A solution for multiple routes (usb0+eth0)
helge.hafting at hist.no
Mon Mar 9 10:51:52 CET 2009
Bringing up one interface creates a default route, which is necessary no
matter which interface is used.
Bringing up both interfaces makes two default routes, and there is the
risk that the phone ends up using the slower interface which obviously
is a problem.
I set up /etc/network/interfaces like this, adapted from SHR:
iface usb0 inet static
gateway 192.168.0.200 metric 1
up echo nameserver 22.214.171.124 >> /etc/resolv.conf
up echo nameserver 126.96.36.199 >> /etc/resolv.conf
The "metric" does the trick. When usb0 is the only interface, the usb0
route gets used as usual.
If some other interface comes up (in my case, eth0)
then that one gets a default route too, but that default route
comes up with the default metric of 0.
So, the eth0 default route is seen as "shorter", and is preferred over
usb0 when both are available. Which is good, as eth0 is faster.
So, no need to delete the usb0 default route when bringing up other
interfaces, with the associated problem of restoring the usb0 route when
the other interface goes away.
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