Date: Wed, 13 Feb 2013 12:55:05 -0800 From: Chuck Swiger <cswiger@mac.com> To: Jin Guojun <jguojun@sbcglobal.net> Cc: questions freebsd <questions@freebsd.org> Subject: Re: Why ue0 do ARP on non local address when using static route? Message-ID: <4A4F390A-3F42-41ED-9D19-EB4CE20DB148@mac.com> In-Reply-To: <1360787737.17354.YahooMailRC@web180906.mail.ne1.yahoo.com>
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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, -- -Chuckhelp
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