DNS regex lookup

[jabr at blu.org (John Abreau)]

Gordon Keegan <gmkeegan at yahoo.com> writes:

> You used to be able to use nslookup:
> 
> # nslookup
> Server a.b.c.d
> 
>  ls -d domain.com > outfile.txt
>  ####### (x records received)
> 
>  exit
> 
> # more outfile.txt
> 
> But the current versions of nslookup that I've tried
> in RedHat and Mandrake say that nslookup is deprecated
> and to use host or dig.  The help/man page for dig
> looks like you might be able to get the same info, but
> it might take some , um, digging. (sorry...)

I hadn't realized ls had been removed from nslookup. I just tried it
and got

    The 'ls' command is not implemented.

In the old days, DNS was considered public information, like the phone 
book; nobody bothered to restrict zone transfers back then. These days 
it's common to block zone transfers in an attempt to make things harder 
for the spammers and script kiddies.

The host command has a "-l" option to do the "ls" function. However, 
if the DNS server in question doesn't let your client machine do zone
transfers, the "-l" will just get you an error:

    Host blu.org not found: 5(REFUSED)

And thanks to the spammers and script kiddies, this is now the common case.


-- 
John Abreau / Executive Director, Boston Linux & Unix 
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