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MAN page from Trustix iputils-0.0.20020927-8tr.i586.rpm

RDISC

Section: System Manager's Manual: iputils (8)
Updated: 27 September 2002
Index 

NAME

rdisc - network router discovery daemon 

SYNOPSIS

rdisc [ -abdfstvV] [ send_address] [ receive_address]

 

DESCRIPTION

rdisc implements client side of the ICMP router discover protocol.rdisc is invoked at boot time to populate the networkrouting tables with default routes.

rdisc listens on the ALL_HOSTS (224.0.0.1) multicast address(or receive_address provided it is given) for ROUTER_ADVERTISE messages from routers. The receivedmessages are handled by first ignoring those listed router addresseswith which the host does not share a network. Among the remaining addressesthe ones with the highest preference are selected as default routersand a default route is entered in the kernel routing tablefor each one of them.

Optionally, rdisc can avoid waiting for routers to announce themselves by sending out a few ROUTER_SOLICITATION messagesto the ALL_ROUTERS (224.0.0.2) multicast address (or send_address provided it is given) when it is started.

A timer is associated with each router address and the address willno longer be considered for inclusion in the the routing tables if the timer expires before a new advertise message is received from the router.The address will also be excluded from consideration if the host receives an advertisemessage with the preference being maximally negative.

Server side of router discovery protocol is supported by Cisco IOSand by any more or less complete UNIX routing daemon, f.e gated. 

OPTIONS

-a
Accept all routers independently of the preference they have in their advertise messages.Normally rdisc only accepts (and enters in the kernel routingtables) the router or routers with the highest preference.
-b
Opposite to -a, i.e. install only router with the bestpreference value. It is default behaviour.
-d
Send debugging messages to syslog.
-f
Run rdisc forever even if no routers are found.Normally rdisc gives up if it has not received any advertise message after after soliciting three times,in which case it exits with a non-zero exit code.If -f is not specified in the first form then -s must be specified.
-s
Send three solicitation messages initially to quickly discoverthe routers when the system is booted.When -s is specified rdiscexits with a non-zero exit code if it can not find any routers.This can be overridden with the -f option.
-t
Test mode. Do not go to background.
-v
Be verbose i.e. send lots of debugging messages to syslog.
-V
Print version and exit.
 

HISTORY

This program was developed by Sun Microsystems (see copyrightnotice in source file). It was ported to Linux byAlexey Kuznetsov<kuznetAATTms2.inr.ac.ru>. 

SEE ALSO

icmp(7),inet(7),ping(8). 

REFERENCES

Deering, S.E.,ed "ICMP Router Discovery Messages",RFC1256, Network Information Center, SRI International,Menlo Park, Calif., September 1991. 

SECURITY

rdisc requires CAP_NET_RAWIO to listenand send ICMP messages and capability CAP_NET_ADMINto update routing tables.  

AVAILABILITY

rdisc is part of iputils packageand the latest versions are available in source form for anonymous ftpftp://ftp.inr.ac.ru/ip-routing/iputils-current.tar.gz.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
HISTORY
SEE ALSO
REFERENCES
SECURITY
AVAILABILITY

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