Hi!
I have next problem.
When I try to add a new route or delete a route to my Linux Server 2.4.21-20.EL i686 i386 GNU/Linux
I get next error


#route add -net 127.0.0.0

SIOCADDRT: Invalid argument


[root@webdev root]# route del -net 169.254.0.0

SIOCDELRT: Invalid argument


What would be wrong?

this may occur, if you have no suitable network device; ie, if you don't have a network device that is within the class of address or network for which you are trying to add the route.

Do you have a local interface? ("lo")

What's the output of /sbin/route?

Try this way:
route add -net 127.0.0.0/8

if You have more then 1 net interface you have to specify which interface this rule for
Example:
route add -net 127.0.0.0/8 dev eth0 <- I apply the rule for eth0 interface

Anyway RTFM (#man route, #man ifconfig, #man ip)

Good luck!

Hi!.
This is the output for /sbin/route

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 159.16.83.65 255.255.255.255 UGH 0 0 0 eth0
159.16.83.64 * 255.255.255.240 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default 159.16.83.65 0.0.0.0 UG 0 0 0 eth0


And the command
route add -net 127.0.0.0/8 dev eth0
works..

Why need to put the slash 8 ?


And how can I delete this route from my table
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0

I try.

[root@webdev root]# route del -net 169.254.0.0 netmask 255.255.255.240
SIOCDELRT: No such process
[root@webdev root]# route del -net 169.254.0.0 netmask 255.255.255.240 dev eth0
SIOCDELRT: No such process

Look at the IP address and subnet mask you entered. They don't match your routing table. It should be:

route del 159.16.83.64 netmask 255.255.255.240

Secondly, I don't think it's necessary to delete the 169.254.x.x route as all Linux's have this route. It's the reserved APIPA IP range.