Re: Arp undo issue in all 2.4 and 2.6 kernel releases

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* Tim Wright <timw@xxxxxxxxxxxxx> 2006-11-28 14:51
> [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.

The list of addresses really doesn't matter, it's the local route
that is relevant for arp and therefore the route cache which may
for some reason not be flushed in your case. Therefore please
provide exact kernel version, contents of the local table, eventual
routing rules(!) and list the route cache ("ip r l c")

Use of interface aliases via ifconfig is deprecated and thinking
in terms of putting a interface alias "up" or "down" is dangerous
because what you really do is adding/removing secondary addresses.
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