netdev - Interface working only after first packet is sent out ...

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Message-ID: <CAF6-1L4H7AtT0OP4C0E1wHdrRs+T0r9Qv17wDntZsnJbYv9xaQ@mail.gmail.com>
Date:	Thu, 13 Sep 2012 11:48:06 +0200
From:	Sylvain Munaut <s.munaut@...tever-company.com>
To:	netdev <netdev@...r.kernel.org>
Subject: Interface working only after first packet is sent out ...

Hi,

I've been having an issue for a fairly long time, on several system
(either physical or virtual machine).

Basically I don't have network connectivity until the machine
initiates it's first packet out.

So let's say I just booted the machine (and it has no sw running on
it, just base system), if I try to ping it, it won't respond.
In a tcpdump on the interface, I can see the incoming ping, but not
outgoing responses.

Now from the machine itself, I generate a single ping to anywhere,
then everything will start working as expected and it will last
forever until the next reboot.

Has anyone ever seen something like this ?

Most of the time I don't notice it because either it's a desktop
machine and then even just a DHCP request makes it work from boot, or
even on server, the ntp daemon generates the first packet and it
works.

I don't know if it's a bug or if I'm doing something wrong somewhere,
but I really don't see what it could be ....

Cheers,

    Sylvain
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