From 2d7475f455a9bdb4b588f6b57a69ce0d6f09b905 Mon Sep 17 00:00:00 2001 From: charnier Date: Tue, 3 Feb 1998 07:30:22 +0000 Subject: Convert to mdoc. Header -> Id. Typo. --- libexec/bootpd/bootpd.8 | 359 +++++++++++++++++++------------------- libexec/bootpd/bootptab.5 | 430 ++++++++++++++++++++++++---------------------- 2 files changed, 394 insertions(+), 395 deletions(-) (limited to 'libexec/bootpd') diff --git a/libexec/bootpd/bootpd.8 b/libexec/bootpd/bootpd.8 index ff979d5..a8cd05e 100644 --- a/libexec/bootpd/bootpd.8 +++ b/libexec/bootpd/bootpd.8 @@ -1,305 +1,290 @@ .\" Copyright (c) 1988, 1989, 1991 Carnegie Mellon University .\" -.\" $Header: /home/ncvs/src/libexec/bootpd/bootpd.8,v 1.6 1997/08/24 18:21:34 joerg Exp $ +.\" $Id$ .\" -.TH BOOTPD 8 "November 06, 1993" "Carnegie Mellon University" -.SH NAME -bootpd, bootpgw \- Internet Boot Protocol server/gateway -.SH SYNOPSIS -.B bootpd -[ -.B \-i -.B \-s -.B \-t -timeout -.B \-d -level -.B \-c -chdir\-path -] -[ -.I bootptab -[ -.I dumpfile -] ] -.br -.B bootpgw -[ -.B \-i -.B \-s -.B \-t -timeout -.B \-d -level -] server -.SH DESCRIPTION -.I Bootpd +.Dd November 06, 1993 +.Dt BOOTPD 8 +.Os "Carnegie Mellon University" +.Sh NAME +.Nm bootpd , bootpgw +.Nd Internet Boot Protocol server/gateway +.Sh SYNOPSIS +.Nm bootpd +.Op Fl i +.Op Fl s +.Op Fl t Ar timeout +.Op Fl d Ar level +.Op Fl c Ar chdir-path +.Oo +.Ar bootptab +.Op Ar dumpfile +.Oc +.Nm bootpgw +.Op Fl i +.Op Fl s +.Op Fl t Ar timeout +.Op Fl d Ar level +.Ar server +.Sh DESCRIPTION +.Nm Bootpd implements an Internet Bootstrap Protocol (BOOTP) server as defined in RFC951, RFC1532, and RFC1533. -.I Bootpgw +.Nm Bootpgw implements a simple BOOTP gateway which can be used to forward requests and responses between clients on one subnet and a BOOTP server (i.e. -.IR bootpd ) +.Nm Ns ) on another subnet. While either -.I bootpd +.Nm or -.I bootpgw +.Nm bootpgw will forward BOOTREPLY packets, only -.I bootpgw +.Nm bootpgw will forward BOOTREQUEST packets. -.PP +.Pp One host on each network segment is normally configured to run either -.I bootpd +.Nm or -.I bootpgw +.Nm bootpgw from -.I inetd +.Xr inetd 8 by including one of the following lines in the file -.IR /etc/inetd.conf : -.IP -bootps dgram udp wait root /usr/libexec/bootpd bootpd /etc/bootptab -.br -bootps dgram udp wait root /usr/libexec/bootpgw bootpgw server -.PP +.Pa /etc/inetd.conf : +.Pp +.Dl bootps dgram udp wait root /usr/libexec/bootpd bootpd /etc/bootptab +.Dl bootps dgram udp wait root /usr/libexec/bootpgw bootpgw server +.Pp This mode of operation is referred to as "inetd mode" and causes -.I bootpd +.Nm (or -.IR bootpgw ) +.Nm bootpgw ) to be started only when a boot request arrives. If it does not receive another packet within fifteen minutes of the last one it received, it will exit to conserve system resources. The -.B \-t +.Fl t option controls this timeout (see OPTIONS). -.PP +.Pp It is also possible to run -.I bootpd +.Nm (or -.IR bootpgw ) +.Nm bootpgw ) in "standalone mode" (without -.IR inetd ) +.Xr inetd 8 ) by simply invoking it from a shell like any other regular command. Standalone mode is particularly useful when -.I bootpd +.Nm is used with a large configuration database, where the start up delay might otherwise prevent timely response to client requests. (Automatic start up in standalone mode can be done by invoking -.I bootpd +.Nm from within -.IR /etc/rc.local , +.Pa /etc/rc.local , for example.) Standalone mode is less useful for -.I bootpgw +.Nm bootpgw