This is an example script that mangles all the bulgarian and international traffic (both download and upload)
# Change TCP MSS and mangle upload
/ip firewall mangle add in-interface=!WAN protocol=tcp tcp-options=syn-only action=passthrough tcp-mss=1400 disabled=no
/ip firewall mangle add in-interface=!WAN action=passthrough mark-flow=abu disabled=no
# Mangle download
/ip firewall mangle add in-interface=WAN action=passthrough mark-flow=abc disabled=no
:foreach i in 32.106.113.0/24,32.238.113.0/24,32.239.76.0/24,62.44.96.0/19,62.67.248.0/23,62.73.64.0/18,62.176.64.0/18,62.200.195.0/24,62.204.128.0/19,62.213.160.0/21,62.213.168.0/22,62.213.173.0/24,62.213.175.0/24,62.213.180.0/22,62.213.185.0/24,62.213.186.0/23,62.213.188.0/22,80.72.64.0/19,80.80.128.0/19,80.246.192.0/21,81.161.208.0/20,81.161.240.0/20,82.101.64.0/18,82.103.64.0/18,82.118.224.0/19,82.119.64.0/19,82.137.64.0/18,82.146.0.0/19,82.147.128.0/19,82.199.192.0/19,83.97.24.0/21,83.97.64.0/21,83.142.16.0/21,83.148.64.0/19,83.148.96.0/20,83.148.112.0/24,83.148.114.0/23,83.148.116.0/22,83.148.124.0/22,83.222.160.0/19,83.228.0.0/19,83.228.32.0/20,83.228.48.0/22,83.228.52.0/23,83.228.70.0/23,83.228.72.0/21,83.228.80.0/20,83.228.96.0/20,83.228.112.0/21,83.228.120.0/24,83.228.124.0/22,84.21.192.0/19,84.22.0.0/19,84.43.128.0/19,84.54.128.0/18,84.201.192.0/20,84.238.128.0/17,84.242.128.0/18,84.252.0.0/18,85.91.128.0/19,85.130.112.0/21,85.130.122.0/23,85.130.124.0/22,85.187.0.0/16,139.92.51.0/24,139.92.144.0/24,152.158.113.0/24,192.92.129.0/24,192.168.77.0/24,193.16.102.0/24,193.16.157.0/24,193.16.246.0/24,193.17.229.0/24,193.19.172.0/22,193.22.103.0/24,193.22.248.0/24,193.23.52.0/24,193.24.240.0/22,193.25.162.0/23,193.26.14.0/24,193.28.250.0/24,193.29.55.0/24,193.30.228.0/22,193.41.64.0/22,193.41.182.0/23,193.41.188.0/22,193.41.206.0/24,193.43.26.0/24,193.68.0.0/19,193.68.96.0/19,193.68.128.0/21,193.68.142.0/23,193.68.144.0/20,193.68.160.0/19,193.68.192.0/18,193.108.24.0/24,193.108.32.0/23,193.109.54.0/23,193.110.82.0/24,193.110.159.0/24,193.110.216.0/21,193.111.89.0/24,193.111.194.0/23,193.138.67.0/24,193.151.20.0/22,193.151.80.0/22,193.178.152.0/23,193.178.166.0/24,193.178.222.0/24,193.193.162.0/23,193.193.164.0/24,193.193.182.0/24,193.194.140.0/23,193.194.156.0/24,193.200.14.0/23,193.201.114.0/23,193.201.172.0/24,193.254.29.0/24,194.8.53.0/24,194.8.60.0/24,194.12.224.0/19,194.54.140.0/22,194.54.144.0/22,194.63.136.0/22,194.141.0.0/16,194.145.63.0/24,194.145.160.0/22,194.146.232.0/22,194.150.116.0/22,194.150.180.0/23,194.153.145.0/24,194.246.110.0/23,195.22.146.0/23,195.24.32.0/19,195.24.88.0/21,195.34.96.0/19,195