Date: Fri, 13 Sep 2002 09:17:02 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Gordon Tetlow <gordont@gnf.org> Cc: net@FreeBSD.org, dillon@FreeBSD.org Subject: Re: ARP move hangs NFS mount Message-ID: <15745.58702.945886.573972@grasshopper.cs.duke.edu> In-Reply-To: <20020912181509.GY42734@roark.gnf.org> References: <20020912181509.GY42734@roark.gnf.org>
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Gordon Tetlow writes: > I see this behavior on 4.6.1-RELEASE-p10: > > I have an EMC IP4700 NAS with 2 heads. On one head I have an active NFS share > that is being used by my FreeBSD webservers for content. When I reboot the > head that is actively hosting the NFS share, the other head arps up and takes > over the ip address of the head that just rebooted. My FreeBSD webservers see > the arp move but hang the NFS mount until the I reinstate the other head. As > a comparison, I tried this on a linux box and it continued along without a > hitch. Any ideas? I'll bet that when the second head takes over, it replies using its own IP address, rather the IP address of the head that it took over from. There's something about the FreeBSD NFS client implementation which requires that if you make an NFS request to a certain IP address, the reply MUST return from that same IP address. Otherwise, the reply will be ignored. Matt -- Do you know off the top of your head what makes this happen? While I realize that its a security feature, its caused me no end of suffering at two different sites, and I'd really like to know how to disable it! ;) Thanks, Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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