Date: Tue, 04 Aug 2009 11:58:34 -0700 From: Xin LI <delphij@delphij.net> To: "Li, Qing" <qing.li@bluecoat.com> Cc: Jack F Vogel <jfv@freebsd.org>, freebsd-net@freebsd.org, d@delphij.net Subject: Re: em(4): sending ARP regardless of NOARP flag Message-ID: <4A7884DA.2020006@delphij.net> In-Reply-To: <B583FBF374231F4A89607B4D08578A4304E98F8C@bcs-mail03.internal.cacheflow.com> References: <4A773D09.3030404@delphij.net> <B583FBF374231F4A89607B4D08578A4304E98F8C@bcs-mail03.internal.cacheflow.com>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Li, Qing wrote: > Is this on -CURRENT ? No, it's 7.2-RELEASE-p2. > --Qing > > >> -----Original Message----- >> From: owner-freebsd-net@freebsd.org [mailto:owner-freebsd- >> net@freebsd.org] On Behalf Of Xin LI >> Sent: Monday, August 03, 2009 12:40 PM >> To: Jack F Vogel >> Cc: freebsd-net@freebsd.org >> Subject: em(4): sending ARP regardless of NOARP flag >> > Hi, Jack, > > I have observed that, even if -arp is specified when adding an IP > address to the em(4) interface, an ARP request is still being sent. > Here is a tcpdump from my network environment: > > 11:15:01.370256 00:13:72:66:b5:d7 > ff:ff:ff:ff:ff:ff, ethertype ARP > (0x0806), length 60: Request who-has *.*.152.120 tell *.*.152.120, > length 46 > 11:15:01.370270 00:15:17:92:39:0e > 00:13:72:66:b5:d7, ethertype ARP > (0x0806), length 42: Reply *.*.152.120 is-at 00:00:5e:00:01:07, length > 28 > > (The first ARP request was sent from a Dell branded Intel 82541EI >> based > NIC, the latter is from a cheaper server that is part of CARP > configuration which is unrelated to the problem in response to the ARP > request) > > I was originally under the impression that there is some bug in our >> ARP > code but with a bce(4) card, the problem does not exist. After a > glance > at e1000 driver code, it looks like that the e1000 NIC has a feature >> of > hardware interception of ARP, can this be somehow connected? The > hardware in question is 82541EI based: > > em1@pci0:7:8:0: class=0x020000 card=0x016d1028 chip=0x10768086 > rev=0x05 > hdr=0x00 > vendor = 'Intel Corporation' > device = '82541EI Gigabit Ethernet Controller' > class = network > subclass = ethernet > > Thanks in advance! > > Cheers, _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" - -- Xin LI <delphij@delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve! -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (FreeBSD) iEYEARECAAYFAkp4hNkACgkQi+vbBBjt66Bo0ACbBWVUdrEmwqaiRUYmezoMukqA lskAnRPsFHa+BssSt4sBnPDKDhj+sczw =dKzv -----END PGP SIGNATURE-----
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