which has very little start up delay because it does not read a configuration file. -.PP +.Pp Either program automatically detects whether it was invoked from inetd or from a shell and automatically selects the appropriate mode. The -.B \-s +.Fl s or -.B \-i +.Fl i option may be used to force standalone or inetd mode respectively (see OPTIONS). -.SH OPTIONS -.TP -.BI \-t \ timeout -Specifies the -.I timeout +.Sh OPTIONS +The following options are available: +.Bl -tag -width indent +.It Fl t Ar timeout +Specify the +.Ar timeout value (in minutes) that a -.I bootpd +.Nm or -.I bootpgw +.Nm bootpgw process will wait for a BOOTP packet before exiting. If no packets are recieved for -.I timeout +.Ar timeout minutes, then the program will exit. A timeout value of zero means "run forever". In standalone mode, this option is forced to zero. -.TP -.BI \-d \ debug\-level -Sets the -.I debug\-level +.It Fl d Ar debug-level +Set the +.Ar debug-level variable that controls the amount of debugging messages generated. -For example, -d4 or -d 4 will set the debugging level to 4. +For example, +.Fl d Ns 4 +or +.Fl d +4 will set the debugging level to 4. For compatibility with older versions of -.IR bootpd , -omitting the numeric parameter (i.e. just -d) will -simply increment the debug level by one. -.TP -.BI \-c \ chdir\-path -Sets the current directory used by -.I bootpd +.Nm Ns , +omitting the numeric parameter (i.e. just +.Fl d Ns ) +will simply increment the debug level by one. +.It Fl c Ar chdir-path +Set the current directory used by +.Nm while checking the existence and size of client boot files. This is useful when client boot files are specified as relative pathnames, and -.I bootpd +.Nm needs to use the same current directory as the TFTP server -(typically /tftpboot). This option is not recoginzed by -.IR bootpgw . -.TP -.B \-i +(typically +.Pa /tftpboot Ns ). +This option is not recognized by +.Nm bootpgw . +.It Fl i Force inetd mode. This option is obsolete, but remains for compatibility with older versions of -.IR bootpd . -.TP -.B \-s +.Nm Ns . +.It Fl s Force standalone mode. This option is obsolete, but remains for compatibility with older versions of -.IR bootpd . -.TP -.I bootptab -Specifies the name of the configuration file from which -.I bootpd +.Nm Ns . +.It Ar bootptab +Specify the name of the configuration file from which +.Nm loads its database of known clients and client options -.RI ( bootpd +.Pf ( Nm bootpd only). -.TP -.I dumpfile -Specifies the name of the file that -.I bootpd +.It Ar dumpfile +Specify the name of the file that +.Nm will dump its internal database into when it receives a SIGUSR1 signal -.RI ( bootpd -only). This option is only recognized if -.I bootpd +.Pf ( Nm bootpd +only). This option is only recognized if +.Nm was compiled with the -DDEBUG flag. -.TP -.I server -Specifies the name of a BOOTP server to which -.I bootpgw +.It Ar server +Specify the name of a BOOTP server to which +.Nm bootpgw will forward all BOOTREQUEST packets it receives -.RI ( bootpgw +.Pf ( Nm bootpgw only). -.SH OPERATION -.PP +.El +.Sh OPERATION Both -.I bootpd +.Nm and -.I bootpgw +.Nm bootpgw operate similarly in that both listen for any packets sent to the -.I bootps +.Em bootps port, and both simply forward any BOOTREPLY packets. They differ in their handling of BOOTREQUEST packets. -.PP +.Pp When -.I bootpgw +.Nm bootpgw is started, it determines the address of a BOOTP server whose name is provided as a command line parameter. When -.I bootpgw +.Nm bootpgw receives a BOOTREQUEST packet, it sets the "gateway address" and "hop count" fields in the packet and forwards the packet to the BOOTP server at the address determined earlier. Requests are forwarded only if they indicate that the client has been waiting for at least three seconds. -.PP +.Pp When -.I bootpd +.Nm is started it reads a configuration file, (normally -.IR /etc/bootptab ) +.Pa /etc/bootptab Ns ) that initializes the internal database of known clients and client options. This internal database is reloaded from the configuration file when -.I bootpd +.Nm receives a hangup signal (SIGHUP) or when it discovers that the configuration file has changed. -.PP +.Pp When -.I bootpd +.Nm receives a BOOTREQUEST packet, it .\" checks the modification time of the .\" configuration file and reloads the database if necessary. Then it looks for a database entry matching the client request. If the client is known, -.I bootpd +.Nm composes a BOOTREPLY packet using the database entry found above, and sends the reply to the client (possibly using a gateway). If the client is unknown, the request is discarded (with a notice if debug > 0). -.PP +.Pp If -.I bootpd +.Nm is compiled with the -DDEBUG option, receipt of a SIGUSR1 signal causes it to dump its internal database to the file -.I /tmp/bootpd.dump +.Pa /tmp/bootpd.dump or the dumpfile specified as a command line parameter. -.PP +.Pp During initialization, both programs determine the UDP port numbers to be used by calling -.I getservbyname +.Xr getservbyname 3 (which nomally uses -.IR /etc/services). +.Pa /etc/services Ns ). Two service names (and port numbers) are used: -.IP -bootps \- BOOTP Server listening port -.br -bootpc \- BOOTP Client destination port -.LP -If the port numbers cannot -be determined using -.I getservbyname +.Pp +.Dl bootps BOOTP Server listening port +.Dl bootpc BOOTP Client destination port +.Pp +If the port numbers cannot be determined using +.Xr getservbyname 3 then the values default to bootps=67 and bootpc=68. -.SH FILES -.TP 20 -/etc/bootptab +.Sh FILES +.Bl -tag -width /tmp/bootpd.dump -compact +.It Pa /etc/bootptab Database file read by -.IR bootpd . -.TP -/tmp/bootpd.dump +.Nm Ns . +.It Pa /tmp/bootpd.dump Debugging dump file created by -.IR bootpd . -.TP -/etc/services +.Nm Ns . +.It Pa /etc/services Internet service numbers. -.TP -/tftpboot +.It Pa /tftpboot Current directory typically used by the TFTP server and -.IR bootpd . - -.SH BUGS +.Nm Ns . +.El +.Sh BUGS Individual host entries must not exceed 1024 characters. - -.SH CREDITS -.PP +.Sh CREDITS This distribution is currently maintained by -Walter L. Wimer . -.PP +.An Walter L. Wimer Aq walt+@cmu.edu . +.Pp The original BOOTP server was created by -Bill Croft at Stanford University in January 1986. -.PP +.An Bill Croft +at Stanford University in January 1986. +.Pp The current version of -.I bootpd -is primarily the work of David Kovar, -Drew D. Perkins, and Walter L. Wimer, +.Nm +is primarily the work of +.An David Kovar , +.An Drew D. Perkins , +and +.An Walter L. Wimer , at Carnegie Mellon University. -.TP -Enhancements and bug\-fixes have been contributed by: +.Pp +Enhancements and bug-fixes have been contributed by: +.Pp (in alphabetical order) -.br -Danny Backx -.br -John Brezak -.br -Frank da Cruz -.br -David R. Linn -.br -Jim McKim -.br -Gordon W. Ross -.br -Jason Zions -.SH "SEE ALSO" -.LP -bootptab(5), inetd(8), tftpd(8) -.LP +.Pp +.An Danny Backx Aq db@sunbim.be +.An John Brezak