Script Muito simples para monitorar links

Para que nao esta afim de instalar aplicações de monitoramento, mas precisa de uma solução para monitorar links, foi o meu caso quando escrevi o script abaixo:

#!/bin/sh

# links a serem monitorados
link="10.0.0.1 172.16.0.1 192.168.0.1"
# diretorio do log
logPath="/var/log"
# prefixo do nome do arquivo
logFileName="linkState.log"

# O apontamento final do arquivo. Ex.: /var/log/linkState.log.Monday
logFile="${logPath}/${logFileName}.`date '+%A'`"
# apaga o arquivo se a ultima alteração for anterior a 6 dias - ROTATE -
find ${logPath} -name "${logFileName}.*" -mtime +6d -delete

# Marka que foi feita a checagem neste horario
echo "--== MARK ==-- $link - `date`" >> $logFile

# percore a lista de links
for l in $link ; do
# testa link
ping -c 1 -q -o $l >> /dev/null || {
# Reporta problema caso exista
echo "LINK DOWN $l : `date`" >> $logFile
}
done;

# evita injection
exit 0;

IMCP Tipos e codigos

ICMP Types and Codes
TYPE	CODE	Description	Query	Error
0	0	Echo Reply	x
3	0	Network Unreachable		x
3	1	Host Unreachable		x
3	2	Protocol Unreachable		x
3	3	Port Unreachable		x
3	4	Fragmentation needed but no frag. bit set		x
3	5	Source routing failed		x
3	6	Destination network unknown		x
3	7	Destination host unknown		x
3	8	Source host isolated (obsolete)		x
3	9	Destination network administratively prohibited		x
3	10	Destination host administratively prohibited		x
3	11	Network unreachable for TOS		x
3	12	Host unreachable for TOS		x
3	13	Communication administratively prohibited by filtering		x
3	14	Host precedence violation		x
3	15	Precedence cutoff in effect		x
4	0	Source quench
5	0	Redirect for network
5	1	Redirect for host
5	2	Redirect for TOS and network
5	3	Redirect for TOS and host
8	0	Echo request	x
9	0	Router advertisement
10	0	Route solicitation
11	0	TTL equals 0 during transit		x
11	1	TTL equals 0 during reassembly		x
12	0	IP header bad (catchall error)		x
12	1	Required options missing		x
13	0	Timestamp request (obsolete)	x
14		Timestamp reply (obsolete)	x
15	0	Information request (obsolete)	x
16	0	Information reply (obsolete)	x
17	0	Address mask request	x
18	0	Address mask reply	x