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.. _Squidguard: http://www.squidguard.org/
.. _TFTP: https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol
.. _`arbitrary extension commands`: http://net-snmp.sourceforge.net/docs/man/snmpd.conf.html#lbAZ
+.. _`accel-ppp`: https://accel-ppp.org/
+.. _`Secure Socket Tunneling Protocol`: https://en.wikipedia.org/wiki/Secure_Socket_Tunneling_Protocol