james
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- Oct 18, 2007
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I just implemented this at home and Thought I would share it. I have a dynamic IP so nat can be a pain in the but. There are other solutions this is how I roll
The Script! "sipupdate" is modified from the asterisk contrib dir for my bidding:
The crontab via crontab -e:
At the appropriate location in sip.conf
sip_extip.conf only has localnet and extip it is up to you for all other nat settings..
Hope someone finds this useful...
The Script! "sipupdate" is modified from the asterisk contrib dir for my bidding:
Code:
#!/bin/sh
# sip_nat_settings: generate NAT settings for sip.conf of an Asterisk system
# that is behind a NAT router.
#
# This is a script to generate sane defaults for externip and localnet
# of sip.conf. The output should be included in the [general] section of
# sip.conf .
#
# Multiple network interfaces: If you have multiple network interfaces,
# this script will generate a 'localnet' line for each of them that has a
# broadcast (ipv4) address, except the loopback interface (lo). You can
# later rem-out all of those you don't need.
#
# Alternatively, provide a network interface as a parameter an a localnet
# line will only be generated for its network.
#
# Copyright (C) 2005 by Tzafrir Cohen <[email protected]>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
WGET=`which wget`
if [ -x ${WGET} ]; then
externip=`${WGET} -q -O- http://www.whatismyip.org`
elif [ -x ${FETCH} ]; then
externip=`${FETCH} -q -o - http://www.whatismyip.org`
else
echo "no binary found to contact http://www.whatismyip.org"
exit 1
fi
# optional parameter: network interface to use. By default: none.
IFACE="$1"
;;
esac
OS=`uname -s`
case "$OS" in
Linux)
# echo "externip = $externip"
# /sbin/ifconfig $IFACE | grep 'inet addr:' | grep Bcast \
# | sed -e 's/^.*Bcast:\([0-9.]*\)\s*Mask:\([0-9.]*\)\s*$/localnet = \1\/\2/'
localnet=$(/sbin/ifconfig $IFACE | grep 'inet addr:' | grep Bcast \
| sed -e 's/^.*Bcast:\([0-9.]*\)\s*Mask:\([0-9.]*\)\s*$/\1\/\2/')
echo "$localnet $externip"
;;
OpenBSD|FreeBSD)
if [ "${OS}" = "FreeBSD" ]; then
VER=`uname -r | cut -d . -f 1`
if [ ${VER} -lt 7 ]; then
echo "Unsupported OS"
exit 1
fi
fi
ip=`/sbin/ifconfig $IFACE | awk '/\tinet .* broadcast/{print $6}'`
x=`/sbin/ifconfig $IFACE | awk '/\tinet .* broadcast/{print $4}'`
if [ -x ${WGET} ]; then
externip=`${WGET} -q -O- http://www.whatismyip.org`
elif [ -x ${FETCH} ]; then
externip=`${FETCH} -q -o - http://www.whatismyip.org`
else
echo "no binary found to contact http://www.whatismyip.org"
exit 1
fi
# optional parameter: network interface to use. By default: none.
IFACE="$1"
OS=`uname -s`
case "$OS" in
Linux)
# echo "externip = $externip"
# /sbin/ifconfig $IFACE | grep 'inet addr:' | grep Bcast \
# | sed -e 's/^.*Bcast:\([0-9.]*\)\s*Mask:\([0-9.]*\)\s*$/localnet = \1\/\2/'
localnet=$(/sbin/ifconfig $IFACE | grep 'inet addr:' | grep Bcast \
| sed -e 's/^.*Bcast:\([0-9.]*\)\s*Mask:\([0-9.]*\)\s*$/\1\/\2/')
echo "$localnet $externip"
;;
OpenBSD|FreeBSD)
if [ "${OS}" = "FreeBSD" ]; then
VER=`uname -r | cut -d . -f 1`
if [ ${VER} -lt 7 ]; then
echo "Unsupported OS"
exit 1
fi
fi
ip=`/sbin/ifconfig $IFACE | awk '/\tinet .* broadcast/{print $6}'`
x=`/sbin/ifconfig $IFACE | awk '/\tinet .* broadcast/{print $4}'`
printf 'localnet = %s/%u.%u.%u.%u\n' $ip $(($x>>24&0xff)) $(($x>>16&0xff)) $(($x>>8&0xff)) $(($x&0xff))
;;
*)
echo >&2 "$0: Unsupported OS $OS"
exit 1
;;
esac
LastIP=$(cat /tmp/lastIP)
if [ "$LastIP" != "$externip" ]; then
echo "externip = $externip" > /etc/asterisk/sip_extip.conf
echo "localnet = $localnet" >> /etc/asterisk/sip_extip.conf
asterisk -rx "sip reload"
echo $externip > /tmp/lastIP
fi
Code:
59 * * * * /root/sipupdate
Code:
#include sip_extip.confHope someone finds this useful...
Phone System 