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Add details on DNS resolution on a different subnet #2503

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Add details on DNS resolution on a different subnet #2503

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14 changes: 14 additions & 0 deletions README.rst
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Expand Up @@ -223,6 +223,20 @@ DNS lookup
``ARP process`` below for the DNS server.
* If the DNS server is on a different subnet, the network library follows
the ``ARP process`` below for the default gateway IP.
* In the case where the DNS server has to be accessed on a different subnet,
the DNS query may be sent to the ISP's DNS server. If that domain's IP is not
cached on the ISP's DNS server, the query will be forwarded to a recursive
DNS resolver.
* The DNS resolver first checks its cache for the domain IP address. If not
present, it queries the root DNS nameserver.
* The root DNS nameserver will provide the TLD nameservers for that domain.
Root nameserver does not hold IP addresses for any domains.
* The resolver moves to query the provided TLD nameservers. The TLD nameserver
provides the authoritative nameservers for that domain.
* The resolver queries the authoritative nameserver, which resolves the domain
name to its IP address.
* The resolver caches the IP address for future DNS lookups and sends resolved
IP address back.


ARP process
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