My first idea is that having the default route point just to the physical interface is not a good thing to do. There are multiple problems starting with the fact that doing this requires that the next hop device support proxy arp. And the trend is increasingly that organizations are disabling proxy arp because of the security implications. Beyond that is the problem that it requires your router to arp for every remote destination. And to maintain the ARP table with all of the arp responses, which increases your memory consumption and the CPU processing of the router to do all of the arp processing.
There are also complications of how to do NAT when you have two active Internet connections.
And if you are using both a fiber connection and an ADSL connection you are trying to balance with a higher speed and a lower speed connection and there are issues with this.
ip route 0.0.0.0 0.0.0.0 x.x.x.x 150 ip route 0.0.0.0 0.0.0.0 y.y.y.y track 1
interface FastEthernet0/0 ip address x.x.x.x ip nat outside ip virtual-reassembly in duplex auto speed auto no cdp enable crypto map SDM_CMAP_1
interface FastEthernet0/1 no ip address ip mtu 1492 ip nat outside ip virtual-reassembly in duplex auto speed auto pppoe enable group global pppoe-client dial-pool-number 1
interface Dialer1 ip address negotiated ip mtu 1492 ip nat outside ip virtual-reassembly in encapsulation ppp dialer pool 1 dialer-group 1 ppp authentication chap pap callin ppp chap hostname ............... ppp chap password 7 010109085702121F33434A0014524343 ppp pap sent-username .......... password 7 0614002D40471D091718160201537E7A no cdp enable crypto map SDM_CMAP_1
track timer interface 5
track 1 ip sla 1 reachability delay down 15 up 10
ip sla 1 icmp-echo a.b.c.d source-interface y.y.y.y timeout 5000 threshold 40 frequency 6000 ip sla schedule 1 life forever start-time now
And I want to achive the following results:
All computers from LAN use for internet connection y.y.y.y and if this failed use x.x.x.x and when come back y.y.y.y use this connection.
And I have one server with few services ( DNS, WWW, MAIL...) which must use just x.x.x.x connection if this failed dosen't matter if this services not working.
But with this configuration one thing not working i can't access from outside Mail server , DNS, WWW with x.x.x.x connection ( IP ) if I change default route like :
ip route 0.0.0.0 0.0.0.0 x.x.x.x track 1 ip route 0.0.0.0 0.0.0.0 y.y.y.y 150
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