Ertuğrul Erata
111 lines
3.8 KiB
Plaintext
111 lines
3.8 KiB
Plaintext
.\" This manpage has been automatically generated by docbook2man
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.\" from a DocBook document. This tool can be found at:
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.\" <http://shell.ipoline.com/~elmert/comp/docbook2X/>
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.\" Please send any bug reports, improvements, comments, patches,
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.\" etc. to Steve Cheng <steve@ggi-project.org>.
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.TH "RDISC" "8" "24 Mayıs 2011" "iputils-101006" "System Manager's Manual: iputils"
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.SH NAME
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rdisc \- network router discovery daemon
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.SH SYNOPSIS
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\fBrdisc\fR [ \fB-abdfstvV\fR] [ \fB\fIsend_address\fB\fR] [ \fB\fIreceive_address\fB\fR]
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.SH "DESCRIPTION"
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.PP
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\fBrdisc\fR implements client side of the ICMP router discover protocol.
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\fBrdisc\fR is invoked at boot time to populate the network
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routing tables with default routes.
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.PP
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\fBrdisc\fR listens on the ALL_HOSTS (224.0.0.1) multicast address
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(or \fIreceive_address\fR provided it is given)
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for ROUTER_ADVERTISE messages from routers. The received
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messages are handled by first ignoring those listed router addresses
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with which the host does not share a network. Among the remaining addresses
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the ones with the highest preference are selected as default routers
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and a default route is entered in the kernel routing table
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for each one of them.
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.PP
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Optionally, \fBrdisc\fR can avoid waiting for routers to announce
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themselves by sending out a few ROUTER_SOLICITATION messages
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to the ALL_ROUTERS (224.0.0.2) multicast address
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(or \fIsend_address\fR provided it is given)
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when it is started.
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.PP
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A timer is associated with each router address and the address will
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no longer be considered for inclusion in the the routing tables if the
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timer expires before a new
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\fBadvertise\fR message is received from the router.
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The address will also be excluded from consideration if the host receives an
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\fBadvertise\fR
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message with the preference being maximally negative.
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.PP
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Server side of router discovery protocol is supported by Cisco IOS
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and by any more or less complete UNIX routing daemon, f.e \fBgated\fR.
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.SH "OPTIONS"
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.TP
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\fB-a\fR
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Accept all routers independently of the preference they have in their
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\fBadvertise\fR messages.
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Normally \fBrdisc\fR only accepts (and enters in the kernel routing
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tables) the router or routers with the highest preference.
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.TP
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\fB-b\fR
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Opposite to \fB-a\fR, i.e. install only router with the best
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preference value. It is default behaviour.
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.TP
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\fB-d\fR
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Send debugging messages to syslog.
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.TP
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\fB-f\fR
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Run \fBrdisc\fR forever even if no routers are found.
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Normally \fBrdisc\fR gives up if it has not received any
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\fBadvertise\fR message after after soliciting three times,
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in which case it exits with a non-zero exit code.
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If \fB-f\fR is not specified in the first form then
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\fB-s\fR must be specified.
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.TP
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\fB-s\fR
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Send three \fBsolicitation\fR messages initially to quickly discover
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the routers when the system is booted.
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When \fB-s\fR is specified \fBrdisc\fR
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exits with a non-zero exit code if it can not find any routers.
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This can be overridden with the \fB-f\fR option.
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.TP
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\fB-t\fR
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Test mode. Do not go to background.
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.TP
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\fB-v\fR
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Be verbose i.e. send lots of debugging messages to syslog.
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.TP
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\fB-V\fR
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Print version and exit.
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.SH "HISTORY"
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.PP
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This program was developed by Sun Microsystems (see copyright
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notice in source file). It was ported to Linux by
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Alexey Kuznetsov
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<kuznet@ms2.inr.ac.ru>.
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It is now maintained by
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YOSHIFUJI Hideaki
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<yoshfuji@skbuff.net>.
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.SH "SEE ALSO"
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.PP
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\fBicmp\fR(7),
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\fBinet\fR(7),
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\fBping\fR(8).
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.SH "REFERENCES"
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.PP
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Deering, S.E.,ed "ICMP Router Discovery Messages",
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RFC1256, Network Information Center, SRI International,
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Menlo Park, Calif., September 1991.
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.SH "SECURITY"
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.PP
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\fBrdisc\fR requires CAP_NET_RAWIO to listen
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and send ICMP messages and capability CAP_NET_ADMIN
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to update routing tables.
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.SH "AVAILABILITY"
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.PP
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\fBrdisc\fR is part of \fIiputils\fR package
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and the latest versions are available in source form at
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http://www.skbuff.net/iputils/iputils-current.tar.bz2.
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