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• Chapel Hill Transit U Route
• Map Of Route 10
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Name

route - show / manipulate the IP routing table

Synopsis

route [-CFvnee]

ifconfig(8) program.

When the add or del options are used, route modifies the routing tables. Without these options, route displays the currentcontents of the routing tables.

Options

-A family

use the specified address family (eg 'inet'; use 'route --help' for a full list).

-F

operate on the kernel's FIB (Forwarding Information Base) routing table. This is the default.

-C

operate on the kernel's routing cache.

-v

select verbose operation.

-n

show numerical addresses instead of trying to determine symbolic host names. This is useful if you are trying to determine why the route to your nameserverhas vanished.

-e

use netstat(8)-format for displaying the routing table. -ee will generate a very long line with all parameters from the routing table.

U Route Unc

del

Chapel Hill Transit U Route

delete a route.

add

add a new route.

target

the destination network or host. You can provide IP addresses in dotted decimal or host/network names.

-net

the target is a network.

-host

the target is a host.

netmask NM

when adding a network route, the netmask to be used.

gw GW

route packets via a gateway. NOTE: The specified gateway must be reachable first. This usually means that you have to set up a static route to thegateway beforehand. If you specify the address of one of your local interfaces, it will be used to decide about the interface to which the packets should berouted to. This is a BSDism compatibility hack.

metric M

set the metric field in the routing table (used by routing daemons) to M.

mss M

sets MTU (Maximum Transmission Unit) of the route to M bytes. Note that the current implementation of the route command does not allow the option to setthe Maximum Segment Size (MSS).

window W

set the TCP window size for connections over this route to W bytes. This is typically only used on AX.25 networks and with drivers unable to handle back toback frames.

irtt I

set the initial round trip time (irtt) for TCP connections over this route to I milliseconds (1-12000). This is typically only used on AX.25 networks. Ifomitted the RFC 1122 default of 300ms is used.

reject

install a blocking route, which will force a route lookup to fail. This is for example used to mask out networks before using the default route. This isNOT for firewalling.

mod, dyn, reinstate

install a dynamic or modified route. These flags are for diagnostic purposes, and are generally only set by routing daemons.

dev If

force the route to be associated with the specified device, as the kernel will otherwise try to determine the device on its own (by checking alreadyexisting routes and device specifications, and where the route is added to). In most normal networks you won't need this.

If dev If is the last option on the command line, the word dev may be omitted, as it's the default. Otherwise the order of the route modifiers(metric - netmask - gw - dev) doesn't matter.

Examples

ifconfig(8)).

route add -net 192.56.76.0 netmask 255.255.255.0 dev eth0

adds a route to the network 192.56.76.x via 'eth0'. The Class C netmask modifier is not really necessary here because 192.* is a Class C IP address. Theword 'dev' can be omitted here.

route add default gw mango-gw

adds a default route (which will be used if no other route matches). All packets using this route will be gatewayed through 'mango-gw'. The device whichwill actually be used for that route depends on how we can reach 'mango-gw' - the static route to 'mango-gw' will have to be set up before.

route add ipx4 sl0

Adds the route to the 'ipx4' host via the SLIP interface (assuming that 'ipx4' is the SLIP host).

route add -net 192.57.66.0 netmask 255.255.255.0 gw ipx4

This command adds the net '192.57.66.x' to be gatewayed through the former route to the SLIP interface.

route add -net 224.0.0.0 netmask 240.0.0.0 dev eth0

This is an obscure one documented so people know how to do it. This sets all of the class D (multicast) IP routes to go via 'eth0'. This is the correctnormal configuration line with a multicasting kernel.

route add -net 10.0.0.0 netmask 255.0.0.0 reject

This installs a rejecting route for the private network '10.x.x.x.'

Output

The output of the kernel routing table is organized in the following columns

Genmask

The netmask for the destination net; '255.255.255.255' for a host destination and '0.0.0.0' for the default route.

Flags

Possible flags include
U (route is up)
H (target is a host)
G (use gateway)
R (reinstate route for dynamic routing)
D (dynamically installed by daemon or redirect)
M (modified from routing daemon or redirect)
A (installed by addrconf)
C (cache entry)
! (reject route)

Metric

The 'distance' to the target (usually counted in hops). It is not used by recent kernels, but may be needed by routing daemons.

Ref

Number of references to this route. (Not used in the Linux kernel.)

Use

Count of lookups for the route. Depending on the use of -F and -C this will be either route cache misses (-F) or hits (-C).

Iface

Interface to which packets for this route will be sent.

MSS

Default maximum segement size for TCP connections over this route.

Window

Default window size for TCP connections over this route.

irtt

Initial RTT (Round Trip Time). The kernel uses this to guess about the best TCP protocol parameters without waiting on (possibly slow) answers.

HH (cached only)

The number of ARP entries and cached routes that refer to the hardware header cache for the cached route. This will be -1 if a hardware address is notneeded for the interface of the cached route (e.g. lo).

Arp (cached only)

Whether or not the hardware address for the cached route is up to date.

Files

/proc/net/ipv6_route
/proc/net/route
/proc/net/rt_cache

See Also

ip(8)

History

Route for Linux was originally written by Fred N. van Kempen,<waltje@uwalt.nl.mugnet.org> and then modified by Johannes Stille and Linus Torvalds for pl15. Alan Cox added the mss and window options for Linux1.1.22. irtt support and merged with netstat from Bernd Eckenfels.

Author

Currently maintained by Phil Blundell <Philip.Blundell@pobox.com>.

Referenced By

ebtables(8),garp(8),ifinfo(8),ipsec_ipsec_pluto(8),ipsec_pluto(8),ipsec_setup(8),miredo(8),netmask(1),networks(5),openvpn

Map Of Route 10

(8),proc(5),strongswan_pluto

Uroute Tms

(8),vtund.conf(5),wicd(8)