Openbsd as gateway Problem Post: 302153010

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LEARN ABOUT FREEBSD

ntb_hw

NTB(4)							   BSD Kernel Interfaces Manual 						    NTB(4)

NAME

     ntb, ntb_hw, if_ntb -- Intel(R) Non-Transparent Bridge driver

SYNOPSIS

     To compile this driver into your kernel, place the following lines in your kernel configuration file:

	   device ntb_hw
	   device if_ntb

     Or, to load the driver as a module at boot, place the following line in loader.conf(5):

	   if_ntb_load="YES"

DESCRIPTION

     The ntb driver provides support for the Non-Transparent Bridge (NTB) in the Intel S1200, Xeon E3 and Xeon E5 processor families.

     The NTB allows you to connect two computer systems using a PCI-e link if they have the correct equipment and connectors.

CONFIGURATION

     The NTB memory windows need to be configured by the BIOS.	If your BIOS allows you to set their size, you should set the size of both memory
     windows to 1 MiB.	This needs to be done on both systems.

     Each system needs to have a different IP address assigned.  The MAC address is randomly generated.  Also for maximum performance, the MTU
     should be set to 16 kiB.  This can be done by adding the line below to rc.conf(5):

	   ifconfig_ntb0="inet 192.168.1.10 netmask 255.255.255.0 mtu 16384"

     And on the second system :

	   ifconfig_ntb0="inet 192.168.1.11 netmask 255.255.255.0 mtu 16384"

     If you are using the UDP protocol, you may want to increase the net.inet.udp.maxdgram sysctl(8) variable.

SEE ALSO

     rc.conf(5), sysctl(8)

AUTHORS

     The ntb driver was developed by Intel and originally written by Carl Delsey <carl@FreeBSD.org>.

BUGS

     If the driver is unloaded, it cannot be reloaded without a system reboot.

     The network support is limited.  It isn't fully configurable yet.	It also isn't integrated into netgraph(4) or bpf(4).

     NTB to Root Port mode is not yet supported.

     There is no way to protect your system from malicious behavior on the other system once the link is brought up.  Anyone with root or kernel
     access on the other system can read or write to any location on your system.  In other words, only connect two systems that completely trust
     each other.

BSD
								   Apr 11, 2013 							       BSD

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