> -----Original Message----- > From: Brian Haley [mailto:brian.haley@xxxxxx] > Sent: Tuesday, November 28, 2006 1:48 PM > To: Tim Wright > Cc: Stephen Hemminger; linux-net@xxxxxxxxxxxxxxx > Subject: Re: Arp undo issue in all 2.4 and 2.6 kernel releases > > Tim Wright wrote: > > 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. > > At no point did you *delete* the address, it's still there. > # ifconfig -a > > -Brian > Yes I did. One of the steps is 'ifconfig eth0:5 down'. That removes the address. Here's a capture of running the commands on a CentOS 3 box. The same things happen running 2.6.18. Please note that at the end NO interfaces on the machine claim to own the 10.12.10.22 address, but the machine still merrily responds to arp requests (I know I did the ping locally, but if I do it from another machine, you can see the server respond to the arp request in tcpdump/ethereal). [root@nfstest root]# ifconfig eth0 Link encap:Ethernet HWaddr 00:80:AD:72:3E:5A inet addr:10.12.0.20 Bcast:10.12.255.255 Mask:255.255.0.0 inet6 addr: fe80::280:adff:fe72:3e5a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:391347 errors:0 dropped:0 overruns:0 frame:0 TX packets:75 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:29269574 (27.9 Mb) TX bytes:6883 (6.7 Kb) Interrupt:9 Base address:0x2400 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:450 errors:0 dropped:0 overruns:0 frame:0 TX packets:450 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:89849 (87.7 Kb) TX bytes:89849 (87.7 Kb) [root@nfstest root]# ping 10.12.0.22 PING 10.12.0.22 (10.12.0.22) 56(84) bytes of data. --- 10.12.0.22 ping statistics --- 2 packets transmitted, 0 received, 100% packet loss, time 999ms [root@nfstest root]# ifconfig eth0:5 10.12.0.22 netmask 255.255.0.0 up [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=0.141 ms 64 bytes from 10.12.0.22: icmp_seq=1 ttl=64 time=0.064 ms --- 10.12.0.22 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 999ms rtt min/avg/max/mdev = 0.064/0.102/0.141/0.039 ms, pipe 2 [root@nfstest root]# ifconfig eth0:6 10.12.0.22 netmask 255.255.0.0 up SIOCSIFFLAGS: Cannot assign requested address [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=0.094 ms --- 10.12.0.22 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.094/0.094/0.094/0.000 ms, pipe 2 [root@nfstest root]# ifconfig eth0 Link encap:Ethernet HWaddr 00:80:AD:72:3E:5A inet addr:10.12.0.20 Bcast:10.12.255.255 Mask:255.255.0.0 inet6 addr: fe80::280:adff:fe72:3e5a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:391665 errors:0 dropped:0 overruns:0 frame:0 TX packets:168 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:29294000 (27.9 Mb) TX bytes:20141 (19.6 Kb) Interrupt:9 Base address:0x2400 eth0:5 Link encap:Ethernet HWaddr 00:80:AD:72:3E:5A inet addr:10.12.0.22 Bcast:10.255.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:9 Base address:0x2400 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:458 errors:0 dropped:0 overruns:0 frame:0 TX packets:458 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:90577 (88.4 Kb) TX bytes:90577 (88.4 Kb) [root@nfstest root]# ifconfig eth0:5 down [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=0.091 ms 64 bytes from 10.12.0.22: icmp_seq=1 ttl=64 time=0.080 ms --- 10.12.0.22 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1000ms rtt min/avg/max/mdev = 0.080/0.085/0.091/0.010 ms, pipe 2 [root@nfstest root]# ifconfig eth0 Link encap:Ethernet HWaddr 00:80:AD:72:3E:5A inet addr:10.12.0.20 Bcast:10.12.255.255 Mask:255.255.0.0 inet6 addr: fe80::280:adff:fe72:3e5a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:391809 errors:0 dropped:0 overruns:0 frame:0 TX packets:222 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:29305303 (27.9 Mb) TX bytes:28601 (27.9 Kb) Interrupt:9 Base address:0x2400 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:462 errors:0 dropped:0 overruns:0 frame:0 TX packets:462 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:90913 (88.7 Kb) TX bytes:90913 (88.7 Kb) [root@nfstest root]# ifconfig -a eth0 Link encap:Ethernet HWaddr 00:80:AD:72:3E:5A inet addr:10.12.0.20 Bcast:10.12.255.255 Mask:255.255.0.0 inet6 addr: fe80::280:adff:fe72:3e5a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:391836 errors:0 dropped:0 overruns:0 frame:0 TX packets:235 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:29307303 (27.9 Mb) TX bytes:31091 (30.3 Kb) Interrupt:9 Base address:0x2400 eth1 Link encap:Ethernet HWaddr 00:80:AD:20:59:8B BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:10 Base address:0x2800 eth2 Link encap:Ethernet HWaddr 00:01:02:C6:FE:C1 BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:9 Base address:0x2000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:462 errors:0 dropped:0 overruns:0 frame:0 TX packets:462 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:90913 (88.7 Kb) TX bytes:90913 (88.7 Kb) sit0 Link encap:IPv6-in-IPv4 NOARP MTU:1480 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) - 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
