NAME

dl − leased line interface

SYNOPSIS

device isdn[0-3] at ap0 priority 120 (for APbus machine)
device isdn0 at iop0 priority 120 (for 2 CPU machine)
device isdn0 at hb0  priority 120 (for 1 CPU machine)

DESCRIPTION

The dl interface provides access to a point-to-point leased line up to 64 kbps.  To connect to the line, you need a synchronous modem or a DSU(Digital Service Uint). 

The host’s Internet address is specified at boot time with an SIOCSIFADDR ioctl.  The destination’s Internet address is specified with an SIOCSIFDSTADDR ioctl. 

The dl interface provides reliable communication using LAPB(Link Access Protocol Balanced) as a data link layer protocol. 

NWB-236/236LT/5831 supports several access methods to wide area networks.  The dl represents one of these possibilities. 

SEE ALSO

intro(4N), inet(4F), is(4), dx(4), isdn.conf(5), isdnload(8), ifconfig(8C), RFC1144

DIAGNOSTICS

A variety of messages may be returned from the interface and reported via the kernel logging facility of syslogd(8). 

BUGS

Only the Internet family of protocols is supported. 

NEWS-OSRelease 4.2.1R