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I've just recently set up IP masq between my internal LAN and my
Roadrunner cable modem.  FTP transfers are considerably slower--about half
the speed as those from the gateway machine itself.  The gateway machine
is a Cyrix P-200+ with 64MB of RAM.  The card connected to the cable modem
is an Intel EtherExpress Pro 100B (PCI), set to 10baseT half-duplex mode
with the mii-diag program.  The card connected to my internal network is
an AE200-JL generic ISA NE2000 clone.  The IP on the NE2k is 192.168.0.1;
the IP for the external NIC is retrieved via DHCP.  FTP'ing from the
gateway machine to my ISP or to kernel.org, I get about 2Mbps.  FTP'ing
from one of the machines on my internal LAN, however, I get ~700Kbps.  
FTP'ing from one of the internal machines to the gateway itself works
fine-- 6Mbps or so.  The MTUs on both interfaces are 1500.  tcpdump
doesn't seem to be showing any fragmented packets on either interface.  
The machine has 95% free CPU and 24MB free RAM during the file transfer,
and ifconfig shows no errors and very few collisions on either interface.  
cat /proc/interrupts doesn't reveal that either interface is using an
excessive number of interrupts, and there are no interrupt conflicts.  I
have the ip_masq_ftp.o module loaded, and I am currently using just the
default set of ipchains rules as outlined in the IP masq FAQ.

IP masq was easy to set up and has been working well, but it is
frustrating to know that my speed is just a fraction of what it could
be.  I've tried everything I can think of.  Any suggestions appreciated.

Thanks,
Gabe Jones

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