Hi,
I have a system which use IPOA for internal communication while use the
ethernet interface on a node.
+---------------------------------+---------
| +----+ +----+ |
+------- | A | ---------| B |----+
+----+ +----+
eth0 atm0 atm0 eth0
1.1/24 1.2 1.3 1.4
I setup the IP address for each interface with the same subnet /24.
When a remote node send ICMP request to IP address 1.3, the packets
are routed through the eth0(1.4) and reach at the atm0(1.3) because
the eth0 acts as a proxy ARP(It responsed to ARP request which query
the 1.3's hardware address)
>From this, I guess the Linux arp reply to the ARP request which query
one of its interface whether it is a in-device or not.
However, in this figure
+--------------------+---------
| +------+ |
+---- | A |----+
+------+
eth0 eth1
1.1/24 1.4
if a ARP request for 1.1 is broadcasted in the link, the ARP request packet will
get into A through eth0 and through eth1. However, only one ARP reply will
be sent. Why? If eth1 will do act as a proxy ARP for eth0, should the eth1 also
send the ARP reply?(I know the linux not the eth? process/reply ARP packet,
However the linux arp is stateless, the ARP request from eth0 and eth1 just
differ in in-device. I assume this in-device is not important from the previous
test).
Why the eth1 does not send ARP reply for eth0?
In brief, what condition does linux kernel send ARP reply?
Thanks.
Chae-yong.
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