gated.conf.4 (2010 09)
g
gated.conf(4) gated.conf(4)
When a Router Advertisement with a zero lifetime is received, the host deletes all routes with next-hop
addresses learned from that router. In addition, any routers learned from ICMP redirects pointing to
these addresses will be deleted. The same will happen when a Router Advertisement is not received to
refresh these routes before the lifetime expires.
The Router Discovery Client Statement
routerdiscovery client yes | no | on | off [ {
traceoptions trace_options ;
preference preference ;
interface interface_list
[ enable ]|[disable ]
[ broadcast ]|[multicast ]
[ quiet ]|[solicit ]
;
} ] ;
traceoptions trace_options
Specifies the tracing options for OSPF. (See Trace Statements and the OSPF specific tracing
options below.)
preference preference ;
Specifies the preference of all Router Discovery default routes. The default is 55.
interface interface_list
Specifies the parameters that apply to physical interfaces. Note a slight difference in conven-
tion from the rest of GateD, interface specifies just physical interfaces (such as le0, ef0
and en1). The Router Discovery Client has no parameters that apply only to interface
addresses.
enable Specifies that Router Discovery should be performed on the specified
interface(s). This is the default.
disable Specifies that Router Discovery should not be performed on the specified
interface(s).
broadcast Specifies that Router Solicitations should be broadcast on the specified
interface(s). This is the default if IP multicast support is not available on
this host or interface.
multicast Specifies that Router Solicitations should be multicast on the specified
interface(s). If IP multicast is not available on this host and interface, no
solicitation will be performed. The default is to multicast Router Solicita-
tions if the host and interface support it. Otherwise Router Solicitations
are broadcast.
quiet Specifies that no Router Solicitations will be sent on this interface, even
though Router Discovery will be performed.
solicit Specifies that initial Router Solicitations will be sent on this interface. This
is the default.
Tracing options
The Router Discovery Client and Server support the state trace flag which traces various protocol
occurrences.
state State transitions
The Router Discovery Client and Server do not directly support any packet tracing options, tracing of
router discovery packets is enabled via the ICMP Statement.
The Kernel Statement
While the kernel interface is not technically a routing protocol, it has many characteristics of one, and
GateD handles it similarly to one. The routes GateD chooses to install in the kernel forwarding table are
those that will actually be used by the kernel to forward packets.
The add, delete and change operations GateD must use to update the typical kernel forwarding table take
a nontrivial amount of time. This does not present a problem for older routing protocols (RIP, EGP),
which are not particularly time critical and do not easily handle very large numbers of routes anyway.
The newer routing protocols (OSPF, BGP) have stricter timing requirements and are often used to process
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