[maemo-developers] Localhost unavailable when wi-fi offline or not connected

[From: Patrik Flykt]

	Hi,

On Wed, 2007-05-02 at 07:10 -0500, ext David Hagood wrote:
>  Outbound packet detected with interface down

This has one additional problem: The packets sent to the dummy interface
will vanish and not be re-routed to the new interface once it's up. If
the packets were meant for DNS, the application most likely would end up
with a "host not found" while the connection would still be connecting
in the background. If the device should not have DNS packets triggering
connection creation there are problems as all applications do their name
resolution before they actually connect, so nobody would be able to
connect. In order to fix this, the device could of course implement its
own DNS resolver, which would signal with the connectivity subsystem to
get the interface up. Usually any delay in name resolution keeps the
application in a frozen state, as name resolution is expected to be a
fairly quick operation. If we don't mind name resolution triggering
connection creation or a "host not found" error every now and then then
this is not a showstopper.

>  More than $TIME has elapsed without an outbound packet.

That we basically have with the idle timer settings and iptables.

> Signals the kernel to retry the packet

Hmm, is this possible with recent kernels? What about those packets to
DNS and elsewhere whose state in the application has already timed out?


Regards,

	PAtrik


-- 
Patrik Flykt <Patrik.Flykt at nokia.com>