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

[Thomas Graf]

* Tim Wright <timw@xxxxxxxxxxxxx> 2006-12-01 14:27
> > [root@nfstest root]# strace -e ioctl ifconfig eth0:5 
> > 10.12.0.22 netmask 255.255.0.0 up
> > ioctl(4, 0x8916, 0xbfb15440)            = 0
> > ioctl(4, 0x8913, 0xbfb15370)            = 0
> > ioctl(4, 0x8914, 0xbfb15370)            = 0
> > ioctl(4, 0x891c, 0xbfb15440)            = 0
> > ioctl(4, 0x8913, 0xbfb15370)            = 0
> > ioctl(4, 0x8914, 0xbfb15370)            = 0
> > [root@nfstest root]# strace -e ioctl ifconfig eth0:6 
> > 10.12.0.22 netmask 255.255.0.0 up
> > ioctl(4, 0x8916, 0xbfc835b0)            = 0

SIOCSIFADDR returns 0 because 10.12.0.22 is already the local address

> > ioctl(4, 0x8913, 0xbfc834e0)            = 0

SIOCGIFFLAGS returns the current interface flags

> > ioctl(4, 0x8914, 0xbfc834e0)            = 0

SIOCSIFFLAGS returns 0, eth0 is already up and running

> > ioctl(4, 0x891c, 0xbfc835b0)            = 0

SIOCSIFNETMASK returns 0, 255.255.0.0 is already the netmask of
the configured local address

> > ioctl(4, 0x8913, 0xbfc834e0)            = 0

SIOCGIFFLAGS returns the current interface flags again

> > ioctl(4, 0x8914, 0xbfc834e0)            = -1 EADDRNOTAVAIL (Cannot
> > assign requested address)
> > SIOCSIFFLAGS: Cannot assign requested address

The first SIOCSIFFLAGS was on device level, this SIOCSIFFLAGS is
for AF_INET and fails because there is no local address 10.12.0.22
with a label eth0:6. The configured local address 10.12.0.22 has
the label eth0:5.
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