1.\" Copyright (c) 1996-1999 Whistle Communications, Inc. 2.\" All rights reserved. 3.\" 4.\" Subject to the following obligations and disclaimer of warranty, use and 5.\" redistribution of this software, in source or object code forms, with or 6.\" without modifications are expressly permitted by Whistle Communications; 7.\" provided, however, that: 8.\" 1. Any and all reproductions of the source or object code must include the 9.\" copyright notice above and the following disclaimer of warranties; and 10.\" 2. No rights are granted, in any manner or form, to use Whistle 11.\" Communications, Inc. trademarks, including the mark "WHISTLE 12.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as 13.\" such appears in the above copyright notice or in the software. 14.\" 15.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 16.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 17.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 18.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 19.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 20.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 21.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 22.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 23.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 24.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 25.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 26.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 27.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 31.\" OF SUCH DAMAGE. 32.\" 33.\" Author: Archie Cobbs <archie@FreeBSD.org> 34.\" 35.\" $FreeBSD$ 36.\" $Whistle: ng_cisco.8,v 1.5 1999/01/25 23:46:26 archie Exp $ 37.\" 38.Dd January 19, 1999 39.Dt NG_CISCO 4 40.Os 41.Sh NAME 42.Nm ng_cisco 43.Nd Cisco HDLC protocol netgraph node type 44.Sh SYNOPSIS 45.In sys/types.h 46.In netinet/in.h 47.In netgraph/ng_cisco.h 48.Sh DESCRIPTION 49The 50.Nm cisco 51node type performs encapsulation and de-encapsulation of packets 52using the Cisco HDLC protocol. 53This is a fairly simple 54protocol for the transmission of packets across 55high speed synchronous lines. 56Each packet is prepended with 57an Ethertype, indicating the protocol. 58There is also a 59.Dq keep alive 60and an 61.Dq inquire 62capability. 63.Pp 64The 65.Dv downstream 66hook should connect to the synchronous line. 67On the other side 68of the node are the 69.Dv inet , 70.Dv inet6 , 71.Dv atalk , 72and 73.Dv ipx 74hooks, which transmit and receive raw IP, IPv6, AppleTalk, and IPX packets, 75respectively. 76Typically these hooks would connect to the corresponding 77hooks on an 78.Xr ng_iface 4 79type node. 80.Sh IP Configuration 81In order to function properly for IP traffic, the node must be informed 82of the local IP address and netmask setting. 83This is because the protocol 84includes an 85.Dq inquire 86packet which we must be prepared to answer. 87There are two ways to accomplish this, manually and automatically. 88.Pp 89Whenever such an inquire packet is received, the node sends a 90.Dv NGM_CISCO_GET_IPADDR 91control message to the peer node connected to the 92.Dv inet 93hook (if any). 94If the peer responds, then that response is used. 95This is the automatic method. 96.Pp 97If the peer does not respond, the node falls back on its cached value 98for the IP address and netmask. 99This cached value can be set at any time 100with a 101.Dv NGM_CISCO_SET_IPADDR 102message, and this is the manual method. 103.Pp 104If the 105.Dv inet 106hook is connected to the 107.Dv inet 108hook of an 109.Xr ng_iface 4 110node, as is usually the case, then configuration is automatic as the 111.Xr ng_iface 4 112understands the 113.Dv NGM_CISCO_GET_IPADDR 114message. 115.Sh HOOKS 116This node type supports the following hooks: 117.Bl -tag -width ".Va downstream" 118.It Va downstream 119The connection to the synchronous line. 120.It Va inet 121IP hook. 122.It Va inet6 123IPv6 hook. 124.It Va atalk 125AppleTalk hook. 126.It Va ipx 127IPX hook. 128.El 129.Sh CONTROL MESSAGES 130This node type supports the generic control messages, plus the following: 131.Bl -tag -width foo 132.It Dv NGM_CISCO_SET_IPADDR Pq Ic setipaddr 133This command takes an array of two 134.Dv "struct in_addr" 135arguments. 136The first is the IP address of the corresponding interface 137and the second is the netmask. 138.It Dv NGM_CISCO_GET_IPADDR Pq Ic getipaddr 139This command returns the IP configuration in the same format used by 140.Dv NGM_CISCO_SET_IPADDR . 141This command is also 142.Em sent 143by this node type to the 144.Dv inet 145peer whenever an IP address inquiry packet is received. 146.It Dv NGM_CISCO_GET_STATUS Pq Ic getstats 147Returns a 148.Dv "struct ngciscostat" : 149.Bd -literal -offset 4n 150struct ngciscostat { 151 uint32_t seqRetries; /* # unack'd retries */ 152 uint32_t keepAlivePeriod; /* in seconds */ 153}; 154.Ed 155.El 156.Sh SHUTDOWN 157This node shuts down upon receipt of a 158.Dv NGM_SHUTDOWN 159control message, or when all hooks have been disconnected. 160.Sh SEE ALSO 161.Xr netgraph 4 , 162.Xr ng_iface 4 , 163.Xr ngctl 8 164.Rs 165.%A D. Perkins 166.%T "Requirements for an Internet Standard Point-to-Point Protocol" 167.%O RFC 1547 168.Re 169.Sh LEGAL 170.Tn Cisco 171is a trademark of Cisco Systems, Inc. 172.Sh HISTORY 173The 174.Nm 175node type was implemented in 176.Fx 4.0 . 177.Sh AUTHORS 178.An Julian Elischer Aq Mt julian@FreeBSD.org 179.An Archie Cobbs Aq Mt archie@FreeBSD.org 180.Sh BUGS 181Not all of the functionality has been implemented. 182For example, 183the node does not support querying the remote end for its IP address 184and netmask. 185