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Here is my route -n output:


Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.122.0   0.0.0.0         255.255.255.0   U     0      0        0 virbr0

And if I try to add a static route by this command:

route add -net 192.168.50.0 netmask 255.255.255.0 gw 192.168.50.1

I get the following output:

SIOCADDRT: No such process

Why that? Can anybody explain my the concept of adding static routes in linux.

If I also have a route-eth0 file under the /etc/sysconfig/network-scripts/ directory, with this line in it: 123.123.123.0/24 via 123.123.124.1, no effect is achieved after I restart the network.

So, can anybody give me some explanations, links or related stuff to read on this?

Thanks!

NOTE: What I observed: if I have added the 192.168.50.0 network and points to 'default' gateway (0.0.0.0), my command works good. But if I haven't it, I got the already mentioned ERROR. So, can you show me what I need to do more and where I'm wrong?

P.S. I'm a kind of a newbie in linux networking.

artaxerxe
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  • Are your IP's in network-scripts valid ? – Lucas Kauffman Jan 13 '12 at 12:55
  • there is probably something wrongly configured in your networking. post your /etc/sysconfig/network-scripts/ifcfg-eth0 and /etc/sysconfig/network files – thanosk Jan 13 '12 at 12:55
  • @thanosk I don't have a /etc/sysconfig/network-scripts/ifcfg-eth0 file. And my network file looks like:`NETWORKING=yes HOSTNAME=artaxerxe`. So, if I need more on this, just suggest me what I need to do. Thanks. – artaxerxe Jan 13 '12 at 13:00
  • What do you have under? Also, can you run the following and paste it into your paste: "ip addr" – Rilindo Jan 13 '12 at 13:30
  • @artaxerxe well it seems you have no networking configured at all. Run a tool like system-config-network to help you through – thanosk Jan 13 '12 at 15:21
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    The posted output seems to be taken from 'route -n' not from 'ifconfig'. – Khaled Jan 13 '12 at 17:39
  • @Khaled Thanks. It was my mistake. I corrected it. – artaxerxe Jan 14 '12 at 09:28
  • @artaxerxe: Can you please post the output of `ip addr show` and `ifconfig`? – Khaled Jan 14 '12 at 09:51
  • @Khaled Now I'm not at my working station. I'll do it on Monday. Until then, I cannot do anything. I beg your pardon...:) – artaxerxe Jan 14 '12 at 10:05

2 Answers2

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The route you're trying to add is recursive. 

route add -net 192.168.50.0 netmask 255.255.255.0 gw 192.168.50.1

This translate to the following:

The next hop for 192.168.50.0/24 is 192.168.50.1

Ok. What is the next hop for 192.168.50.1?

The next hop for 192.168.50.0/24 is 192.168.50.1

> Uh? But this ain't possible. Then outputs the cryptic SIOCADDRT: No such process

This is confirmed by the second route you added:

route add -net 192.168.50.0 netmask 255.255.255.0 gw 192.168.122.x

Your default gateway should be in the 192.168.122.0/24 network to be reachable from your computer.

petrus
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2

You can get the "SIOCADDRT: No such process" error if "You attempted to set a route for a network before setting a host route for the gateway which handles traffic for that network."

ANSWER: First create a host route, then create a net route.

e.g. for network in question: local -> 192.168.50.1 -> 192.168.50.xx

route add -host 192.168.50.1 dev eth0
route add -net 192.168.50.0 netmask 255.255.255.0 gw 192.168.50.1

This helped me https://support.symantec.com/en_US/article.TECH142841.html

gaoithe
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