.39.198.0/23,195.39.212.0/23,195.47.193.0/24,195.62.22.0/23,195.68.200.0/23,195.68.214.0/23,195.69.108.0/22,195.69.120.0/22,195.69.164.0/22,195.72.112.0/24,195.85.215.0/24,195.96.224.0/19,195.128.224.0/23,195.138.128.0/19,195.149.248.0/21,195.177.218.0/23,195.177.248.0/23,195.212.63.0/24,195.214.248.0/21,195.225.252.0/22,195.230.0.0/19,195.234.84.0/22,195.234.236.0/22,195.242.106.0/23,195.242.126.0/24,195.242.240.0/22,212.5.128.0/19,212.7.192.0/19,212.21.128.0/19,212.36.0.0/19,212.39.64.0/19,212.50.0.0/19,212.56.0.0/19,212.72.192.0/19,212.73.128.0/19,212.91.160.0/19,212.95.160.0/19,212.104.96.0/19,212.116.128.0/19,212.122.160.0/19,212.124.64.0/20,212.124.80.0/22,212.124.84.0/23,212.124.87.0/24,212.124.88.0/21,213.16.32.0/19,213.91.128.0/17,213.130.64.0/19,213.137.32.0/22,213.137.38.0/23,213.137.40.0/21,213.137.48.0/20,213.145.96.0/19,213.167.0.0/21,213.167.8.0/24,213.169.32.0/19,213.174.0.0/19,213.191.192.0/19,213.208.10.0/23,213.222.32.0/19,213.226.0.0/19,213.226.33.0/24,213.226.34.0/23,213.226.36.0/22,213.226.40.0/24,213.226.48.0/21,213.226.56.0/24,213.226.60.0/22,213.240.192.0/18,217.9.224.0/20,217.10.240.0/20,217.18.240.0/20,217.30.208.0/20,217.75.128.0/21,217.75.136.0/23,217.75.138.0/24,217.75.140.0/22,217.75.144.0/20,217.79.32.0/20,217.79.64.0/19,217.145.80.0/20,217.145.160.0/20,217.174.144.0/20,217.197.128.0/20 do {
/ip firewall mangle add action=passthrough flow=abc mark-flow=peer disabled=no src-address=$i
}
/ip firewall mangle add action=passthrough flow=abc mark-flow=inter disabled=no
# Mangle upload
:foreach i in 32.106.113.0/24,32.238.113.0/24,32.239.76.0/24,62.44.96.0/19,62.67.248.0/23,62.73.64.0/18,62.176.64.0/18,62.200.195.0/24,62.204.128.0/19,62.213.160.0/21,62.213.168.0/22,62.213.173.0/24,62.213.175.0/24,62.213.180.0/22,62.213.185.0/24,62.213.186.0/23,62.213.188.0/22,80.72.64.0/19,80.80.128.0/19,80.246.192.0/21,81.161.208.0/20,81.161.240.0/20,82.101.64.0/18,82.103.64.0/18,82.118.224.0/19,82.119.64.0/19,82.137.64.0/18,82.146.0.0/19,82.147.128.0/19,82.199.192.0/19,83.97.24.0/21,83.97.64.0/21,83.142.16.0/21,83.148.64.0/19,83.148.96.0/20,83.148.112.0/24,83.148.114.0/23,83.148.116.0/22,83.148.124.0/22,83.222.160.0/19,83.228.0.0/19,83.228.32.0/20,83.228.48.0/22,83.228.52.0/23,83.228.70.0/23,83.228.72.0/21,83.228.80.0/20,83.228.96.0/20,83.228.112.0/21,83.228.120.0/24,83.228.124.0/22,84.21.192.0/19,84.22.0.0/19,84.43.128.0/19,84.54.128.0/18,84.201.192.0/20,84.238.128.0/17,84.242.128.0/18,84.252.0.0/18,85.91.128.0/19,85.130.112.0/21,85.130.122.0/23,85.130.124.0/22,85.187.0.0/16,139.92.51.0/24,139.92.144.0/24,152.158.113.0/24,192.92.129.0/24,192.168.77.0