From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lewis G Rosenthal Date: Fri, 15 Feb 2019 21:23:06 +0000 Subject: Re: ARP flux vs. weak/strong ES model Message-Id: <5C672DBA.5070507@2rosenthals.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org Hi, Erik... Erik Auerswald wrote: > Hi, > > On 2/14/19 17:21, Grant Taylor wrote: >> On 02/14/2019 01:31 AM, Erik Auerswald wrote: > Linux's cavalier default behaviour in answering ARP requests might be > motivated by the weak ES model in helping other systems on the LAN > reach the Linux server, even if they use an IP address assigned to > another LAN the Linux server is connected to. Thus the problem of "ARP > flux" is probably closely related to how Linux implements the weak ES > model, but not necessarily to the weak ES model itself as described in > RFC 1122. > > Thus I argue that using "ARP flux" to describe the ARP problem > observed with Linux is preferable to attributing the problems to > Linux's implementation of the weak ES model. > > Please note that I have not searched for the origin or an > authoritative source on "ARP flux", and cannot guarantee that it is > indeed consistently used to describe the aforementioned problem. But > it did turn up on related web searches, and seems to directly refer to > the ARP problem at hand. > > Sorry for being pedantic. > Thanks so much for a very cogent explanation of the difference. I'd been meaning to do some digging since spying this thread scrolling by. One of the things I like best about this list is the way it makes me scratch my head. Usually, someone else comes up with a good answer before I'm done scratching, which is another thing I like. :-) Some interesting discussion of the Linux ARP flux problem, here (2.1.4 et seq): http://linux-ip.net/html/ether-arp.html Linked from there, and perhaps relevant to the original problem: http://ja.ssi.bg/#iparp (I guess I should probably push those to the original thread.) -- Lewis ------------------------------------------------------------- Lewis G Rosenthal, CNA, CLP, CLE, CWTS, EA Rosenthal & Rosenthal, LLC www.2rosenthals.com visit my IT blog www.2rosenthals.net/wordpress -------------------------------------------------------------