Re: ARP MESSAGES FILLING CONSOLE

Jeff at NorrisTechs <jeff@xxxxxxxxxxxxxxx> · Thu, 19 Jan 2006 17:52:17 -0700

Thanks.. saved me some frustration and also not filling up the syslog 
either.
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Edinilson J. Santos wrote:
Try to use in sysctl.conf
net.link.ether.inet.log_arp_wrong_iface=0

Edinilson
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----- Original Message ----- 
From: "Jeff at NorrisTechs" <jeff@xxxxxxxxxxxxxxx>

To: "FreeBSD ISP" <freebsd-isp@xxxxxxxxxxx>

Sent: Monday, January 16, 2006 10:49 PM

Subject: ARP MESSAGES FILLING CONSOLE

Everyone,
First off, no attitude or sarcasm g;
After running BSD since 4.0 I have come to love the feature rich set it 
offers and stability as well.
I have an interesting network situation.  I have several BSD based 
servers which are multi-hone (Two Nics) one Nic faces the internet, the 
other faces a PRIVATE IP subnet and wireless DMZ.  However since the 
internet router is also the end point for the wireless DMZ I get a 
barrage of ARP messages indicating the the private nic is receiving ARP 
for the public network and vice versa.
Heres a ascii drawing of whats going on. (example we will say that 
10.0.0.0/8 is the public side and 192.168.100.0/24 is the private side)
(INTERNET)  10.0.0.0/8  (again an exmple)
   !
   !
   v
ROUTER -----> (10.0.0.1/8)<-> WIRELESS (DMZ)  192.168.100.2/24 Connect 
to Client AP below

   !  BSD-1  10.0.0.200/8 (FXP0)

   !

   !

10.0.0.5/8

 (NAT BOX)

  !

  !

  ! BSD-1  192.168.100.200/24  (XL0)

PRIVATE 192.168.100.24 (NAT IP for PC etc)

 !

 !--------(CLIENT AP) 192.168.100.5----------------^Connected to above AP

 (Wireline to client AP 192.168.1.0/24)

Now BSD1  FXP0 (public) and XL0 (priate) are connected together to 
common Layer network, not looped on a Layer2 level otherwise the network 
would crash, but both NICs are connect in a broadcast domain.

If I down XL0 of course everthing is cool , and no ARP messages, but the 
XL0 nic is used for management traffic.
I could either put a router between the Client AP and the router-wireles 
DMZ or leave XL0 down.

Move the client AP to the DMZ side and multinet the NAT box (all ready 
done this) but NAT gets in the way for several applications (remote 
server management)
I would like to know if at all possible to disable ARP requests per NIC, 
make static entiries that override any manual ARP request.

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Re: ARP MESSAGES FILLING CONSOLE

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