Possible regression in ifconfig under7.0 - removes valid default route

Jo Rhett jrhett at netconsonance.com
Mon Nov 17 13:41:03 PST 2008


This is a bug in my mind, but it's not a regression.  FreeBSD has done  
this for at least 10 years now.  If you are changing the IP of an  
interface, you *must* do a semicolon chained command to a route add  
default.  It's been true for as long as I can remember.

On Nov 17, 2008, at 11:11 AM, Steven Hartland wrote:
> I believe there "may be" a regression in the behaviour of ifconfig or
> possibly just something I've never experienced before.
>
> Basically when changing the IP of one of our machines, it suddenly
> became inaccessible. After some investigation it turned out the  
> machine
> was inaccessible from anything other than the local VLAN and continued
> diagnostics determined that the process of changing the IP had also
> removed the default route.
>
> This was clearly unexpected behaviour as the new IP was on the same
> VLAN as the old IP and hence no routing table updates should be
> required.
>
> I don't have any older machines to test this on but I believe we have
> done this procedure in the past without any such issues so wanted to
> raise it here to see if anyone else has had experience with it.
>
> Even if this isn't a regression it may well be something worth fixing
> as its quite unexpected behaviour which could render a machine totally
> inaccessible.
>
>   Regards
>   Steve
>
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-- 
Jo Rhett
Net Consonance : consonant endings by net philanthropy, open source  
and other randomness




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