Date: Tue, 21 Jun 2016 11:25:38 +0200 From: Michael Gmelin <freebsd@grem.de> To: freebsd-net@freebsd.org Cc: stdin@niklaas.eu Subject: Re: ARP table entries / ifconfig needs to be issued twice when moving IP Message-ID: <20160621112538.784e7b6e@bsd64.grem.de> In-Reply-To: <20160621064800.GB8441@box-hlm-03.niklaas.eu> References: <20160621064800.GB8441@box-hlm-03.niklaas.eu>
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> Reminds me of what I encountered recently with two virtual > machines at my provider. I haven't further dug into this, as > I didn't check `arp -an`, but what I saw was switching an IP > address from hosts A to B resulted in pings from host C to arrive > at A. Host C said they got lost while tcpdump showed incoming > packets at A although they should have gone to B. As the packets came from host C, this is expected behaviour. Host C had the ARP entry cached (or if it wasn't on the same network, some network equipment had). What I'm describing is the machine having the IP address configured not creating a permanent entry in the local ARP table for its own interface. - Michael -- Michael Gmelin
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