given the following rules:

# Permit internal network to send packets through the firewall
pass in quick on $INT_IF from $INT_IF:network to any flags S/SA keep state

# Permit traffic from firewall to initiate connection to internal network:
pass out quick on $INT_IF from any to $INT_IF:network flags S/SA keep state

..I have noticed that if I use 'keep state' ftp rates are fine (machine to machine...not via ftp-proxy) but if I change this to 'modulate state'
my ftp rates fall...

For example...moving a 50MB file:

'keep state' = 11-12MB/sec over 100MB-FDX
'modulate state = 6-7MB/sec over 100MB-FDX

..it took me a while to determine the culprit here - but I am curious as to why this is the case?

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