Sorry. I did not check its preview. I am using the outlook express but I can not find a way to use the fixed-font in the text area. Instead, I add a link of my message in here: http://www.megapass.co.kr/~cychong12/arp_rep Thanks. Chae-yong ----- Original Message ----- From: "Chae-yong Chong" <cychong@samsung.com> To: <linux-net@vger.kernel.org> Sent: Monday, August 12, 2002 1:34 PM Subject: ARP reply on behalf of another interface? > 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. > > - > : send the line "unsubscribe linux-net" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
