Installing and Administering Internet Services

Chapter 9 309

Conﬁguring mrouted

When the mrouted daemon is started, it automatically reads the default

ASCII text conﬁguration ﬁle /etc/mrouted.conf. You can override the

default conﬁguration ﬁle by specifying an alternate ﬁle when invoking

mrouted; refer to “Starting mrouted” on page 313. If mrouted.conf is

changed while mrouted is running, you can issue the HP-UX command

kill -HUP to signal mrouted to reread the conﬁguration ﬁle.

By default, mrouted automatically conﬁgures itself to forward on all

multicast-capable interfaces, excluding the loopback “interface,” that

have the IFF_MULTICAST ﬂag set. Therefore, it is not necessary to

explicitly conﬁgure mrouted (that is, the mrouted.conf ﬁle need not

exist), unless you need to conﬁgure tunnel links, change the default

operating parameters, or disable multicast routing over a speciﬁc

physical interface.

Conﬁguration File Commands

This section describes the statements that can be deﬁned in the

/etc/mrouted.conf conﬁguration ﬁle. mrouted supports ﬁve

conﬁguration commands: phyint, tunnel, cache_lifetime, pruning,

and name. Associated with each command are one or more options.

The syntax of each command is shown below.

phyint local-addr [disable] [metric m] [threshold t] [rate_limit b]

[boundary (boundary-name|scoped-addr/mask-len)]

[altnet network/mask-len]

tunnel local-addr remote-addr [metric m] [threshold t] [rate_limit b]

[boundary (boundary-name|scoped-addr/mask-len)]

cache_lifetime ct

pruning off/on

name boundary-name scoped-addr/mask-len

The phyint command can be used to disable multicast routing on the

physical interface identiﬁed by local IP address local-addr (see ﬁgure

below), or to associate a non-default metric or threshold with the

speciﬁed physical interface. The local IP address local-addr may be

alternatively replaced by the interface name, such as lan0. If phyint is

attached to multiple IP subnets, use the altnet option to describe each

additional subnet (one altnet option for each subnet).