Default route deleted from the Fedora's routing table

RedHatAddict · 09-14-2009, 01:50 AM

Greetings,

My static route was deleted after some equipments were halted by mistake in my topology:

Server -> Switch -> Cisco Router -> Internet

Though, the server was not rebooted, I've checked with the uptime command.

The distribution is Fedora Core 10, but I believe that doesn't matter so much.

The command I've used is: route add default gw Ciscorouter's_IP

Can anyone tell me WHY that route would disappear? What are the conditions a route would disappear from the routing table?

Thanks a lot guys!

WorldIsNotFair · 09-14-2009, 02:44 AM

I guess that you don't put your gateway into the configuration file.

is the switch connected to server go down ?

if yes, then IMO the scenario will be like this:

switch down - network interface down(no ip) - switch up - network iface up(OS reread the network config file)

Just guessing.

RedHatAddict · 09-14-2009, 03:23 AM

The switch went down.

The route has been written in the conf file (checked by setup command), and the IP was on the interface, the interface was up. Everything was ok on the server except that static route.

In dmesg I saw some messages that the link went down.

RedHatAddict · 09-14-2009, 12:14 PM

Any ideas please?

Thanks a lot!

RedHatAddict · 09-19-2009, 11:40 AM

What the reason could be?

RedHatAddict · 09-26-2009, 03:30 AM

Somebody, please?

WorldIsNotFair · 09-26-2009, 03:39 AM

Are u using NetworkManager ?

if you are using NetworkManager, it doesn't read the gateway config on /etc/sysconfig/network
, u have to put the parameter on /etc/sysconfig/network-scripts/ifcfg-[interface]

or you can put a script under /etc/NetworkManager/dispatcher.d/

regards

RedHatAddict · 09-27-2009, 07:41 AM

Hello,

NetworkManager isn't a GUI tool from Gnome?

I am using "Setup" in the terminal to configure the network eths.

Quote:

Originally Posted by WorldIsNotFair

Are u using NetworkManager ?

if you are using NetworkManager, it doesn't read the gateway config on /etc/sysconfig/network
, u have to put the parameter on /etc/sysconfig/network-scripts/ifcfg-[interface]

or you can put a script under /etc/NetworkManager/dispatcher.d/

regards

kirukan · 09-27-2009, 08:19 AM

can you able to ping your default gateway?

Quote:

Can anyone tell me WHY that route would disappear?

#route -n just check this and what is the output for this
Ex-
#route add -net 172.16.10.0/16 gw 172.16.10.250
If you reboot the server or even restart the network services you will lost the route

WorldIsNotFair · 09-28-2009, 04:33 AM

so, is it default route problem or additional static route ?

@RedHataddict
Yes, if you are using NetworkManager its override Network service,
check your running service.

Quote:

Originally Posted by kirukan

can you able to ping your default gateway?

#route -n just check this and what is the output for this
Ex-
#route add -net 172.16.10.0/16 gw 172.16.10.250
If you reboot the server or even restart the network services you will lost the route

RedHatAddict · 09-28-2009, 01:42 PM

Quote:

Originally Posted by WorldIsNotFair

so, is it default route problem or additional static route ?

@RedHataddict
Yes, if you are using NetworkManager its override Network service,
check your running service.

I am using the "setup" utility in the console mode. I just enter setup in the terminal and write the settings in the networking tab. Isn't this enaugh?

WorldIsNotFair · 09-28-2009, 09:16 PM

yes, thats should be enough, since 'setup' write default gateway config to network-scripts/ifcfg-[interface]

and even if you using NetworkManager its should be ok for default gateway.

The only problem when using NetworkManager is when you add additional route.

You may want to find if there is network configuration file under /etc/sysconfig/network that may overriding each others.

Sorry can help much.