Restoring /etc/resolv.conf after a modem/router burp

[Robert Brockway]

On Mon, 13 Jun 2005, Lennart Sorensen wrote:

> dhclient has options for dhclient.conf to make it not touch resolv.conf,
> pump and dhcpcd both have command line options to leave resolv.conf
> alone.

If all else fails there is always chattr if the filesystem supports it.

Some years ago I had to deal with a closed-source connection binary (for 
Linux) for a propriatory protocol used for connection to the ISP (amazing 
huh).  It insisted on changing /etc/resolv.conf, gave no option to disable 
this behaviour and would even ignore a chmod and change the file anyway.  

In the end I made /etc/resolv.conf immutable using chattr[1].  Ext2/3 and 
recent version of XFS support chattr functionality.

[1] chattr +i

Rob

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Robert Brockway B.Sc.
Senior Technical Consultant, OpenTrend Solutions Ltd.
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