# In traffic speed down via xl0
${fwcmd} add $C $(C=$(($C+$STEP))) pipe 1 tcp from any to any in via xl0
${fwcmd} pipe 1 config mask dst-ip 0x000000ff bw 32Kbyte/s queue 30 delay 10ms

# Out traffic speed down via xl0
${fwcmd} add $C $(C=$(($C+$STEP))) pipe 2 tcp from any to any out via xl0
${fwcmd} pipe 2 config mask src-ip 0x000000ff bw 32Kbyte/s queue 50 delay 10ms

у меня так...