Date: Wed, 13 Feb 2013 14:17:21 -0800 (PST) From: Jin Guojun <jguojun@sbcglobal.net> To: Chuck Swiger <cswiger@mac.com> Cc: questions freebsd <questions@freebsd.org> Subject: Re: Why ue0 do ARP on non local address when using static route? Message-ID: <1360793841.81458.YahooMailRC@web180902.mail.ne1.yahoo.com> In-Reply-To: <4A4F390A-3F42-41ED-9D19-EB4CE20DB148@mac.com> References: <1360787737.17354.YahooMailRC@web180906.mail.ne1.yahoo.com> <4A4F390A-3F42-41ED-9D19-EB4CE20DB148@mac.com>
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/etc/ethers does not help because there is no way resolve the IP by QFHN in ethers. The correct way is to use router IP (10.234.37.1) between 10.234.37.0 and 10.227.148.0 instead of interface IP (10.234.37.80) for static route. ________________________________ From: Chuck Swiger <cswiger@mac.com> To: Jin Guojun <jguojun@sbcglobal.net> Cc: questions freebsd <questions@freebsd.org> Sent: Wed, February 13, 2013 12:55:07 PM Subject: Re: Why ue0 do ARP on non local address when using static route? On Feb 13, 2013, at 12:35 PM, Jin Guojun wrote: > When attached a Trendent TU2-ET100 USB Ether dongle for a second interface, it > has no problem to talk to the local network (10.234.37.0/24), but it has >problem > > to talk to a remote network or host (10.227.148.0/24) via eu0 interface. > When a remote host ping this host or this host ping that remote host, ARP > request is always showing up. > A static route is set and remote host is no part of the local sub net, why ARP > is going on? You've told the interface that it can reach 10.227.148.52 via 10.234.37.80, which is the IP ue0 was configured to use. It sends ARPOP_REQUESTS to get the MAC address of 10.227.148.52 which is expected to be reachable. > Is any sysctl parameter can fix this problem? You can do things like use proxy-arp, or setup /etc/ethers, or NAT, or even configure ue0 to be on the same subnet as 10.227.148.52 instead, perhaps using an alias. Regards, -- -Chuck From owner-freebsd-questions@FreeBSD.ORG Wed Feb 13 22:38:48 2013 Return-Path: <owner-freebsd-questions@FreeBSD.ORG> Delivered-To: questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 1D9A0BEE for <questions@freebsd.org>; Wed, 13 Feb 2013 22:38:48 +0000 (UTC) (envelope-from freebsd-questions-local@be-well.ilk.org) Received: from be-well.ilk.org (be-well.ilk.org [23.30.133.173]) by mx1.freebsd.org (Postfix) with ESMTP id E77B3355 for <questions@freebsd.org>; Wed, 13 Feb 2013 22:38:47 +0000 (UTC) Received: from lowell-desk.lan (lowell-desk.lan [172.30.250.41]) by be-well.ilk.org (Postfix) with ESMTP id 1DF3E33C1E; Wed, 13 Feb 2013 17:38:42 -0500 (EST) Received: by lowell-desk.lan (Postfix, from userid 1147) id 4976039843; Wed, 13 Feb 2013 17:38:41 -0500 (EST) From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: Jin Guojun <jguojun@sbcglobal.net> Subject: Re: Why ue0 do ARP on non local address when using static route? References: <1360787737.17354.YahooMailRC@web180906.mail.ne1.yahoo.com> Date: Wed, 13 Feb 2013 17:38:41 -0500 In-Reply-To: <1360787737.17354.YahooMailRC@web180906.mail.ne1.yahoo.com> (Jin Guojun's message of "Wed, 13 Feb 2013 12:35:37 -0800 (PST)") Message-ID: <44halfg7pq.fsf@lowell-desk.lan> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain Cc: questions freebsd <questions@freebsd.org> X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list Reply-To: freebsd-questions@freebsd.org List-Id: User questions <freebsd-questions.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>; List-Post: <mailto:freebsd-questions@freebsd.org> List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=subscribe> X-List-Received-Date: Wed, 13 Feb 2013 22:38:48 -0000 Jin Guojun <jguojun@sbcglobal.net> writes: > This is 8.3-Release on a HP EliteBook 8460p (4-core i5) with an on board Intel > (em0) interface. > When attached a Trendent TU2-ET100 USB Ether dongle for a second interface, it > has no problem to talk to the local network (10.234.37.0/24), but it has problem > to talk to a remote network or host (10.227.148.0/24) via eu0 interface. > When a remote host ping this host or this host ping that remote host, ARP > request is always showing up. > A static route is set and remote host is no part of the local sub net, why ARP > is going on? > > Is any sysctl parameter can fix this problem? Until we know what the problem is, we can't guess at the solution. You didn't show the commands you used, for setting up the routes *or* for the diagnostic information you provided. > -Jin > > > Internet: > Destination Gateway Flags Refs Use Netif Expire > default 10.234.16.1 UGS 0 2841993 em0 > 10.227.148.52 10.234.37.80 UHS 0 26 ue0 There's no "G" in the flags there. Sign of a problem. > 10.234.16.0/22 link#1 U 0 0 em0 > 10.234.17.41 link#1 UHS 0 0 lo0 > 10.234.37.0/24 link#8 U 0 3 ue0 > 10.234.37.80 link#8 UHS 0 0 lo0 That's the gateway address. What's it doing with a host route on the loopback interface? That will override the 10.234.37.0/24 interface route, and turn 10.234.37.80 into a "black hole." - Lowell
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