 |
Index for
Section 8 |
|
 |
Alphabetical
listing for O |
|
 |
Bottom of
page |
|
ogated(8)
NAME
ogated - The gateway routing daemon
SYNOPSIS
/usr/sbin/ogated [-t [i] [e] [r] [p] [u] [R] [H]] [logfile]
The ogated daemon processes multiple routing protocols according to the
configuration set in ogated.conf file.
FLAGS
-e Logs all external errors due to EGP, exterior routing errors, and
EGP state changes.
-H Traces all HELLO packets received.
-i Logs all internal errors and interior routing errors.
-p Traces all EGP packets sent and received.
-R Traces all RIP packets received.
-r Logs all routing changes.
-t If used alone, the -t flag starts the -i, -e, -r, and -p trace
flags. When used with another flag, the -t flag has no effect
and only the accompanying flags are recognized. Note that when
other flags are used, the -t flag must be used with them and must
be the first flag given in the command line.
-u Logs all routing updates sent. The ogated daemon always logs
fatal errors. If no log file is specified and none of the
preceding trace flags are set, all messages are sent to the
/dev/null file.
DESCRIPTION
The ogated daemon manages multiple routing protocols, including the Routing
Information Protocol (RIP), Exterior Gateway Protocol (EGP), and Local
Network Protocol (HELLO). The ogated process can be configured to perform
all or any combination of these routing protocols. It replaces daemons
that use the HELLO routing protocol; for example, routed (8) and egpup (8).
The configuration for the ogated daemon is by default stored in the
/etc/ogated.conf file, and can be changed at compile time in the file
defs.h. The ogated daemon stores its process ID in the /var/run/ogated.pid
file.
When a routing update indicates that the route in use is being deleted, the
ogated daemon waits for 2 minutes before deleting the route. Be aware that
unpredictable results may occur when the ogated and routed daemons are run
together on the same host.
Start the ogated daemon with a log file that you specify on the command
line. You can also enter one or more trace flags on the command line or
specify the flags in the traceflags stanza of the ogated.conf configuration
file. When trace flags are specified without a log file, all trace output
is sent to the controlling terminal.
By default, the ogated daemon forks and detaches itself from the
controlling terminal.
When certain networks are restricted from using the Internet network, the
ogated daemon uses both the syslogd daemon at the LOG_WARNING log level and
the LOG_DAEMON facility to record all invalid networks.
If you use the EGP when you supply the default route (by the RIP or HELLO
gateway) and all EGP neighbors are lost, the default route is not
advertised until at least one EGP neighbor is regained.
The RIP both propagates and listens to host routes. This allows the ogated
daemon to handle point-to-point links with consistency. The ogated daemon
also supports the RIP_TRACE commands.
The ogated daemon detects changes made to the network interfaces and its
own start-up flags while it is running. Thus, you need not restart the
ogated daemon if you change the configuration. However, if the net mask,
subnet mask, broadcast address, or interface metric is changed, use the
ifconfig(8) command to mark the interface down and then up 30 seconds
later.
Subnet interfaces are supported. Subnet information is passed through
interfaces to other subnets of the same network.
The ogated daemon listens to host and network REDIRECT signals. The daemon
tries to take an action for its own internal tables. This action is
parallel to the action the kernel takes on the REDIRECT signal.
In addition, the ogated daemon cancels (times out) all routes learned from
REDIRECT signals in 6 minutes. The daemon then deletes the route from the
kernel routing tables, which keeps the routing tables consistent.
No routing protocol announces routes learned from REDIRECT signals.
The ogated EGP code verifies that all networks sent and received are valid
class A, B, or C networks as specified by the EGP. The ogated daemon does
not contribute information about networks that do not meet EGP
specifications. If an EGP update packet contains information about a
network that is not class A, B, or C, the ogated daemon considers the
update to be in error and ignores it.
Signals
The ogated server performs the following actions when you use the kill(1)
command to send it the SIGHUP and SIGINT signals.
SIGHUP When a SIGHUP signal is sent to a ogated daemon that was invoked
with trace flags and a log file, tracing is toggled off and the
log file is closed. At this point the log file can be moved or
deleted. When the next SIGHUP signal is sent to the ogated
daemon, tracing is toggled on. The ogated daemon reads the
/etc/ogated.conf configuration file and sets the trace flags to
those specified by the traceflags stanza.
If no traceflags stanza exists, tracing resumes and uses any
trace flags specified on the command line. Trace output is sent
to the log file specified on the command line. The output is
appended if the log file already exists, and the file is created
if it does not exist.
SIGINT Sending the ogated daemon a SIGINT signal causes a memory dump to
be scheduled within the next 60 seconds. The memory dump is
written to a file named /usr/tmp/ogated_dump. The ogated daemon
processes all pending routing updates before performing the
memory dump.
The memory dump contains a snapshot of the current ogated daemon
status, including the interface configurations, EGP neighbor
status, and the routing tables. If the /usr/tmp/ogated_dump file
already exists, the memory dump is appended to the existing file.
Internal Metrics for the ogated Daemon
The ogated daemon stores all metrics internally as a time delay in
milliseconds to preserve the granularity of HELLO time delays. The
internal delay ranges from 0 to 30,000 milliseconds, with 30,000
representing infinity. Metrics from other protocols are translated to and
from a time delay as they are received and transmitted. EGP distances are
not comparable to HELLO and RIP metrics but are stored as time delays
internally for comparison with other EGP metrics. The conversion factor
between EGP distances and time delays is 100.
RIP and interface metrics are translated to and from the internal time
delays with the use of the following translation tables. The first two
columns represent the time delay to RIP metric translation, while the
second two columns represent the RIP metric to time delay translation.
Time Delay
Minimum Maximum RIP Metric RIP Metric Time Delay
0 0 0 0 0
1 100 1 1 100
101 148 2 2 148
149 219 3 3 219
220 325 4 4 325
326 481 5 5 481
482 713 6 6 713
714 1057 7 7 1057
1058 1567 8 8 1567
1568 2322 9 9 2322
2323 3440 10 10 3440
3441 5097 11 11 5097
5098 7552 12 12 7552
7553 11,190 13 13 11,190
11,191 16,579 14 14 16,579
16,580 24,564 15 15 24,564
24,565 30,000 16 16 30,000
CAUTIONS
Unpredictable results may occur when the ogated and routed daemons are run
together on the same host.
FILES
/usr/sbin/ogated
Specifies the command path
/var/run/ogated.conf
Contains the ogated configuration information
/var/run/ogated.pid
Contains the ogated process ID
/usr/tmp/ogated_dump
Specifies the memory dump file
RELATED INFORMATION
Commands: kill, routed(8)
Files: ogated.conf(4)
|
Index for
Section 8 |
|
|
Alphabetical
listing for O |
|
 |
Top of
page |
|