unnecessary route entry? Post: 24681

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Special Forums IP Networking unnecessary route entry? Post 24681 by RTM on Tuesday 16th of July 2002 02:29:25 PM

07-16-2002

Registered User

You probably need it. Here is an explaination from SUN - ( I know you aren't running Solaris (the route -n command does not give the information you showed)).

Q: What routes are automatically set up?

A: A few routes automatically get set up every time your machine is
booted.

First, all machines will always have a localhost route back to
themselves:

Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ------ ---------
127.0.0.1 127.0.0.1 UH 0 591 lo0

This is standard and increases the efficiency of packets that a
machine sends to itself.

Second, Solaris machines have a special multicast route:

224.0.0.0 150.101.16.28 U 3 0 le0

Multicast routes are used by certain programs that broadcast to a
group of machines rather than to the subnet in general.

Finally, all machines will always set up one route for each of their
interfaces. The route will be a simple one which says that all packets
which go to the interface's network should be routed through the
interface.

For example, I have one interface, le0, with an IP address of
150.101.16.28. Since I use a netmask of 255.255.255.0, this means that
my local network is 150.101.16.0, and the route looks like this:

150.101.16.0 150.101.16.28 U 3 951 le0

(It should be noted that machines which use point-to-point interfaces,
such as PPP, will have slightly different routes consult the PPP Tip
Sheet for more info on these.)

RTM

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LEARN ABOUT OSF1

routes

routes(4)						     Kernel Interfaces Manual							 routes(4)

NAME

       routes - Specifies Internet routing information to the routing tables

SYNOPSIS

       /etc/routes

DESCRIPTION

       Static  routes  can  be defined in the /etc/routes file.  The /etc/routes file identifies static routes that are automatically added to the
       network routing tables with the /usr/sbin/route add command.  The /sbin/init.d/route script contains the /usr/sbin/route add  command  that
       is executed for each entry in the /etc/routes file when the network is restarted on the system or the system is rebooted.

       The general format of an entry in the /etc/routes file is: Dest Name1 Name2

       The  following is a brief description of each element in an /etc/routes file entry: A keyword that indicates whether the route is to a net-
       work or to a host. The two possible keywords are -net and -host.  The name or address of the destination network or  host.   Name1  can	be
       either  a  symbolic  name (as used in the /etc/hosts or /etc/networks file) or an Internet address specified in dotted-decimal format.  The
       name or address of the gateway host to which messages should be forwarded.  Name2 can be either a symbolic name (as used in the	/etc/hosts
       file) or an Internet address specified in dotted-decimal format.

       The  routes file is a Context-Dependent Symbolic Link (CDSL) and must be maintained as such.  See the System Administration manual for more
       information.

EXAMPLES

       To specify a route to a network through a gateway host with an entry in the /etc/routes file, enter:

       -net net2 host4

	      This example specifies a route to a network, net2, through the gateway host4.  To specify a route to a host through a  gateway  host
	      with an entry in the /etc/routes file, enter:

	      -host host2 host4

	      This  example  specifies	a route to a host, host2, through the gateway host4.  To specify a route to a default gateway host with an
	      entry in the /etc/routes file, enter:

	      default 130.9.0.5

	      This example specifies a route to a default gateway with an Internet address of 130.9.0.5.

FILES

       Contains the /usr/sbin/routed add command.

RELATED INFORMATION

       Commands: route(8)

       Daemons: gated(8), routed(8)

       Files: gated.conf(4)

       Network Administration delim off

																	 routes(4)