dns - Two external IPs one WebServer/Website -

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i'm having following dilemma, have website on iis 2 internal ips, each 1 of ips nated different external ips (each ip different isp). configured roundrobin dns service (two hosts same name different ip). traffic balanced between 2 isps, , that's want. thing apparently configuration (dns roundrobin) meant when have cluster of server each server has own isp on own nic, traffic webserver client made on isp.

right being told no matter our inbound traffic comes from, outbound traffic through our main wan, ok, because have tested when primary wan link down, website keeps working on secondary link.

ok, question is, think there may problem configuration? dns rounrobin useful on configuration?.

thanks lot feedback.

normally when host web service responses bigger compared inbound traffic (normally receive http get/ , deliver whole content back) - make more sense balance outbound traffic on isps value out of additional bandwidth.

does make sense - yes - can loose 1 isp , site still available (assuming healthchecks on dns server determine if sites available before send ip address - if deliver both ips when 1 isp down won't @ all)

it better add additional server - or policy based routing on single server - sending response out of interface received.

hope helps!


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