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Full Discussion: Modifying Route
Special Forums IP Networking Modifying Route Post 23600 by Luftwaffe on Tuesday 25th of June 2002 07:55:57 PM
Old 06-25-2002
You need to be more specific if you want us to help you. Which operating systems do your machine run? One is NT what is the other one?

I can recommend you using the 'route' command. You'll see what gateways you got there. If have a wire connected from one machine to another there is no way you can connect through a gateway.

Be more specific please.
 

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route(8c)																 route(8c)

Name
       route - manually manipulate the routing tables

Syntax
       /etc/route [ -f ] [ -n ] command args ]

Description
       The  program  is  used  to manipulate the network routing tables manually.  However, normally it is not needed, as the system routing table
       management daemon, should tend to this task.

       The program accepts two commands: add, to add a route and delete, to delete a route.

       All commands have the following syntax:

	    /etc/route command [ net | host ] destination gateway [ metric ]

       In this syntax, destination is a host or network for which the route is to, gateway is the gateway to which packets  should  be	addressed,
       and  metric  is	an  optional count indicating the number of hops to the destination.  The metric is required for add commands.	It must be
       zero if the destination is on a directly-attached network, and nonzero if the route utilizes one or more gateways.

       When adding a route with metric 0, the gateway given is the address of this host on the common network, indicating the interface to be used
       for  transmission.   Routes to a particular host are distinguished from routes to a network by interpreting the Internet address associated
       with destination.  The optional keywords net and host force the destination to be interpreted as a network or host, respectively.   If  the
       destination  has  a local address part of INADDR_ANY, then the route is assumed to be to a network. Otherwise, it is presumed to be a route
       to a host.  If the route is to a destination connected via a gateway, the metric should be greater than 0.  All	symbolic  names  specified
       for a destination or gateway are looked up first as a host name using If this lookup fails, is then used to interpret the name as that of a
       network.

       The command uses a raw socket and the SIOCADDRT and SIOCDELRT ioctls to do its work.  As such, only the superuser can  modify  the  routing
       tables.

Options
       -f   Flushes  the routing tables of all gateway entries.  If is used with one of the commands described above, the tables are flushed prior
	    to the command's application.

       -n   Prevents attempts to print host and network names symbolically when reporting actions.

Restrictions
       The change operation is not implemented.  Therefore, you should first add the new route, and then delete the old one.

Diagnostics
       add [host | network] %s: gateway %s flags %x"
       The specified route is being added to the tables.  The values printed are from the routing table entry supplied in the ioctl call.  If  the
       gateway	address  used  was not the primary address of the gateway (the first one returned by the gateway address is printed numerically as
       well as symbolically.

       delete [ host | network] %s: gateway %s flags %x
       The specified route is being deleted from the tables.  The values printed are from the routing table entry supplied in the ioctl call.	If
       the  gateway  address used was not the primary address of the gateway (the first one returned by the gateway address is printed numerically
       as well as symbolically.

       %s %s done
       When the flag is specified, each routing table entry that is deleted is indicated with a message of this form.

       Network is unreachable
       An attempt to add a route failed because the gateway listed was not on a directly-connected network.  The next-hop gateway must be given.

       not in table
       A delete operation was attempted for an entry which was not present in the tables.

       routing table overflow
       An add operation was attempted, but the system was low on resources and was unable to allocate memory to create the new entry.

See Also
       intro(4n), routed(8c)

																	 route(8c)
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