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

[Tim Wright]

> -----Original Message-----
> From: Thomas Graf [mailto:tgraf@xxxxxxx] 
> Sent: Friday, December 01, 2006 2:42 PM
> To: Tim Wright
> Cc: David Miller; shemminger@xxxxxxxx; linux-net@xxxxxxxxxxxxxxx
> Subject: Re: Arp undo issue in all 2.4 and 2.6 kernel releases
> 
> * 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
> > > ioctl(4, 0x8913, 0xbfc834e0)            = 0
> > > ioctl(4, 0x8914, 0xbfc834e0)            = 0
> > > ioctl(4, 0x891c, 0xbfc835b0)            = 0
> > > ioctl(4, 0x8913, 0xbfc834e0)            = 0
> > > ioctl(4, 0x8914, 0xbfc834e0)            = -1 EADDRNOTAVAIL (Cannot
> > > assign requested address)
> > > SIOCSIFFLAGS: Cannot assign requested address
> > > 
> > > I am grabbing the ifconfig source to try to see exactly what they 
> > > are doing.
> > 
> > Very odd.
> > 
> > That's SIOCSIFADDR, SIOCGIFFLAGS, SIOCSIFFLAGS followed by 
> > SIOCSIFNETMASK, SIOCGIFFLAGS, SIOCSIFFLAGS.
> > Apparently, the set address succeeds, and things only blow 
> up when it 
> > attempts to set the interface flags for the second time.
> 
> The preferred source address for local routes should always 
> equal the local address of the interface address it is based 
> on therefore the output you listed in a previous post seems 
> indeed odd.
> 
> I'm off for the weekend but I'll have a look at it when I get 
> back on monday if you didn't manage to solve it by then. 
> 

Thanks Thomas,
I'll keep plugging away at it :-)

Tim
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