Why dhclient doesn't send discovery signal ?

nima.m

Let say you have the following network :

pfsense (Type DHCP On WAN) –> ADSL Modem --> ISP Provider (DHCP Server)

Now, when you bootup pfsense, it request a IP number from ISP Provider and configure gateway/DNS,etc..
my ISP provider tell pfsense that DHCP lease should expire after 1800 second

Let say, ten minutes later, my ISP Provider go down and stay down for 5 hour, then goes up again.
During those 5 hour, Why dhcpclient inside pfsense doesn't send a discovery signal for getting new information from ISP provider ?

In DD-WRT, it begin sending discovery signal after 1800 second and continue to do it until it get response from DHCP
server.

nima.m

I end up writing my first script for pfsense, it's a watchdog script that monitor diffrent IP number and restart WAN interface if it dosn't detect any connection,
I have copy this to /usr/local/etc/rc.d


#!/bin/sh
. /etc/rc.subr

# ftp.sunet.se www.bredband.net
host="194.71.11.70 195.54.106.226"

case "$1" in
start)
	logger "Starting Watchdog Services."
	while sleep 600
	do
		#--- First Ping
		success="no"
		for ip in $host
		do
			if ping -c 1 -t 2 $ip >/dev/null
			then
				success="yes"
				logger "Watchdog Services: HeartBeat Signal From $ip Has Been Detected."
				break
			fi
		done
		#--- Second Ping
		if [ "$success" = "no" ]
		then
			logger "Watchdog Services: No HeartBeat Signal From $host Has Been Detected, Trying Again In 60 Second."
			sleep 60
			success="no"
			for ip in $host
			do
				if ping -c 1 -t 2 $ip >/dev/null
				then
					success="yes"
					logger "Watchdog Services: HeartBeat Signal From $ip Has Been Detected."
					break
				fi
			done
			if [ "$success" = "no" ]
			then
				logger "Watchdog Services: No HeartBeat Signal From $host Has Been Detected, Reseting WAN Interface."
				sleep 2
				/etc/rc.interfaces_wan_configure
			fi
		fi
	done
  exit 0
  ;;
stop)
	logger "Stopping Watchdog Services"
	kill `ps ax | grep watchdog | grep -v grep | awk '{ print $1 }'` 
        ;;
*)
	echo "Watchdog Services"
	echo "Created By Nima Mortazavi"
	echo
	echo "Monitoring IP Address $host every 10 Minutes And Reset WAN Interface If No Signal Is Detected."
	echo "Usage: `basename $0` {start|stop}" >&2
	exit 64
        ;;
esac

Guest

i keep getting diconnected so i tried that script of yours and it works like a charm,

still irritating to getting diconnected from irc,ssh sessions on so forth every once in a while..hope there will be some proper fix out soon

/F

cmb

@fredde:

still irritating to getting diconnected from irc,ssh sessions on so forth every once in a while..hope there will be some proper fix out soon

use keepalive in your SSH client. every stateful firewall should disconnect unused SSH sessions after their state table timeout period. Keepalives keeps the connection up. as for IRC, I don't know.