Aq brezak@ch.hp.com +.An Frank da Cruz Aq fdc@cc.columbia.edu +.An David R. Linn Aq drl@vuse.vanderbilt.edu +.An Jim McKim Aq mckim@lerc.nasa.gov +.An Gordon W. Ross Aq gwr@mc.com +.An Jason Zions Aq jazz@hal.com . +.Sh "SEE ALSO" +.Xr bootptab 5 , +.Xr inetd 8 , +.Xr tftpd 8 +.Pp DARPA Internet Request For Comments: -.TP 10 -RFC951 +.Bl -tag -width RFC1533 -compact +.It RFC951 Bootstrap Protocol -.TP 10 -RFC1532 +.It RFC1532 Clarifications and Extensions for the Bootstrap Protocol -.TP 10 -RFC1533 +.It RFC1533 DHCP Options and BOOTP Vendor Extensions +.El diff --git a/libexec/bootpd/bootptab.5 b/libexec/bootpd/bootptab.5 index c79116a..f36e7d6 100644 --- a/libexec/bootpd/bootptab.5 +++ b/libexec/bootpd/bootptab.5 @@ -1,346 +1,359 @@ .\" Copyright (c) 1988, 1989, 1991 Carnegie Mellon University .\" -.\" $Header: $ +.\" $Id$ .\" -.TH BOOTPTAB 5 "October 31, 1991" "Carnegie Mellon University" -.UC 6 - -.SH NAME -bootptab \- Internet Bootstrap Protocol server database -.SH DESCRIPTION +.Dd October 31, 1991 +.Dt BOOTPTAB 5 +.Os "Carnegie Mellon University" +.Sh NAME +.Nm bootptab +.Nd Internet Bootstrap Protocol server database +.Sh DESCRIPTION The -.I bootptab +.Nm file is the configuration database file for -.IR bootpd , +.Xr bootpd 8 , the Internet Bootstrap Protocol server. It's format is similar to that of -.IR termcap (5) +.Xr termcap 5 in which two-character case-sensitive tag symbols are used to represent host parameters. These parameter declarations are separated by colons (:), with a general format of: -.PP -.I " hostname:tg=value. . . :tg=value. . . :tg=value. . . ." -.PP +.Pp +.Dl "hostname:tg=value. . . :tg=value. . . :tg=value. . . ." +.Pp where -.I hostname +.Em hostname is the actual name of a bootp client (or a "dummy entry"), and -.I tg +.Em tg is a two-character tag symbol. Dummy entries have an invalid hostname (one with a "." as the first character) and are used to provide default values used by other entries via the -.B tc=.dummy-entry +.Em tc=.dummy-entry mechanism. Most tags must be followed by an equals-sign and a value as above. Some may also appear in a boolean form with no value (i.e. -.RI : tg :). +.Em :tg: Ns ). The currently recognized tags are: -.PP -.br - bf Bootfile -.br - bs Bootfile size in 512-octet blocks -.br - cs Cookie server address list -.br - df Merit dump file -.br - dn Domain name -.br - ds Domain name server address list -.br - ef Extension file -.br - gw Gateway address list -.br - ha Host hardware address -.br - hd Bootfile home directory -.br - hn Send client's hostname to client -.br - ht Host hardware type (see Assigned Numbers RFC) -.br - im Impress server address list -.br - ip Host IP address -.br - lg Log server address list -.br - lp LPR server address list -.br - ns IEN-116 name server address list -.br - nt NTP (time) Server (RFC 1129) -.br - ra Reply address override -.br - rl Resource location protocol server address list -.br - rp Root path to mount as root -.br - sa TFTP server address client should use -.br - sm Host subnet mask -.br - sw Swap server address -.br - tc Table continuation (points to similar "template" host entry) -.br - td TFTP root directory used by "secure" TFTP servers -.br - to Time offset in seconds from UTC -.br - ts Time server address list -.br - vm Vendor magic cookie selector -.br - yd YP (NIS) domain name -.br - ys YP (NIS) server address - -.PP +.Pp +.Bl -tag -width xxx -compact +.It bf +Bootfile +.It bs +Bootfile size in 512-octet blocks +.It cs +Cookie server