From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Haley Subject: Re: How to make stack send broadcast ARP request when entry is STALE? Date: Fri, 07 Nov 2014 10:54:30 +0100 Message-ID: <545C96D6.5020204@hp.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: Netdev To: Ulf samuelsson Return-path: Received: from g9t1613g.houston.hp.com ([15.240.0.71]:52166 "EHLO g9t1613g.houston.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751255AbaKGJye (ORCPT ); Fri, 7 Nov 2014 04:54:34 -0500 Received: from g6t1526.atlanta.hp.com (g6t1526.atlanta.hp.com [15.193.200.69]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by g9t1613g.houston.hp.com (Postfix) with ESMTPS id 0602460C86 for ; Fri, 7 Nov 2014 09:54:34 +0000 (UTC) In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: On 11/05/2014 07:48 AM, Ulf samuelsson wrote: > Have a problem with an HP router at a certain location, which > is configured to only answer to broadcast ARP requests. > That cannot be changed. Sorry to hear about the problem, but my only suggestions would be to try the latest firmware and/or put a call in to support. I don't happen work in the division that makes routers... > The first ARP request the kernel sends out, is a broadcast request, > which is fine, but after the reply, the kernel sends unicast requests, > which will not get any replies. You might be able to hack this by inserting an ebtables rule - check the dnat target section of the man page - don't know the exact syntax but it would probably end in '-j dnat --to-destination ff:ff:ff:ff:ff:ff' -Brian