-d, --data
(HTTP) Sends the specified data in a POST request to the HTTP server, in the same way that a browser does when a user has filled in an HTML form and presses the submit button. This will cause curl to pass the data to
the server using the content-type application/x-www-form-urlencoded. Compare to -F, --form.
-d, --data is the same as --data-ascii. To post data purely binary, you should instead use the --data-binary option. To URL-encode the value of a form field you may use --data-urlencode.
If any of these options is used more than once on the same command line, the data pieces specified will be merged together with a separating &-symbol. Thus, using '-d name=daniel -d skill=lousy' would generate a post
chunk that looks like 'name=daniel&skill=lousy'.
If you start the data with the letter @, the rest should be a file name to read the data from, or - if you want curl to read the data from stdin. The contents of the file must already be URL-encoded. Multiple files
can also be specified. Posting data from a file named 'foobar' would thus be done with --data @foobar.
Сорри не увидел что pptpd.
pptpd работает через gre. 2 копии не запустить.
Есть несколько вариантов:
Eсли везде IP адреса статические, то использовать IP-IP туннели.
Если статики нет, то OpenVPN.
И если всё таки хочется pptp, то поднимять 2 linux или vz контейнера и на них уже поднимать pptpd