{"id":3074,"date":"2022-12-20T16:43:25","date_gmt":"2022-12-20T19:43:25","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/rdisc-man8\/"},"modified":"2022-12-20T16:43:25","modified_gmt":"2022-12-20T19:43:25","slug":"rdisc-man8","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/rdisc-man8\/","title":{"rendered":"RDISC (man8)"},"content":{"rendered":"

RDISC<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
OPTIONS<\/a>
HISTORY<\/a>
SEE ALSO<\/a>
REFERENCES<\/a>
SECURITY<\/a>
AVAILABILITY<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

rdisc \u2212 network router discovery daemon<\/p>\n

SYNOPSIS <\/a> <\/h2>\n\n\n
<\/td>\n\n

rdisc<\/b> [\u2212abdfrstvV<\/b>] [\u2212p\u00a0<\/b>preference<\/i>] [\u2212T\u00a0<\/b>max_interval<\/i>] [send_address] [receive_address]<\/p>\n<\/td>\n<\/tr>\n<\/table>\n

DESCRIPTION <\/a> <\/h2>\n

rdisc<\/b> implements client side of the ICMP Internet Router Discovery Protocol (IRDP). rdisc<\/b> is invoked at boot time to populate the network routing tables with default routes.<\/p>\n

rdisc<\/b> listens on the ALL_HOSTS (224.0.0.1) multicast address (or receive_address<\/i> if it is provided) for ROUTER_ADVERTISE messages from routers. The received messages are handled by first ignoring those listed router addresses with which the host does not share a network. Among the remaining addresses the ones with the highest preference are selected as default routers and a default route is entered in the kernel routing table for each one of them.<\/p>\n

Optionally, rdisc<\/b> can avoid waiting for routers to announce themselves by sending out a few ROUTER_SOLICITATION messages to the ALL_ROUTERS (224.0.0.2) multicast address (or send_address<\/i> if it is provided) when it is started.<\/p>\n

A timer is associated with each router address and the address will no longer be considered for inclusion in the routing tables if the timer expires before a new advertise<\/b> message is received from the router. The address will also be excluded from consideration if the received advertise<\/b> message has a preference of maximum negative.<\/p>\n

Server side of router discovery protocol is supported by Cisco IOS and by any more or less complete UNIX routing daemon, for example gated<\/b>. If compiled with ENABLE_RDISC_SERVER, rdisc<\/b> can act as responder.<\/p>\n

OPTIONS <\/a> <\/h2>\n

\u2212a<\/b><\/p>\n

Accept all routers independently of the preference they have in their advertise<\/b> messages. Normally rdisc<\/b> only accepts (and enters in the kernel routing tables) the router or routers with the highest preference.<\/p>\n

\u2212b<\/b><\/p>\n

Opposite to \u2212a<\/b>, i.e. install only router with the best preference value. This is the default behaviour.<\/p>\n

\u2212d<\/b><\/p>\n

Send debugging messages to syslog.<\/p>\n

\u2212f<\/b><\/p>\n

Keep rdisc<\/b> running in the background even if no routers are found. Normally rdisc<\/b> gives up if it has not received any advertise<\/b> message after soliciting three times. In this case it exits with a non\u2212zero exit code. If \u2212f<\/b> is not specified in the first form then \u2212s<\/b> must be specified.<\/p>\n

\u2212r<\/b><\/p>\n

Responder mode, available only if compiled with ENABLE_RDISC_SERVER.<\/p>\n

\u2212s<\/b><\/p>\n

Send three solicitation<\/b> messages initially to quickly discover the routers when the system is booted. When \u2212s<\/b> is specified rdisc<\/b> exits with a non\u2212zero exit code if it can not find any routers. This can be overridden with the \u2212f<\/b> option.<\/p>\n

\u2212p<\/b> preference<\/i><\/p>\n

Set preference in advertisement messages. Available only with \u2212r option.<\/p>\n

\u2212T<\/b> max_interval<\/i><\/p>\n

Set maximum advertisement interval in seconds. Default is 600. Available only with \u2212r option.<\/p>\n

\u2212t<\/b><\/p>\n

Test mode. Do not go to background.<\/p>\n

\u2212v<\/b><\/p>\n

Be verbose and send lots of debugging messages to syslog.<\/p>\n

\u2212V<\/b><\/p>\n

Print version and exit.<\/p>\n

HISTORY <\/a> <\/h2>\n

This program was developed by Sun Microsystems (see copyright notice in source file). It was ported to Linux by Alexey Kuznetsov .<\/p>\n

SEE ALSO <\/a> <\/h2>\n

icmp<\/b>(7), inet<\/b>(7), ping<\/b>(8).<\/p>\n

REFERENCES <\/a> <\/h2>\n

RFC1256 ICMP Router Discovery Messages. S. Deering, Ed.. September 1991.<\/p>\n

SECURITY <\/a> <\/h2>\n

rdisc<\/b> requires CAP_NET_RAW to listen and send ICMP messages and capability CAP_NET_ADMIN to update routing tables.<\/p>\n

AVAILABILITY <\/a> <\/h2>\n

rdisc<\/b> is part of iputils<\/i> package.<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

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