Work in progress

Pre-Proxy filtering:

Access-Request
      User-Name =* ANY,
      Reply-Message =* ANY,
      Service-Type := 'Authenticate-Only',
      State =* ANY,
      Class =* ANY,
      Message-Authenticator =* ANY,
      Calling-Station-ID =* ANY,
      Proxy-State =* ANY,
      EAP-Message =* ANY,
      MS-MPPE-Send-Key =* ANY,
      MS-MPPE-Recv-Key =* ANY,
      Fall-Through = yes
      Chargeable-User-Identity =* ANY,
      Called-Station-ID =* ANY,
      NAS-IP-Address =* ANY,
      NAS-Identifier =* ANY,
      NAS-Port-Type =* ANY,
      NAS-Port-ID =* ANY,
      Acct-Session-Id =* ANY,
      Connect-Info =* ANY

Post-Proxy:

Access-Accept
      User-Name =* ANY,
      Reply-Message =* ANY,
      State =* ANY,
      Class =* ANY,
      Message-Authenticator =* ANY,
      Calling-Station-ID =* ANY,
      Proxy-State =* ANY,
      EAP-Message =* ANY,
      MS-MPPE-Send-Key =* ANY,
      MS-MPPE-Recv-Key =* ANY,
      Fall-Through = yes
      Chargeable-User-Identity =* ANY