[Olsr-users] Accepting packets from nodes with very old localtime

Henning Rogge (spam-protected)
Mon May 20 10:15:27 CEST 2013

On Mon, May 20, 2013 at 7:59 AM, Ben West <(spam-protected)> wrote:
> I've been testing a TP-Link TL-MR3020 running OpenWRT Attitude Adjustment
> v12.09, albeit custom compiled to include the recent release olsrd v0.6.5.4.
> This particular device has no internal hardware clock (not unusual for
> low-cost consumer-grade wifi routers), and it does consistently boot up with
> local time at 1 Jan 1970, which I've found causes other nodes to reject its
> OLSR packets.

If I understand the code right the neighbors of the OLSR node should
forget the last stored timestamp after 30 seconds with no valid

> Besides that, is it possible to somehow disable timestamp checking for
> incoming OLSR packets?  Or is this a drawback of using the (now presumably
> outdated) secure plugin?

If you disable the timestamps you will be open to replay attacks,
which are a trivial way to disrupt your network.

The alternative would be to use some kind of linklayer-security, it
would offer you practically the same security for OLSR than the secure
plugin, most likely even more.

Henning Rogge

We began as wanderers, and we are wanderers still. We have lingured
long enough on the shores of the cosmic ocean. We are ready at last to
set sail for the stars - Carl Sagan

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