Spilt tunnel to bypass poor peer using a VPN

The following code form this post on MyBroadband creates a slit tunnel that mitigates a poor peer or cross connection by directing traffic over a remote VPN head end.

#Address list
/ip firewall address-list
add address=34.104.116.0/22 list=gcc_eu
add address=34.116.128.0/17 list=gcc_eu
add address=34.118.0.0/17 list=gcc_eu
add address=34.124.52.0/22 list=gcc_eu
add address=34.88.0.0/16 list=gcc_eu
add address=34.104.96.0/21 list=gcc_eu
add address=34.124.32.0/21 list=gcc_eu
add address=35.203.232.0/21 list=gcc_eu
add address=35.217.0.0/18 list=gcc_eu
add address=35.220.26.0/24 list=gcc_eu
add address=35.228.0.0/16 list=gcc_eu
add address=35.242.26.0/24 list=gcc_eu
add address=8.34.208.0/23 list=gcc_eu
add address=8.34.211.0/24 list=gcc_eu
add address=8.34.220.0/22 list=gcc_eu
add address=23.251.128.0/20 list=gcc_eu
add address=34.76.0.0/14 list=gcc_eu
add address=34.140.0.0/16 list=gcc_eu
add address=35.187.0.0/17 list=gcc_eu
add address=35.187.160.0/19 list=gcc_eu
add address=35.189.192.0/18 list=gcc_eu
add address=35.190.192.0/19 list=gcc_eu
add address=35.195.0.0/16 list=gcc_eu
add address=35.205.0.0/16 list=gcc_eu
add address=35.206.128.0/18 list=gcc_eu
add address=35.210.0.0/16 list=gcc_eu
add address=35.220.96.0/19 list=gcc_eu
add address=35.233.0.0/17 list=gcc_eu
add address=35.240.0.0/17 list=gcc_eu
add address=35.241.128.0/17 list=gcc_eu
add address=35.242.64.0/19 list=gcc_eu
add address=104.155.0.0/17 list=gcc_eu
add address=104.199.0.0/18 list=gcc_eu
add address=104.199.66.0/23 list=gcc_eu
add address=104.199.68.0/22 list=gcc_eu
add address=104.199.72.0/21 list=gcc_eu
add address=104.199.80.0/20 list=gcc_eu
add address=104.199.96.0/20 list=gcc_eu
add address=130.211.48.0/20 list=gcc_eu
add address=130.211.64.0/19 list=gcc_eu
add address=130.211.96.0/20 list=gcc_eu
add address=146.148.2.0/23 list=gcc_eu
add address=146.148.4.0/22 list=gcc_eu
add address=146.148.8.0/21 list=gcc_eu
add address=146.148.16.0/20 list=gcc_eu
add address=146.148.112.0/20 list=gcc_eu
add address=192.158.28.0/22 list=gcc_eu
add address=34.89.0.0/17 list=gcc_eu
add address=34.105.128.0/17 list=gcc_eu
add address=34.142.0.0/17 list=gcc_eu
add address=34.147.128.0/17 list=gcc_eu
add address=35.189.64.0/18 list=gcc_eu
add address=35.197.192.0/18 list=gcc_eu
add address=35.203.210.0/23 list=gcc_eu
add address=35.203.212.0/22 list=gcc_eu
add address=35.203.216.0/22 list=gcc_eu
add address=35.214.0.0/17 list=gcc_eu
add address=35.220.20.0/22 list=gcc_eu
add address=35.230.128.0/19 list=gcc_eu
add address=35.234.128.0/19 list=gcc_eu
add address=35.235.48.0/20 list=gcc_eu
add address=35.242.20.0/22 list=gcc_eu
add address=35.242.128.0/18 list=gcc_eu
add address=35.246.0.0/17 list=gcc_eu
add address=34.89.128.0/17 list=gcc_eu
add address=34.104.112.0/23 list=gcc_eu
add address=34.107.0.0/17 list=gcc_eu
add address=34.124.48.0/23 list=gcc_eu
add address=34.141.0.0/17 list=gcc_eu
add address=35.198.64.0/18 list=gcc_eu
add address=35.198.128.0/18 list=gcc_eu
add address=35.207.64.0/18 list=gcc_eu
add address=35.207.128.0/18 list=gcc_eu
add address=35.220.18.0/23 list=gcc_eu
add address=35.234.64.0/18 list=gcc_eu
add address=35.235.32.0/20 list=gcc_eu
add address=35.242.18.0/23 list=gcc_eu
add address=35.242.192.0/18 list=gcc_eu
add address=35.246.128.0/17 list=gcc_eu
add address=34.90.0.0/15 list=gcc_eu
add address=34.104.126.0/23 list=gcc_eu
add address=34.124.62.0/23 list=gcc_eu
add address=34.141.128.0/17 list=gcc_eu
add address=34.147.0.0/17 list=gcc_eu
add address=35.204.0.0/16 list=gcc_eu
add address=35.214.128.0/17 list=gcc_eu
add address=35.220.16.0/23 list=gcc_eu
add address=35.234.160.0/20 list=gcc_eu
add address=35.242.16.0/23 list=gcc_eu
add address=34.65.0.0/16 list=gcc_eu
add address=34.104.110.0/23 list=gcc_eu
add address=34.124.46.0/23 list=gcc_eu
add address=35.216.128.0/17 list=gcc_eu
add address=35.220.44.0/24 list=gcc_eu
add address=35.235.216.0/21 list=gcc_eu
add address=35.242.44.0/24 list=gcc_eu

#Routing Table
/routing table
add disabled=no fib name=GCC

#Mangle
/ip firewall mangle
add action=mark-routing chain=prerouting comment="Google Cloud - EU" dst-address-list=gcc_eu new-routing-mark=GCC passthrough=no

#Route
/ip route
add comment="Google Cloud - EU - CISP VPN" disabled=no distance=1 \
    dst-address=0.0.0.0/0 gateway=cisp-vpn pref-src="" routing-table=GCC \
    scope=30 suppress-hw-offload=no target-scope=10
 
#NAT
add action=masquerade chain=srcnat comment="NAT - CISP VPN" out-interface=cisp-vpn

#PPP Profile
/ppp profile
add change-tcp-mss=yes idle-timeout=3s name=cisp-vpn use-encryption=yes

#VPN Interface
/interface sstp-client
add comment="Cool Ideas - UK VPN" connect-to=ukvpn.cisp.co.za dial-on-demand=\
    yes disabled=no keepalive-timeout=10 max-mtu=1460 name=cisp-vpn profile=\
    cisp-vpn tls-version=only-1.2 user=test password=test
 
#Firewall - use these firewall rules at your own risk
/ip firewall filter
add action=accept chain=forward comment="Allow established & related - Forward" connection-state=established,related
add action=accept chain=input comment="Allow established & related - Input" connection-state=established,related
add action=drop chain=input comment="Drop All - Input - CISP VPN" in-interface=cisp-vpn
add action=drop chain=forward comment="Drop All - Forward - CISP VPN" in-interface=cisp-vpn