You can configure both NIC as /32. You also need proxy arp installed and listen on both NIC. Then the traffic should be able to follow between two NICs. Since Proxy ARP always answers its MAC to clients, so the clients can always send traffic to em1 or em0. Based on client's mac entry in the ARP table, client to client traffic is easily transferred. Other traffic should be able to direct to default gateway.
I gave this a shot and failed miserably. Admittedly, I know little-to-nothing about arp, so hopefully it's obvious why I failed.
I have this in my /etc/rc.conf: network_interfaces="fxp0 fxp1 lo0" ifconfig_fxp0="inet 10.0.0.4 netmask 255.255.255.255 link0" ifconfig_fxp1="inet 10.0.0.5 netmask 255.255.255.255 link0" defaultrouter="10.0.0.1"
Created an arp table file called /etc/arp.table (built-in dual fxps so the macs are actually consecutive):
10.0.0.4 00:01:02:03:04:06 pub
10.0.0.5 00:01:02:03:04:05 pub
And had this in /etc/rc.local: /usr/sbin/arp -f /etc/arp.table
On boot I ended up with the following error message and a blank arp table: set: proxy entry exists for non 802 device
Do I need to add in some static routes to make this work? What am I missing?
Would this make it possible to have each adapter/IP use a different gateway? I ask because I have 2 T1s and I'm curious if a single machine could utilize both. It's an SMP box so I was thinking of running 2 peered instances of Squid on separate IP addresses with each IP address using one of the T1s as the gateway. That way I could force my power users through one connection and everyone else through the other while still gaining the benefit of caching everything for everyone. It's probably needlessly complicated, but it sounds fun... ;-)
Jon
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Xin LI Sent: Tuesday, February 01, 2005 10:12 AM To: freebsd-net@freebsd.org Subject: Two NIC's connected to same subnet: routing question
Dear folks,
I think I got confused with the routing problem we will have when at least two NIC's are connected into the same subnet.
The scenario: em0: 192.168.0.1/24 em1: 192.168.0.2/24
We can't simply configure like this, since 192.168.0.0/24 network route exists as soon as either em0 or em1 is up. A workaround for this is that we assign 192.168.0.2/32 for em1, but that has another issue that all traffics will go through em0 for "outgoing", say, outside the current network.
A google of the issue has indicated that the "Move ARP out of routing table" work done last April should have resolved this, as "With this change it is possible to have more than one interface in the same IP subnet and layer 2 broadcast domain.". However, what I have found from our mailing list archive says only to assign /32 IP address, or remove routing item from route table, which is essentially identical to the /32 solution.
So is there any way to utilize the both NIC's? I think I have been confused :-(
Cheers, -- Xin LI <delphij delphij net> http://www.delphij.net/
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