Ubuntu – How to set permanent route in Ubuntu 10.10

networkingroutingUbuntu

I'm trying to configure my wireless network to use gateway 10.0.1.252 when accessing IP addresses that start with 10.0.0.

I followed a few explanations on how to do it with the interfaces file but without success.

This is the content of my initial /etc/network/interfaces file:

auto lo
iface lo inet loopback

After several hours searching and reading I made it look like this:

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth1

iface eth1 inet static
address 10.0.1.171
netmask 255.255.255.0
broadcast 10.0.1.255
gateway 10.0.1.254

# static route
up route add -net 10.0.0.0/24 gw 10.0.1.252 dev eth1

Mentioned configuration works after I restart networking and until I restart Ubuntu. After I restart Ubuntu, I lose network manager and cannot connect to Internet or intended addresses 10.0.0.x.

What am I doing wrong, or is there a simpler way of setting a permanent route in newer versions of Ubuntu?

Just to mention I'm configuring wireless connection, because I do not use wired one.

UPDATE 1: (~$ ifconfig)

eth0      Link encap:Ethernet  HWaddr 00:24:81:64:9a:5c  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:17 

eth1      Link encap:Ethernet  HWaddr 00:21:00:d8:25:45  
          inet addr:10.0.1.171  Bcast:10.0.1.255  Mask:255.255.255.0
          inet6 addr: fe80::221:ff:fed8:2545/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:17 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:284 errors:0 dropped:0 overruns:0 frame:0
          TX packets:284 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:21280 (21.2 KB)  TX bytes:21280 (21.2 KB)

UPDATE 2: (~$ route -n)

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.0.0.0        10.0.1.252      255.255.255.0   UG    0      0        0 eth1
10.0.1.0        0.0.0.0         255.255.255.0   U     0      0        0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth1
0.0.0.0         10.0.1.254      0.0.0.0         UG    100    0        0 eth1

UPDATE 3:
I realised that there is a problem with this code: 

iface eth1 inet static
address 10.0.1.171
netmask 255.255.255.0
broadcast 10.0.1.255
gateway 10.0.1.254

If I comment it out I get network manager and Internet access, but not my desired route.

Best Answer

If you've configured the network through ifupdown (i.e. in /etc/network/interfaces), and it works when you start networking manually but not after a fresh boot, one possibility is that your setup is bringing up the network correctly, and then some other system component reconfigures the network. The obvious suspect is Network Manager. Make sure that in /etc/NetworkManager/nm-system-settings.conf, under [ifupdown], you have managed=false. (It's the default, at least under Ubuntu 10.04, but maybe that changed in 10.10 or you changed it in previous experiments with Network Manager.)

If you want to stick with Network Manager, you can tell it to add the extra route. As of Ubuntu 10.04 (other distributions might not set up Network Manager in the same way), Network Manager executes the ifupdown scripts in /etc/network/if-*.d/. The role of these scripts is similar to the up, down, pre-up and post-down directives in /etc/network/interfaces (which Network Manager does not execute). Comment out all mentions of eth1 from/etc/network/interfaces` so that Network Manager will manage this interface.

The scripts are documented in the interfaces(5) man page. They are executed in an environment containing information about the connection being started or stopped, in particular $IFACE is the interface name. So put the following script in /etc/network/if-up.d/zzzz-milan-wireless-route:

#!/bin/sh
if [ "$IFACE" = "eth1" ]; then
  route add -net 10.0.0.0/24 gw 10.0.1.252 dev eth1
fi

Make it executable: chmod 755 /etc/network/if-up.d/zzzz-milan-wireless-route. The next time Network Manager brings up the network, you should have your default route.

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