LARTC - Aug 2004 - Second isp failure with dual internet connection

Below is a snippet from my firewall script
   isp1_ip="xx.0.5.20"
   isp1_gw="xx.0.5.1"
   isp1_net="xx.0.5.0/28"
   isp1_if="eth2"

   isp2_ip="xx.182.19.88"
   isp2_gw="xx.182.19.1"
   isp2_net="xx.182.19.0/28"
   isp2_if="eth3"

   lo_ip="127.0.0.1"
   lo_if="lo"
   lo_net="127.0.0.1/8"

   ip rule delete from $isp1_ip
   ip rule delete from $isp2_ip
   ip route delete table 5 # isp 1
   ip route delete table 7 # isp 2
   ip route del default via $isp2_gw dev $isp2_if
   ip route flush cache
   #ip route default nexthop via $isp2_gw nexthop $isp1_gw
   #ip route add default nexthop via $isp2_gw dev $isp2_if weight 2\
   #    nexthop via $isp1_gw dev $isp1_if weight 1

   echo "Adding routes ..."
   ip route add $isp1_net dev $isp1_if src $isp1_ip table 5
   ip route add default via $isp1_gw table 5
   #ip route add $lan_net dev $lan_if table 5
   #ip route add $isp2_net dev $isp2_if table 5
   #ip route add $lo_net dev $lo_if table 5

   ip route add $isp1_net dev $isp1_if src $isp1_ip
   ip route add $isp2_net dev $isp2_if src $isp2_ip
   ip rule add from $isp1_ip table 5
   ip rule add from $isp2_ip table 7

   ip route add $isp2_net dev $isp2_if src $isp2_ip table 7
   ip route add default via $isp2_gw table 7
   ip route add $lan_net dev $lan_if table 7
   ip route add $isp1_net dev $isp1_if table 7
   ip route add $lo_net dev $lo_if table 7

   ip route add default scope global nexthop via $isp2_gw dev $isp2_if  \
       weight 200 nexthop via $isp1_gw dev $isp1_if weight 1
   ip route flush cache
   echo "Starting firewall ..."

mail/http connections to $isp1_ip fails. Why is this?
I want to be able to connect to both ISP and fail over to ISP1 when ISP2 is
down.

Thanks


Gareth Segree
mailto:Gareth.Segree@gleanerjm.com <mailto:Gareth.Segree@gleanerjm.com> 
Technical Support Analyst
The Gleaner Company Ltd.
7 North Street
Kingston
Tel: 922-3400