Caros Amigos,

Tenho tentado resolver o problema com o Mandriva2006, em relação ao
envio de emails pela rede local através dos clientes windows com
outlook, mas até o momento não consegui, mesmo com as dicas do pessoal
da lista.

Provavelmente, limitação de meus conhecimentos e entendimentos ainda
no mundo linux.

Mesmo assim, recorro novamente a paciência de todos para mais algumas
dicas para tentar resolver o referido problema.

Aparentemente o problema está se dando no iptables. Tentei adaptá-lo à
minhas necessidades de liberação de portas tais como pop (110), smtp
(25) ,ssh(23) e ftp(21) mas obtive mensagens de erro após startar o
serviço.

Segue descrição do iptables que está em uso para que alguém possa me
dar alguma ajuda.

Obrigado.

Mário

....

#======= iptables =======#

#!/bin/sh

#

# Startup script to implement /etc/sysconfig/iptables pre-defined rules.

#

# chkconfig: 2345 03 92

#

# description: Automates a packet filtering firewall with iptables.

#

# by bero@redhat.com, based on the ipchains script:

# Script Author: Joshua Jensen <joshua@redhat.com>

# -- hacked up by gafton with help from notting

# modified by Anton Altaparmakov <aia21@cam.ac.uk>:

# modified by Nils Philippsen <nils@redhat.de>

#

# config: /etc/sysconfig/iptables

# Source 'em up

. /etc/init.d/functions

IPTABLES_CONFIG=/etc/sysconfig/iptables

if [ ! -x /sbin/iptables ]; then

exit 0

fi

KERNELMAJ=`uname -r | sed -e 's,\..*,,'`

KERNELMIN=`uname -r | sed -e 's,[^\.]*\.,,' -e 's,\..*,,'`

if [ "$KERNELMAJ" -lt 2 ] ; then

exit 0

fi

if [ "$KERNELMAJ" -eq 2 -a "$KERNELMIN" -lt 3 ] ; then

exit 0

fi



if /sbin/lsmod 2>/dev/null |grep -q ipchains ; then

# Don't do both

exit 0

fi

iftable() {

if fgrep -qsx $1 /proc/net/ip_tables_names; then

iptables -t "$@"

fi

}

check() {

if [ -n "$1" ]; then

rm -f /lib/iptables

ln -s /lib/iptables.d/${1} /lib/iptables

iftable nat -N __T__${1##*-}__ >/dev/null 2>&1

iftable nat -A __T__${1##*-}__ -j MASQUERADE >/dev/null 2>&1

res=$?

iftable nat -F __T__${1##*-}__ >/dev/null 2>&1

iftable nat -X __T__${1##*-}__ >/dev/null 2>&1

return $res

else

/sbin/modprobe ipt_MASQUERADE >/dev/null 2>&1

kmajor=`uname -r`

kminor=${kmajor#*.}

kminor=${kminor%%.*}

kmajor=${kmajor%%.*}

for i in /lib/iptables.d/linux-$kmajor.$kminor-*; do

check ${i##*/} && break

done

/sbin/modprobe -r ipt_MASQUERADE >/dev/null 2>&1

fi

}

start() {

# don't do squat if we don't have the config file

if [ -f $IPTABLES_CONFIG ]; then

# We do _not_ need to flush/clear anything when using iptables-restore

gprintf "Applying iptables firewall rules: \n"

grep -v "^[[:space:]]*#" $IPTABLES_CONFIG | grep -v '^[[:space:]]*$' |
/sbin/iptables-restore -c && \

success "Applying iptables firewall rules" || \

failure "Applying iptables firewall rules"

echo

touch /var/lock/subsys/iptables

fi

}

stop() {

chains=`cat /proc/net/ip_tables_names 2>/dev/null`

for i in $chains; do iptables -t $i -F; done && \

success "Flushing all chains:" || \

failure "Flushing all chains:"

for i in $chains; do iptables -t $i -X; done && \

success "Removing user defined chains:" || \

failure "Removing user defined chains:"

gprintf "Resetting built-in chains to the default ACCEPT policy:"

iftable filter -P INPUT ACCEPT && \

iftable filter -P OUTPUT ACCEPT && \

iftable filter -P FORWARD ACCEPT && \

iftable nat -P PREROUTING ACCEPT && \

iftable nat -P POSTROUTING ACCEPT && \

iftable nat -P OUTPUT ACCEPT && \

iftable mangle -P PREROUTING ACCEPT && \

iftable mangle -P OUTPUT ACCEPT && \

success "Resetting built-in chains to the default ACCEPT policy" || \

failure "Resetting built-in chains to the default ACCEPT policy"

echo

rm -f /var/lock/subsys/iptables

}

case "$1" in

start)

check

start

;;

stop)

stop

;;

restart|reload)

# "restart" is really just "start" as this isn't a daemon,

# and "start" clears any pre-defined rules anyway.

# This is really only here to make those who expect it happy

start

;;

condrestart)

[ -e /var/lock/subsys/iptables ] && start

;;

status)

tables=`cat /proc/net/ip_tables_names 2>/dev/null`

for table in $tables; do

gprintf "Table: %s\n" "$table"

iptables -t $table --list

done

;;

panic)

gprintf "Changing target policies to DROP: "

iftable filter -P INPUT DROP && \

iftable filter -P FORWARD DROP && \

iftable filter -P OUTPUT DROP && \

iftable nat -P PREROUTING DROP && \

iftable nat -P POSTROUTING DROP && \

iftable nat -P OUTPUT DROP && \

iftable mangle -P PREROUTING DROP && \

iftable mangle -P OUTPUT DROP && \

success "Changing target policies to DROP" || \

failure "Changing target policies to DROP"

echo

iftable filter -F INPUT && \

iftable filter -F FORWARD && \

iftable filter -F OUTPUT && \

iftable nat -F PREROUTING && \

iftable nat -F POSTROUTING && \

iftable nat -F OUTPUT && \

iftable mangle -F PREROUTING && \

iftable mangle -F OUTPUT && \

success "Flushing all chains:" || \

failure "Flushing all chains:"

iftable filter -X INPUT && \

iftable filter -X FORWARD && \

iftable filter -X OUTPUT && \

iftable nat -X PREROUTING && \

iftable nat -X POSTROUTING && \

iftable nat -X OUTPUT && \

iftable mangle -X PREROUTING && \

iftable mangle -X OUTPUT && \

success "Removing user defined chains:" || \

failure "Removing user defined chains:"

;;

save)

gprintf "Saving current rules to %s: " "$IPTABLES_CONFIG"

touch $IPTABLES_CONFIG

chmod 600 $IPTABLES_CONFIG

/sbin/iptables-save -c > $IPTABLES_CONFIG 2>/dev/null && \

success "Saving current rules to %s" "$IPTABLES_CONFIG" || \

failure "Saving current rules to %s" "$IPTABLES_CONFIG"

echo

;;

check)

check

;;

*)

gprintf "Usage: %s
{start|stop|restart|condrestart|status|panic|save|check}\n" "$0"

exit 1

esac

exit 0

...