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router(config)#ip name-server 172.16.1.254 router(config)#ip name-server 172.16.2.254 router(config)#ip dhcp pool LAN router(dhcp-config)#dns-server 172.16.1.254 172.16.2.254 server# cat /etc/resolv.conf
search corpX.un nameserver 172.16.1.254 nameserver 172.16.2.254
ip access-list standard ACL_REDIRECT_ISP1 permit 192.168.X.0 0.0.0.255 ip access-list standard ACL_REDIRECT_ISP2 permit 192.168.100+X.0 0.0.0.255 ip nat inside source list ACL_REDIRECT_ISP1 interface FastEthernet1/1 overload ip nat inside source list ACL_REDIRECT_ISP2 interface FastEthernet0/0 overload route-map RM_REDIRECT_ISP permit 10 match ip address ACL_REDIRECT_ISP1 set ip next-hop 172.16.1.254 ! route-map RM_REDIRECT_ISP permit 20 match ip address ACL_REDIRECT_ISP2 set ip next-hop 172.16.2.254 interface FastEthernet1/0 description connetc to LAN ip address 192.168.X.1 255.255.255.0 ip nat inside ip policy route-map RM_REDIRECT_ISP interface FastEthernet1/1 description connect to ISP1 ip address 172.16.1.X 255.255.255.0 ip nat outside interface FastEthernet0/0 description connect to ISP2 ip address 172.16.2.X 255.255.255.0 ip nat outside
server# cat isp1_isp2.cfg
no ip access-list standard ACL_REDIRECT_ISP1 no ip access-list standard ACL_REDIRECT_ISP2 ip access-list standard ACL_REDIRECT_ISP1 permit 192.168.X.0 0.0.0.255 deny any ip access-list standard ACL_REDIRECT_ISP2 permit 192.168.100+X.0 0.0.0.255 deny any end
server# cat isp1.cfg
no ip access-list standard ACL_REDIRECT_ISP1 no ip access-list standard ACL_REDIRECT_ISP2 ip access-list standard ACL_REDIRECT_ISP1 permit 192.168.X.0 0.0.0.255 permit 192.168.100+X.0 0.0.0.255 ip access-list standard ACL_REDIRECT_ISP2 deny any end
server# cat isp2.cfg
no ip access-list standard ACL_REDIRECT_ISP1 no ip access-list standard ACL_REDIRECT_ISP2 ip access-list standard ACL_REDIRECT_ISP1 deny any ip access-list standard ACL_REDIRECT_ISP2 permit 192.168.X.0 0.0.0.255 permit 192.168.100+X.0 0.0.0.255 end
server# rsh router "clear ip nat tr *" server# rcp isp1.cfg router:running-config server# rcp isp2.cfg router:running-config server# rcp isp1_isp2.cfg router:running-config
server# cat route_isp1.cfg
no ip route 0.0.0.0 0.0.0.0 172.16.2.254 ip route 0.0.0.0 0.0.0.0 172.16.1.254 end
server# cat route_isp2.cfg
no ip route 0.0.0.0 0.0.0.0 172.16.1.254 ip route 0.0.0.0 0.0.0.0 172.16.2.254 end
server# rcp route_isp1.cfg router:running-config server# rsh router ping ya.ru server# rcp route_isp2.cfg router:running-config server# rsh router ping ya.ru
server# cat select_isp.sh
#!/bin/sh touch /tmp/conf_name rcp /root/route_isp1.cfg router:running-config rsh router ping ya.ru | grep -q '!' ALIVE1=$? rcp /root/route_isp2.cfg router:running-config rsh router ping ya.ru | grep -q '!' ALIVE2=$? test $ALIVE1 -eq 0 && conf_name="isp1.cfg" test $ALIVE2 -eq 0 && conf_name="isp2.cfg" test $ALIVE1 -eq 0 && test $ALIVE2 -eq 0 && conf_name="isp1_isp2.cfg" # echo /root/$conf_name # exit 0 test $conf_name = "`cat /tmp/conf_name`" && exit 0 echo $conf_name > /tmp/conf_name rsh router "clear ip nat tr *" rcp /root/$conf_name router:running-config exit 0
server# crontab -e */5 * * * * /root/select_isp.sh