address list +.It df +Merit dump file +.It dn +Domain name +.It ds +Domain name server address list +.It ef +Extension file +.It gw +Gateway address list +.It ha +Host hardware address +.It hd +Bootfile home directory +.It hn +Send client's hostname to client +.It ht +Host hardware type (see Assigned Numbers RFC) +.It im +Impress server address list +.It ip +Host IP address +.It lg +Log server address list +.It lp +LPR server address list +.It ns +IEN-116 name server address list +.It nt +NTP (time) Server (RFC 1129) +.It ra +Reply address override +.It rl +Resource location protocol server address list +.It rp +Root path to mount as root +.It sa +TFTP server address client should use +.It sm +Host subnet mask +.It sw +Swap server address +.It tc +Table continuation (points to similar "template" host entry) +.It td +TFTP root directory used by "secure" TFTP servers +.It to +Time offset in seconds from UTC +.It ts +Time server address list +.It vm +Vendor magic cookie selector +.It yd +YP (NIS) domain name +.It ys +YP (NIS) server address +.El +.Pp There is also a generic tag, -.RI T n , +.Pf T Em n , where -.I n +.Em n is an RFC1084 vendor field tag number. Thus it is possible to immediately take advantage of future extensions to RFC1084 without being forced to modify -.I bootpd +.Nm bootpd first. Generic data may be represented as either a stream of hexadecimal -numbers or as a quoted string of ASCII characters. The length of the generic +numbers or as a quoted string of +.Tn ASCII +characters. The length of the generic data is automatically determined and inserted into the proper field(s) of the RFC1084-style bootp reply. -.PP +.Pp The following tags take a whitespace-separated list of IP addresses: -.BR cs , -.BR ds , -.BR gw , -.BR im , -.BR lg , -.BR lp , -.BR ns , -.BR nt , -.BR ra , -.BR rl , +.Em cs , +.Em ds , +.Em gw , +.Em im , +.Em lg , +.Em lp , +.Em ns , +.Em nt , +.Em ra , +.Em rl , and -.BR ts . +.Em ts . The -.BR ip , -.BR sa , -.BR sw , -.BR sm , +.Em ip , +.Em sa , +.Em sw , +.Em sm , and -.B ys +.Em ys tags each take a single IP address. All IP addresses are specified in standard Internet "dot" notation and may use decimal, octal, or hexadecimal numbers (octal numbers begin with 0, hexadecimal numbers begin with '0x' or '0X'). Any IP addresses may alternatively be specified as a hostname, causing -.I bootpd -to lookup the IP address for that host name using gethostbyname(3). +.Nm bootpd +to lookup the IP address for that host name using +.Xr gethostbyname 3 . If the -.B ip +.Em ip tag is not specified, -.I bootpd +.Nm bootpd will determine the IP address using the entry name as the host name. (Dummy entries use an invalid host name to avoid automatic IP lookup.) -.PP +.Pp The -.B ht +.Em ht tag specifies the hardware type code as either an unsigned decimal, octal, or hexadecimal integer or one of the following symbolic names: -.B ethernet +.Em ethernet or -.B ether +.Em ether for 10Mb Ethernet, -.B ethernet3 +.Em ethernet3 or -.B ether3 +.Em ether3 for 3Mb experimental Ethernet, -.BR ieee802 , -.BR tr , +.Em ieee802 , +.Em tr , or -.B token-ring +.Em token-ring for IEEE 802 networks, -.B pronet +.Em pronet for Proteon ProNET Token Ring, or -.BR chaos , -.BR arcnet , +.Em chaos , +.Em arcnet , or -.B ax.25 +.Em ax.25 for Chaos, ARCNET, and AX.25 Amateur Radio networks, respectively. The -.B ha +.Em ha tag takes a hardware address which may be specified as a host name or in numeric form. Note that the numeric form -.I must +.Em