[LIH] reverse dns

[Dayalan Manohar]

hi,
we have one server running mail and secondary dns, which has no reverse
dns entry.is reverse dns entry required?
regards,
dayalan

[Suresh Ramasubramanian]

Post by Dayalan Manohar
we have one server running mail and secondary dns, which has no reverse
dns entry.is reverse dns entry required?

It is a good thing to have, but not strictly "necessary".

However, do keep in mind that some mailservers (such as those at freebsd.org)
require that the sending IP have reverse DNS. And yahoo was / is thinking of
this measure, from what I read on a list some months back.

So yes, it is an ever increasing necessity, in some cases.

-srs

[Ajay]

Please refer the LOST attached below:

No passwords required for tty4, 5 and 6. But which user
will be logged-in this way? Suppose there are two users on
the box- the root and Ajay?

Ajay Shankar

****************************************************************
EMail Sturmbannfuhrer, Lower Middle Class Unix Sysadmin

[Linux One Stanza Tip]  

[USM Bish]

Post by Ajay
No passwords required for tty4, 5 and 6. But which user
will be logged-in this way? Suppose there are two users on
the box- the root and Ajay?

Once you switch to tty4, 5 or 6 with Alt-Fn or Ctrl-Alt-Fn,
you would get the log-in prompt. You need to type in the
user name viz (root or ajay etc). No password would be nee-
ded thereafter. You would be logged in as per the login id.

HTH

Bish

--
:
####[ Linux One Stanza Tip (LOST) ]###########################

Sub : Best Screen Saver LOST #074

The best screen saver for your system is the Power switch of
your monitor - saves both electricity and phosphor .... Blank
screen at least saves phosphor .... All others save neither !

####<***@nde.vsnl.net.in>####################################
:

[Ajay]

Please refer the LOST attached below:

No passwords required for tty4, 5 and 6. But which user
will be logged-in this way? Suppose there are two users on
the box- the root and Ajay?

Ajay Shankar

****************************************************************
EMail Sturmbannfuhrer, Lower Middle Class Unix Sysadmin

[Linux One Stanza Tip]  

[Arvind]

depends........
some application looks into reverse entry.. some dont.
so, reverse entry is not a must, your DNS will still work without it.

for example

i have a firewall , which allows packets from abc.com only. now, the packets
contain ip addresses, so the firewall will do a reverse lookup for those
IP's and if it resolves to abc.com then it will allow, else it will discard
it.
so the person who is hosting abc.com must have a proper reverse entry, else
the firewall will keep kicking his IPs out.

Arvind
----- Original Message -----
From: "Dayalan Manohar" <***@innomedia.soft.net>
To: <linux-india-***@lists.sourceforge.net>
Sent: Wednesday, April 24, 2002 1:16 PM
Subject: [LIH] reverse dns

Post by Dayalan Manohar
hi,
we have one server running mail and secondary dns, which has no reverse
dns entry.is reverse dns entry required?
regards,
dayalan
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