bagi rekan rekan yg ingin melakukan pengecekan proxy dengan melihat service squid dan test dari mikrotik berikut caranya di mesin proxy sudah ada web yg berjalan dan buat file test.txt di root webnya, terserah mau isi apa, tapi saran saya kasih text seminim mungkin di file tersebut

selanjutnya mari kita buat script beikut :

/system clock manual
set dst-delta=+07:00 dst-end="jan/01/1970 00:00:00" dst-start=\
"jan/01/1970 00:00:00" time-zone=+07:00
/system ntp client
set enabled=yes mode=unicast primary-ntp=202.134.1.10 secondary-ntp=\
152.118.24.8

/system scheduler
add comment="" disabled=no interval=10s name=Check_Proxy on-event=PROXY \
policy=reboot,read,write,policy,test,password,sniff,sensitive start-date=\
jan/01/1970 start-time=00:00:00
/system script
add name=Check-proxy policy=\
ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive source="\
{\r\
\n:local checkpage \"test.txt\";\r\
\n:local found \"0\" ;\r\
\n:foreach i in=[/file find] do={\r\
\n:local filename [/file get \$i name];\r\
\n:if ( \$filename = \$checkpage) do={ \r\
\n:set found \"1\" ; \r\
\n:log info \"found\"; \r\
\n}\r\
\n}\r\
\n:log warning \"\$found\";\r\
\n:if ( \$found = \"0\" ) do={ \r\
\n:log warning \"Disable rule, service down\"; \r\
\n/ip fire nat dis 3 ; \r\
\n/ip fire mang dis 14; \r\
\n} else={ \r\
\n:log info \"Enable rule, service up\"; \r\
\n/ip fire nat en 3; \r\
\n/ip fire mang en 14; \r\
\n}\r\
\n/file remove \$checkpage;\r\
\n}\r\
\n"
add name=Download policy=\
ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive source="\
{\r\
\n/tool fetch url=\"http://192.168.99.2/test.txt\" mode=http port=3128\r\
\n}"
add name=PROXY policy=\
ftp,reboot,read,write,policy,test,winbox,password,sniff,sensitive source="\
{\r\
\n/system script run Check-proxy;\r\
\n:delay delay-time=2\r\
\n/system script run Download \r\
\n}\r\
\n"

untuk yg saya bold dan warna merah itu sesuaikan dengan nat atau mangle yg ingin anda disable atau enable Source : http://www.forummikrotik.com/showthread.php/20546-Check-proxy-dari-mikrotik-%28melihat-service-squid%29