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ESH(4)			 BSD Kernel Interfaces Manual			ESH(4)

NAME
     esh — RoadRunner-based HIPPI interfaces device driver

SYNOPSIS
     esh* at pci? dev ? function ?

DESCRIPTION
     The esh device driver supports the Essential Communications RoadRunner-
     based HIPPI interfaces.  With some modifications, the driver could be
     made to support the Gigabit Ethernet card based on the same chip.

     The driver supports both a normal network interface and a raw HIPPI Fram‐
     ing Protocol (HIPPI-FP) device.  The HIPPI-FP interface is accessed via
     the /dev/eshN/ulpN set of devices.	 There are 255 available Upper Layer
     Protocols in FP;  these are selectable via the various device entries.

     HIPPI is an 800-megabit/sec networking technology which supports
     extremely large packet sizes.  In order to efficiently use this network,
     the kernel should be configured with extra mbufs, and the default socket
     buffer size should be increased to at least 192KB, regardless of the
     expected bandwidth-delay product of the network.

     HIPPI ARP is not widely used, and the NetBSD stack does not support it
     (yet).  In order to define the mappings between IP addresses and ifields
     (the HIPPI MAC addresses), the administrator must make link-layer entries
     in the routing table using the route(8) command:

	   route add -interface 129.99.154.101 -llinfo -link esh0:3.0.0.65

MEDIA SELECTION
     Media selection is not yet supported for this device.

SEE ALSO
     intro(4), pci(4), eshconfig(8), ifconfig(8), route(8)

BUGS
     The card must be tuned for proper and efficient DMA operation.  The
     appropriate values vary based on the system.  The eshconfig(8) program is
     used for this.

BSD			       January 28, 1998				   BSD

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