must be specified in hexadecimal; optional periods and/or a leading '0x' may be included for readability. The -.B ha +.Em ha tag must be preceded by the -.B ht +.Em ht tag (either explicitly or implicitly; see -.B tc +.Em tc below). If the hardware address is not specified and the type is specified as either "ethernet" or "ieee802", then -.I bootpd -will try to determine the hardware address using ether_hton(3). -.PP -The hostname, home directory, and bootfile are ASCII strings which may be +.Nm bootpd +will try to determine the hardware address using +.Xr ether_hostton 3 . +.Pp +The hostname, home directory, and bootfile are +.Tn ASCII +strings which may be optionally surrounded by double quotes ("). The client's request and the values of the -.B hd +.Em hd and -.B bf +.Em bf symbols determine how the server fills in the bootfile field of the bootp reply packet. -.PP +.Pp If the client provides a file name it is left as is. Otherwise, if the -.B bf +.Em bf option is specified its value is copied into the reply packet. If the -.B hd +.Em hd option is specified as well, its value is prepended to the boot file copied into the reply packet. The existence of the boot file is checked only if the -.BR bs =auto +.Em bs Ns =auto option is used (to determine the boot file size). A reply may be sent whether or not the boot file exists. -.PP +.Pp Some newer versions of -.I tftpd +.Xr tftpd 8 provide a security feature to change their root directory using the -.IR chroot (2) +.Xr chroot 2 system call. The -.B td +.Em td tag may be used to inform -.I bootpd +.Nm bootpd of this special root directory used by -.IR tftpd . +.Nm tftpd . (One may alternatively use the -.I bootpd -"-c chdir" option.) +.Nm bootpd +.Fl c Ar chdir +option.) The -.B hd +.Em hd tag is actually relative to the root directory specified by the -.B td +.Em td tag. For example, if the real absolute path to your BOOTP client bootfile is -/tftpboot/bootfiles/bootimage, and -.IR tftpd -uses /tftpboot as its "secure" directory, then specify the following in -.IR bootptab : -.PP -.br - :td=/tftpboot:hd=/bootfiles:bf=bootimage: -.PP -If your bootfiles are located directly in /tftpboot, use: -.PP -.br - :td=/tftpboot:hd=/:bf=bootimage: -.PP +.Pa /tftpboot/bootfiles/bootimage , +and +.Nm tftpd +uses +.Pa /tftpboot +as its "secure" directory, then specify the following in +.Pa bootptab : +.Pp +.Dl :td=/tftpboot:hd=/bootfiles:bf=bootimage: +.Pp +If your bootfiles are located directly in +.Pa /tftpboot , +use: +.Pp +.Dl :td=/tftpboot:hd=/:bf=bootimage: +.Pp The -.B sa +.Em sa tag may be used to specify the IP address of the particular TFTP server you wish the client to use. In the absence of this tag, -.I bootpd +.Nm bootpd will tell the client to perform TFTP to the same machine -.I bootpd +.Nm bootpd is running on. -.PP +.Pp The time offset -.B to +.Em to may be either a signed decimal integer specifying the client's time zone offset in seconds from UTC, or the keyword -.B auto +.Em auto which uses the server's time zone offset. Specifying the -.B to +.Em to symbol as a boolean has the same effect as specifying -.B auto +.Em auto as its value. -.PP +.Pp The bootfile size -.B bs +.Em bs may be either a decimal, octal, or hexadecimal integer specifying the size of the bootfile in 512-octet blocks, or the keyword -.B auto +.Em auto which causes the server to automatically calculate the bootfile size at each request. As with the time offset, specifying the -.B bs +.Em bs symbol as a boolean has the same