Messages in this thread | | | Date | Thu, 25 Nov 2010 23:18:35 +0100 | From | Jarek Poplawski <> | Subject | Re: Unplug ethernet cable, the route persists. Why? |
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Ben Gamari wrote: > On Wed, 24 Nov 2010 12:29:43 -0800 (PST), Mike Caoco <caoco2002@yahoo.com> wrote: >> So if you rely on NetworkManager or Connman or Quagga to remove the >> route, the routing daemons will recompute the route table anyway. So >> why cannot this be done in the kernel? > > This is policy. In the Linux world we generally strive to separate > policy from mechanism, leaving the former to userspace. This allows > (potentially complex) policy decisions to be made in user-space. The > reason for this is two-fold: First, every line of kernel code introduces > the potentially for a bug and error handling in the kernel is generally > more complex than it is in user-space. Secondly, allowing user-space to > handle policy allows users to do things with the kernel that kernel > developers did not envision. This flexibility is one reason why the > kernel is so suited for running on anything from your cell-phone to 4000 > processor big iron.
Secondly and a half, if you add a specific route you may really mean it, and prefer not to send at all than use default.
Cheers, Jarek P.
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