[EMAIL PROTECTED] wrote: >>>>> I trying to setup multi-isp configuration (using latest bering-uClibc >>>>> 3.1-beta1), and began reading the corresponding doc: >>>>> http://www.shorewall.net/3.0/MultiISP.html >>>>> I am not clear on how the DNS resolution happens if a DNS request >>>>> from one provider goes to the other provider's name server. ISPs >>>>> these days serve their customers alone and reject all requests >>>>> outside their network. >>>>> >>>>> 1. As part of multi-isp setup, is it possible to have the DNS requests >>>>> routed thru' a provider go to provider's DNS IPs? >>>>> >>>>> 2. Does listing all ISP's DNS IPs into /etc/resolve.conf help? >>>>> >>>>> Appreciate any pointers or links. >>>> DNS is not a special case -- it obeys the same rules as any other >>>> connection. >>>> >>>> -Tom >>> Thanks for a prompt response Tom. >>> >>> DNS not being special case does make sense. Do you have any suggestions >>> on how to deal with the DNS look up failures when the requests are sent >>> to wrong provider. >> What does "request are sent to wrong provider" mean? >> >> -Tom > > Let me give you an example: > isp1: DNS 1.2.3.4, 2.3.4.5 > isp2: DNS 3.4.5.6, 4.5.6.7 > > Assume that we list all the above in /etc/resolv.conf file. When you > start the very first time, if using multi-isp, the request for DNS > resolution could go to either of the two ISPs. Assume that the request > goes to isp2 but the DNS server picked for resolution is 1.2.3.4. > This scenario is what I am referring to as 'wrong provider' (DNS > resolution point of view). >
You might consider route_rules that route 1.2.3.4 and 2.3.4.5 out of isp1 and 3.4.5.6 and 4.5.6.7 out of isp2..... -Tom -- Tom Eastep \ Nothing is foolproof to a sufficiently talented fool Shoreline, \ http://shorewall.net Washington USA \ [EMAIL PROTECTED] PGP Public Key \ https://lists.shorewall.net/teastep.pgp.key
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