Date: Thu, 23 Apr 2009 21:13:51 +0900 From: Hiroharu Tamaru <tamaru@myn.rcast.u-tokyo.ac.jp> To: freebsd-net@freebsd.org Subject: proxy arp on 8.0-current? Message-ID: <sa6ws9ba7pc.wl%tamaru@myn.rcast.u-tokyo.ac.jp>
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Hi, I'm trying to setup an proxy arp on a dual homed host. I noticed that I cannot set it up on 8.0-current the same way as I could on 6.2; hence the question: have the setup procedure changed recently (when the arp table was separated from the routing table, maybe?)? My 8.0-current is from 200902 snapshot. Here is a simple demonstration using two single-interfaced hosts: setup: host6.2# ifconfig em0 inet 192.168.0.1/24 host6.2# arp -s 192.168.0.11 auto pub host6.2# arp -an | grep permanent ? (192.168.0.1) at 00:16:d3:xx:xx:xx on em0 permanent [ethernet] ? (192.168.0.11) at 00:16:d3:xx:xx:xx on em0 permanent published [ethernet] host6.2# tcpdump -np arp host8.0# ifconfig em0 inet 192.168.0.2/24 host8.0# arp -s 192.168.0.12 auto pub host8.0# arp -an | grep permanent ? (192.168.0.2) at 00:0c:29:xx:xx:xx on em0 permanent [ethernet] ? (192.168.0.12) at 00:0c:29:xx:xx:xx on em0 permanent published [ethernet] host8.0# tcpdump -np arp then, I do: host6.2# arp -d 192.168.0.2; ping -c 1 192.168.0.2 host6.2# arp -d 192.168.0.12; ping -c 1 192.168.0.12 host8.0# arp -d 192.168.0.1; ping -c 1 192.168.0.1 host8.0# arp -d 192.168.0.11; ping -c 1 192.168.0.11 I am not caring about 'arp -d' errors (cannot locate) nor ping not responding (for proxied addresses). I just cared about arp requests and replys for now. The output of tcpdump on both sides are like this: arp who-has 192.168.0.2 tell 192.168.0.1 arp reply 192.168.0.2 is-at 00:0c:29:xx:xx:xx arp who-has 192.168.0.12 tell 192.168.0.1 ---->no reply arp who-has 192.168.0.1 tell 192.168.0.2 arp reply 192.168.0.1 is-at 00:16:d3:xx:xx:xx arp who-has 192.168.0.11 tell 192.168.0.2 arp reply 192.168.0.11 is-at 00:16:d3:xx:xx:xx As you can see from the above, 'arp -s 192.168.0.12 auto pub' on 8.0-current host seems not to be producing proxy arp's. What am I missing? Thanks. -- Hiroharu Tamaru
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