Route commands in Dos and Linux

Dos command route
——————-
Command to manually configure the routes in the routing table

Syntax

ROUTE [-f] [-p] [-4|-6] command [destination]
[MASK netmask]  [gateway] [METRIC metric]  [IF interface]

-f           Clears the routing tables of all gateway entries.  If this is
used in conjunction with one of the commands, the tables are
cleared prior to running the command.

-p           When used with the ADD command, makes a route persistent across
boots of the system. By default, routes are not preserved
when the system is restarted. Ignored for all other commands,
which always affect the appropriate persistent routes.This
option is not supported in Windows 95.

-4           Force using IPv4.

-6           Force using IPv6.

command      One of these:
PRINT     Prints  a route
ADD       Adds    a route
DELETE    Deletes a route
CHANGE    Modifies an existing route
destination  Specifies the host.
MASK         Specifies that the next parameter is the ‘netmask’ value.
netmask      Specifies a subnet mask value for this route entry.
If not specified, it defaults to 255.255.255.255.
gateway      Specifies gateway.
interface    the interface number for the specified route.
METRIC       specifies the metric, ie. cost for the destination.

All symbolic names used for destination are looked up in the network database
file NETWORKS. The symbolic names for gateway are looked up in the host name
database file HOSTS.

If the command is PRINT or DELETE. Destination or gateway can be a wildcard,
(wildcard is specified as a star ‘*’), or the gateway argument may be omitted.

If Dest contains a * or ?, it is treated as a shell pattern, and only
matching destination routes are printed. The ‘*’ matches any string,
and ‘?’ matches any one char. Examples: 157.*.1, 157.*, 127.*, *224*.

Pattern match is only allowed in PRINT command.
Diagnostic Notes:
Invalid MASK generates an error, that is when (DEST & MASK) != DEST.
Example> route ADD 157.0.0.0 MASK 155.0.0.0 157.55.80.1 IF 1
The route addition failed: The specified mask parameter is invalid.
(Destination & Mask) != Destination.

Examples:

> route PRINT
> route PRINT -4
> route PRINT -6
> route PRINT 157*          …. Only prints those matching 157*

> route ADD 157.0.0.0 MASK 255.0.0.0  157.55.80.1 METRIC 3 IF 2
destination^      ^mask      ^gateway     metric^    ^
Interface^
If IF is not given, it tries to find the best interface for a given
gateway.
> route ADD 3ffe::/32 3ffe::1

> route CHANGE 157.0.0.0 MASK 255.0.0.0 157.55.80.5 METRIC 2 IF 2

CHANGE is used to modify gateway and/or metric only.

> route DELETE 157.0.0.0
> route DELETE 3ffe::/32

Command         Purpose
add             Adds a route.
change             Modifies an existing route.
delete             Deletes a route or routes.
print             Prints a route or routes.

Route add

route add “destination” mask “subnetmask” “gateway” metric “costmetric” if “interface”

Eg.
route add -p 10.0.0.0 mask 255.0.0.0 192.168.0.1 metric 2

In simple route add -p 10.0.0.0 mask 255.0.0.0 192.168.0.1

Routes added by using the -p option are stored in the Windows registry under the following key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip \Parameters\PersistentRoutes

To delete the route to the destination 10.41.0.0 with the subnet mask of 255.255.0.0, type:

route delete 10.41.0.0 mask 255.255.0.0

To delete all routes in the IP routing table that begin with 10., type:

route delete 10.*

To change the next hop address of the route with the destination of 10.41.0.0 and the subnet mask of 255.255.0.0 from 10.27.0.1 to 10.27.0.25, type:

route change 10.41.0.0 mask 255.255.0.0 10.27.0.25

Linux route command
——————–
Display Existing Routes
$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 eth0

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         192.168.1.10    0.0.0.0         UG    0      0        0 eth0

Adding a Default Gateway
$ route add default gw 192.168.1.10

List Kernel’s Routing Cache Information
$ route -Cn
Kernel IP routing cache
Source          Destination     Gateway         Flags Metric Ref    Use Iface
192.168.1.157   192.168.1.51    192.168.1.51          0      0        1 eth0
192.168.1.157   74.125.236.69   192.168.1.10          0      0        0 eth0

Reject Routing to a Particular Host or Network
$ route add -host 192.168.1.51 reject
$ route add -net 192.168.1.0 netmask 255.255.255.0 reject

Advertisements

Posted on July 2, 2014, in General, LInux Based, Windows. Bookmark the permalink. Leave a comment.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: