How are packets coded on DSL lines?
====================================

Basically the coding is based on RFC1483.
The different formats vary in their LLC/SNAP-header:

1) IPoA
  +----------+
  !    IP    !
  +----------+
  ! LLC/SNAP ! <-- AAAA03 0000000800
  +----------+
  ! ATM/AAL5 !
  +----------+
  !   DSL    !
  +----------+

2) PPPoA (RFC2364)
  +----------+
  !   PPP    !
  +----------+
  ! LLC/SNAP ! <-- FEFE03 CF
  +----------+
  ! ATM/AAL5 !
  +----------+
  !   DSL    !
  +----------+

3) PPPoE (RFC2516)
  +----------+
  !   PPP    !
  +----------+
  ! Ethernet !  Ethertype: H'8863 or H'8864
  +----------+
  ! LLC/SNAP ! <-- AAAA03 0080C200010000
  +----------+
  ! ATM/AAL5 !
  +----------+
  !   DSL    !
  +----------+

4) Other protocols on Ethernet (DHCP, IP...)
  +----------+
  ! IP/DHCP  !
  +----------+
  ! Ethernet !  Ethertype: H'0800
  +----------+
  ! LLC/SNAP ! <-- AAAA03 0080C200010000
  +----------+
  ! ATM/AAL5 !
  +----------+
  !   DSL    !
  +----------+



-------------------S E C U R I T Y --------------
* WPA uses 802.1X
* WPA2 uses 802.11i