conf doesn't make the reply pass the filter rules.

I guess this is a standard problem, so what's the standard solution to it?

Is there a relaxed form of "keep state" where the sending port is allowed to 
differ from the receiving port and only the other end's port and the IP 
addresses need to match?