[prev in list] [next in list] [prev in thread] [next in thread] 

List:       freebsd-net
Subject:    proxy arp on 8.0-current?
From:       Hiroharu Tamaru <tamaru () myn ! rcast ! u-tokyo ! ac ! jp>
Date:       2009-04-23 12:13:51
Message-ID: sa6ws9ba7pc.wl%tamaru () myn ! rcast ! u-tokyo ! ac ! jp
[Download RAW message or body]

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
_______________________________________________
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"
[prev in list] [next in list] [prev in thread] [next in thread]