Re: Sendmail Delivery Options

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#3662

From: Paul Black
Date: Tue, 10 Aug 1999 00:00

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Peter McDermott <peter@petermc.demon.co.uk> wrote:
> Is it essential to firewall my dns? It's not a service
> I would have thought likely to be accessed by outside
> domains?

The firewall isn't to protect DNS, it's to prevent access by your
internal machine/network. The reason I do it is to speed things up
when I'm not connected to the Internet. If DNS is running all the
time, some applications pause while a DNS lookup times out. By
using the following two commands:
/sbin/ipchains -D input -j REJECT -p udp -d gammon domain
/sbin/ipchains -I input -j REJECT -p udp -d gammon domain
I effectively turn off DNS (it's the same as stopping then
starting, only quicker) and it preserves some cached DNS data which
also speeds things up later on (gammon is the gateway machine).

Paul

[comp.mail.sendmail removed from followups]

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<933521112.11557.0.nnrp-10.c2dea8e2@news.demon.co.uk> <m3n1wb7740.meow@hopf.demon.co.uk> <7oeo3j$67e$1@petermc.demon.co.uk> <37AE1557.3D8C3E2F@canix.co.uk> <7on5v1$1d7$1@petermc.demon.co.uk>

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From: Paul Black <paul@canix.co.uk>
Subject: Re: Sendmail Delivery Options
Date: 1999/08/10
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