====== ppp ======

===== pptp client =====

To connect using legacy pptp:

<code bash>sudo apt install pptp-linux</code>

Issue:
<code>
MPPE required, but MS-CHAP[v2] nor EAP-TLS auth are performed.
sent [LCP TermReq id=0x3 "MPPE required but not available"]
rcvd [LCP EchoReq id=0x0 magic=0x5dd9b546]
rcvd [LCP TermReq id=0x3 "peer refused to authenticate"]
</code>

Solution:
<file /etc/ppp/chap-secrets>
# client    server    secret    IP address
john      provider   "secret"   *
</file>