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 DEBIAN

vde_l3

VDE_L3(1)						      General Commands Manual							 VDE_L3(1)

NAME

       vde_l3 - Virtual Distributed Ethernet 'Layer 3' Switch.

SYNOPSIS

       vde_l3 -v vde_plug:ipaddress/netmask [-v...]  [-r target_network/netmask:gateway] [-G default_gw] [-M mgmt_socket]

DESCRIPTION

       A vde_l3 connects to one or more vde_switches, performing ip forwarding among its virtual interfaces. A new interface is created at startup
       for each -v option given at command line. Static routes to target networks can be defined using the -r option.

       vde_l3 -v /var/run/s1.ctl:192.168.0.1/24

       connects to the vde sock at /var/run/s1.ctl with its virtual interface ve0, having the address 192.168.0.1 and netmask 255.255.255.0.

       vde_l3 

       -v /var/run/s1.ctl:192.168.0.1/24 

       -v /var/run/s2.ctl:10.0.0.254/255.255.0.0

       connects to the two vde socks, with its virtual interfaces ve0 and ve1, having addressess 192.168.1.0 and 10.0.0.254 respectively. Hosts in
       each network can specify the vde_l3 as their gateway to reach the other one.

OPTIONS

       -v vde_plug:ipaddress/netmask
	      Creates a virtual network interfaces on the vde_l3 box, with address ipaddress and netmask netmask. Please note that the netmask can
	      be specified either in the 'classic' A.B.C.D mode, or just by giving the number of leading bits (f.e., /17 for 255.255.128.0).   One
	      can define as many interfaces as she wants.

       -r target_network/netmask:gateway
	      Specify  a static route through gateway to reach hosts in target_network with netmask netmask.  One can define as many routes as she
	      wants.

       -G default_gw
	      Specify a default gateway, to be used whenever no static route is defined for a target host.

       -M mgmt_socket
	      the unix socket where the parameters (interfaces addresses, routes, etc.) can be checked and changed  runtime.  unixterm(1)  can	be
	      used as a remote terminal for wirefilter.

NOTICE

       Virtual	Distributed  Ethernet is not related in any way with www.vde.com ("Verband der Elektrotechnik, Elektronik und Informationstechnik"
       i.e. the German "Association for Electrical, Electronic & Information Technologies").

SEE ALSO

       vde_switch(1), vdeq(1), unixterm(1), vde_cryptcab(1), wirefilter(1).

AUTHORS

       VDE_L3 is a tool by Daniele Lacamera <root@danielinux.net>

       VDE is a project by Renzo Davoli <renzo@cs.unibo.it>

Virtual Distributed Ethernet					    May 7, 2007 							 VDE_L3(1)