> -----Original Message----- > From: David Miller [mailto:davem@xxxxxxxxxxxxx] > Sent: Tuesday, November 28, 2006 2:19 PM > To: timw@xxxxxxxxxxxxx > Cc: shemminger@xxxxxxxx; linux-net@xxxxxxxxxxxxxxx > Subject: Re: Arp undo issue in all 2.4 and 2.6 kernel releases > > From: "Tim Wright" <timw@xxxxxxxxxxxxx> > Date: Tue, 28 Nov 2006 13:19:39 -0800 > > > At the point where the system is responding, there should be no > > interfaces with the given IP address and ifconfig confirms > this. The > > IP address is not associated with any interface and should not be > > associated with the system either. The sequence of events > is "bring up > > the address on one interface, try to bring it up on another alias, > > bring the address down". This isn't an issue of "replying > to ARP out > > the wrong interface", it is replying to arp requests when no > > interfaces on the system have that IP address associated. > > Try "ifconfig -a" as suggested elsewhere, or "ip addr list". > The addresses are still there. > > Bringing and interface down does not delete the IP addresses. > Interfaces are associated with the system, not specific interfaces. > [root@nfstest root]# ip addr list 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 brd 127.255.255.255 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 5: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:80:ad:72:3e:5a brd ff:ff:ff:ff:ff:ff inet 10.12.0.20/16 brd 10.12.255.255 scope global eth0 inet6 fe80::280:adff:fe72:3e5a/64 scope link valid_lft forever preferred_lft forever 6: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000 link/ether 00:80:ad:20:59:8b brd ff:ff:ff:ff:ff:ff 7: eth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000 link/ether 00:01:02:c6:fe:c1 brd ff:ff:ff:ff:ff:ff 8: sit0: <NOARP> mtu 1480 qdisc noop link/sit 0.0.0.0 brd 0.0.0.0 [root@nfstest root]# ping 10.12.0.22 PING 10.12.0.22 (10.12.0.22) 56(84) bytes of data. 64 bytes from 10.12.0.22: icmp_seq=0 ttl=64 time=0.108 ms 64 bytes from 10.12.0.22: icmp_seq=1 ttl=64 time=0.076 ms --- 10.12.0.22 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1000ms rtt min/avg/max/mdev = 0.076/0.092/0.108/0.016 ms, pipe 2 It's not associated with any interface on the system. Please try this yourself. It is trivially reproducible. Thanks, Tim - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
