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Uplink balancing and DNS

eclipse79oldacct
Today I setup uplink balancing, and I discovered a "nice" surprice. I have 2 DSL lines and both my ISP prohibit the use of their DNS server to ips that does not belongs to their network. So first DSL can use its own dns server, second DSL can use its own dns server. Obviously I can put all dns servers in Dns forwarder list, but I suppose that this can cause some slowness in performing dns queries.

What do you think about this scenario? 

Thanks
eclipse79


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  • 0 in reply to techuser
    Hi eclipse 
    I had the same issue, I did as Bob suggested. and it working fine.
    I have two rules 

    any dns (ISP1 DNS servers) byinterface ext1
    any dns (ISP2 DNS servers) byinterface ext2


    I wonder, what happens, if one of the uplink fails ? Multipath normally should do a failover of the rules to the next available interface, which *may* cause DNS problems in this setting.

    But I didn't test the behaviour myself, so it's only an assumption.

    If anyone can test this, please post your findings.

    However: That's the reason, why I recommend to use availability group containing interface bound host objects for the DNS servers, which should avoid such issues in a failover scenario (IF they happen...).