effect as specifying -.B auto +.Em auto as its value. -.PP +.Pp The vendor magic cookie selector (the -.B vm +.Em vm tag) may take one of the following keywords: -.B auto +.Em auto (indicating that vendor information is determined by the client's request), -.B rfc1048 +.Em rfc1048 or -.B rfc1084 +.Em rfc1084 (which always forces an RFC1084-style reply), or -.B cmu +.Em cmu (which always forces a CMU-style reply). -.PP +.Pp The -.B hn +.Em hn tag is strictly a boolean tag; it does not take the usual equals-sign and value. It's presence indicates that the hostname should be sent to RFC1084 clients. -.I Bootpd +.Nm Bootpd attempts to send the entire hostname as it is specified in the configuration file; if this will not fit into the reply packet, the name is shortened to just the host field (up to the first period, if present) and then tried. In no case is an arbitrarily-truncated hostname sent (if nothing reasonable will fit, nothing is sent). -.PP +.Pp Often, many host entries share common values for certain tags (such as name servers, etc.). Rather than repeatedly specifying these tags, a full specification can be listed for one host entry and shared by others via the -.B tc +.Em tc (table continuation) mechanism. Often, the template entry is a dummy host which doesn't actually exist and never sends bootp requests. This feature is similar to the -.B tc +.Em tc feature of -.IR termcap (5) +.Xr termcap 5 for similar terminals. Note that -.I bootpd +.Nm bootpd allows the -.B tc +.Em tc tag symbol to appear anywhere in the host entry, unlike -.I termcap +.Pa termcap which requires it to be the last tag. Information explicitly specified for a host always overrides information implied by a -.B tc +.Em tc tag symbol, regardless of its location within the entry. The value of the -.B tc +.Em tc tag may be the hostname or IP address of any host entry previously listed in the configuration file. -.PP +.Pp Sometimes it is necessary to delete a specific tag after it has been inferred via -.BR tc . +.Em tc . This can be done using the construction -.IB tag @ +.Em tag Ns @ which removes the effect of -.I tag +.Em tag as in -.IR termcap (5). +.Xr termcap 5 . For example, to completely undo an IEN-116 name server specification, use -":ns@:" at an appropriate place in the configuration entry. After removal +.Em :ns@: +at an appropriate place in the configuration entry. After removal with -.BR @ , +.Em @ , a tag is eligible to be set again through the -.B tc +.Em tc mechanism. -.PP +.Pp Blank lines and lines beginning with "#" are ignored in the configuration file. Host entries are separated from one another by newlines; a single host entry may be extended over multiple lines if the lines end with a backslash @@ -348,11 +361,11 @@ entry may be extended over multiple lines if the lines end with a backslash may appear in any order, with the following exceptions: the hostname must be the very first field in an entry, and the hardware type must precede the hardware address. -.PP +.Pp An example -.I /etc/bootptab +.Pa /etc/bootptab file follows: -.PP +.Pp .nf # Sample bootptab file (domain=andrew.cmu.edu) @@ -385,11 +398,12 @@ file follows: mtoliver:ht=1:ha=00DD00FE1600:tc=.default: .fi -.SH FILES -/etc/bootptab - -.SH "SEE ALSO" -.br -bootpd(8), tftpd(8), -.br +.Sh FILES +.Bl -tag -width /etc/bootptab -compact +.It /etc/bootptab +.El +.Sh "SEE ALSO" +.Xr bootpd 8 , +.Xr tftpd 8 +.Pp DARPA Internet Request For Comments RFC951, RFC1048, RFC1084, Assigned Numbers -- cgit v1.1