How to make a change to the routing table persist?

Question

I am running raspbian and I can access anything on my lan through ethO but cannot ping an internet address. route -n says the following:

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0

then I run sudo /sbin/route add -net 0.0.0.0 gw 192.168.1.1 eth0 followed by route -n and get

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0

And everything works. So, how do I make this permanent so I don't have to run the route command everytime I boot the PI?

Answer 1

Adding to /etc/network/interfaces didn't work for me in Raspbian/Jessie. I was adding a second route to a VPN subnet so already had used VMMF's method to add the default route; but adding

ip route add 192.168.[othersubnet].0/24 via 192.168.1.1

to a new file created at

/lib/dhcpcd/dhcpcd-hooks/40-vpnroute

hooked on to /etc/dhcpcd.conf and added the route persistently.

Ref:https://wiki.archlinux.org/index.php/dhcpcd#DHCP_static_route.28s.29 and thx VMMF for the pointers in your comments.

Answer 2

To make the Static Route persistent or you must add the route entries to /etc/network/interfaces

Add the static routes in the following format:

ip route add [-net|-host] <host/net>/<mask> gw <host/IP> dev <Interface>

Note This is no longer valid for Raspbian Jessie, as of June 2016 you should edit the /etc/dhcpcd.conf file instead.

Answer 3

It should be noted that the up entry should be put against the iface entry (stanza as it is called in the man pages). So a more complete example for the file /etc/network/interfaces would look like this

iface eth0 inet dhcp
   up route add -net 10.200.196.0 netmask 255.255.252.0 gw 10.200.205.225 metric 1

The indent is apparently not required but usually added for clarity.

Answer 4

the problem is, you have a class A ip local address, great you have an ip address but you have the default gateway as your broadcast address you might want to change that in dhcpcd by using

sudo nano /etc/dhcpcd.conf

then you type this next part

interface wlan0
static ip_address=192.168.x.xxx # the x's mean your own ip address
static routers=(your routers ip address)
static domain_name_servers=127.0.0.1

i would recommend you use localhost(127.0.0.1) for you dns (if you have one)