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NetWare Link/PPP is intended as an unreliable, point-to-point data link, as opposed to a sequenced multipoint data link. Therefore, it uses constant values for the HDLC Address (All Stations Address) and Control (Unnumbered Information) fields. This is consistent with HDLC framing, but it does add a level of unneeded overhead when low-bandwidth data links are used.
To overcome this inefficiency, NetWare Link/PPP provides the option of generating or eliminating (through compression) the HDLC address and control fields for each data link. When successfully negotiated between peers, these constant HDLC header fields can be eliminated from subsequent data-link exchanges. Configuration of this option is provided on a per-port basis.
The address and control compression field (PPP Header Compression field in NIASCFG) displays the option's configured state (Enabled or Disabled ); the default is Disabled . Note that enabling this option results in a negotiation attempt with the remote peer. It does not guarantee that compression is actually used; that is determined by the peer-to-peer negotiation process at link establishment time. However, you can validate whether compression is used by examining the PPP negotiated parameters in the PPP console (PPPCON.NLM).
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