One download saturates bandwidth on NAT box

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I have Mandrake 8 installed on a PII 450 box running a 2.4.4 kernel
with all netfilter options compiled directly in the kernel. This machine
does nothing but firewall and NAT duty. It has an external (serial port)
56k modem for the outgoing connect, and a realtek based 10/100 PCI card
for the local net. I am using gShield
(http://muse.linuxmafia.org/gshield.html) for the firewall.

When i start a download from one of the client machines, it uses all the
bandwidth.  I can get some functionality from the firewall box itself, but
none of the clients can ping anything not on the local net, including the
one doing the downloading. This did not happen with ipchains on a 2.2
kernel. Is there an option I'm missing somewhere?

Tim

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