/24,193.16.102.0/24,193.16.157.0/24,193.16.246.0/24,193.17.229.0/24,193.19.172.0/22,193.22.103.0/24,193.22.248.0/24,193.23.52.0/24,193.24.240.0/22,193.25.162.0/23,193.26.14.0/24,193.28.250.0/24,193.29.55.0/24,193.30.228.0/22,193.41.64.0/22,193.41.182.0/23,193.41.188.0/22,193.41.206.0/24,193.43.26.0/24,193.68.0.0/19,193.68.96.0/19,193.68.128.0/21,193.68.142.0/23,193.68.144.0/20,193.68.160.0/19,193.68.192.0/18,193.108.24.0/24,193.108.32.0/23,193.109.54.0/23,193.110.82.0/24,193.110.159.0/24,193.110.216.0/21,193.111.89.0/24,193.111.194.0/23,193.138.67.0/24,193.151.20.0/22,193.151.80.0/22,193.178.152.0/23,193.178.166.0/24,193.178.222.0/24,193.193.162.0/23,193.193.164.0/24,193.193.182.0/24,193.194.140.0/23,193.194.156.0/24,193.200.14.0/23,193.201.114.0/23,193.201.172.0/24,193.254.29.0/24,194.8.53.0/24,194.8.60.0/24,194.12.224.0/19,194.54.140.0/22,194.54.144.0/22,194.63.136.0/22,194.141.0.0/16,194.145.63.0/24,194.145.160.0/22,194.146.232.0/22,194.150.116.0/22,194.150.180.0/23,194.153.145.0/24,194.246.110.0/23,195.22.146.0/23,195.24.32.0/19,195.24.88.0/21,195.34.96.0/19,195.39.198.0/23,195.39.212.0/23,195.47.193.0/24,195.62.22.0/23,195.68.200.0/23,195.68.214.0/23,195.69.108.0/22,195.69.120.0/22,195.69.164.0/22,195.72.112.0/24,195.85.215.0/24,195.96.224.0/19,195.128.224.0/23,195.138.128.0/19,195.149.248.0/21,195.177.218.0/23,195.177.248.0/23,195.212.63.0/24,195.214.248.0/21,195.225.252.0/22,195.230.0.0/19,195.234.84.0/22,195.234.236.0/22,195.242.106.0/23,195.242.126.0/24,195.242.240.0/22,212.5.128.0/19,212.7.192.0/19,212.21.128.0/19,212.36.0.0/19,212.39.64.0/19,212.50.0.0/19,212.56.0.0/19,212.72.192.0/19,212.73.128.0/19,212.91.160.0/19,212.95.160.0/19,212.104.96.0/19,212.116.128.0/19,212.122.160.0/19,212.124.64.0/20,212.124.80.0/22,212.124.84.0/23,212.124.87.0/24,212.124.88.0/21,213.16.32.0/19,213.91.128.0/17,213.130.64.0/19,213.137.32.0/22,213.137.38.0/23,213.137.40.0/21,213.137.48.0/20,213.145.96.0/19,213.167.0.0/21,213.167.8.0/24,213.169.32.0/19,213.174.0.0/19,213.191.192.0/19,213.208.10.0/23,213.222.32.0/19,213.226.0.0/19,213.226.33.0/24,213.226.34.0/23,213.226.36.0/22,213.226.40.0/24,213.226.48.0/21,213.226.56.0/24,213.226.60.0/22,213.240.192.0/18,217.9.224.0/20,217.10.240.0/20,217.18.240.0/20,217.30.208.0/20,217.75.128.0/21,217.75.136.0/23,217.75.138.0/24,217.75.140.0/22,217.75.144.0/20,217.79.32.0/20,217.79.64.0/19,217.145.80.0/20,217.145.160.0/20,217.174.144.0/20,217.197.128.0/20 do {
/ip firewall mangle add action=passthrough flow=abu mark-flow=peer_up disabled=no dst-address=$i
}
/ip firewall mangle add action=passthrough flow=abu mark-flow=inter_up disabled=no