NAME

DDP − AppleTalk Datagram Delivery Protocol

DESCRIPTION

The DDP interface provides access to AppleTalk protocols.  DDP is the basic socket to socket delivery mechanism common to all Apple’s protocol stacks.  Ethernet packets with the special type number 0x809B are interpreted and generated.  An Ethernet/AppleTalk gateway is used to access the 230 Kb/s Apple Personal Network. 

SEE ALSO

ddpstat(8c)
Inside AppleTalk

BUGS

Some versions of the Apple ImageWriter II don’t work with DDP checksum enabled. 
 
To turn off DDP checksum, patch the kernel using adb:
 

adb -k -w /vmunix /dev/mem
ddp_dosum ? W 0
/ W 0
$q

Sun Release 4.0  —  Last change: 23 November 1987