Disable ns reverse lookup for telnet

[Kevin Darcy]

Since 172.24.50.78 is in the private (RFC 1918) address range, you'll need to
set up a 24.172.in-addr.arpa zone internally. Doing so will speed up reverse
resolution and should obviate the need for (I wish "denecessitate" were a
real word in English!) attempting to disable the reverse lookup function of
the telnet server.

If you've already done this step, then obviously something is wrong with your
nameserver setup because you shouldn't be getting delays. In that case, more
details about the nameserver setup are necessary.


- Kevin

Diego Balgera wrote:

> Hi,
> when I telned an host, its telnet daemon performs a reverse lookup to know
> the name of the telnetter. This cause a certain delay to have the prompt,
> and sometimes the connection fails.
> Do you know how to disable this? Note that the dns must stay enabled in
> nsswitch.conf, otherwise that host won't use the dns anymore, and it is
> needed for other purposes.
>
> For example: the telnetter is 172.24.50.78, I need to disable the query to
> 78.50.24.172.in-addr.arpa (as stated below).
> Nov 19 17:08:14 nut named[23358]:
> XX+/192.168.176.13/78.50.24.172.in-addr.arpa/PTR/IN
>
> The environment: linux mandrake 7.1.
>
> Any idea?
> Thank you in advance.
> Diego.