/interface pptp-client
add add-default-route=yes connect-to=tl1.webhop.net disabled=no name=pptp-out1 password=zz user=aa
add add-default-route=yes connect-to=tl2.webhop.net name=pptp-out2 password=zz user=aa

/ip firewall nat
add action=masquerade chain=srcnat out-interface=pptp-out1
add action=masquerade chain=srcnat out-interface=pptp-out2

/system script
add name=s1 owner=admin policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive source=\
    ":if ([/interface get [find name=\"pptp-out1\"] running]=true) do={interface disable pptp-out2}\r\
    \n"
add name=s2 owner=admin policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive source=":if ([/interface\
    \_get [find name=\"pptp-out1\"] running]=!true) do={\r\
    \n    :if ([/interface get [find name=\"pptp-out2\"] running]=!true) do={\r\
    \n         interface enable pptp-out2\r\
    \n    }\r\
    \n}"
add name=m owner=admin policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive source=\
    ":if ([/interface get [find name=\"ppp-out1\"] running]=!true) do={/system reboot}"


/system scheduler
add interval=5s name=s1 on-event=s1 policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive start-time=\
    startup
add interval=5s name=s2 on-event=s2 policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive start-time=\
    startup
add interval=30s name=m on-event=m policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive start-time=\
    startup