Date: Tue, 4 Aug 2009 10:11:54 -0700 From: Jack Vogel <jfvogel@gmail.com> To: d@delphij.net Cc: Jack F Vogel <jfv@freebsd.org>, freebsd-net@freebsd.org Subject: Re: em(4): sending ARP regardless of NOARP flag Message-ID: <2a41acea0908041011kaba6ab0ra6fec3b309fc42ef@mail.gmail.com> In-Reply-To: <4A773D09.3030404@delphij.net> References: <4A773D09.3030404@delphij.net>
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I don't see how arping or not can be a driver problem, the driver just sends packets queued by the stack, there exists NO mechanism to communicate that kind of thing down into the driver, -arp is something that must be negotiated in the stack somewhere, as for it working with broadcom... <shrugs> Jack On Mon, Aug 3, 2009 at 12:39 PM, Xin LI <delphij@delphij.net> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > 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, > - -- > Xin LI <delphij@delphij.net> http://www.delphij.net/ > FreeBSD - The Power to Serve! > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.12 (FreeBSD) > > iEYEARECAAYFAkp3PQkACgkQi+vbBBjt66A2CQCgt+8prSPRDKdOb61gdfj1zpcF > q28An1/UXuo0bcEi4nwlUpYuqD8hR5Lo > =56SA > -----END PGP SIGNATURE----- >
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