ftp with squid 2

Hi,
I am using 2.2.STABLE3 for i686-pc-linux-gnu on my linux box together with
a packet filter. for ftp transactions the filter accepts connections from
my box to an other machine to port 21 and 20. with ftp from command line its
work quiet well but not when i using suid becaus squid do not use port 20
for data but something >1024. how can i tell squid to use port 20 for ftp
data?

thaks nils

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